Add Terraform module for bare-metal PXE workers
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parent
eb0df49171
commit
4175b3ba66
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---
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systemd:
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units:
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- name: docker.service
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enable: true
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- name: locksmithd.service
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mask: true
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- name: kubelet.path
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enable: true
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contents: |
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[Unit]
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Description=Watch for kubeconfig
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[Path]
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PathExists=/etc/kubernetes/kubeconfig
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[Install]
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WantedBy=multi-user.target
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- name: wait-for-dns.service
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enable: true
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contents: |
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[Unit]
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Description=Wait for DNS entries
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Wants=systemd-resolved.service
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Before=kubelet.service
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[Service]
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Type=oneshot
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RemainAfterExit=true
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ExecStart=/bin/sh -c 'while ! /usr/bin/grep '^[^#[:space:]]' /etc/resolv.conf > /dev/null; do sleep 1; done'
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[Install]
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RequiredBy=kubelet.service
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- name: kubelet.service
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contents: |
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[Unit]
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Description=Kubelet via Hyperkube ACI
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[Service]
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EnvironmentFile=/etc/kubernetes/kubelet.env
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Environment="RKT_RUN_ARGS=--uuid-file-save=/var/run/kubelet-pod.uuid \
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--volume=resolv,kind=host,source=/etc/resolv.conf \
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--mount volume=resolv,target=/etc/resolv.conf \
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--volume var-lib-cni,kind=host,source=/var/lib/cni \
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--mount volume=var-lib-cni,target=/var/lib/cni \
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--volume var-log,kind=host,source=/var/log \
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--mount volume=var-log,target=/var/log"
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ExecStartPre=/bin/mkdir -p /etc/kubernetes/manifests
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ExecStartPre=/bin/mkdir -p /etc/kubernetes/cni/net.d
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ExecStartPre=/bin/mkdir -p /etc/kubernetes/checkpoint-secrets
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ExecStartPre=/bin/mkdir -p /etc/kubernetes/inactive-manifests
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ExecStartPre=/bin/mkdir -p /var/lib/cni
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ExecStartPre=/usr/bin/bash -c "grep 'certificate-authority-data' /etc/kubernetes/kubeconfig | awk '{print $2}' | base64 -d > /etc/kubernetes/ca.crt"
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ExecStartPre=-/usr/bin/rkt rm --uuid-file=/var/run/kubelet-pod.uuid
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ExecStart=/usr/lib/coreos/kubelet-wrapper \
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--kubeconfig=/etc/kubernetes/kubeconfig \
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--require-kubeconfig \
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--client-ca-file=/etc/kubernetes/ca.crt \
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--anonymous-auth=false \
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--cni-conf-dir=/etc/kubernetes/cni/net.d \
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--network-plugin=cni \
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--lock-file=/var/run/lock/kubelet.lock \
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--exit-on-lock-contention \
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--pod-manifest-path=/etc/kubernetes/manifests \
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--allow-privileged \
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--hostname-override={{.domain_name}} \
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--node-labels=node-role.kubernetes.io/node \
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--cluster_dns={{.k8s_dns_service_ip}} \
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--cluster_domain=cluster.local
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ExecStop=-/usr/bin/rkt stop --uuid-file=/var/run/kubelet-pod.uuid
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Restart=always
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RestartSec=5
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[Install]
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WantedBy=multi-user.target
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storage:
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{{ if index . "pxe" }}
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disks:
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- device: /dev/sda
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wipe_table: true
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partitions:
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- label: ROOT
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filesystems:
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- name: root
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mount:
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device: "/dev/sda1"
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format: "ext4"
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create:
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force: true
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options:
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- "-LROOT"
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{{end}}
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files:
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- path: /etc/kubernetes/kubelet.env
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filesystem: root
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mode: 0644
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contents:
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inline: |
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KUBELET_IMAGE_URL=quay.io/coreos/hyperkube
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KUBELET_IMAGE_TAG=v1.6.6_coreos.1
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- path: /etc/hostname
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filesystem: root
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mode: 0644
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contents:
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inline:
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{{.domain_name}}
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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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passwd:
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users:
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- name: core
