Add Terraform modules for CoreDNS, Cilium, and flannel

* With the new component system, these components can be managed
independent from the cluster and rolled or edited in advanced
ways
This commit is contained in:
Dalton Hubble 2024-05-19 16:53:47 -07:00
parent 533ace7011
commit 7b8a51070f
24 changed files with 1513 additions and 2 deletions

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@ -8,9 +8,10 @@ Notable changes between versions.
* Kubernetes [v1.30.1](https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.30.md#v1301)
* Add firewall rules and security group rules for Cilium and Hubble metrics ([#1449](https://github.com/poseidon/typhoon/pull/1449))
* Introduce `components` variabe to enable/disable/configure pre-installed components ([#1453](https://github.com/poseidon/typhoon/pull/1453))
* Update Cilium from v1.15.3 to [v1.15.5](https://github.com/cilium/cilium/releases/tag/v1.15.5)
* Update flannel from v0.24.4 to [v0.25.1](https://github.com/flannel-io/flannel/releases/tag/v0.25.1)
* Introduce `components` variabe to enable/disable/configure pre-installed components ([#1453](https://github.com/poseidon/typhoon/pull/1453))
* Add Terraform modules for `coredns`, `cilium`, and `flannel` components
### Azure

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@ -26,7 +26,7 @@ Typhoon distributes upstream Kubernetes, architectural conventions, and cluster
## Modules
Typhoon provides a Terraform Module for each supported operating system and platform.
Typhoon provides a Terraform Module for defining a Kubernetes cluster on each supported operating system and platform.
Typhoon is available for [Fedora CoreOS](https://getfedora.org/coreos/).
@ -57,6 +57,14 @@ Typhoon is available for [Flatcar Linux](https://www.flatcar-linux.org/releases/
| AWS | Flatcar Linux (ARM64) | [aws/flatcar-linux/kubernetes](aws/flatcar-linux/kubernetes) | alpha |
| Azure | Flatcar Linux (ARM64) | [azure/flatcar-linux/kubernetes](azure/flatcar-linux/kubernetes) | alpha |
Typhoon also provides Terraform Modules for optionally managing individual components applied onto clusters.
| Name | Terraform Module | Status |
|---------|------------------|--------|
| CoreDNS | [addons/coredns](addons/coredns) | beta |
| Cilium | [addons/cilium](addons/cilium) | beta |
| flannel | [addons/flannel](addons/flannel) | beta |
## Documentation
* [Docs](https://typhoon.psdn.io)

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@ -0,0 +1,36 @@
resource "kubernetes_cluster_role_binding" "operator" {
metadata {
name = "cilium-operator"
}
role_ref {
api_group = "rbac.authorization.k8s.io"
kind = "ClusterRole"
name = "cilium-operator"
}
subject {
kind = "ServiceAccount"
name = "cilium-operator"
namespace = "kube-system"
}
}
resource "kubernetes_cluster_role_binding" "agent" {
metadata {
name = "cilium-agent"
}
role_ref {
api_group = "rbac.authorization.k8s.io"
kind = "ClusterRole"
name = "cilium-agent"
}
subject {
kind = "ServiceAccount"
name = "cilium-agent"
namespace = "kube-system"
}
}

