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eole-redis
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Adding support for a second instance ! 

Redis cluster needs 6 hosts for work ... it's a lot.
To trick him each node can be Master and slave for another node.

;)
This commit is contained in:
Philippe Caseiro 2018-05-15 12:17:25 +02:00
parent 36b8982e25
commit 2031ec7d64
5 changed files with 1007 additions and 23 deletions
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3
creolefuncs/redis.py
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@ -6,3 +6,6 @@
# #
def add(num1, num2): def add(num1, num2):
return str(int(num1) + int(num2)).decode("utf-8") return str(int(num1) + int(num2)).decode("utf-8")
def intAdd(num1, num2):
return int(num1) + int(num2)

135
dicos/90_redis.xml
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@ -3,11 +3,15 @@
<files> <files>
<!-- System configuration --> <!-- System configuration -->
<file filelist='redis' name='/etc/redis/redis.conf' mkdir='True' rm='True'/> <file filelist='redis' name='/etc/redis/redis.conf' mkdir='True' rm='True'/>
<file filelist='redisSlave' name='/etc/redis/redis-slave.conf' mkdir='True' rm='True'/>
<file filelist='redisCl' name='/etc/redis/cluster.conf' source='redis-cluster.conf' mkdir='True' rm='True'/> <file filelist='redisCl' name='/etc/redis/cluster.conf' source='redis-cluster.conf' mkdir='True' rm='True'/>
<service servicelist="svredis">redis-server</service> <service servicelist="svredis">redis-server</service>
<service servicelist="svredisSlave">redis2-server</service>
<service_access service='redis-server'> <service_access service='redis-server'>
<port service_accesslist='saRedis' protocol='tcp' port_type='SymLinkOption'>redisPort</port> <port service_accesslist='saRedis' protocol='tcp' port_type='SymLinkOption'>redisPort</port>
<port service_accesslist='saRedis' protocol='tcp' port_type='SymLinkOption'>redisClPort</port> <port service_accesslist='saRedis' protocol='tcp' port_type='SymLinkOption'>redisClPort</port>
<port service_accesslist='saRedisSlave' protocol='tcp' port_type='SymLinkOption'>redisPortSlave</port>
<port service_accesslist='saRedisSlave' protocol='tcp' port_type='SymLinkOption'>redisClPortSlave</port>
<tcpwrapper>redis-server</tcpwrapper> <tcpwrapper>redis-server</tcpwrapper>
</service_access> </service_access>
<service_restriction service='redis-server'> <service_restriction service='redis-server'>
@ -24,10 +28,15 @@
<variable name='redisMode' type='string' description="Mode d'utilisation de Redis"> <variable name='redisMode' type='string' description="Mode d'utilisation de Redis">
<value>Local</value> <value>Local</value>
</variable> </variable>
<variable name='redisPort' type='string' description="Port d'écoute du service Redis"> <variable name='redisSlaveInstance' type='oui/non' description="Voulez-vous lancer une instance esclave Redis sur ce serveur ?">
<value>non</value>
</variable>
<!-- Instance Principale-->
<variable name='redisInstanceName' type='string' description="Nom de l'instance secondaire"/>
<variable name='redisPort' type='number' description="Port d'écoute du service Redis">
<value>6379</value> <value>6379</value>
</variable> </variable>
<variable name='redisClPort' type='string' description="Port d'écoute du service Cluster Redis"/> <variable name='redisClPort' type='number' description="Port d'écoute du service Cluster Redis"/>
<variable name='redisMaxMemory' type='number' description="Quantité de mémoire utilisable par Redis en Mo"> <variable name='redisMaxMemory' type='number' description="Quantité de mémoire utilisable par Redis en Mo">
<value>512</value> <value>512</value>
</variable> </variable>
@ -37,6 +46,23 @@
<variable name='redisTCPKeepAlive' type='number' description="Intervalle entre le dernier envoi de paquet TCP et la réponse ACK (en secondes)"> <variable name='redisTCPKeepAlive' type='number' description="Intervalle entre le dernier envoi de paquet TCP et la réponse ACK (en secondes)">
<value>60</value> <value>60</value>
</variable> </variable>
<!-- Instance Secondaire -->
<variable name='redisSlaveInstanceName' type='string' description="Nom de l'instance secondaire"/>
<variable name='redisSlaveInstanceMaster' type='string' description="Nom du noeud a répliquer sur l'instance secondaire"/>
<variable name='redisPortSlave' type='number' description="Port d'écoute du service Redis">
<value>6379</value>
</variable>
<variable name='redisClPortSlave' type='number' description="Port d'écoute du service Cluster Redis"/>
<variable name='redisMaxMemorySlave' type='number' description="Quantité de mémoire utilisable par Redis en Mo">
<value>512</value>
</variable>
<variable name='redisMemoryPolicySlave' type='string' description='Méthode de libération de mémoire lorsque la maximum est atteint '>
<value>noeviction</value>
</variable>
<variable name='redisTCPKeepAliveSlave' type='number' description="Intervalle entre le dernier envoi de paquet TCP et la réponse ACK (en secondes)">
<value>60</value>
</variable>
<!-- Autorisations d'accès -->
<variable name='rdClIP' type='ip' description="Adresse IP réseau autorisée a utiliser le service Redis" multi='True'/> <variable name='rdClIP' type='ip' description="Adresse IP réseau autorisée a utiliser le service Redis" multi='True'/>
<variable name='rdClmask' type='ip' description="Masque de sous réseau"/> <variable name='rdClmask' type='ip' description="Masque de sous réseau"/>
@ -46,11 +72,23 @@
</variable> </variable>
<variable name='rdClMember' type='string' description="Nom du noeud" multi='True'/> <variable name='rdClMember' type='string' description="Nom du noeud" multi='True'/>
<variable name='rdClMemberIP' type='ip' description="Adresse IP du noeud" multi='True'/> <variable name='rdClMemberIP' type='ip' description="Adresse IP du noeud" multi='True'/>
