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Migrate GCP, DO, Azure to static pod control plane

Browse Source 
* Run a kube-apiserver, kube-scheduler, and kube-controller-manager
static pod on each controller node. Previously, kube-apiserver was
self-hosted as a DaemonSet across controllers and kube-scheduler
and kube-controller-manager were a Deployment (with 2 or
controller_count many replicas).
* Remove bootkube bootstrap and pivot to self-hosted
* Remove pod-checkpointer manifests (no longer needed)
This commit is contained in:
Dalton Hubble 2019-09-05 23:12:09 -07:00
parent c933bdfc26
commit db947537d1
21 changed files with 235 additions and 199 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
README.md
View File

@ -97,16 +97,12 @@ kube-system calico-node-d1l5b 2/2 Running 0
kube-system calico-node-sp9ps 2/2 Running 0 6m
kube-system coredns-1187388186-zj5dl 1/1 Running 0 6m
kube-system coredns-1187388186-dkh3o 1/1 Running 0 6m
kube-system kube-apiserver-zppls 1/1 Running 0 6m
kube-system kube-controller-manager-3271970485-gh9kt 1/1 Running 0 6m
kube-system kube-controller-manager-3271970485-h90v8 1/1 Running 1 6m
kube-system kube-apiserver-controller-0 1/1 Running 0 6m
kube-system kube-controller-manager-controller-0 1/1 Running 0 6m
kube-system kube-proxy-117v6 1/1 Running 0 6m
kube-system kube-proxy-9886n 1/1 Running 0 6m
kube-system kube-proxy-njn47 1/1 Running 0 6m
kube-system kube-scheduler-3895335239-5x87r 1/1 Running 0 6m
kube-system kube-scheduler-3895335239-bzrrt 1/1 Running 1 6m
kube-system pod-checkpointer-l6lrt 1/1 Running 0 6m
kube-system pod-checkpointer-l6lrt-controller-0 1/1 Running 0 6m
kube-system kube-scheduler-controller-0 1/1 Running 0 6m
```
## Non-Goals

2
azure/container-linux/kubernetes/README.md
View File

@ -11,7 +11,7 @@ Typhoon distributes upstream Kubernetes, architectural conventions, and cluster
## Features <a href="https://www.cncf.io/certification/software-conformance/"><img align="right" src="https://storage.googleapis.com/poseidon/certified-kubernetes.png"></a>
* Kubernetes v1.15.3 (upstream, via [kubernetes-incubator/bootkube](https://github.com/kubernetes-incubator/bootkube))
* Kubernetes v1.15.3 (upstream)
* Single or multi-master, [Calico](https://www.projectcalico.org/) or [flannel](https://github.com/coreos/flannel) networking
* On-cluster etcd with TLS, [RBAC](https://kubernetes.io/docs/admin/authorization/rbac/)-enabled, [network policy](https://kubernetes.io/docs/concepts/services-networking/network-policies/)
* Advanced features like [worker pools](https://typhoon.psdn.io/advanced/worker-pools/), [low-priority](https://typhoon.psdn.io/cl/azure/#low-priority) workers, and [snippets](https://typhoon.psdn.io/advanced/customization/#container-linux) customization

2
azure/container-linux/kubernetes/bootkube.tf
View File

@ -1,6 +1,6 @@
# Self-hosted Kubernetes assets (kubeconfig, manifests)
module "bootkube" {
source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=98cc19f80f2c4c3ddc63fc7aea6320e74bec561a"
source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=6e59af71138bc5f784453873074de16e7ee150eb"
cluster_name = var.cluster_name
api_servers = [format("%s.%s", var.cluster_name, var.dns_zone)]

63
azure/container-linux/kubernetes/cl/controller.yaml.tmpl
View File

@ -96,17 +96,28 @@ systemd:
RestartSec=10
[Install]
WantedBy=multi-user.target
- name: bootkube.service
- name: bootstrap.service
contents: |
[Unit]
Description=Bootstrap a Kubernetes cluster
ConditionPathExists=!/opt/bootkube/init_bootkube.done
Description=Kubernetes control plane
ConditionPathExists=!/opt/bootstrap/bootstrap.done
[Service]
Type=oneshot
RemainAfterExit=true
WorkingDirectory=/opt/bootkube
ExecStart=/opt/bootkube/bootkube-start
ExecStartPost=/bin/touch /opt/bootkube/init_bootkube.done
WorkingDirectory=/opt/bootstrap
ExecStartPre=-/usr/bin/bash -c 'set -x && [ -n "$(ls /opt/bootstrap/assets/manifests-*/* 2>/dev/null)" ] && mv /opt/bootstrap/assets/manifests-*/* /opt/bootstrap/assets/manifests && rm -rf /opt/bootstrap/assets/manifests-*'