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@ -0,0 +1,112 @@
resource "kubernetes_cluster_role" "operator" {
metadata {
name = "cilium-operator"
}
# detect and restart [core|kube]dns pods on startup
rule {
verbs = ["get", "list", "watch", "delete"]
api_groups = [""]
resources = ["pods"]
}
rule {
verbs = ["list", "watch"]
api_groups = [""]
resources = ["nodes"]
}
rule {
verbs = ["patch"]
api_groups = [""]
resources = ["nodes", "nodes/status"]
}
rule {
verbs = ["get", "list", "watch"]
api_groups = ["discovery.k8s.io"]
resources = ["endpointslices"]
}
rule {
verbs = ["get", "list", "watch"]
api_groups = [""]
resources = ["services"]
}
# Perform LB IP allocation for BGP
rule {
verbs = ["update"]
api_groups = [""]
resources = ["services/status"]
}
# Perform the translation of a CNP that contains `ToGroup` to its endpoints
rule {
verbs = ["get", "list", "watch"]
api_groups = [""]
resources = ["services", "endpoints", "namespaces"]
}
rule {
verbs = ["*"]
api_groups = ["cilium.io"]
resources = ["ciliumnetworkpolicies", "ciliumnetworkpolicies/status", "ciliumnetworkpolicies/finalizers", "ciliumclusterwidenetworkpolicies", "ciliumclusterwidenetworkpolicies/status", "ciliumclusterwidenetworkpolicies/finalizers", "ciliumendpoints", "ciliumendpoints/status", "ciliumendpoints/finalizers", "ciliumnodes", "ciliumnodes/status", "ciliumnodes/finalizers", "ciliumidentities", "ciliumidentities/status", "ciliumidentities/finalizers", "ciliumlocalredirectpolicies", "ciliumlocalredirectpolicies/status", "ciliumlocalredirectpolicies/finalizers", "ciliumendpointslices", "ciliumloadbalancerippools", "ciliumloadbalancerippools/status", "ciliumcidrgroups", "ciliuml2announcementpolicies", "ciliuml2announcementpolicies/status", "ciliumpodippools"]
}
rule {
verbs = ["create", "get", "list", "update", "watch"]
api_groups = ["apiextensions.k8s.io"]
resources = ["customresourcedefinitions"]
}
# Cilium leader elects if among multiple operator replicas
rule {
verbs = ["create", "get", "update"]
api_groups = ["coordination.k8s.io"]
resources = ["leases"]
}
}
resource "kubernetes_cluster_role" "agent" {
metadata {
name = "cilium-agent"
}
rule {
verbs = ["get", "list", "watch"]
api_groups = ["networking.k8s.io"]
resources = ["networkpolicies"]
}
rule {
verbs = ["get", "list", "watch"]
api_groups = ["discovery.k8s.io"]
resources = ["endpointslices"]
}
rule {
verbs = ["get", "list", "watch"]
api_groups = [""]
resources = ["namespaces", "services", "pods", "endpoints", "nodes"]
}
rule {
verbs = ["patch"]
api_groups = [""]
resources = ["nodes/status"]
}
rule {
verbs = ["create", "get", "list", "watch", "update"]
api_groups = ["apiextensions.k8s.io"]
resources = ["customresourcedefinitions"]
}
rule {
verbs = ["*"]
api_groups = ["cilium.io"]
resources = ["ciliumnetworkpolicies", "ciliumnetworkpolicies/status", "ciliumclusterwidenetworkpolicies", "ciliumclusterwidenetworkpolicies/status", "ciliumendpoints", "ciliumendpoints/status", "ciliumnodes", "ciliumnodes/status", "ciliumidentities", "ciliumidentities/status", "ciliumlocalredirectpolicies", "ciliumlocalredirectpolicies/status", "ciliumegressnatpolicies", "ciliumendpointslices", "ciliumcidrgroups", "ciliuml2announcementpolicies", "ciliuml2announcementpolicies/status", "ciliumpodippools"]
}
}