<variable name='rdClMemberPort' type='number' description="Port d'écoute du noeud" multi='True'/> <variable name='rdClMemberPort' type='number' description="Port d'écoute du noeud" multi='True'>
<value>6379</value>
</variable>
<variable name='rdClMemberRole' type='ip' description="Rôle du membre"/> <variable name='rdClMemberRole' type='ip' description="Rôle du membre"/>
<variable name='rdClMemberMaster' type='string' description="Noeud source des données pour ce membre"/> <variable name='rdClMemberMaster' type='string' description="Nom du neoud a répliquer sur ce membre"/>
<variable name='rdClMemberAsSlave' type='oui/non' description="Ce noeud dispose de 2 instances ?">
<value>non</value>
</variable>
<variable name='rdClMemberSlaveName' type='string' description="Nom de l'instance secondaire"/>
<variable name='rdClMemberSlaveIP' type='ip' description="IP de l'instance secondaire"/>
<variable name='rdClMemberSlavePort' type='number' description="Port de l'instance secondaire"/>
<variable name='rdClMemberSlaveRole' type='string' description="Rôle de l'instance secondaire" hidden='True'/>
<variable name='rdClMemberSlaveMaster' type='string' description="Noeud du noeud répliquer sur cette instance secondaire"/>
</family> </family>
<separators> <separators>
<separator name='redisInstanceName'>Instance Principale</separator>
<separator name='redisSlaveInstanceName'>Instance Secondaire</separator>
<separator name='rdClIP'>Autorisation d'accès au service Redis</separator> <separator name='rdClIP'>Autorisation d'accès au service Redis</separator>
<separator name='redisRole'>Grappe Redis</separator> <separator name='redisRole'>Grappe Redis</separator>
<separator name='rdClMemberIP'>Serveurs membres de la grappe Redis</separator> <separator name='rdClMemberIP'>Serveurs membres de la grappe Redis</separator>
@ -61,14 +99,40 @@
<param>non</param> <param>non</param>
<target type='filelist'>redis</target> <target type='filelist'>redis</target>
<target type='family'>Redis</target> <target type='family'>Redis</target>
<target type='service_accesslist'>saredis</target> <target type='service_accesslist'>saRedis</target>
<target type='service_accesslist'>saRedisSlave</target>
<target type='servicelist'>svredis</target> <target type='servicelist'>svredis</target>
</condition> </condition>
<condition name='disabled_if_in' source='redisSlaveInstance'>
<param>non</param>
<target type='filelist'>redisSlave</target>
<target type='servicelist'>svredisSlave</target>
<target type='service_accesslist'>saRedisSlave</target>
<target type='variable'>redisSlaveInstanceName</target>
<target type='variable'>redisSlaveInstanceMaster</target>
<target type='variable'>redisPortSlave</target>
<target type='variable'>redisClPortSlave</target>
<target type='variable'>redisMemoryPolicySlave</target>
<target type='variable'>redisTCPKeepAliveSlave</target>
<target type='variable'>redisMaxMemorySlave</target>
</condition>
<condition name='disabled_if_in' source='rdClMemberAsSlave'>
<param>non</param>
<target type='variable'>rdClMemberSlaveName</target>
<target type='variable'>rdClMemberSlaveIP</target>
<target type='variable'>rdClMemberSlavePort</target>
<target type='variable'>rdClMemberSlaveRole</target>
<target type='variable'>rdClMemberSlaveMaster</target>
</condition>
<condition name='disabled_if_in' source='redisMode'> <condition name='disabled_if_in' source='redisMode'>
<param>Local</param> <param>Local</param>
<target type='variable'>redisRole</target> <target type='variable'>redisRole</target>
<target type='variable'>redisSlaveInstance</target>
<target type='filelist'>redisCl</target> <target type='filelist'>redisCl</target>
<target type='variable'>redisClPort</target>
</condition> </condition>
<condition name='disabled_if_in' source='redisRole'> <condition name='disabled_if_in' source='redisRole'>
@ -79,6 +143,12 @@
<target type='variable'>rdClMemberPort</target> <target type='variable'>rdClMemberPort</target>
<target type='variable'>rdClMemberRole</target> <target type='variable'>rdClMemberRole</target>
<target type='variable'>rdClMemberMaster</target> <target type='variable'>rdClMemberMaster</target>
<target type='variable'>rdClMemberAsSlave</target>
<target type='variable'>rdClMemberSlaveName</target>
<target type='variable'>rdClMemberSlaveIP</target>
<target type='variable'>rdClMemberSlavePort</target>
<target type='variable'>rdClMemberSlaveRole</target>
<target type='variable'>rdClMemberSlaveMaster</target>
</condition> </condition>
<condition name='disabled_if_in' source='rdClMemberRole'> <condition name='disabled_if_in' source='rdClMemberRole'>
@ -95,6 +165,12 @@
<slave>rdClMemberPort</slave> <slave>rdClMemberPort</slave>
<slave>rdClMemberRole</slave> <slave>rdClMemberRole</slave>
<slave>rdClMemberMaster</slave> <slave>rdClMemberMaster</slave>
<slave>rdClMemberAsSlave</slave>
<slave>rdClMemberSlaveName</slave>
<slave>rdClMemberSlaveIP</slave>
<slave>rdClMemberSlavePort</slave>
<slave>rdClMemberSlaveRole</slave>
<slave>rdClMemberSlaveMaster</slave>
</group> </group>
<check name="valid_enum" target="redisRole"> <check name="valid_enum" target="redisRole">
<param>['Leader','Node']</param> <param>['Leader','Node']</param>
@ -108,10 +184,57 @@
<check name="valid_enum" target="redisMemoryPolicy"> <check name="valid_enum" target="redisMemoryPolicy">
<param>['noeviction', 'allkeys-lru','volatile-lru','volatile-random', 'allkeys-random','volatile-ttl']</param> <param>['noeviction', 'allkeys-lru','volatile-lru','volatile-random', 'allkeys-random','volatile-ttl']</param>
</check> </check>
<fill name='add' target='redisClPort'>
<fill name='concat' target="redisSlaveInstanceName">
<param type='eole' name='valeur1'>redisInstanceName</param>
<param name='valeur2'>Second</param>
</fill>
<fill name='concat' target="rdClMemberSlaveName">
<param type='eole' name='valeur1'>rdClMember</param>
<param name='valeur2'>Second</param>
</fill>
