Add Alpine Linux configuration

Signed-off-by: Jiayi Hu <jiayi.ghu@gmail.com>

roles/k3s/master/tasks/main.yml

@@ -1,20 +1,10 @@
 ---
 
-- name: Copy K3s service file
-  register: k3s_service
-  template:
-    src: "k3s.service.j2"
-    dest: "{{ systemd_dir }}/k3s.service"
-    owner: root
-    group: root
-    mode: 0755
-
-- name: Enable and check K3s service
-  systemd:
-    name: k3s
-    daemon_reload: yes
-    state: restarted
-    enabled: yes
+- name: Create and enable K3s service
+  include_tasks: "{{ item }}"
+  with_first_found:
+    - "prereq/{{ ansible_distribution }}.yml"
+    - "prereq/default.yml"
 
 - name: Wait for node-token
   wait_for:
@@ -61,7 +51,7 @@
 
 - name: Replace https://localhost:6443 by https://master-ip:6443
   command: >-
-    k3s kubectl config set-cluster default
+    /usr/local/bin/k3s kubectl config set-cluster default
       --server=https://{{ master_ip }}:6443
       --kubeconfig ~{{ ansible_user }}/.kube/config
   changed_when: true

roles/k3s/master/tasks/prereq/Alpine.yml

@@ -0,0 +1,30 @@
+---
+- name: Copy K3s service file
+  register: k3s_service
+  copy:
+    content: |
+      #!/sbin/openrc-run
+
+      name="k3s server"
+      command="/usr/local/bin/k3s"
+      command_args="server {{ extra_server_args | default("") }}"
+      command_background=true
+      pidfile="/run/${RC_SVCNAME}.pid"
+      output_log="/var/log/k3s.log"
+      error_log="/var/log/k3s.err"
+    dest: /etc/init.d/k3s
+    owner: root
+    group: root
+    mode: 0755
+
+- name: Create K3s service symlink
+  file:
+    src: /etc/init.d/k3s
+    dest: /etc/runlevels/default/k3s
+    state: link
+
+- name: Enable and check K3s service
+  service:
+    name: k3s
+    state: restarted
+    enabled: yes

roles/k3s/master/tasks/prereq/default.yml

@@ -0,0 +1,16 @@
+---
+- name: Copy K3s service file
+  register: k3s_service
+  template:
+    src: "k3s.service.j2"
+    dest: "{{ systemd_dir }}/k3s.service"
+    owner: root
+    group: root
+    mode: 0755
+
+- name: Enable and check K3s service
+  systemd:
+    name: k3s
+    daemon_reload: yes
+    state: restarted
+    enabled: yes

roles/k3s/node/tasks/main.yml

@@ -1,16 +1,7 @@
 ---
 
-- 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
+- name: Create and enable K3s service
+  include_tasks: "{{ item }}"
+  with_first_found:
+    - "prereq/{{ ansible_distribution }}.yml"
+    - "prereq/default.yml"

roles/k3s/node/tasks/prereq/Alpine.yml

@@ -0,0 +1,30 @@
+---
+- name: Copy K3s service file
+  register: k3s_service
+  copy:
+    content: |
+      #!/sbin/openrc-run
+
+      name="k3s agent"
+      command="/usr/local/bin/k3s"
+      command_args="agent --server https://{{ master_ip }}:6443 --token {{ hostvars[groups['master'][0]]['token'] }} {{ extra_agent_args | default("") }}"
+      command_background=true
+      pidfile="/run/${RC_SVCNAME}.pid"
+      output_log="/var/log/k3s.log"
+      error_log="/var/log/k3s.err"
+    dest: /etc/init.d/k3s
+    owner: root
+    group: root
+    mode: 0755
+
+- name: Create K3s service symlink
+  file:
+    src: /etc/init.d/k3s
+    dest: /etc/runlevels/default/k3s
+    state: link
+
+- name: Enable and check K3s service
+  service:
+    name: k3s
+    state: restarted
+    enabled: yes

roles/k3s/node/tasks/prereq/default.yml

@@ -0,0 +1,15 @@
+---
+- 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

roles/raspberrypi/handlers/main.yml

@@ -1,3 +1,7 @@
 ---
 - name: reboot
   reboot:
+
+- name: lbu
+  debug:
+    msg: If you are diskless on Alpine you should commit changes with 'lbu -u' now and reboot.

roles/raspberrypi/tasks/prereq/Alpine.yml

@@ -0,0 +1,29 @@
+---
+- name: Add cgroup mount point
+  lineinfile:
+    path: /etc/fstab
+    line: cgroup /sys/fs/cgroup cgroup defaults 0 0
+
+- name: Define cgroup mount points
+  copy:
+    content: |
+      mount {
+        cpuacct = /cgroup/cpuacct;
+        memory = /cgroup/memory;
+        devices = /cgroup/devices;
+        freezer = /cgroup/freezer;
+        net_cls = /cgroup/net_cls;
+        blkio = /cgroup/blkio;
+        cpuset = /cgroup/cpuset;
+        cpu = /cgroup/cpu;
+      }
+    dest: /etc/cgconfig.conf
+    mode: 0644
+
+- name: Enable cgroup via boot commandline if not already enabled
+  lineinfile:
+    path: /media/mmcblk0p1/cmdline.txt
+    backrefs: yes
+    regexp: '^((?!.*\bcgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory\b).*)$'
+    line: '\1 cgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory'
+  notify: lbu