196
addons/cilium/config.tf Normal file
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resource "kubernetes_config_map" "cilium" {
metadata {
name = "cilium"
namespace = "kube-system"
}
data = {
# Identity allocation mode selects how identities are shared between cilium
# nodes by setting how they are stored. The options are "crd" or "kvstore".
# - "crd" stores identities in kubernetes as CRDs (custom resource definition).
# These can be queried with:
# kubectl get ciliumid
# - "kvstore" stores identities in a kvstore, etcd or consul, that is
# configured below. Cilium versions before 1.6 supported only the kvstore
# backend. Upgrades from these older cilium versions should continue using
# the kvstore by commenting out the identity-allocation-mode below, or
# setting it to "kvstore".
identity-allocation-mode = "crd"
cilium-endpoint-gc-interval = "5m0s"
nodes-gc-interval = "5m0s"
# If you want to run cilium in debug mode change this value to true
debug = "false"
# The agent can be put into the following three policy enforcement modes
# default, always and never.
# https://docs.cilium.io/en/latest/policy/intro/#policy-enforcement-modes
enable-policy = "default"
# Prometheus
enable-metrics = "true"
prometheus-serve-addr = ":9962"
operator-prometheus-serve-addr = ":9963"
proxy-prometheus-port = "9964" # envoy
# Enable IPv4 addressing. If enabled, all endpoints are allocated an IPv4
# address.
enable-ipv4 = "true"
# Enable IPv6 addressing. If enabled, all endpoints are allocated an IPv6
# address.
enable-ipv6 = "false"
# Enable probing for a more efficient clock source for the BPF datapath
enable-bpf-clock-probe = "true"
# Enable use of transparent proxying mechanisms (Linux 5.7+)
enable-bpf-tproxy = "false"
# If you want cilium monitor to aggregate tracing for packets, set this level
# to "low", "medium", or "maximum". The higher the level, the less packets
# that will be seen in monitor output.
monitor-aggregation = "medium"
# The monitor aggregation interval governs the typical time between monitor
# notification events for each allowed connection.
#
# Only effective when monitor aggregation is set to "medium" or higher.
monitor-aggregation-interval = "5s"
# The monitor aggregation flags determine which TCP flags which, upon the
# first observation, cause monitor notifications to be generated.
#
# Only effective when monitor aggregation is set to "medium" or higher.
monitor-aggregation-flags = "all"
# Specifies the ratio (0.0-1.0) of total system memory to use for dynamic
# sizing of the TCP CT, non-TCP CT, NAT and policy BPF maps.
bpf-map-dynamic-size-ratio = "0.0025"
# bpf-policy-map-max specified the maximum number of entries in endpoint
# policy map (per endpoint)
bpf-policy-map-max = "16384"
# bpf-lb-map-max specifies the maximum number of entries in bpf lb service,
# backend and affinity maps.
bpf-lb-map-max = "65536"
# Pre-allocation of map entries allows per-packet latency to be reduced, at
# the expense of up-front memory allocation for the entries in the maps. The
# default value below will minimize memory usage in the default installation;
# users who are sensitive to latency may consider setting this to "true".
#
# This option was introduced in Cilium 1.4. Cilium 1.3 and earlier ignore
# this option and behave as though it is set to "true".
#
# If this value is modified, then during the next Cilium startup the restore
# of existing endpoints and tracking of ongoing connections may be disrupted.
# As a result, reply packets may be dropped and the load-balancing decisions
# for established connections may change.
#
# If this option is set to "false" during an upgrade from 1.3 or earlier to
# 1.4 or later, then it may cause one-time disruptions during the upgrade.
preallocate-bpf-maps = "false"
# Name of the cluster. Only relevant when building a mesh of clusters.
cluster-name = "default"
# Unique ID of the cluster. Must be unique across all conneted clusters and
# in the range of 1 and 255. Only relevant when building a mesh of clusters.
cluster-id = "0"
# Encapsulation mode for communication between nodes
# Possible values:
# - disabled
# - vxlan (default)
# - geneve
routing-mode = "tunnel"
tunnel = "vxlan"
# Enables L7 proxy for L7 policy enforcement and visibility
enable-l7-proxy = "true"
auto-direct-node-routes = "false"
# enableXTSocketFallback enables the fallback compatibility solution
# when the xt_socket kernel module is missing and it is needed for
# the datapath L7 redirection to work properly. See documentation
# for details on when this can be disabled:
# http://docs.cilium.io/en/latest/install/system_requirements/#admin-kernel-version.
enable-xt-socket-fallback = "true"
# installIptablesRules enables installation of iptables rules to allow for
# TPROXY (L7 proxy injection), itpables based masquerading and compatibility
# with kube-proxy. See documentation for details on when this can be
# disabled.
install-iptables-rules = "true"
# masquerade traffic leaving the node destined for outside
enable-ipv4-masquerade = "true"
enable-ipv6-masquerade = "false"
# bpfMasquerade enables masquerading with BPF instead of iptables
enable-bpf-masquerade = "true"
# kube-proxy
kube-proxy-replacement = "false"
kube-proxy-replacement-healthz-bind-address = ""
enable-session-affinity = "true"
# ClusterIPs from host namespace
bpf-lb-sock = "true"
# ClusterIPs from external nodes
bpf-lb-external-clusterip = "true"
# NodePort
enable-node-port = "true"
enable-health-check-nodeport = "false"
# ExternalIPs
enable-external-ips = "true"
# HostPort
enable-host-port = "true"
# IPAM
ipam = "cluster-pool"
disable-cnp-status-updates = "true"
cluster-pool-ipv4-cidr = "${var.pod_cidr}"
cluster-pool-ipv4-mask-size = "24"
# Health
agent-health-port = "9876"
enable-health-checking = "true"
enable-endpoint-health-checking = "true"
# Identity
enable-well-known-identities = "false"
enable-remote-node-identity = "true"
# Hubble server
enable-hubble = var.enable_hubble
hubble-disable-tls = "false"
hubble-listen-address = ":4244"
hubble-socket-path = "/var/run/cilium/hubble.sock"
hubble-tls-client-ca-files = "/var/lib/cilium/tls/hubble/client-ca.crt"
hubble-tls-cert-file = "/var/lib/cilium/tls/hubble/server.crt"
hubble-tls-key-file = "/var/lib/cilium/tls/hubble/server.key"
hubble-export-file-max-backups = "5"
hubble-export-file-max-size-mb = "10"
# Hubble metrics
hubble-metrics-server = ":9965"
hubble-metrics = "dns drop tcp flow port-distribution icmp httpV2"
enable-hubble-open-metrics = "false"
# Misc
enable-bandwidth-manager = "false"
enable-local-redirect-policy = "false"
policy-audit-mode = "false"
operator-api-serve-addr = "127.0.0.1:9234"
enable-l2-neigh-discovery = "true"
enable-k8s-terminating-endpoint = "true"
enable-k8s-networkpolicy = "true"
external-envoy-proxy = "false"
write-cni-conf-when-ready = "/host/etc/cni/net.d/05-cilium.conflist"
cni-exclusive = "true"
cni-log-file = "/var/run/cilium/cilium-cni.log"
}
}