<fill name='calc_val' target="rdClMemberSlaveIP">
<param type='eole' name='valeur'>rdClMemberIP</param>
</fill>
<auto name='calc_val' target='rdClMemberSlaveRole'>
<param>slave</param>
</auto>
<fill name='intAdd' target='rdClMemberSlavePort'>
<param type='eole' name='num1'>rdClMemberPort</param>
<param name='num2'>2000</param>
</fill>
<fill name='calc_val' target='redisInstanceName'>
<param type='eole' name='valeur'>nom_machine</param>
</fill>
<fill name='intAdd' target='redisClPort'>
<param type='eole' name='num1'>redisPort</param> <param type='eole' name='num1'>redisPort</param>
<param name='num2'>10000</param> <param name='num2'>10000</param>
</fill> </fill>
<fill name='intAdd' target='redisPortSlave'>
<param type='eole' name='num1'>redisPort</param>
<param name='num2'>2000</param>
</fill>
<fill name='intAdd' target='redisClPortSlave'>
<param type='eole' name='num1'>redisPortSlave</param>
<param name='num2'>10000</param>
</fill>
<fill name='calc_val' target='redisMaxMemorySlave'>
<param type='eole' name='valeur'>redisMaxMemory</param>
</fill>
<fill name='calc_val' target='redisMemoryPolicySlave'>
<param type='eole' name='valeur'>redisMemoryPolicy</param>
</fill>
<fill name='calc_val' target='redisTCPKeepAliveSlave'>
<param type='eole' name='valeur'>redisTCPKeepAlive</param>
</fill>
</constraints> </constraints>
<help> <help>
<variable name='activer_redis'>Activer le service de cache Redis</variable> <variable name='activer_redis'>Activer le service de cache Redis</variable>

34
postservice/90-redis-init
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@ -52,8 +52,17 @@ function getNodeID()
else else
searchCmd="awk '/${3}:${4}@/ { print \$1 }'" searchCmd="awk '/${3}:${4}@/ { print \$1 }'"
fi fi
redisRun $1 $2 cluster nodes | eval ${searchCmd} result=$(redisRun $1 $2 cluster nodes | eval ${searchCmd})
return ${?} rcode=${?}
if [[ -z ${result} ]]
then
searchCmd="awk '/${3}:${4}@/ { print \$1 }'"
result=$(redisRun $1 $2 cluster nodes | eval ${searchCmd})
rcode=${?}
fi
echo ${result}
return ${rcode}
} }
function redisClusterForgetAll() function redisClusterForgetAll()
@ -112,10 +121,13 @@ declare -A PORTS
declare -A ROLES declare -A ROLES
declare -A MASTERS declare -A MASTERS
declare -A NIDS declare -A NIDS
declare LeaderIP
declare LeaderPort
index=0 index=0
while read line while read line
do do
[[ ${line} =~ ^# ]] && continue
line=${line//::/:none:} line=${line//::/:none:}
li=(${line//:/ }) li=(${line//:/ })
@ -124,7 +136,13 @@ do
port=${li[2]} port=${li[2]}
role=${li[3]} role=${li[3]}
master=${li[4]} master=${li[4]}
ntype=${li[5]}
if [[ ${ntype} == "Leader" ]]
then
LeaderIP=${ip}
LeaderPort=${port}
fi
NAMES+=(${name}) NAMES+=(${name})
IPADDRS+=([${name}]=${ip}) IPADDRS+=([${name}]=${ip})
PORTS+=([${name}]=${port}) PORTS+=([${name}]=${port})
@ -133,12 +151,12 @@ do
done < ${CONF} done < ${CONF}
# If the cluster is "ok" don't do anything # If the cluster is "ok" don't do anything
st=$(redisClusterIsOK ${IPADDRS["Leader"]} ${PORTS["Leader"]}) st=$(redisClusterIsOK ${LeaderIP} ${LeaderPort})
#[[ ${?} -eq 0 ]] && exit 0 #[[ ${?} -eq 0 ]] && exit 0
if [[ ${1} == "forget" ]] if [[ ${1} == "forget" ]]
then then
redisClusterForgetAll ${IPADDRS["Leader"]} ${PORTS["Leader"]} redisClusterForgetAll ${LeaderIP} ${LeaderPort}
exit ${?} exit ${?}
fi fi
@ -160,7 +178,7 @@ for node in ${NAMES[@]}
do do
try=3 try=3
scmd="awk '/${IPADDRS[$node]}:${PORTS[${node}]}/ {print \$8}'" scmd="awk '/${IPADDRS[$node]}:${PORTS[${node}]}/ {print \$8}'"
while [[ $(redisRun ${IPADDRS['Leader']} ${PORTS['Leader']} "cluster nodes" | eval ${scmd}) != "connected" ]] while [[ $(redisRun ${LeaderIP} ${LeaderPort} "cluster nodes" | eval ${scmd}) != "connected" ]]
do do
sleep 1 sleep 1
try=$((try-1)) try=$((try-1))
@ -196,7 +214,7 @@ echo " * Configuring replication."
NIDS+=() NIDS+=()
for node in ${NAMES[@]} for node in ${NAMES[@]}
do do
NIDS+=([${node}]=$(getNodeID ${IPADDRS["Leader"]} ${PORTS["Leader"]} ${IPADDRS[${node}]} ${PORTS[${node}]})) NIDS+=([${node}]=$(getNodeID ${LeaderIP} ${LeaderPort} ${IPADDRS[${node}]} ${PORTS[${node}]}))
done done
for node in ${NAMES[@]} for node in ${NAMES[@]}
@ -206,12 +224,12 @@ do
redisAddReplica ${IPADDRS[${node}]} ${PORTS[${node}]} ${NIDS[${MASTERS[${node}]}]} redisAddReplica ${IPADDRS[${node}]} ${PORTS[${node}]} ${NIDS[${MASTERS[${node}]}]}
done done
sleep 2 sleep 5
echo echo
echo "Cluster status :" echo "Cluster status :"
echo echo
redisRun ${IPADDRS["Leader"]} ${PORTS["Leader"]} cluster info redisRun ${LeaderIP} ${LeaderPort} cluster info
echo echo

12
tmpl/redis-cluster.conf
View File

@ -1,10 +1,16 @@
%if %%getVar('activer_redis','non') == 'oui' and %%getVar('redisRole','Node') == 'Leader' %if %%getVar('activer_redis','non') == 'oui' and %%getVar('redisRole','Node') == 'Leader'
Leader:%%adresse_ip_eth0:%%{redisPort}:master:: %%redisInstanceName:%%adresse_ip_eth0:%%{redisPort}:master::Leader:
%if %%getVar('redisSlaveInstance','non') == 'oui'
%%redisSlaveInstanceName:%%adresse_ip_eth0:%%{redisPortSlave}:slave:%%{redisSlaveInstanceMaster}:Node:
%end if
%for %%node in %%getVar('rdClMember',[]) %for %%node in %%getVar('rdClMember',[])
%if %%node.rdClMemberRole == 'master' %if %%node.rdClMemberRole == 'master'
%%{node}:%%{node.rdClMemberIP}:%%{node.rdClMemberPort}:%%{node.rdClMemberRole}:: %%{node}:%%{node.rdClMemberIP}:%%{node.rdClMemberPort}:%%{node.rdClMemberRole}::Node:
%else %else
%%{node}:%%{node.rdClMemberIP}:%%{node.rdClMemberPort}:%%{node.rdClMemberRole}:%%{node.rdClMemberMaster}: %%{node}:%%{node.rdClMemberIP}:%%{node.rdClMemberPort}:%%{node.rdClMemberRole}:%%{node.rdClMemberMaster}:Node:
%end if
%if %%node.rdClMemberAsSlave == 'oui'
%%{node.rdClMemberSlaveName}:%%{node.rdClMemberSlaveIP}:%%{node.rdClMemberSlavePort}:%%{node.rdClMemberSlaveRole}:%%{node.rdClMemberSlaveMaster}:Node:
%end if %end if
%end for %end for
%end if %end if

834
tmpl/redis-slave.conf Normal file
View File