ExecStart=/usr/bin/rkt run \
--trust-keys-from-https \
--volume assets,kind=host,source=/opt/bootstrap/assets \
--mount volume=assets,target=/assets \
--volume script,kind=host,source=/opt/bootstrap/apply \
--mount volume=script,target=/apply \
--insecure-options=image \
docker://k8s.gcr.io/hyperkube:v1.15.3 \
--net=host \
--dns=host \
--exec=/apply
ExecStartPost=/bin/touch /opt/bootstrap/bootstrap.done
[Install]
WantedBy=multi-user.target
storage:
@ -124,36 +135,26 @@ storage:
inline: |
KUBELET_IMAGE_URL=docker://k8s.gcr.io/hyperkube
KUBELET_IMAGE_TAG=v1.15.3
- path: /opt/bootstrap/apply
filesystem: root
mode: 0544
contents:
inline: |
#!/bin/bash -e
export KUBECONFIG=/assets/auth/kubeconfig
until kubectl version; do
echo "Waiting for static pod control plane"
sleep 5
done
until kubectl apply -f /assets/manifests -R; do
echo "Retry applying manifests"
sleep 5
done
- path: /etc/sysctl.d/max-user-watches.conf
filesystem: root
contents:
inline: |
fs.inotify.max_user_watches=16184
- path: /opt/bootkube/bootkube-start
filesystem: root
mode: 0544
user:
id: 500
group:
id: 500
contents:
inline: |
#!/bin/bash
# Wrapper for bootkube start
set -e
# Move experimental manifests
[ -n "$(ls /opt/bootkube/assets/manifests-*/* 2>/dev/null)" ] && mv /opt/bootkube/assets/manifests-*/* /opt/bootkube/assets/manifests && rm -rf /opt/bootkube/assets/manifests-*
exec /usr/bin/rkt run \
--trust-keys-from-https \
--volume assets,kind=host,source=/opt/bootkube/assets \
--mount volume=assets,target=/assets \
--volume bootstrap,kind=host,source=/etc/kubernetes \
--mount volume=bootstrap,target=/etc/kubernetes \
$${RKT_OPTS} \
quay.io/coreos/bootkube:v0.14.0 \
--net=host \
--dns=host \
--exec=/bootkube -- start --asset-dir=/assets "$@"
passwd:
users:
- name: core

16
azure/container-linux/kubernetes/security.tf
View File

@ -53,6 +53,22 @@ resource "azurerm_network_security_rule" "controller-etcd-metrics" {
destination_address_prefix = azurerm_subnet.controller.address_prefix
}
# Allow Prometheus to scrape kube-scheduler and kube-controller-manager metrics
resource "azurerm_network_security_rule" "controller-kube-metrics" {
resource_group_name = azurerm_resource_group.cluster.name
name = "allow-kube-metrics"
network_security_group_name = azurerm_network_security_group.controller.name
priority = "2011"
access = "Allow"
direction = "Inbound"
protocol = "Tcp"
source_port_range = "*"
destination_port_range = "10251-10252"
source_address_prefix = azurerm_subnet.worker.address_prefix
destination_address_prefix = azurerm_subnet.controller.address_prefix
}
resource "azurerm_network_security_rule" "controller-apiserver" {
resource_group_name = azurerm_resource_group.cluster.name

35
azure/container-linux/kubernetes/ssh.tf
View File

@ -1,12 +1,15 @@
# Secure copy etcd TLS assets to controllers.
# Secure copy assets to controllers.
resource "null_resource" "copy-controller-secrets" {
count = var.controller_count
depends_on = [azurerm_virtual_machine.controllers]
depends_on = [
module.bootkube,
azurerm_virtual_machine.controllers
]
connection {
type = "ssh"
host = element(azurerm_public_ip.controllers.*.ip_address, count.index)
host = azurerm_public_ip.controllers.*.ip_address[count.index]
user = "core"
timeout = "15m"
}
@ -46,6 +49,11 @@ resource "null_resource" "copy-controller-secrets" {
destination = "$HOME/etcd-peer.key"
}
provisioner "file" {
source = var.asset_dir
destination = "$HOME/assets"
}
provisioner "remote-exec" {
inline = [
"sudo mkdir -p /etc/ssl/etcd/etcd",
@ -58,18 +66,21 @@ resource "null_resource" "copy-controller-secrets" {
"sudo mv etcd-peer.key /etc/ssl/etcd/etcd/peer.key",
"sudo chown -R etcd:etcd /etc/ssl/etcd",
"sudo chmod -R 500 /etc/ssl/etcd",
"sudo mv $HOME/assets /opt/bootstrap/assets",
"sudo mkdir -p /etc/kubernetes/bootstrap-secrets",
"sudo cp -r /opt/bootstrap/assets/tls/* /etc/kubernetes/bootstrap-secrets/",
"sudo cp /opt/bootstrap/assets/auth/kubeconfig /etc/kubernetes/bootstrap-secrets/",
"sudo cp -r /opt/bootstrap/assets/static-manifests/* /etc/kubernetes/manifests/",
]