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addons/cilium/daemonset.tf Normal file
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resource "kubernetes_daemonset" "cilium" {
wait_for_rollout = false
metadata {
name = "cilium"
namespace = "kube-system"
labels = {
k8s-app = "cilium"
}
}
spec {
strategy {
type = "RollingUpdate"
rolling_update {
max_unavailable = "1"
}
}
selector {
match_labels = {
k8s-app = "cilium-agent"
}
}
template {
metadata {
labels = {
k8s-app = "cilium-agent"
}
annotations = {
"prometheus.io/port" = "9962"
"prometheus.io/scrape" = "true"
}
}
spec {
host_network = true
priority_class_name = "system-node-critical"
service_account_name = "cilium-agent"
security_context {
seccomp_profile {
type = "RuntimeDefault"
}
}
toleration {
key = "node-role.kubernetes.io/controller"
operator = "Exists"
}
toleration {
key = "node.kubernetes.io/not-ready"
operator = "Exists"
}
dynamic "toleration" {
for_each = var.daemonset_tolerations
content {
key = toleration.value
operator = "Exists"
}
}
automount_service_account_token = true
enable_service_links = false
# Cilium v1.13.1 starts installing CNI plugins in yet another init container
# https://github.com/cilium/cilium/pull/24075
init_container {
name = "install-cni"
image = "quay.io/cilium/cilium:v1.15.5"
command = ["/install-plugin.sh"]
security_context {
allow_privilege_escalation = true
privileged = true
capabilities {
drop = ["ALL"]
}
}
volume_mount {
name = "cni-bin-dir"
mount_path = "/host/opt/cni/bin"
}
}
# Required to mount cgroup2 filesystem on the underlying Kubernetes node.
# We use nsenter command with host's cgroup and mount namespaces enabled.
init_container {
name = "mount-cgroup"
image = "quay.io/cilium/cilium:v1.15.5"
command = [
"sh",
"-ec",
# The statically linked Go program binary is invoked to avoid any
# dependency on utilities like sh and mount that can be missing on certain
# distros installed on the underlying host. Copy the binary to the
# same directory where we install cilium cni plugin so that exec permissions
# are available.
"cp /usr/bin/cilium-mount /hostbin/cilium-mount && nsenter --cgroup=/hostproc/1/ns/cgroup --mount=/hostproc/1/ns/mnt \"$${BIN_PATH}/cilium-mount\" $CGROUP_ROOT; rm /hostbin/cilium-mount"
]
env {
name = "CGROUP_ROOT"
value = "/run/cilium/cgroupv2"
}
env {
name = "BIN_PATH"
value = "/opt/cni/bin"
}
security_context {
allow_privilege_escalation = true
privileged = true
}
volume_mount {
name = "hostproc"
mount_path = "/hostproc"
}
volume_mount {
name = "cni-bin-dir"
mount_path = "/hostbin"
}
}
init_container {
name = "clean-cilium-state"
image = "quay.io/cilium/cilium:v1.15.5"
command = ["/init-container.sh"]
security_context {
allow_privilege_escalation = true
privileged = true
}
volume_mount {
name = "sys-fs-bpf"
mount_path = "/sys/fs/bpf"
}
volume_mount {
name = "var-run-cilium"
mount_path = "/var/run/cilium"
}
# Required to mount cgroup filesystem from the host to cilium agent pod
volume_mount {
name = "cilium-cgroup"
mount_path = "/run/cilium/cgroupv2"
mount_propagation = "HostToContainer"
}
}
container {
name = "cilium-agent"
image = "quay.io/cilium/cilium:v1.15.5"
command = ["cilium-agent"]
args = [
"--config-dir=/tmp/cilium/config-map"
]
env {
name = "K8S_NODE_NAME"
value_from {
field_ref {
api_version = "v1"
field_path = "spec.nodeName"
}
}
}
env {
name = "CILIUM_K8S_NAMESPACE"
value_from {
field_ref {
api_version = "v1"
field_path = "metadata.namespace"
}
}
}
env {
name = "KUBERNETES_SERVICE_HOST"
value_from {
config_map_key_ref {
name = "in-cluster"
key = "apiserver-host"
}
}
}
env {
name = "KUBERNETES_SERVICE_PORT"
value_from {
config_map_key_ref {
name = "in-cluster"
key = "apiserver-port"
}
}
}
port {
name = "peer-service"
protocol = "TCP"
container_port = 4244
}
# Metrics
port {
name = "metrics"
protocol = "TCP"
container_port = 9962
}
port {
name = "envoy-metrics"
protocol = "TCP"
container_port = 9964
}
port {
name = "hubble-metrics"
protocol = "TCP"
container_port = 9965
}
# Not yet used, prefer exec's
port {
name = "health"
protocol = "TCP"
container_port = 9876
}
lifecycle {
pre_stop {
exec {
command = ["/cni-uninstall.sh"]
}
}
}
security_context {
allow_privilege_escalation = true
privileged = true
}
liveness_probe {
exec {
command = ["cilium", "status", "--brief"]
}
initial_delay_seconds = 120
timeout_seconds = 5
period_seconds = 30
success_threshold = 1
failure_threshold = 10
}
readiness_probe {
exec {
command = ["cilium", "status", "--brief"]
}
initial_delay_seconds = 5
timeout_seconds = 5
period_seconds = 20
success_threshold = 1
failure_threshold = 3
}
# Load kernel modules
volume_mount {
name = "lib-modules"
read_only = true
mount_path = "/lib/modules"
}
# Access iptables concurrently
volume_mount {
name = "xtables-lock"
mount_path = "/run/xtables.lock"
}
# Keep state between restarts
volume_mount {
name = "var-run-cilium"
mount_path = "/var/run/cilium"
}
volume_mount {
name = "sys-fs-bpf"
mount_path = "/sys/fs/bpf"
mount_propagation = "Bidirectional"
}
# Configuration
volume_mount {
name = "config"
read_only = true
mount_path = "/tmp/cilium/config-map"
}
# Install config on host
volume_mount {
name = "cni-conf-dir"
mount_path = "/host/etc/cni/net.d"
}
# Hubble
volume_mount {
name = "hubble-tls"
mount_path = "/var/lib/cilium/tls/hubble"
read_only = true
}
}
termination_grace_period_seconds = 1
# Load kernel modules
volume {
name = "lib-modules"
host_path {
path = "/lib/modules"
}
}
# Access iptables concurrently with other processes (e.g. kube-proxy)
volume {
name = "xtables-lock"
host_path {
path = "/run/xtables.lock"
type = "FileOrCreate"
}
}
# Keep state between restarts
volume {
name = "var-run-cilium"
host_path {
path = "/var/run/cilium"
type = "DirectoryOrCreate"
}
}
# Keep state for bpf maps between restarts
volume {
name = "sys-fs-bpf"
host_path {
path = "/sys/fs/bpf"
type = "DirectoryOrCreate"
}
}
# Mount host cgroup2 filesystem
volume {
name = "hostproc"
host_path {
path = "/proc"
type = "Directory"
}
}
volume {
name = "cilium-cgroup"
host_path {
path = "/run/cilium/cgroupv2"
type = "DirectoryOrCreate"
}
}
# Read configuration
volume {
name = "config"
config_map {
name = "cilium"
}
}
# Install CNI plugin and config on host
volume {
name = "cni-bin-dir"
host_path {
path = "/opt/cni/bin"
type = "DirectoryOrCreate"
}
}
volume {
name = "cni-conf-dir"
host_path {
path = "/etc/cni/net.d"
type = "DirectoryOrCreate"
}
}
# Hubble TLS (optional)
volume {
name = "hubble-tls"
projected {
default_mode = "0400"
sources {
secret {
name = "hubble-server-certs"
optional = true
items {
key = "ca.crt"
path = "client-ca.crt"
}
items {
key = "tls.crt"
path = "server.crt"
}
items {
key = "tls.key"
path = "server.key"
}
}
}
}
}
}
}
}
}