@ -0,0 +1,834 @@
# Redis configuration file example.
#
# Note that in order to read the configuration file, Redis must be
# started with the file path as first argument:
#
# ./redis-server /path/to/redis.conf
# Note on units: when memory size is needed, it is possible to specify
# it in the usual form of 1k 5GB 4M and so forth:
#
# 1k => 1000 bytes
# 1kb => 1024 bytes
# 1m => 1000000 bytes
# 1mb => 1024*1024 bytes
# 1g => 1000000000 bytes
# 1gb => 1024*1024*1024 bytes
#
# units are case insensitive so 1GB 1Gb 1gB are all the same.
################################## INCLUDES ###################################
# Include one or more other config files here. This is useful if you
# have a standard template that goes to all Redis servers but also need
# to customize a few per-server settings. Include files can include
# other files, so use this wisely.
#
# Notice option "include" won't be rewritten by command "CONFIG REWRITE"
# from admin or Redis Sentinel. Since Redis always uses the last processed
# line as value of a configuration directive, you'd better put includes
# at the beginning of this file to avoid overwriting config change at runtime.
#
# If instead you are interested in using includes to override configuration
# options, it is better to use include as the last line.
#
# include /path/to/local.conf
# include /path/to/other.conf
################################## NETWORK #####################################
# By default, if no "bind" configuration directive is specified, Redis listens
# for connections from all the network interfaces available on the server.
# It is possible to listen to just one or multiple selected interfaces using
# the "bind" configuration directive, followed by one or more IP addresses.
#
# Examples:
#
# bind 192.168.1.100 10.0.0.1
# bind 127.0.0.1 ::1
#
# ~~~ WARNING ~~~ If the computer running Redis is directly exposed to the
# internet, binding to all the interfaces is dangerous and will expose the
# instance to everybody on the internet. So by default we uncomment the
# following bind directive, that will force Redis to listen only into
# the IPv4 lookback interface address (this means Redis will be able to
# accept connections only from clients running into the same computer it
# is running).
#
# IF YOU ARE SURE YOU WANT YOUR INSTANCE TO LISTEN TO ALL THE INTERFACES
# JUST COMMENT THE FOLLOWING LINE.
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bind 0.0.0.0
# Protected mode is a layer of security protection, in order to avoid that
# Redis instances left open on the internet are accessed and exploited.
#
# When protected mode is on and if:
#
# 1) The server is not binding explicitly to a set of addresses using the
# "bind" directive.
# 2) No password is configured.
#
# The server only accepts connections from clients connecting from the
# IPv4 and IPv6 loopback addresses 127.0.0.1 and ::1, and from Unix domain
# sockets.
#
# By default protected mode is enabled. You should disable it only if
# you are sure you want clients from other hosts to connect to Redis
# even if no authentication is configured, nor a specific set of interfaces
# are explicitly listed using the "bind" directive.
protected-mode no
# Accept connections on the specified port, default is 6379 (IANA #815344).
# If port 0 is specified Redis will not listen on a TCP socket.
port %%redisPortSlave
# TCP listen() backlog.
#
# In high requests-per-second environments you need an high backlog in order
# to avoid slow clients connections issues. Note that the Linux kernel
# will silently truncate it to the value of /proc/sys/net/core/somaxconn so
# make sure to raise both the value of somaxconn and tcp_max_syn_backlog
# in order to get the desired effect.
tcp-backlog 511
# Unix socket.
#
# Specify the path for the Unix socket that will be used to listen for
# incoming connections. There is no default, so Redis will not listen
# on a unix socket when not specified.
#
# unixsocket /var/run/redis/redis.sock
# unixsocketperm 700
# Close the connection after a client is idle for N seconds (0 to disable)
timeout 0
# TCP keepalive.
#
# If non-zero, use SO_KEEPALIVE to send TCP ACKs to clients in absence
# of communication. This is useful for two reasons:
#
# 1) Detect dead peers.
# 2) Take the connection alive from the point of view of network
# equipment in the middle.
#
# On Linux, the specified value (in seconds) is the period used to send ACKs.
# Note that to close the connection the double of the time is needed.
# On other kernels the period depends on the kernel configuration.
#
# A reasonable value for this option is 300 seconds, which is the new
# Redis default starting with Redis 3.2.1.
tcp-keepalive %%redisTCPKeepAliveSlave
################################# GENERAL #####################################
# By default Redis does not run as a daemon. Use 'yes' if you need it.
# Note that Redis will write a pid file in /var/run/redis.pid when daemonized.
daemonize yes
# If you run Redis from upstart or systemd, Redis can interact with your
# supervision tree. Options:
# supervised no - no supervision interaction
# supervised upstart - signal upstart by putting Redis into SIGSTOP mode
# supervised systemd - signal systemd by writing READY=1 to $NOTIFY_SOCKET
# supervised auto - detect upstart or systemd method based on
# UPSTART_JOB or NOTIFY_SOCKET environment variables
# Note: these supervision methods only signal "process is ready."
# They do not enable continuous liveness pings back to your supervisor.
supervised systemd
# If a pid file is specified, Redis writes it where specified at startup
# and removes it at exit.
#
# When the server runs non daemonized, no pid file is created if none is
# specified in the configuration. When the server is daemonized, the pid file
# is used even if not specified, defaulting to "/var/run/redis.pid".
#
# Creating a pid file is best effort: if Redis is not able to create it
# nothing bad happens, the server will start and run normally.
pidfile /var/run/redis/redis-server.pid
# Specify the server verbosity level.
# This can be one of:
# debug (a lot of information, useful for development/testing)
# verbose (many rarely useful info, but not a mess like the debug level)
# notice (moderately verbose, what you want in production probably)
# warning (only very important / critical messages are logged)
loglevel notice
# Specify the log file name. Also the empty string can be used to force
# Redis to log on the standard output. Note that if you use standard
# output for logging but daemonize, logs will be sent to /dev/null
logfile /var/log/redis/redis-server.log
# To enable logging to the system logger, just set 'syslog-enabled' to yes,
# and optionally update the other syslog parameters to suit your needs.
# syslog-enabled no
# Specify the syslog identity.
# syslog-ident redis
# Specify the syslog facility. Must be USER or between LOCAL0-LOCAL7.
# syslog-facility local0
# Set the number of databases. The default database is DB 0, you can select
# a different one on a per-connection basis using SELECT <dbid> where
# dbid is a number between 0 and 'databases'-1
databases 16
################################ SNAPSHOTTING ################################
#
# Save the DB on disk:
#
# save <seconds> <changes>
#
# Will save the DB if both the given number of seconds and the given
# number of write operations against the DB occurred.
#
# In the example below the behaviour will be to save:
# after 900 sec (15 min) if at least 1 key changed
# after 300 sec (5 min) if at least 10 keys changed
# after 60 sec if at least 10000 keys changed
#
# Note: you can disable saving completely by commenting out all "save" lines.
#
# It is also possible to remove all the previously configured save
# points by adding a save directive with a single empty string argument
# like in the following example:
#
# save ""
save 900 1
