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Migrate Container Linux AWS to static pod control plane
* 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
parent
21632c6674
commit
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@ -11,7 +11,7 @@ Typhoon distributes upstream Kubernetes, architectural conventions, and cluster
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## Features <a href="https://www.cncf.io/certification/software-conformance/"><img align="right" src="https://storage.googleapis.com/poseidon/certified-kubernetes.png"></a>
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* Kubernetes v1.15.3 (upstream, via [kubernetes-incubator/bootkube](https://github.com/kubernetes-incubator/bootkube))
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* Kubernetes v1.15.3 (upstream)
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* Single or multi-master, [Calico](https://www.projectcalico.org/) or [flannel](https://github.com/coreos/flannel) networking
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* 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/)
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* Advanced features like [worker pools](https://typhoon.psdn.io/advanced/worker-pools/), [spot](https://typhoon.psdn.io/cl/aws/#spot) workers, and [snippets](https://typhoon.psdn.io/advanced/customization/#container-linux) customization
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@ -1,6 +1,6 @@
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# Self-hosted Kubernetes assets (kubeconfig, manifests)
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module "bootkube" {
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source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=98cc19f80f2c4c3ddc63fc7aea6320e74bec561a"
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source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=6e59af71138bc5f784453873074de16e7ee150eb"
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cluster_name = var.cluster_name
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api_servers = [format("%s.%s", var.cluster_name, var.dns_zone)]
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@ -98,17 +98,28 @@ systemd:
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RestartSec=10
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[Install]
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WantedBy=multi-user.target
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- name: bootkube.service
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- name: bootstrap.service
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contents: |
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[Unit]
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Description=Bootstrap a Kubernetes cluster
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ConditionPathExists=!/opt/bootkube/init_bootkube.done
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Description=Kubernetes control plane
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ConditionPathExists=!/opt/bootstrap/bootstrap.done
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[Service]
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Type=oneshot
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RemainAfterExit=true
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WorkingDirectory=/opt/bootkube
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ExecStart=/opt/bootkube/bootkube-start
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ExecStartPost=/bin/touch /opt/bootkube/init_bootkube.done
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WorkingDirectory=/opt/bootstrap
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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-*'
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ExecStart=/usr/bin/rkt run \
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--trust-keys-from-https \
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--volume assets,kind=host,source=/opt/bootstrap/assets \
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--mount volume=assets,target=/assets \
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--volume script,kind=host,source=/opt/bootstrap/apply \
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--mount volume=script,target=/apply \
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--insecure-options=image \
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docker://k8s.gcr.io/hyperkube:v1.15.3 \
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--net=host \
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--dns=host \
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--exec=/apply
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ExecStartPost=/bin/touch /opt/bootstrap/bootstrap.done
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[Install]
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WantedBy=multi-user.target
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storage:
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@ -126,36 +137,26 @@ storage:
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inline: |
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KUBELET_IMAGE_URL=docker://k8s.gcr.io/hyperkube
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KUBELET_IMAGE_TAG=v1.15.3
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- path: /opt/bootstrap/apply
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filesystem: root
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mode: 0544
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contents:
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inline: |
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#!/bin/bash -e
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export KUBECONFIG=/assets/auth/kubeconfig
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until kubectl version; do
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echo "Waiting for static pod control plane"
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sleep 5
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done
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until kubectl apply -f /assets/manifests -R; do
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echo "Retry applying manifests"
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sleep 5
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done
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- path: /etc/sysctl.d/max-user-watches.conf
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filesystem: root
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contents:
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inline: |
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fs.inotify.max_user_watches=16184
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- path: /opt/bootkube/bootkube-start
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filesystem: root
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mode: 0544
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user:
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id: 500
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group:
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id: 500
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contents:
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inline: |
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#!/bin/bash
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# Wrapper for bootkube start
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set -e
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# Move experimental manifests
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[ -n "$(ls /opt/bootkube/assets/manifests-*/* 2>/dev/null)" ] && mv /opt/bootkube/assets/manifests-*/* /opt/bootkube/assets/manifests && rm -rf /opt/bootkube/assets/manifests-*
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exec /usr/bin/rkt run \
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--trust-keys-from-https \
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--volume assets,kind=host,source=/opt/bootkube/assets \
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--mount volume=assets,target=/assets \
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--volume bootstrap,kind=host,source=/etc/kubernetes \
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--mount volume=bootstrap,target=/etc/kubernetes \
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$${RKT_OPTS} \
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quay.io/coreos/bootkube:v0.14.0 \
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--net=host \
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--dns=host \
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--exec=/bootkube -- start --asset-dir=/assets "$@"
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passwd:
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users:
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- name: core
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@ -33,6 +33,28 @@ resource "aws_security_group_rule" "controller-etcd" {
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self = true
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}
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# Allow Prometheus to scrape kube-scheduler
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resource "aws_security_group_rule" "controller-scheduler-metrics" {
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security_group_id = aws_security_group.controller.id
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type = "ingress"
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protocol = "tcp"
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from_port = 10251
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to_port = 10251
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source_security_group_id = aws_security_group.worker.id
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}
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# Allow Prometheus to scrape kube-controller-manager
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resource "aws_security_group_rule" "controller-manager-metrics" {
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security_group_id = aws_security_group.controller.id
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type = "ingress"
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protocol = "tcp"
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from_port = 10252
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to_port = 10252
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source_security_group_id = aws_security_group.worker.id
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}
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# Allow Prometheus to scrape etcd metrics
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resource "aws_security_group_rule" "controller-etcd-metrics" {
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security_group_id = aws_security_group.controller.id
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@ -1,10 +1,14 @@
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# Secure copy etcd TLS assets to controllers.