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resource "kubernetes_deployment" "operator" {
wait_for_rollout = false
metadata {
name = "cilium-operator"
namespace = "kube-system"
}
spec {
replicas = 1
strategy {
type = "RollingUpdate"
rolling_update {
max_unavailable = "1"
}
}
selector {
match_labels = {
name = "cilium-operator"
}
}
template {
metadata {
labels = {
name = "cilium-operator"
}
annotations = {
"prometheus.io/scrape" = "true"
"prometheus.io/port" = "9963"
}
}
spec {
host_network = true
priority_class_name = "system-cluster-critical"
service_account_name = "cilium-operator"
security_context {
seccomp_profile {
type = "RuntimeDefault"
}
}
toleration {
key = "node-role.kubernetes.io/controller"
operator = "Exists"
}
toleration {
key = "node.kubernetes.io/not-ready"
operator = "Exists"
}
topology_spread_constraint {
max_skew = 1
topology_key = "kubernetes.io/hostname"
when_unsatisfiable = "DoNotSchedule"
label_selector {
match_labels = {
name = "cilium-operator"
}
}
}
automount_service_account_token = true
enable_service_links = false
container {
name = "cilium-operator"
image = "quay.io/cilium/operator-generic:v1.15.5"
command = ["cilium-operator-generic"]
args = [
"--config-dir=/tmp/cilium/config-map",
"--debug=$(CILIUM_DEBUG)"
]
env {
name = "K8S_NODE_NAME"
value_from {
field_ref {
api_version = "v1"
field_path = "spec.nodeName"
}
}
}
env {
name = "CILIUM_K8S_NAMESPACE"
value_from {
field_ref {
api_version = "v1"
field_path = "metadata.namespace"
}
}
}
env {
name = "KUBERNETES_SERVICE_HOST"
value_from {
config_map_key_ref {
name = "in-cluster"
key = "apiserver-host"
}
}
}
env {
name = "KUBERNETES_SERVICE_PORT"
value_from {
config_map_key_ref {
name = "in-cluster"
key = "apiserver-port"
}
}
}
env {
name = "CILIUM_DEBUG"
value_from {
config_map_key_ref {
name = "cilium"
key = "debug"
optional = true
}
}
}
port {
name = "metrics"
protocol = "TCP"
host_port = 9963
container_port = 9963
}
port {
name = "health"
container_port = 9234
protocol = "TCP"
}
liveness_probe {
http_get {
scheme = "HTTP"
host = "127.0.0.1"
port = "9234"
path = "/healthz"
}
initial_delay_seconds = 60
timeout_seconds = 3
period_seconds = 10
}
readiness_probe {
http_get {
scheme = "HTTP"
host = "127.0.0.1"
port = "9234"
path = "/healthz"
}
timeout_seconds = 3
period_seconds = 15
failure_threshold = 5
}
volume_mount {
name = "config"
read_only = true
mount_path = "/tmp/cilium/config-map"
}
}
volume {
name = "config"
config_map {
name = "cilium"
}
}
}
}
}
}