save 300 10
save 60 10000
# By default Redis will stop accepting writes if RDB snapshots are enabled
# (at least one save point) and the latest background save failed.
# This will make the user aware (in a hard way) that data is not persisting
# on disk properly, otherwise chances are that no one will notice and some
# disaster will happen.
#
# If the background saving process will start working again Redis will
# automatically allow writes again.
#
# However if you have setup your proper monitoring of the Redis server
# and persistence, you may want to disable this feature so that Redis will
# continue to work as usual even if there are problems with disk,
# permissions, and so forth.
stop-writes-on-bgsave-error yes
# Compress string objects using LZF when dump .rdb databases?
# For default that's set to 'yes' as it's almost always a win.
# If you want to save some CPU in the saving child set it to 'no' but
# the dataset will likely be bigger if you have compressible values or keys.
rdbcompression yes
# Since version 5 of RDB a CRC64 checksum is placed at the end of the file.
# This makes the format more resistant to corruption but there is a performance
# hit to pay (around 10%) when saving and loading RDB files, so you can disable it
# for maximum performances.
#
# RDB files created with checksum disabled have a checksum of zero that will
# tell the loading code to skip the check.
rdbchecksum yes
# The filename where to dump the DB
dbfilename dump.rdb
# The working directory.
#
# The DB will be written inside this directory, with the filename specified
# above using the 'dbfilename' configuration directive.
#
# The Append Only File will also be created inside this directory.
#
# Note that you must specify a directory here, not a file name.
dir /var/lib/redis
################################## SECURITY ###################################
# Require clients to issue AUTH <PASSWORD> before processing any other
# commands. This might be useful in environments in which you do not trust
# others with access to the host running redis-server.
#
# This should stay commented out for backward compatibility and because most
# people do not need auth (e.g. they run their own servers).
#
# Warning: since Redis is pretty fast an outside user can try up to
# 150k passwords per second against a good box. This means that you should
# use a very strong password otherwise it will be very easy to break.
#
#requirepass redisMasterPassword
# Command renaming.
#
# It is possible to change the name of dangerous commands in a shared
# environment. For instance the CONFIG command may be renamed into something
# hard to guess so that it will still be available for internal-use tools
# but not available for general clients.
#
# Example:
#
# rename-command CONFIG b840fc02d524045429941cc15f59e41cb7be6c52
#
# It is also possible to completely kill a command by renaming it into
# an empty string:
#
# rename-command CONFIG ""
#
# Please note that changing the name of commands that are logged into the
# AOF file or transmitted to slaves may cause problems.
################################### LIMITS ####################################
# Set the max number of connected clients at the same time. By default
# this limit is set to 10000 clients, however if the Redis server is not
# able to configure the process file limit to allow for the specified limit
# the max number of allowed clients is set to the current file limit
# minus 32 (as Redis reserves a few file descriptors for internal uses).
#
# Once the limit is reached Redis will close all the new connections sending
# an error 'max number of clients reached'.
#
# maxclients 10000
# Don't use more memory than the specified amount of bytes.
# When the memory limit is reached Redis will try to remove keys
# according to the eviction policy selected (see maxmemory-policy).
#
# If Redis can't remove keys according to the policy, or if the policy is
# set to 'noeviction', Redis will start to reply with errors to commands
# that would use more memory, like SET, LPUSH, and so on, and will continue
# to reply to read-only commands like GET.
#
# This option is usually useful when using Redis as an LRU cache, or to set
# a hard memory limit for an instance (using the 'noeviction' policy).
#
# WARNING: If you have slaves attached to an instance with maxmemory on,
# the size of the output buffers needed to feed the slaves are subtracted
# from the used memory count, so that network problems / resyncs will
# not trigger a loop where keys are evicted, and in turn the output
# buffer of slaves is full with DELs of keys evicted triggering the deletion
# of more keys, and so forth until the database is completely emptied.
#
# In short... if you have slaves attached it is suggested that you set a lower
# limit for maxmemory so that there is some free RAM on the system for slave
# output buffers (but this is not needed if the policy is 'noeviction').
#
maxmemory %{redisMaxMemory}mb
# MAXMEMORY POLICY: how Redis will select what to remove when maxmemory
# is reached. You can select among five behaviors:
#
# volatile-lru -> remove the key with an expire set using an LRU algorithm
# allkeys-lru -> remove any key according to the LRU algorithm
# volatile-random -> remove a random key with an expire set
# allkeys-random -> remove a random key, any key
# volatile-ttl -> remove the key with the nearest expire time (minor TTL)
# noeviction -> don't expire at all, just return an error on write operations
#
# Note: with any of the above policies, Redis will return an error on write
# operations, when there are no suitable keys for eviction.
#
# At the date of writing these commands are: set setnx setex append
# incr decr rpush lpush rpushx lpushx linsert lset rpoplpush sadd
# sinter sinterstore sunion sunionstore sdiff sdiffstore zadd zincrby
# zunionstore zinterstore hset hsetnx hmset hincrby incrby decrby
# getset mset msetnx exec sort
#
# The default is:
#
maxmemory-policy %%redisMemoryPolicySlave
# LRU and minimal TTL algorithms are not precise algorithms but approximated
# algorithms (in order to save memory), so you can tune it for speed or
# accuracy. For default Redis will check five keys and pick the one that was
# used less recently, you can change the sample size using the following
# configuration directive.
#
# The default of 5 produces good enough results. 10 Approximates very closely
# true LRU but costs a bit more CPU. 3 is very fast but not very accurate.
#
# maxmemory-samples 5
############################## APPEND ONLY MODE ###############################
# By default Redis asynchronously dumps the dataset on disk. This mode is
# good enough in many applications, but an issue with the Redis process or
# a power outage may result into a few minutes of writes lost (depending on
# the configured save points).
#
# The Append Only File is an alternative persistence mode that provides
# much better durability. For instance using the default data fsync policy
# (see later in the config file) Redis can lose just one second of writes in a
# dramatic event like a server power outage, or a single write if something
# wrong with the Redis process itself happens, but the operating system is
# still running correctly.
#
# AOF and RDB persistence can be enabled at the same time without problems.
# If the AOF is enabled on startup Redis will load the AOF, that is the file
# with the better durability guarantees.
#
# Please check http://redis.io/topics/persistence for more information.
appendonly yes
# The name of the append only file (default: "appendonly.aof")
appendfilename "appendonly.aof"