}
}
# Secure copy bootkube assets to ONE controller and start bootkube to perform
# one-time self-hosted cluster bootstrapping.
resource "null_resource" "bootkube-start" {
# Connect to a controller to perform one-time cluster bootstrap.
resource "null_resource" "bootstrap" {
depends_on = [
module.bootkube,
null_resource.copy-controller-secrets,
module.workers,
azurerm_dns_a_record.apiserver,
null_resource.copy-controller-secrets,
]
connection {
@ -79,15 +90,9 @@ resource "null_resource" "bootkube-start" {
timeout = "15m"
}
provisioner "file" {
source = var.asset_dir
destination = "$HOME/assets"
}
provisioner "remote-exec" {
inline = [
"sudo mv $HOME/assets /opt/bootkube",
"sudo systemctl start bootkube",
"sudo systemctl start bootstrap",
]
}
}

2
bare-metal/container-linux/kubernetes/ssh.tf
View File

@ -99,7 +99,7 @@ resource "null_resource" "copy-worker-secrets" {
connection {
type = "ssh"
host = element(var.worker_domains, count.index)
host = var.worker_domains[count.index]
user = "core"
timeout = "60m"
}

2
digital-ocean/container-linux/kubernetes/README.md
View File

@ -11,7 +11,7 @@ Typhoon distributes upstream Kubernetes, architectural conventions, and cluster
## Features <a href="https://www.cncf.io/certification/software-conformance/"><img align="right" src="https://storage.googleapis.com/poseidon/certified-kubernetes.png"></a>
* Kubernetes v1.15.3 (upstream, via [kubernetes-incubator/bootkube](https://github.com/kubernetes-incubator/bootkube))
* Kubernetes v1.15.3 (upstream)
* Single or multi-master, [Calico](https://www.projectcalico.org/) or [flannel](https://github.com/coreos/flannel) networking
* On-cluster etcd with TLS, [RBAC](https://kubernetes.io/docs/admin/authorization/rbac/)-enabled, [network policy](https://kubernetes.io/docs/concepts/services-networking/network-policies/)
* Advanced features like [snippets](https://typhoon.psdn.io/advanced/customization/#container-linux) customization

2
digital-ocean/container-linux/kubernetes/bootkube.tf
View File

@ -1,6 +1,6 @@
# Self-hosted Kubernetes assets (kubeconfig, manifests)
module "bootkube" {
source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=98cc19f80f2c4c3ddc63fc7aea6320e74bec561a"
source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=6e59af71138bc5f784453873074de16e7ee150eb"
cluster_name = var.cluster_name
api_servers = [format("%s.%s", var.cluster_name, var.dns_zone)]

63
digital-ocean/container-linux/kubernetes/cl/controller.yaml.tmpl
View File

@ -108,17 +108,28 @@ systemd:
RestartSec=10
[Install]
WantedBy=multi-user.target
- name: bootkube.service
- name: bootstrap.service
contents: |
[Unit]
Description=Bootstrap a Kubernetes cluster
ConditionPathExists=!/opt/bootkube/init_bootkube.done
Description=Kubernetes control plane
ConditionPathExists=!/opt/bootstrap/bootstrap.done
[Service]
Type=oneshot
RemainAfterExit=true
WorkingDirectory=/opt/bootkube
ExecStart=/opt/bootkube/bootkube-start
ExecStartPost=/bin/touch /opt/bootkube/init_bootkube.done
WorkingDirectory=/opt/bootstrap
ExecStartPre=-/usr/bin/bash -c 'set -x && [ -n "$(ls /opt/bootstrap/assets/manifests-*/* 2>/dev/null)" ] && mv /opt/bootstrap/assets/manifests-*/* /opt/bootstrap/assets/manifests && rm -rf /opt/bootstrap/assets/manifests-*'
ExecStart=/usr/bin/rkt run \
--trust-keys-from-https \
--volume assets,kind=host,source=/opt/bootstrap/assets \
--mount volume=assets,target=/assets \
--volume script,kind=host,source=/opt/bootstrap/apply \
--mount volume=script,target=/apply \
--insecure-options=image \
docker://k8s.gcr.io/hyperkube:v1.15.3 \
--net=host \
--dns=host \
--exec=/apply
ExecStartPost=/bin/touch /opt/bootstrap/bootstrap.done
[Install]
WantedBy=multi-user.target
storage:
@ -130,33 +141,23 @@ storage:
inline: |
KUBELET_IMAGE_URL=docker://k8s.gcr.io/hyperkube
KUBELET_IMAGE_TAG=v1.15.3
- path: /opt/bootstrap/apply
filesystem: root
mode: 0544
contents:
inline: |
#!/bin/bash -e
export KUBECONFIG=/assets/auth/kubeconfig
until kubectl version; do
echo "Waiting for static pod control plane"
sleep 5
done
until kubectl apply -f /assets/manifests -R; do
echo "Retry applying manifests"
sleep 5
done
- path: /etc/sysctl.d/max-user-watches.conf
filesystem: root
contents:
inline: |
fs.inotify.max_user_watches=16184
- path: /opt/bootkube/bootkube-start
filesystem: root
mode: 0544
user:
id: 500
group:
id: 500
contents:
inline: |
#!/bin/bash
# Wrapper for bootkube start
set -e
# Move experimental manifests
[ -n "$(ls /opt/bootkube/assets/manifests-*/* 2>/dev/null)" ] && mv /opt/bootkube/assets/manifests-*/* /opt/bootkube/assets/manifests && rm -rf /opt/bootkube/assets/manifests-*
exec /usr/bin/rkt run \
--trust-keys-from-https \