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ssh_authorized_keys:
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- {{.ssh_authorized_key}}
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@ -0,0 +1,21 @@
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resource "matchbox_group" "workers" {
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count = "${length(var.worker_names)}"
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name = "${format("%s-%s", var.cluster_name, element(var.worker_names, count.index))}"
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profile = "${matchbox_profile.bootkube-worker-pxe.name}"
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selector {
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mac = "${element(var.worker_macs, count.index)}"
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}
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metadata {
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pxe = "true"
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domain_name = "${element(var.worker_domains, count.index)}"
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etcd_endpoints = "${join(",", formatlist("%s:2379", var.controller_domains))}"
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# TODO
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etcd_on_host = "true"
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k8s_etcd_service_ip = "10.3.0.15"
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k8s_dns_service_ip = "${var.kube_dns_service_ip}"
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ssh_authorized_key = "${var.ssh_authorized_key}"
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}
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}
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@ -0,0 +1,20 @@
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// Container Linux Install profile (from release.core-os.net)
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resource "matchbox_profile" "bootkube-worker-pxe" {
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name = "bootkube-worker-pxe"
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kernel = "http://${var.container_linux_channel}.release.core-os.net/amd64-usr/${var.container_linux_version}/coreos_production_pxe.vmlinuz"
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initrd = [
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"http://${var.container_linux_channel}.release.core-os.net/amd64-usr/${var.container_linux_version}/coreos_production_pxe_image.cpio.gz",
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]
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args = [
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"root=/dev/sda1",
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"coreos.config.url=${var.matchbox_http_endpoint}/ignition?uuid=$${uuid}&mac=$${mac:hexhyp}",
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"coreos.first_boot=yes",
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"console=tty0",
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"console=ttyS0",
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"kvm-intel.nested=1",
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]
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container_linux_config = "${file("${path.module}/cl/bootkube-worker.yaml.tmpl")}"
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}
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@ -0,0 +1,22 @@
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# Secure copy kubeconfig to all nodes to activate kubelet.service
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resource "null_resource" "copy-kubeconfig" {
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count = "${length(var.worker_names)}"
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connection {
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type = "ssh"
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host = "${element(var.worker_domains, count.index)}"
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user = "core"
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timeout = "60m"
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}
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provisioner "file" {
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content = "${var.kubeconfig}"
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destination = "$HOME/kubeconfig"
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}
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provisioner "remote-exec" {
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inline = [
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"sudo mv /home/core/kubeconfig /etc/kubernetes/kubeconfig",
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]
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}
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}
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@ -0,0 +1,55 @@
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variable "cluster_name" {
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description = "Cluster name"
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type = "string"
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}
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variable "matchbox_http_endpoint" {
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type = "string"
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description = "Matchbox HTTP read-only endpoint (e.g. http://matchbox.example.com:8080)"
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}
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variable "container_linux_channel" {
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type = "string"
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description = "Container Linux channel corresponding to the container_linux_version"
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}
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variable "container_linux_version" {
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type = "string"
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description = "Container Linux version of the kernel/initrd to PXE or the image to install"
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}
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variable "ssh_authorized_key" {
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type = "string"
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description = "SSH public key to set as an authorized key"
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}
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# machines
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# Terraform's crude "type system" does properly support lists of maps so we do this.
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variable "controller_domains" {
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type = "list"
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}
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variable "worker_names" {
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type = "list"
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}
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variable "worker_macs" {
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type = "list"
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}
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variable "worker_domains" {
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type = "list"
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}
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# bootkube
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variable "kubeconfig" {
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type = "string"
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}
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variable "kube_dns_service_ip" {
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description = "Kubernetes service IP for kube-dns (must be within server_cidr)"
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type = "string"
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default = "10.3.0.10"
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}
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