# The fsync() call tells the Operating System to actually write data on disk
# instead of waiting for more data in the output buffer. Some OS will really flush
# data on disk, some other OS will just try to do it ASAP.
#
# Redis supports three different modes:
#
# no: don't fsync, just let the OS flush the data when it wants. Faster.
# always: fsync after every write to the append only log. Slow, Safest.
# everysec: fsync only one time every second. Compromise.
#
# The default is "everysec", as that's usually the right compromise between
# speed and data safety. It's up to you to understand if you can relax this to
# "no" that will let the operating system flush the output buffer when
# it wants, for better performances (but if you can live with the idea of
# some data loss consider the default persistence mode that's snapshotting),
# or on the contrary, use "always" that's very slow but a bit safer than
# everysec.
#
# More details please check the following article:
# http://antirez.com/post/redis-persistence-demystified.html
#
# If unsure, use "everysec".
# appendfsync always
appendfsync everysec
# appendfsync no
# When the AOF fsync policy is set to always or everysec, and a background
# saving process (a background save or AOF log background rewriting) is
# performing a lot of I/O against the disk, in some Linux configurations
# Redis may block too long on the fsync() call. Note that there is no fix for
# this currently, as even performing fsync in a different thread will block
# our synchronous write(2) call.
#
# In order to mitigate this problem it's possible to use the following option
# that will prevent fsync() from being called in the main process while a
# BGSAVE or BGREWRITEAOF is in progress.
#
# This means that while another child is saving, the durability of Redis is
# the same as "appendfsync none". In practical terms, this means that it is
# possible to lose up to 30 seconds of log in the worst scenario (with the
# default Linux settings).
#
# If you have latency problems turn this to "yes". Otherwise leave it as
# "no" that is the safest pick from the point of view of durability.
no-appendfsync-on-rewrite no
# Automatic rewrite of the append only file.
# Redis is able to automatically rewrite the log file implicitly calling
# BGREWRITEAOF when the AOF log size grows by the specified percentage.
#
# This is how it works: Redis remembers the size of the AOF file after the
# latest rewrite (if no rewrite has happened since the restart, the size of
# the AOF at startup is used).
#
# This base size is compared to the current size. If the current size is
# bigger than the specified percentage, the rewrite is triggered. Also
# you need to specify a minimal size for the AOF file to be rewritten, this
# is useful to avoid rewriting the AOF file even if the percentage increase
# is reached but it is still pretty small.
#
# Specify a percentage of zero in order to disable the automatic AOF
# rewrite feature.
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb
# An AOF file may be found to be truncated at the end during the Redis
# startup process, when the AOF data gets loaded back into memory.
# This may happen when the system where Redis is running
# crashes, especially when an ext4 filesystem is mounted without the
# data=ordered option (however this can't happen when Redis itself
# crashes or aborts but the operating system still works correctly).
#
# Redis can either exit with an error when this happens, or load as much
# data as possible (the default now) and start if the AOF file is found
# to be truncated at the end. The following option controls this behavior.
#
# If aof-load-truncated is set to yes, a truncated AOF file is loaded and
# the Redis server starts emitting a log to inform the user of the event.
# Otherwise if the option is set to no, the server aborts with an error
# and refuses to start. When the option is set to no, the user requires
# to fix the AOF file using the "redis-check-aof" utility before to restart
# the server.
#
# Note that if the AOF file will be found to be corrupted in the middle
# the server will still exit with an error. This option only applies when
# Redis will try to read more data from the AOF file but not enough bytes
# will be found.
aof-load-truncated yes
################################ LUA SCRIPTING ###############################
# Max execution time of a Lua script in milliseconds.
#
# If the maximum execution time is reached Redis will log that a script is
# still in execution after the maximum allowed time and will start to
# reply to queries with an error.
#
# When a long running script exceeds the maximum execution time only the
# SCRIPT KILL and SHUTDOWN NOSAVE commands are available. The first can be
# used to stop a script that did not yet called write commands. The second
# is the only way to shut down the server in the case a write command was
# already issued by the script but the user doesn't want to wait for the natural
# termination of the script.
#
# Set it to 0 or a negative value for unlimited execution without warnings.
lua-time-limit 5000
################################ REDIS CLUSTER ###############################
#
# ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
# WARNING EXPERIMENTAL: Redis Cluster is considered to be stable code, however
# in order to mark it as "mature" we need to wait for a non trivial percentage
# of users to deploy it in production.
# ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
#
# Normal Redis instances can't be part of a Redis Cluster; only nodes that are
# started as cluster nodes can. In order to start a Redis instance as a
# cluster node enable the cluster support uncommenting the following:
#
cluster-enabled yes
# Every cluster node has a cluster configuration file. This file is not
# intended to be edited by hand. It is created and updated by Redis nodes.
# Every Redis Cluster node requires a different cluster configuration file.
# Make sure that instances running in the same system do not have
# overlapping cluster configuration file names.
#
cluster-config-file nodes-slave.conf
# Cluster node timeout is the amount of milliseconds a node must be unreachable
# for it to be considered in failure state.
# Most other internal time limits are multiple of the node timeout.
#
cluster-node-timeout 15000