--volume assets,kind=host,source=/opt/bootkube/assets \
--mount volume=assets,target=/assets \
--volume bootstrap,kind=host,source=/etc/kubernetes \
--mount volume=bootstrap,target=/etc/kubernetes \
$${RKT_OPTS} \
quay.io/coreos/bootkube:v0.14.0 \
--net=host \
--dns=host \
--exec=/bootkube -- start --asset-dir=/assets "$@"

11
digital-ocean/container-linux/kubernetes/network.tf
View File

@ -53,24 +53,33 @@ resource "digitalocean_firewall" "controllers" {
tags = ["${var.cluster_name}-controller"]
# etcd, kube-apiserver, kubelet
# etcd
inbound_rule {
protocol = "tcp"
port_range = "2379-2380"
source_tags = [digitalocean_tag.controllers.name]
}
# etcd metrics
inbound_rule {
protocol = "tcp"
port_range = "2381"
source_tags = [digitalocean_tag.workers.name]
}
# kube-apiserver
inbound_rule {
protocol = "tcp"
port_range = "6443"
source_addresses = ["0.0.0.0/0", "::/0"]
}
# kube-scheduler metrics, kube-controller-manager metrics
inbound_rule {
protocol = "tcp"
port_range = "10251-10252"
source_tags = [digitalocean_tag.workers.name]
}
}
resource "digitalocean_firewall" "workers" {

31
digital-ocean/container-linux/kubernetes/ssh.tf
View File

@ -1,14 +1,15 @@
# Secure copy etcd TLS assets and kubeconfig to controllers. Activates kubelet.service
# Secure copy assets to controllers. Activates kubelet.service
resource "null_resource" "copy-controller-secrets" {
count = var.controller_count
depends_on = [
module.bootkube,
digitalocean_firewall.rules
]
connection {
type = "ssh"
host = element(digitalocean_droplet.controllers.*.ipv4_address, count.index)
host = digitalocean_droplet.controllers.*.ipv4_address[count.index]
user = "core"
timeout = "15m"
}
@ -53,6 +54,11 @@ resource "null_resource" "copy-controller-secrets" {
destination = "$HOME/etcd-peer.key"
}
provisioner "file" {
source = var.asset_dir
destination = "$HOME/assets"
}
provisioner "remote-exec" {
inline = [
"sudo mkdir -p /etc/ssl/etcd/etcd",
@ -66,6 +72,11 @@ resource "null_resource" "copy-controller-secrets" {
"sudo chown -R etcd:etcd /etc/ssl/etcd",
"sudo chmod -R 500 /etc/ssl/etcd",
"sudo mv $HOME/kubeconfig /etc/kubernetes/kubeconfig",
"sudo mv $HOME/assets /opt/bootstrap/assets",
"sudo mkdir -p /etc/kubernetes/bootstrap-secrets",
"sudo cp -r /opt/bootstrap/assets/tls/* /etc/kubernetes/bootstrap-secrets/",
"sudo cp /opt/bootstrap/assets/auth/kubeconfig /etc/kubernetes/bootstrap-secrets/",
"sudo cp -r /opt/bootstrap/assets/static-manifests/* /etc/kubernetes/manifests/",
]
}
}
@ -76,7 +87,7 @@ resource "null_resource" "copy-worker-secrets" {
connection {
type = "ssh"
host = element(digitalocean_droplet.workers.*.ipv4_address, count.index)
host = digitalocean_droplet.workers.*.ipv4_address[count.index]
user = "core"
timeout = "15m"
}
@ -93,11 +104,9 @@ resource "null_resource" "copy-worker-secrets" {
}
}
# Secure copy bootkube assets to ONE controller and start bootkube to perform
# one-time self-hosted cluster bootstrapping.
resource "null_resource" "bootkube-start" {
# Connect to a controller to perform one-time cluster bootstrap.
resource "null_resource" "bootstrap" {
depends_on = [
module.bootkube,
null_resource.copy-controller-secrets,
null_resource.copy-worker-secrets,
]
@ -109,15 +118,9 @@ resource "null_resource" "bootkube-start" {
timeout = "15m"
}
provisioner "file" {
source = var.asset_dir
destination = "$HOME/assets"
}
provisioner "remote-exec" {
inline = [
"sudo mv $HOME/assets /opt/bootkube",
"sudo systemctl start bootkube",
"sudo systemctl start bootstrap",
]
}
}

22
docs/cl/azure.md
View File

@ -7,7 +7,7 @@ In this tutorial, we'll create a Kubernetes v1.15.3 cluster on Azure with Contai
We'll declare a Kubernetes cluster using the Typhoon Terraform module. Then apply the changes to create a resource group, virtual network, subnets, security groups, controller availability set, worker scale set, load balancer, and TLS assets.
Controllers are provisioned to run an `etcd-member` peer and a `kubelet` service. Workers run just a `kubelet` service. A one-time [bootkube](https://github.com/kubernetes-incubator/bootkube) bootstrap schedules the `apiserver`, `scheduler`, `controller-manager`, and `coredns` on controllers and schedules `kube-proxy` and `flannel` on every node. A generated `kubeconfig` provides `kubectl` access to the cluster.
Controller hosts are provisioned to run an `etcd-member` peer and a `kubelet` service. Worker hosts run a `kubelet` service. Controller nodes run `kube-apiserver`, `kube-scheduler`, `kube-controller-manager`, and `coredns`, while `kube-proxy` and `calico` (or `flannel`) run on every node. A generated `kubeconfig` provides `kubectl` access to the cluster.