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resource "kubernetes_service_account" "operator" {
metadata {
name = "cilium-operator"
namespace = "kube-system"
}
automount_service_account_token = false
}
resource "kubernetes_service_account" "agent" {
metadata {
name = "cilium-agent"
namespace = "kube-system"
}
automount_service_account_token = false
}

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variable "pod_cidr" {
type = string
description = "CIDR IP range to assign Kubernetes pods"
default = "10.2.0.0/16"
}
variable "daemonset_tolerations" {
type = list(string)
description = "List of additional taint keys kube-system DaemonSets should tolerate (e.g. ['custom-role', 'gpu-role'])"
default = []
}
variable "enable_hubble" {
type = bool
description = "Run the embedded Hubble Server and mount hubble-server-certs Secret"
default = true
}

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terraform {
required_providers {
kubernetes = {
source = "hashicorp/kubernetes"
version = "~> 2.8"
}
}
}

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resource "kubernetes_cluster_role" "coredns" {
metadata {
name = "system:coredns"
}
rule {
api_groups = [""]
resources = [
"endpoints",
"services",
"pods",
"namespaces",
]
verbs = [
"list",
"watch",
]
}
rule {
api_groups = [""]
resources = [
"nodes",
]
verbs = [
"get",
]
}
rule {
api_groups = ["discovery.k8s.io"]
resources = [
"endpointslices",
]
verbs = [
"list",
"watch",
]
}
}

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addons/coredns/config.tf Normal file
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resource "kubernetes_config_map" "coredns" {
metadata {
name = "coredns"
namespace = "kube-system"
}
data = {
"Corefile" = <<-EOF
.:53 {
errors
health {
lameduck 5s
}
ready
log . {
class error
}
kubernetes ${var.cluster_domain_suffix} in-addr.arpa ip6.arpa {
pods insecure
fallthrough in-addr.arpa ip6.arpa
}
prometheus :9153
forward . /etc/resolv.conf
cache 30
loop
reload
loadbalance
}
EOF
}
}