# A slave of a failing master will avoid to start a failover if its data
# looks too old.
#
# There is no simple way for a slave to actually have a exact measure of
# its "data age", so the following two checks are performed:
#
# 1) If there are multiple slaves able to failover, they exchange messages
# in order to try to give an advantage to the slave with the best
# replication offset (more data from the master processed).
# Slaves will try to get their rank by offset, and apply to the start
# of the failover a delay proportional to their rank.
#
# 2) Every single slave computes the time of the last interaction with
# its master. This can be the last ping or command received (if the master
# is still in the "connected" state), or the time that elapsed since the
# disconnection with the master (if the replication link is currently down).
# If the last interaction is too old, the slave will not try to failover
# at all.
#
# The point "2" can be tuned by user. Specifically a slave will not perform
# the failover if, since the last interaction with the master, the time
# elapsed is greater than:
#
# (node-timeout * slave-validity-factor) + repl-ping-slave-period
#
# So for example if node-timeout is 30 seconds, and the slave-validity-factor
# is 10, and assuming a default repl-ping-slave-period of 10 seconds, the
# slave will not try to failover if it was not able to talk with the master
# for longer than 310 seconds.
#
# A large slave-validity-factor may allow slaves with too old data to failover
# a master, while a too small value may prevent the cluster from being able to
# elect a slave at all.
#
# For maximum availability, it is possible to set the slave-validity-factor
# to a value of 0, which means, that slaves will always try to failover the
# master regardless of the last time they interacted with the master.
# (However they'll always try to apply a delay proportional to their
# offset rank).
#
# Zero is the only value able to guarantee that when all the partitions heal
# the cluster will always be able to continue.
#
cluster-slave-validity-factor 10
# Cluster slaves are able to migrate to orphaned masters, that are masters
# that are left without working slaves. This improves the cluster ability
# to resist to failures as otherwise an orphaned master can't be failed over
# in case of failure if it has no working slaves.
#
# Slaves migrate to orphaned masters only if there are still at least a
# given number of other working slaves for their old master. This number
# is the "migration barrier". A migration barrier of 1 means that a slave
# will migrate only if there is at least 1 other working slave for its master
# and so forth. It usually reflects the number of slaves you want for every
# master in your cluster.
#
# Default is 1 (slaves migrate only if their masters remain with at least
# one slave). To disable migration just set it to a very large value.
# A value of 0 can be set but is useful only for debugging and dangerous
# in production.
#
cluster-migration-barrier 1
# By default Redis Cluster nodes stop accepting queries if they detect there
# is at least an hash slot uncovered (no available node is serving it).
# This way if the cluster is partially down (for example a range of hash slots
# are no longer covered) all the cluster becomes, eventually, unavailable.
# It automatically returns available as soon as all the slots are covered again.
#
# However sometimes you want the subset of the cluster which is working,
# to continue to accept queries for the part of the key space that is still
# covered. In order to do so, just set the cluster-require-full-coverage
# option to no.
#
cluster-require-full-coverage yes
# In order to setup your cluster make sure to read the documentation
# available at http://redis.io web site.
################################## SLOW LOG ###################################
# The Redis Slow Log is a system to log queries that exceeded a specified
# execution time. The execution time does not include the I/O operations
# like talking with the client, sending the reply and so forth,
# but just the time needed to actually execute the command (this is the only
# stage of command execution where the thread is blocked and can not serve
# other requests in the meantime).
#
# You can configure the slow log with two parameters: one tells Redis
# what is the execution time, in microseconds, to exceed in order for the
# command to get logged, and the other parameter is the length of the
# slow log. When a new command is logged the oldest one is removed from the
# queue of logged commands.
# The following time is expressed in microseconds, so 1000000 is equivalent
# to one second. Note that a negative number disables the slow log, while
# a value of zero forces the logging of every command.
slowlog-log-slower-than 10000
# There is no limit to this length. Just be aware that it will consume memory.
# You can reclaim memory used by the slow log with SLOWLOG RESET.
slowlog-max-len 128
################################ LATENCY MONITOR ##############################
# The Redis latency monitoring subsystem samples different operations
# at runtime in order to collect data related to possible sources of
# latency of a Redis instance.
#
# Via the LATENCY command this information is available to the user that can
# print graphs and obtain reports.
#
# The system only logs operations that were performed in a time equal or
# greater than the amount of milliseconds specified via the
# latency-monitor-threshold configuration directive. When its value is set
# to zero, the latency monitor is turned off.
#
# By default latency monitoring is disabled since it is mostly not needed
# if you don't have latency issues, and collecting data has a performance
# impact, that while very small, can be measured under big load. Latency
# monitoring can easily be enabled at runtime using the command
# "CONFIG SET latency-monitor-threshold <milliseconds>" if needed.
latency-monitor-threshold 0
############################# EVENT NOTIFICATION ##############################
# Redis can notify Pub/Sub clients about events happening in the key space.
# This feature is documented at http://redis.io/topics/notifications
#
# For instance if keyspace events notification is enabled, and a client
# performs a DEL operation on key "foo" stored in the Database 0, two
# messages will be published via Pub/Sub:
#
# PUBLISH __keyspace@0__:foo del
# PUBLISH __keyevent@0__:del foo
#
# It is possible to select the events that Redis will notify among a set
# of classes. Every class is identified by a single character:
#
# K Keyspace events, published with __keyspace@<db>__ prefix.
# E Keyevent events, published with __keyevent@<db>__ prefix.
# g Generic commands (non-type specific) like DEL, EXPIRE, RENAME, ...
# $ String commands
# l List commands
# s Set commands
# h Hash commands
# z Sorted set commands
# x Expired events (events generated every time a key expires)
# e Evicted events (events generated when a key is evicted for maxmemory)
# A Alias for g$lshzxe, so that the "AKE" string means all the events.
#
# The "notify-keyspace-events" takes as argument a string that is composed
# of zero or multiple characters. The empty string means that notifications
# are disabled.
#
# Example: to enable list and generic events, from the point of view of the
# event name, use:
#
# notify-keyspace-events Elg
#
# Example 2: to get the stream of the expired keys subscribing to channel
# name __keyevent@0__:expired use:
#
# notify-keyspace-events Ex
#
# By default all notifications are disabled because most users don't need
# this feature and the feature has some overhead. Note that if you don't
# specify at least one of K or E, no events will be delivered.
notify-keyspace-events ""