## Requirements
@ -88,7 +88,7 @@ Reference the [variables docs](#variables) or the [variables.tf](https://github.
## ssh-agent
Initial bootstrapping requires `bootkube.service` be started on one controller node. Terraform uses `ssh-agent` to automate this step. Add your SSH private key to `ssh-agent`.
Initial bootstrapping requires `bootstrap.service` be started on one controller node. Terraform uses `ssh-agent` to automate this step. Add your SSH private key to `ssh-agent`.
```sh
ssh-add ~/.ssh/id_rsa
@ -115,9 +115,9 @@ Apply the changes to create the cluster.
```sh
$ terraform apply
...
module.azure-ramius.null_resource.bootkube-start: Still creating... (6m50s elapsed)
module.azure-ramius.null_resource.bootkube-start: Still creating... (7m0s elapsed)
module.azure-ramius.null_resource.bootkube-start: Creation complete after 7m8s (ID: 3961816482286168143)
module.azure-ramius.null_resource.bootstrap: Still creating... (6m50s elapsed)
module.azure-ramius.null_resource.bootstrap: Still creating... (7m0s elapsed)
module.azure-ramius.null_resource.bootstrap: Creation complete after 7m8s (ID: 3961816482286168143)
Apply complete! Resources: 86 added, 0 changed, 0 destroyed.
```
@ -144,19 +144,15 @@ $ kubectl get pods --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system coredns-7c6fbb4f4b-b6qzx 1/1 Running 0 26m
kube-system coredns-7c6fbb4f4b-j2k3d 1/1 Running 0 26m
kube-system flannel-bwf24 2/2 Running 2 26m
kube-system flannel-bwf24 2/2 Running 0 26m
kube-system flannel-ks5qb 2/2 Running 0 26m
kube-system flannel-tq2wg 2/2 Running 0 26m
kube-system kube-apiserver-hxgsx 1/1 Running 3 26m
kube-system kube-controller-manager-5ff9cd7bb6-b942n 1/1 Running 0 26m
kube-system kube-controller-manager-5ff9cd7bb6-bbr6w 1/1 Running 0 26m
kube-system kube-apiserver-ramius-controller-0 1/1 Running 0 26m
kube-system kube-controller-manager-ramius-controller-0 1/1 Running 0 26m
kube-system kube-proxy-j4vpq 1/1 Running 0 26m
kube-system kube-proxy-jxr5d 1/1 Running 0 26m
kube-system kube-proxy-lbdw5 1/1 Running 0 26m
kube-system kube-scheduler-5f76d69686-s4fbx 1/1 Running 0 26m
kube-system kube-scheduler-5f76d69686-vgdgn 1/1 Running 0 26m
kube-system pod-checkpointer-cnqdg 1/1 Running 0 26m
kube-system pod-checkpointer-cnqdg-ramius-controller-0 1/1 Running 0 25m
kube-system kube-scheduler-ramius-controller-0 1/1 Running 0 26m
```
## Going Further

24
docs/cl/digital-ocean.md
View File

@ -4,7 +4,7 @@ In this tutorial, we'll create a Kubernetes v1.15.3 cluster on DigitalOcean with
We'll declare a Kubernetes cluster using the Typhoon Terraform module. Then apply the changes to create controller droplets, worker droplets, DNS records, tags, and TLS assets.
Controllers are provisioned to run an `etcd-member` peer and a `kubelet` service. Workers run just a `kubelet` service. A one-time [bootkube](https://github.com/kubernetes-incubator/bootkube) bootstrap schedules the `apiserver`, `scheduler`, `controller-manager`, and `coredns` on controllers and schedules `kube-proxy` and `flannel` on every node. A generated `kubeconfig` provides `kubectl` access to the cluster.
Controller hosts are provisioned to run an `etcd-member` peer and a `kubelet` service. Worker hosts run a `kubelet` service. Controller nodes run `kube-apiserver`, `kube-scheduler`, `kube-controller-manager`, and `coredns`, while `kube-proxy` and `calico` (or `flannel`) run on every node. A generated `kubeconfig` provides `kubectl` access to the cluster.
## Requirements
@ -85,7 +85,7 @@ Reference the [variables docs](#variables) or the [variables.tf](https://github.
## ssh-agent
Initial bootstrapping requires `bootkube.service` be started on one controller node. Terraform uses `ssh-agent` to automate this step. Add your SSH private key to `ssh-agent`.
Initial bootstrapping requires `bootstrap.service` be started on one controller node. Terraform uses `ssh-agent` to automate this step. Add your SSH private key to `ssh-agent`.
```sh
ssh-add ~/.ssh/id_rsa
@ -111,11 +111,11 @@ Apply the changes to create the cluster.
```sh
$ terraform apply
module.digital-ocean-nemo.null_resource.bootkube-start: Still creating... (30s elapsed)
module.digital-ocean-nemo.null_resource.bootkube-start: Provisioning with 'remote-exec'...
module.digital-ocean-nemo.null_resource.bootstrap: Still creating... (30s elapsed)
module.digital-ocean-nemo.null_resource.bootstrap: Provisioning with 'remote-exec'...