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resource "kubernetes_deployment" "coredns" {
wait_for_rollout = false
metadata {
name = "coredns"
namespace = "kube-system"
labels = {
k8s-app = "coredns"
"kubernetes.io/name" = "CoreDNS"
}
}
spec {
replicas = var.replicas
strategy {
type = "RollingUpdate"
rolling_update {
max_unavailable = "1"
}
}
selector {
match_labels = {
k8s-app = "coredns"
tier = "control-plane"
}
}
template {
metadata {
labels = {
k8s-app = "coredns"
tier = "control-plane"
}
}
spec {
affinity {
node_affinity {
preferred_during_scheduling_ignored_during_execution {
weight = 100
preference {
match_expressions {
key = "node.kubernetes.io/controller"
operator = "Exists"
}
}
}
}
pod_anti_affinity {
preferred_during_scheduling_ignored_during_execution {
weight = 100
pod_affinity_term {
label_selector {
match_expressions {
key = "tier"
operator = "In"
values = ["control-plane"]
}
match_expressions {
key = "k8s-app"
operator = "In"
values = ["coredns"]
}
}
topology_key = "kubernetes.io/hostname"
}
}
}
}
dns_policy = "Default"
priority_class_name = "system-cluster-critical"
security_context {
seccomp_profile {
type = "RuntimeDefault"
}
}
service_account_name = "coredns"
toleration {
key = "node-role.kubernetes.io/controller"
effect = "NoSchedule"
}
container {
name = "coredns"
image = "registry.k8s.io/coredns/coredns:v1.11.1"
args = ["-conf", "/etc/coredns/Corefile"]
port {
name = "dns"
container_port = 53
protocol = "UDP"
}
port {
name = "dns-tcp"
container_port = 53
protocol = "TCP"
}
port {
name = "metrics"
container_port = 9153
protocol = "TCP"
}
resources {
requests = {
cpu = "100m"
memory = "70Mi"
}
limits = {
memory = "170Mi"
}
}
security_context {
capabilities {
add = ["NET_BIND_SERVICE"]
drop = ["all"]
}
read_only_root_filesystem = true
}
liveness_probe {
http_get {
path = "/health"
port = "8080"
scheme = "HTTP"
}
initial_delay_seconds = 60
timeout_seconds = 5
success_threshold = 1
failure_threshold = 5
}
readiness_probe {
http_get {
path = "/ready"
port = "8181"
scheme = "HTTP"
}
}
volume_mount {
name = "config"
mount_path = "/etc/coredns"
read_only = true
}
}
volume {
name = "config"
config_map {
name = "coredns"
items {
key = "Corefile"
path = "Corefile"
}
}
}
}
}
}
}

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resource "kubernetes_service_account" "coredns" {
metadata {
name = "coredns"
namespace = "kube-system"
}
automount_service_account_token = false
}
resource "kubernetes_cluster_role_binding" "coredns" {
metadata {
name = "system:coredns"
}
role_ref {
api_group = "rbac.authorization.k8s.io"
kind = "ClusterRole"
name = "system:coredns"
}
subject {
kind = "ServiceAccount"
name = "coredns"
namespace = "kube-system"
}
}

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addons/coredns/service.tf Normal file
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resource "kubernetes_service" "coredns" {
metadata {
name = "coredns"
namespace = "kube-system"
labels = {
"k8s-app" = "coredns"
"kubernetes.io/name" = "CoreDNS"
}
annotations = {
"prometheus.io/scrape" = "true"
"prometheus.io/port" = "9153"
}
}
spec {
type = "ClusterIP"
cluster_ip = var.cluster_dns_service_ip
selector = {
k8s-app = "coredns"
}
port {
name = "dns"
protocol = "UDP"
port = 53
}
port {
name = "dns-tcp"
protocol = "TCP"
port = 53
}
}
}

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variable "replicas" {
type = number
description = "CoreDNS replica count"
default = 2
}
variable "cluster_dns_service_ip" {
description = "Must be set to `cluster_dns_service_ip` output by cluster"
default = "10.3.0.10"
}
variable "cluster_domain_suffix" {
description = "Must be set to `cluster_domain_suffix` output by cluster"
default = "cluster.local"
}

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terraform {
required_providers {
kubernetes = {
source = "hashicorp/kubernetes"
version = "~> 2.8"
}
}
}

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resource "kubernetes_cluster_role_binding" "flannel" {
metadata {
name = "flannel"
}
role_ref {
api_group = "rbac.authorization.k8s.io"
kind = "ClusterRole"
name = "flannel"
}
subject {
kind = "ServiceAccount"
name = "flannel"
namespace = "kube-system"
}
}