############################### ADVANCED CONFIG ###############################
# Hashes are encoded using a memory efficient data structure when they have a
# small number of entries, and the biggest entry does not exceed a given
# threshold. These thresholds can be configured using the following directives.
hash-max-ziplist-entries 512
hash-max-ziplist-value 64
# Lists are also encoded in a special way to save a lot of space.
# The number of entries allowed per internal list node can be specified
# as a fixed maximum size or a maximum number of elements.
# For a fixed maximum size, use -5 through -1, meaning:
# -5: max size: 64 Kb <-- not recommended for normal workloads
# -4: max size: 32 Kb <-- not recommended
# -3: max size: 16 Kb <-- probably not recommended
# -2: max size: 8 Kb <-- good
# -1: max size: 4 Kb <-- good
# Positive numbers mean store up to _exactly_ that number of elements
# per list node.
# The highest performing option is usually -2 (8 Kb size) or -1 (4 Kb size),
# but if your use case is unique, adjust the settings as necessary.
list-max-ziplist-size -2
# Lists may also be compressed.
# Compress depth is the number of quicklist ziplist nodes from *each* side of
# the list to *exclude* from compression. The head and tail of the list
# are always uncompressed for fast push/pop operations. Settings are:
# 0: disable all list compression
# 1: depth 1 means "don't start compressing until after 1 node into the list,
# going from either the head or tail"
# So: [head]->node->node->...->node->[tail]
# [head], [tail] will always be uncompressed; inner nodes will compress.
# 2: [head]->[next]->node->node->...->node->[prev]->[tail]
# 2 here means: don't compress head or head->next or tail->prev or tail,
# but compress all nodes between them.
# 3: [head]->[next]->[next]->node->node->...->node->[prev]->[prev]->[tail]
# etc.
list-compress-depth 0
# Sets have a special encoding in just one case: when a set is composed
# of just strings that happen to be integers in radix 10 in the range
# of 64 bit signed integers.
# The following configuration setting sets the limit in the size of the
# set in order to use this special memory saving encoding.
set-max-intset-entries 512
# Similarly to hashes and lists, sorted sets are also specially encoded in
# order to save a lot of space. This encoding is only used when the length and
# elements of a sorted set are below the following limits:
zset-max-ziplist-entries 128
zset-max-ziplist-value 64
# HyperLogLog sparse representation bytes limit. The limit includes the
# 16 bytes header. When an HyperLogLog using the sparse representation crosses
# this limit, it is converted into the dense representation.
#
# A value greater than 16000 is totally useless, since at that point the
# dense representation is more memory efficient.
#
# The suggested value is ~ 3000 in order to have the benefits of
# the space efficient encoding without slowing down too much PFADD,
# which is O(N) with the sparse encoding. The value can be raised to
# ~ 10000 when CPU is not a concern, but space is, and the data set is
# composed of many HyperLogLogs with cardinality in the 0 - 15000 range.
hll-sparse-max-bytes 3000
# Active rehashing uses 1 millisecond every 100 milliseconds of CPU time in
# order to help rehashing the main Redis hash table (the one mapping top-level
# keys to values). The hash table implementation Redis uses (see dict.c)
# performs a lazy rehashing: the more operation you run into a hash table
# that is rehashing, the more rehashing "steps" are performed, so if the
# server is idle the rehashing is never complete and some more memory is used
# by the hash table.
#
# The default is to use this millisecond 10 times every second in order to
# actively rehash the main dictionaries, freeing memory when possible.
#
# If unsure:
# use "activerehashing no" if you have hard latency requirements and it is
# not a good thing in your environment that Redis can reply from time to time
# to queries with 2 milliseconds delay.
#
# use "activerehashing yes" if you don't have such hard requirements but
# want to free memory asap when possible.
activerehashing yes
# The client output buffer limits can be used to force disconnection of clients
# that are not reading data from the server fast enough for some reason (a
# common reason is that a Pub/Sub client can't consume messages as fast as the
# publisher can produce them).
#
# The limit can be set differently for the three different classes of clients:
#
# normal -> normal clients including MONITOR clients
# slave -> slave clients
# pubsub -> clients subscribed to at least one pubsub channel or pattern
#
# The syntax of every client-output-buffer-limit directive is the following:
#
# client-output-buffer-limit <class> <hard limit> <soft limit> <soft seconds>
#
# A client is immediately disconnected once the hard limit is reached, or if
# the soft limit is reached and remains reached for the specified number of
# seconds (continuously).
# So for instance if the hard limit is 32 megabytes and the soft limit is
# 16 megabytes / 10 seconds, the client will get disconnected immediately
# if the size of the output buffers reach 32 megabytes, but will also get
# disconnected if the client reaches 16 megabytes and continuously overcomes
# the limit for 10 seconds.
#
# By default normal clients are not limited because they don't receive data
# without asking (in a push way), but just after a request, so only
# asynchronous clients may create a scenario where data is requested faster
# than it can read.
#
# Instead there is a default limit for pubsub and slave clients, since
# subscribers and slaves receive data in a push fashion.
#
# Both the hard or the soft limit can be disabled by setting them to zero.
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit slave 256mb 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60
# Redis calls an internal function to perform many background tasks, like
# closing connections of clients in timeout, purging expired keys that are
# never requested, and so forth.
#
# Not all tasks are performed with the same frequency, but Redis checks for
# tasks to perform according to the specified "hz" value.
#
# By default "hz" is set to 10. Raising the value will use more CPU when
# Redis is idle, but at the same time will make Redis more responsive when
# there are many keys expiring at the same time, and timeouts may be
# handled with more precision.
#
# The range is between 1 and 500, however a value over 100 is usually not
# a good idea. Most users should use the default of 10 and raise this up to
# 100 only in environments where very low latency is required.
hz 10
# When a child rewrites the AOF file, if the following option is enabled
# the file will be fsync-ed every 32 MB of data generated. This is useful
# in order to commit the file to the disk more incrementally and avoid
# big latency spikes.
aof-rewrite-incremental-fsync yes