...
module.digital-ocean-nemo.null_resource.bootkube-start: Still creating... (6m20s elapsed)
module.digital-ocean-nemo.null_resource.bootkube-start: Creation complete (ID: 7599298447329218468)
module.digital-ocean-nemo.null_resource.bootstrap: Still creating... (6m20s elapsed)
module.digital-ocean-nemo.null_resource.bootstrap: Creation complete (ID: 7599298447329218468)
Apply complete! Resources: 54 added, 0 changed, 0 destroyed.
```
@ -142,18 +142,14 @@ NAMESPACE NAME READY STATUS RES
kube-system coredns-1187388186-ld1j7 1/1 Running 0 11m
kube-system coredns-1187388186-rdhf7 1/1 Running 0 11m
kube-system flannel-1cq1v 2/2 Running 0 11m
kube-system flannel-hq9t0 2/2 Running 1 11m
kube-system flannel-hq9t0 2/2 Running 0 11m
kube-system flannel-v0g9w 2/2 Running 0 11m
kube-system kube-apiserver-n10qr 1/1 Running 0 11m
kube-system kube-controller-manager-3271970485-37gtw 1/1 Running 1 11m
kube-system kube-controller-manager-3271970485-p52t5 1/1 Running 0 11m
kube-system kube-apiserver-ip-10.132.115.81 1/1 Running 0 11m
kube-system kube-controller-manager-ip-10.132.115.81 1/1 Running 0 11m
kube-system kube-proxy-6kxjf 1/1 Running 0 11m
kube-system kube-proxy-fh3td 1/1 Running 0 11m
kube-system kube-proxy-k35rc 1/1 Running 0 11m
kube-system kube-scheduler-3895335239-2bc4c 1/1 Running 0 11m
kube-system kube-scheduler-3895335239-b7q47 1/1 Running 1 11m
kube-system pod-checkpointer-pr1lq 1/1 Running 0 11m
kube-system pod-checkpointer-pr1lq-10.132.115.81 1/1 Running 0 10m
kube-system kube-scheduler-ip-10.132.115.81 1/1 Running 0 11m
```
## Going Further

22
docs/cl/google-cloud.md
View File

@ -4,7 +4,7 @@ In this tutorial, we'll create a Kubernetes v1.15.3 cluster on Google Compute En
We'll declare a Kubernetes cluster using the Typhoon Terraform module. Then apply the changes to create a network, firewall rules, health checks, controller instances, worker managed instance group, load balancers, and TLS assets.
Controllers are provisioned to run an `etcd-member` peer and a `kubelet` service. Workers run just a `kubelet` service. A one-time [bootkube](https://github.com/kubernetes-incubator/bootkube) bootstrap schedules the `apiserver`, `scheduler`, `controller-manager`, and `coredns` on controllers and schedules `kube-proxy` and `calico` (or `flannel`) on every node. A generated `kubeconfig` provides `kubectl` access to the cluster.
Controller hosts are provisioned to run an `etcd-member` peer and a `kubelet` service. Worker hosts run a `kubelet` service. Controller nodes run `kube-apiserver`, `kube-scheduler`, `kube-controller-manager`, and `coredns`, while `kube-proxy` and `calico` (or `flannel`) run on every node. A generated `kubeconfig` provides `kubectl` access to the cluster.
## Requirements
@ -92,7 +92,7 @@ Reference the [variables docs](#variables) or the [variables.tf](https://github.
## ssh-agent
Initial bootstrapping requires `bootkube.service` be started on one controller node. Terraform uses `ssh-agent` to automate this step. Add your SSH private key to `ssh-agent`.
Initial bootstrapping requires `bootstrap.service` be started on one controller node. Terraform uses `ssh-agent` to automate this step. Add your SSH private key to `ssh-agent`.
```sh
ssh-add ~/.ssh/id_rsa
@ -118,12 +118,11 @@ Apply the changes to create the cluster.
```sh
$ terraform apply
module.google-cloud-yavin.null_resource.bootkube-start: Still creating... (10s elapsed)
module.google-cloud-yavin.null_resource.bootstrap: Still creating... (10s elapsed)
...
module.google-cloud-yavin.null_resource.bootkube-start: Still creating... (5m30s elapsed)
module.google-cloud-yavin.null_resource.bootkube-start: Still creating... (5m40s elapsed)
module.google-cloud-yavin.null_resource.bootkube-start: Creation complete (ID: 5768638456220583358)
module.google-cloud-yavin.null_resource.bootstrap: Still creating... (5m30s elapsed)
module.google-cloud-yavin.null_resource.bootstrap: Still creating... (5m40s elapsed)
module.google-cloud-yavin.null_resource.bootstrap: Creation complete (ID: 5768638456220583358)
Apply complete! Resources: 64 added, 0 changed, 0 destroyed.