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resource "kubernetes_cluster_role" "flannel" {
metadata {
name = "flannel"
}
rule {
api_groups = [""]
resources = ["pods"]
verbs = ["get"]
}
rule {
api_groups = [""]
resources = ["nodes"]
verbs = ["list", "watch"]
}
rule {
api_groups = [""]
resources = ["nodes/status"]
verbs = ["patch"]
}
}

44
addons/flannel/config.tf Normal file
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resource "kubernetes_config_map" "config" {
metadata {
name = "flannel-config"
namespace = "kube-system"
labels = {
k8s-app = "flannel"
tier = "node"
}
}
data = {
"cni-conf.json" = <<-EOF
{
"name": "cbr0",
"cniVersion": "0.3.1",
"plugins": [
{
"type": "flannel",
"delegate": {
"hairpinMode": true,
"isDefaultGateway": true
}
},
{
"type": "portmap",
"capabilities": {
"portMappings": true
}
}
]
}
EOF
"net-conf.json" = <<-EOF
{
"Network": "${var.pod_cidr}",
"Backend": {
"Type": "vxlan",
"Port": 4789
}
}
EOF
}
}

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addons/flannel/daemonset.tf Normal file
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resource "kubernetes_daemonset" "flannel" {
metadata {
name = "flannel"
namespace = "kube-system"
labels = {
k8s-app = "flannel"
}
}
spec {
strategy {
type = "RollingUpdate"
rolling_update {
max_unavailable = "1"
}
}
selector {
match_labels = {
k8s-app = "flannel"
}
}
template {
metadata {
labels = {
k8s-app = "flannel"
}
}
spec {
host_network = true
priority_class_name = "system-node-critical"
service_account_name = "flannel"
security_context {
seccomp_profile {
type = "RuntimeDefault"
}
}
toleration {
key = "node-role.kubernetes.io/controller"
operator = "Exists"
}
toleration {
key = "node.kubernetes.io/not-ready"
operator = "Exists"
}
dynamic "toleration" {
for_each = var.daemonset_tolerations
content {
key = toleration.value
operator = "Exists"
}
}
init_container {
name = "install-cni"
image = "quay.io/poseidon/flannel-cni:v0.4.2"
command = ["/install-cni.sh"]
env {
name = "CNI_NETWORK_CONFIG"
value_from {
config_map_key_ref {
name = "flannel-config"
key = "cni-conf.json"
}
}
}
volume_mount {
name = "cni-bin-dir"
mount_path = "/host/opt/cni/bin/"
}
volume_mount {
name = "cni-conf-dir"
mount_path = "/host/etc/cni/net.d"
}
}
container {
name = "flannel"
image = "docker.io/flannel/flannel:v0.25.1"
command = [
"/opt/bin/flanneld",
"--ip-masq",
"--kube-subnet-mgr",
"--iface=$(POD_IP)"
]
env {
name = "POD_NAME"
value_from {
field_ref {
field_path = "metadata.name"
}
}
}
env {
name = "POD_NAMESPACE"
value_from {
field_ref {
field_path = "metadata.namespace"
}
}
}
env {
name = "POD_IP"
value_from {
field_ref {
field_path = "status.podIP"
}
}
}
security_context {
privileged = true
}
resources {
requests = {
cpu = "100m"
}
}
volume_mount {
name = "flannel-config"
mount_path = "/etc/kube-flannel/"
}
volume_mount {
name = "run-flannel"
mount_path = "/run/flannel"
}
volume_mount {
name = "xtables-lock"
mount_path = "/run/xtables.lock"
}
}
volume {
name = "flannel-config"
config_map {
name = "flannel-config"
}
}
volume {
name = "run-flannel"
host_path {
path = "/run/flannel"
}
}
# Used by install-cni
volume {
name = "cni-bin-dir"
host_path {
path = "/opt/cni/bin"
}
}
volume {
name = "cni-conf-dir"
host_path {
path = "/etc/cni/net.d"
type = "DirectoryOrCreate"
}
}
# Acces iptables concurrently
volume {
name = "xtables-lock"
host_path {
path = "/run/xtables.lock"
type = "FileOrCreate"
}
}
}
}
}
}

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resource "kubernetes_service_account" "flannel" {
metadata {
name = "flannel"
namespace = "kube-system"
}
}

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variable "pod_cidr" {
type = string
description = "CIDR IP range to assign Kubernetes pods"
default = "10.2.0.0/16"
}
variable "daemonset_tolerations" {
type = list(string)
description = "List of additional taint keys kube-system DaemonSets should tolerate (e.g. ['custom-role', 'gpu-role'])"
default = []
}

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terraform {
required_providers {
kubernetes = {
source = "hashicorp/kubernetes"
version = "~> 2.8"
}
}
}