add ansible k3s setup

ansible/ansible.cfg

@@ -10,4 +10,3 @@ become = True
 host_key_checking = False
 deprecation_warnings = False
 callback_whitelist = profile_tasks
-ansible_stdout_callback=debug

ansible/inventory/.gitignore

@@ -1 +1,3 @@
-inventory.yaml
+*
+!.gitignore
+!sample

ansible/playbooks/k3s.yml

@@ -0,0 +1,19 @@
+---
+
+- hosts: k3s_cluster
+  gather_facts: yes
+  become: yes
+  roles:
+    - role: prereq
+    - role: download
+    - role: raspberrypi
+
+- hosts: master
+  become: yes
+  roles:
+    - role: k3s/master
+
+- hosts: node
+  become: yes
+  roles:
+    - role: k3s/node

ansible/playbooks/reset-k3s.yml

@@ -0,0 +1,7 @@
+---
+
+- hosts: k3s_cluster
+  gather_facts: yes
+  become: yes
+  roles:
+    - role: reset

ansible/roles/download/tasks/main.yml

@@ -0,0 +1,36 @@
+---
+
+- name: Download k3s binary x64
+  get_url:
+    url: https://github.com/k3s-io/k3s/releases/download/{{ k3s_version }}/k3s
+    checksum: sha256:https://github.com/k3s-io/k3s/releases/download/{{ k3s_version }}/sha256sum-amd64.txt
+    dest: /usr/local/bin/k3s
+    owner: root
+    group: root
+    mode: 0755
+  when: ansible_facts.architecture == "x86_64"
+
+- name: Download k3s binary arm64
+  get_url:
+    url: https://github.com/k3s-io/k3s/releases/download/{{ k3s_version }}/k3s-arm64
+    checksum: sha256:https://github.com/k3s-io/k3s/releases/download/{{ k3s_version }}/sha256sum-arm64.txt
+    dest: /usr/local/bin/k3s
+    owner: root
+    group: root
+    mode: 0755
+  when:
+    - ( ansible_facts.architecture is search("arm") and
+        ansible_facts.userspace_bits == "64" ) or
+      ansible_facts.architecture is search("aarch64")
+
+- name: Download k3s binary armhf
+  get_url:
+    url: https://github.com/k3s-io/k3s/releases/download/{{ k3s_version }}/k3s-armhf
+    checksum: sha256:https://github.com/k3s-io/k3s/releases/download/{{ k3s_version }}/sha256sum-arm.txt
+    dest: /usr/local/bin/k3s
+    owner: root
+    group: root
+    mode: 0755
+  when:
+    - ansible_facts.architecture is search("arm")
+    - ansible_facts.userspace_bits == "32"

ansible/roles/k3s/master/defaults/main.yml

@@ -0,0 +1,2 @@
+---
+k3s_server_location: /var/lib/rancher/k3s

ansible/roles/k3s/master/tasks/main.yml

@@ -0,0 +1,79 @@
+---
+
+- name: Copy K3s service file
+  register: k3s_service
+  template:
+    src: "k3s.service.j2"
+    dest: "{{ systemd_dir }}/k3s.service"
+    owner: root
+    group: root
+    mode: 0644
+
+- name: Enable and check K3s service
+  systemd:
+    name: k3s
+    daemon_reload: yes
+    state: restarted
+    enabled: yes
+
+- name: Wait for node-token
+  wait_for:
+    path: "{{ k3s_server_location }}/server/node-token"
+
+- name: Register node-token file access mode
+  stat:
+    path: "{{ k3s_server_location }}/server/node-token"
+  register: p
+
+- name: Change file access node-token
+  file:
+    path: "{{ k3s_server_location }}/server/node-token"
+    mode: "g+rx,o+rx"
+
+- name: Read node-token from master
+  slurp:
+    path: "{{ k3s_server_location }}/server/node-token"
+  register: node_token
+
+- name: Store Master node-token
+  set_fact:
+    token: "{{ node_token.content | b64decode | regex_replace('\n', '') }}"
+
+- name: Restore node-token file access
+  file:
+    path: "{{ k3s_server_location }}/server/node-token"
+    mode: "{{ p.stat.mode }}"
+
+- name: Create directory .kube
+  file:
+    path: ~{{ ansible_user }}/.kube
+    state: directory
+    owner: "{{ ansible_user }}"
+    mode: "u=rwx,g=rx,o="
+
+- name: Copy config file to user home directory
+  copy:
+    src: /etc/rancher/k3s/k3s.yaml
+    dest: ~{{ ansible_user }}/.kube/config
+    remote_src: yes
+    owner: "{{ ansible_user }}"
+    mode: "u=rw,g=,o="
+
+- name: Replace https://localhost:6443 by https://master-ip:6443
+  command: >-
+    k3s kubectl config set-cluster default
+      --server=https://{{ master_ip }}:6443
+      --kubeconfig ~{{ ansible_user }}/.kube/config
+  changed_when: true
+
+- name: Create kubectl symlink
+  file:
+    src: /usr/local/bin/k3s
+    dest: /usr/local/bin/kubectl
+    state: link
+
+- name: Create crictl symlink
+  file:
+    src: /usr/local/bin/k3s
+    dest: /usr/local/bin/crictl
+    state: link

ansible/roles/k3s/master/templates/k3s.service.j2

@@ -0,0 +1,24 @@
+[Unit]
+Description=Lightweight Kubernetes
+Documentation=https://k3s.io
+After=network-online.target
+
+[Service]
+Type=notify
+ExecStartPre=-/sbin/modprobe br_netfilter
+ExecStartPre=-/sbin/modprobe overlay
+ExecStart=/usr/local/bin/k3s server --data-dir {{ k3s_server_location }} {{ extra_server_args | default("") }}
+KillMode=process
+Delegate=yes
+# Having non-zero Limit*s causes performance problems due to accounting overhead
+# in the kernel. We recommend using cgroups to do container-local accounting.
+LimitNOFILE=1048576
+LimitNPROC=infinity
+LimitCORE=infinity
+TasksMax=infinity
+TimeoutStartSec=0
+Restart=always
+RestartSec=5s
+
+[Install]
+WantedBy=multi-user.target

ansible/roles/k3s/node/tasks/main.yml

@@ -0,0 +1,16 @@
+---
+
+- name: Copy K3s service file
+  template:
+    src: "k3s.service.j2"
+    dest: "{{ systemd_dir }}/k3s-node.service"
+    owner: root
+    group: root
+    mode: 0755
+
+- name: Enable and check K3s service
+  systemd:
+    name: k3s-node
+    daemon_reload: yes
+    state: restarted
+    enabled: yes

ansible/roles/k3s/node/templates/k3s.service.j2

@@ -0,0 +1,24 @@
+[Unit]
+Description=Lightweight Kubernetes
+Documentation=https://k3s.io
+After=network-online.target
+
+[Service]
+Type=notify
+ExecStartPre=-/sbin/modprobe br_netfilter
+ExecStartPre=-/sbin/modprobe overlay
+ExecStart=/usr/local/bin/k3s agent --server https://{{ master_ip }}:6443 --token {{ hostvars[groups['master'][0]]['token'] }} {{ extra_agent_args | default("") }}
+KillMode=process
+Delegate=yes
+# Having non-zero Limit*s causes performance problems due to accounting overhead
+# in the kernel. We recommend using cgroups to do container-local accounting.
+LimitNOFILE=1048576
+LimitNPROC=infinity
+LimitCORE=infinity
+TasksMax=infinity
+TimeoutStartSec=0
+Restart=always
+RestartSec=5s
+
+[Install]
+WantedBy=multi-user.target