```
@ -153,15 +152,12 @@ kube-system calico-node-d1l5b 2/2 Running 0
kube-system calico-node-sp9ps 2/2 Running 0 6m
kube-system coredns-1187388186-dkh3o 1/1 Running 0 6m
kube-system coredns-1187388186-zj5dl 1/1 Running 0 6m
kube-system kube-apiserver-zppls 1/1 Running 0 6m
kube-system kube-controller-manager-3271970485-gh9kt 1/1 Running 0 6m
kube-system kube-controller-manager-3271970485-h90v8 1/1 Running 1 6m
kube-system kube-apiserver-controller-0 1/1 Running 0 6m
kube-system kube-controller-manager-controller-0 1/1 Running 0 6m
kube-system kube-proxy-117v6 1/1 Running 0 6m
kube-system kube-proxy-9886n 1/1 Running 0 6m
kube-system kube-proxy-njn47 1/1 Running 0 6m
kube-system kube-scheduler-3895335239-5x87r 1/1 Running 0 6m
kube-system kube-scheduler-3895335239-bzrrt 1/1 Running 1 6m
kube-system pod-checkpointer-l6lrt 1/1 Running 0 6m
kube-system kube-scheduler-controller-0 1/1 Running 0 6m
```
## Going Further

10
docs/index.md
View File

@ -95,16 +95,12 @@ kube-system calico-node-d1l5b 2/2 Running 0
kube-system calico-node-sp9ps 2/2 Running 0 6m
kube-system coredns-1187388186-dkh3o 1/1 Running 0 6m
kube-system coredns-1187388186-zj5dl 1/1 Running 0 6m
kube-system kube-apiserver-zppls 1/1 Running 0 6m
kube-system kube-controller-manager-3271970485-gh9kt 1/1 Running 0 6m
kube-system kube-controller-manager-3271970485-h90v8 1/1 Running 1 6m
kube-system kube-apiserver-controller-0 1/1 Running 0 6m
kube-system kube-controller-manager-controller-0 1/1 Running 0 6m
kube-system kube-proxy-117v6 1/1 Running 0 6m
kube-system kube-proxy-9886n 1/1 Running 0 6m
kube-system kube-proxy-njn47 1/1 Running 0 6m
kube-system kube-scheduler-3895335239-5x87r 1/1 Running 0 6m
kube-system kube-scheduler-3895335239-bzrrt 1/1 Running 1 6m
kube-system pod-checkpointer-l6lrt 1/1 Running 0 6m
kube-system pod-checkpointer-l6lrt-controller-0 1/1 Running 0 6m
kube-system kube-scheduler-controller-0 1/1 Running 0 6m
```
## Help

2
google-cloud/container-linux/kubernetes/README.md
View File

@ -11,7 +11,7 @@ Typhoon distributes upstream Kubernetes, architectural conventions, and cluster
## Features <a href="https://www.cncf.io/certification/software-conformance/"><img align="right" src="https://storage.googleapis.com/poseidon/certified-kubernetes.png"></a>
* Kubernetes v1.15.3 (upstream, via [kubernetes-incubator/bootkube](https://github.com/kubernetes-incubator/bootkube))
* Kubernetes v1.15.3 (upstream)
* Single or multi-master, [Calico](https://www.projectcalico.org/) or [flannel](https://github.com/coreos/flannel) networking
* On-cluster etcd with TLS, [RBAC](https://kubernetes.io/docs/admin/authorization/rbac/)-enabled, [network policy](https://kubernetes.io/docs/concepts/services-networking/network-policies/)
* Advanced features like [worker pools](https://typhoon.psdn.io/advanced/worker-pools/), [preemptible](https://typhoon.psdn.io/cl/google-cloud/#preemption) workers, and [snippets](https://typhoon.psdn.io/advanced/customization/#container-linux) customization

2
google-cloud/container-linux/kubernetes/bootkube.tf
View File

@ -1,6 +1,6 @@
# Self-hosted Kubernetes assets (kubeconfig, manifests)
module "bootkube" {
source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=98cc19f80f2c4c3ddc63fc7aea6320e74bec561a"
source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=6e59af71138bc5f784453873074de16e7ee150eb"
cluster_name = var.cluster_name
api_servers = [format("%s.%s", var.cluster_name, var.dns_zone)]

63
google-cloud/container-linux/kubernetes/cl/controller.yaml.tmpl
View File

@ -97,17 +97,28 @@ systemd:
RestartSec=10
[Install]
WantedBy=multi-user.target
- name: bootkube.service
- name: bootstrap.service
contents: |
[Unit]
Description=Bootstrap a Kubernetes cluster
ConditionPathExists=!/opt/bootkube/init_bootkube.done
Description=Kubernetes control plane
ConditionPathExists=!/opt/bootstrap/bootstrap.done
[Service]
Type=oneshot
RemainAfterExit=true
WorkingDirectory=/opt/bootkube
ExecStart=/opt/bootkube/bootkube-start
ExecStartPost=/bin/touch /opt/bootkube/init_bootkube.done
WorkingDirectory=/opt/bootstrap
ExecStartPre=-/usr/bin/bash -c 'set -x && [ -n "$(ls /opt/bootstrap/assets/manifests-*/* 2>/dev/null)" ] && mv /opt/bootstrap/assets/manifests-*/* /opt/bootstrap/assets/manifests && rm -rf /opt/bootstrap/assets/manifests-*'
ExecStart=/usr/bin/rkt run \
--trust-keys-from-https \
--volume assets,kind=host,source=/opt/bootstrap/assets \