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# Secure copy assets to controllers.
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resource "null_resource" "copy-controller-secrets" {
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count = var.controller_count
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depends_on = [
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module.bootkube,
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]
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connection {
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type = "ssh"
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host = element(aws_instance.controllers.*.public_ip, count.index)
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host = aws_instance.controllers.*.public_ip[count.index]
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user = "core"
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timeout = "15m"
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}
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@ -43,6 +47,11 @@ resource "null_resource" "copy-controller-secrets" {
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content = module.bootkube.etcd_peer_key
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destination = "$HOME/etcd-peer.key"
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}
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provisioner "file" {
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source = var.asset_dir
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destination = "$HOME/assets"
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}
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provisioner "remote-exec" {
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inline = [
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@ -56,18 +65,21 @@ resource "null_resource" "copy-controller-secrets" {
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"sudo mv etcd-peer.key /etc/ssl/etcd/etcd/peer.key",
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"sudo chown -R etcd:etcd /etc/ssl/etcd",
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"sudo chmod -R 500 /etc/ssl/etcd",
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"sudo mv $HOME/assets /opt/bootstrap/assets",
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"sudo mkdir -p /etc/kubernetes/bootstrap-secrets",
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"sudo cp -r /opt/bootstrap/assets/tls/* /etc/kubernetes/bootstrap-secrets/",
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"sudo cp /opt/bootstrap/assets/auth/kubeconfig /etc/kubernetes/bootstrap-secrets/",
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"sudo cp -r /opt/bootstrap/assets/static-manifests/* /etc/kubernetes/manifests/",
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]
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}
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}
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# Secure copy bootkube assets to ONE controller and start bootkube to perform
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# one-time self-hosted cluster bootstrapping.
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resource "null_resource" "bootkube-start" {
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# Connect to a controller to perform one-time cluster bootstrap.
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resource "null_resource" "bootstrap" {
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depends_on = [
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module.bootkube,
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null_resource.copy-controller-secrets,
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module.workers,
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aws_route53_record.apiserver,
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null_resource.copy-controller-secrets,
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]
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connection {
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@ -77,15 +89,9 @@ resource "null_resource" "bootkube-start" {
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timeout = "15m"
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}
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provisioner "file" {
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source = var.asset_dir
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destination = "$HOME/assets"
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}
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provisioner "remote-exec" {
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inline = [
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"sudo mv $HOME/assets /opt/bootkube",
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"sudo systemctl start bootkube",
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"sudo systemctl start bootstrap",
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]
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}
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}
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@ -4,7 +4,7 @@ In this tutorial, we'll create a Kubernetes v1.15.3 cluster on AWS with Containe
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We'll declare a Kubernetes cluster using the Typhoon Terraform module. Then apply the changes to create a VPC, gateway, subnets, security groups, controller instances, worker auto-scaling group, network load balancer, and TLS assets.
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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.
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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.
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## Requirements
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@ -91,7 +91,7 @@ Reference the [variables docs](#variables) or the [variables.tf](https://github.
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## ssh-agent
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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`.
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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`.
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```sh
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ssh-add ~/.ssh/id_rsa
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@ -118,9 +118,9 @@ Apply the changes to create the cluster.
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```sh
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$ terraform apply
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...
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module.aws-tempest.null_resource.bootkube-start: Still creating... (4m50s elapsed)
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module.aws-tempest.null_resource.bootkube-start: Still creating... (5m0s elapsed)
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module.aws-tempest.null_resource.bootkube-start: Creation complete after 11m8s (ID: 3961816482286168143)
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module.aws-tempest.null_resource.bootstrap: Still creating... (4m50s elapsed)
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module.aws-tempest.null_resource.bootstrap: Still creating... (5m0s elapsed)
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module.aws-tempest.null_resource.bootstrap: Creation complete after 11m8s (ID: 3961816482286168143)
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Apply complete! Resources: 98 added, 0 changed, 0 destroyed.
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```
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@ -150,16 +150,12 @@ kube-system calico-node-7jmr1 2/2 Running 0
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kube-system calico-node-bknc8 2/2 Running 0 34m
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kube-system coredns-1187388186-wx1lg 1/1 Running 0 34m
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kube-system coredns-1187388186-qjnvp 1/1 Running 0 34m
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kube-system kube-apiserver-4mjbk 1/1 Running 0 34m
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kube-system kube-controller-manager-3597210155-j2jbt 1/1 Running 1 34m
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kube-system kube-controller-manager-3597210155-j7g7x 1/1 Running 0 34m
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kube-system kube-apiserver-ip-10-0-3-155 1/1 Running 0 34m
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kube-system kube-controller-manager-ip-10-0-3-155 1/1 Running 0 34m
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kube-system kube-proxy-14wxv 1/1 Running 0 34m
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kube-system kube-proxy-9vxh2 1/1 Running 0 34m
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kube-system kube-proxy-sbbsh 1/1 Running 0 34m
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kube-system kube-scheduler-3359497473-5plhf 1/1 Running 0 34m
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kube-system kube-scheduler-3359497473-r7zg7 1/1 Running 1 34m
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kube-system pod-checkpointer-4kxtl 1/1 Running 0 34m
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kube-system pod-checkpointer-4kxtl-ip-10-0-3-155 1/1 Running 0 33m
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kube-system kube-scheduler-ip-10-0-3-155 1/1 Running 1 34m
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```
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## Going Further
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