--mount volume=assets,target=/assets \
--volume script,kind=host,source=/opt/bootstrap/apply \
--mount volume=script,target=/apply \
--insecure-options=image \
docker://k8s.gcr.io/hyperkube:v1.15.3 \
--net=host \
--dns=host \
--exec=/apply
ExecStartPost=/bin/touch /opt/bootstrap/bootstrap.done
[Install]
WantedBy=multi-user.target
storage:
@ -125,36 +136,26 @@ storage:
inline: |
KUBELET_IMAGE_URL=docker://k8s.gcr.io/hyperkube
KUBELET_IMAGE_TAG=v1.15.3
- path: /opt/bootstrap/apply
filesystem: root
mode: 0544
contents:
inline: |
#!/bin/bash -e
export KUBECONFIG=/assets/auth/kubeconfig
until kubectl version; do
echo "Waiting for static pod control plane"
sleep 5
done
until kubectl apply -f /assets/manifests -R; do
echo "Retry applying manifests"
sleep 5
done
- path: /etc/sysctl.d/max-user-watches.conf
filesystem: root
contents:
inline: |
fs.inotify.max_user_watches=16184
- path: /opt/bootkube/bootkube-start
filesystem: root
mode: 0544
user:
id: 500
group:
id: 500
contents:
inline: |
#!/bin/bash
# Wrapper for bootkube start
set -e
# Move experimental manifests
[ -n "$(ls /opt/bootkube/assets/manifests-*/* 2>/dev/null)" ] && mv /opt/bootkube/assets/manifests-*/* /opt/bootkube/assets/manifests && rm -rf /opt/bootkube/assets/manifests-*
exec /usr/bin/rkt run \
--trust-keys-from-https \
--volume assets,kind=host,source=/opt/bootkube/assets \
--mount volume=assets,target=/assets \
--volume bootstrap,kind=host,source=/etc/kubernetes \
--mount volume=bootstrap,target=/etc/kubernetes \
$${RKT_OPTS} \
quay.io/coreos/bootkube:v0.14.0 \
--net=host \
--dns=host \
--exec=/bootkube -- start --asset-dir=/assets "$@"
passwd:
users:
- name: core

14
google-cloud/container-linux/kubernetes/network.tf
View File

@ -48,6 +48,20 @@ resource "google_compute_firewall" "internal-etcd-metrics" {
target_tags = ["${var.cluster_name}-controller"]
}
# Allow Prometheus to scrape kube-scheduler and kube-controller-manager metrics
resource "google_compute_firewall" "internal-kube-metrics" {
name = "${var.cluster_name}-internal-kube-metrics"
network = google_compute_network.network.name
allow {
protocol = "tcp"
ports = [10251, 10252]
}
source_tags = ["${var.cluster_name}-worker"]
target_tags = ["${var.cluster_name}-controller"]
}
resource "google_compute_firewall" "allow-apiserver" {
name = "${var.cluster_name}-allow-apiserver"
network = google_compute_network.network.name

36
google-cloud/container-linux/kubernetes/ssh.tf
View File

@ -1,10 +1,14 @@
# Secure copy etcd TLS assets to controllers.
# Secure copy assets to controllers.
resource "null_resource" "copy-controller-secrets" {
count = var.controller_count
depends_on = [
module.bootkube,
]
connection {
type = "ssh"
host = element(local.controllers_ipv4_public, count.index)
host = local.controllers_ipv4_public[count.index]
user = "core"
timeout = "15m"
}
@ -44,6 +48,11 @@ resource "null_resource" "copy-controller-secrets" {
destination = "$HOME/etcd-peer.key"
}
provisioner "file" {
source = var.asset_dir
destination = "$HOME/assets"
}
provisioner "remote-exec" {
inline = [
"sudo mkdir -p /etc/ssl/etcd/etcd",
@ -56,36 +65,33 @@ resource "null_resource" "copy-controller-secrets" {
"sudo mv etcd-peer.key /etc/ssl/etcd/etcd/peer.key",
"sudo chown -R etcd:etcd /etc/ssl/etcd",
"sudo chmod -R 500 /etc/ssl/etcd",
"sudo mv $HOME/assets /opt/bootstrap/assets",
"sudo mkdir -p /etc/kubernetes/bootstrap-secrets",
"sudo cp -r /opt/bootstrap/assets/tls/* /etc/kubernetes/bootstrap-secrets/",
"sudo cp /opt/bootstrap/assets/auth/kubeconfig /etc/kubernetes/bootstrap-secrets/",
"sudo cp -r /opt/bootstrap/assets/static-manifests/* /etc/kubernetes/manifests/",
]
}
}
# Secure copy bootkube assets to ONE controller and start bootkube to perform
# one-time self-hosted cluster bootstrapping.
resource "null_resource" "bootkube-start" {
# Connect to a controller to perform one-time cluster bootstrap.
resource "null_resource" "bootstrap" {
depends_on = [
module.bootkube,
null_resource.copy-controller-secrets,
module.workers,
google_dns_record_set.apiserver,
null_resource.copy-controller-secrets,
]
connection {
type = "ssh"
host = element(local.controllers_ipv4_public, 0)
host = local.controllers_ipv4_public[0]
user = "core"
timeout = "15m"
}
provisioner "file" {
source = var.asset_dir
destination = "$HOME/assets"
}
provisioner "remote-exec" {
inline = [
"sudo mv $HOME/assets /opt/bootkube",
"sudo systemctl start bootkube",
"sudo systemctl start bootstrap",
]
}
}