feat: replace stale-containers systemd timer with kubelet-args

Signed-off-by: Devin Buhl <devin@buhl.casa>

bootstrap/templates/ansible/inventory/group_vars/master/main.yaml.j2

@@ -41,3 +41,7 @@ k3s_server:
     - "bind-address=0.0.0.0"          # Required to monitor kube-scheduler with kube-prometheus-stack
   kube-apiserver-arg:
     - "anonymous-auth=true"           # Required for HAProxy health-checks
+  # TODO: Move these options to a kubelet config file
+  kubelet-arg:
+    - "image-gc-high-threshold=55"
+    - "image-gc-low-threshold=50"

bootstrap/templates/ansible/inventory/group_vars/worker/main.yaml.j2

@@ -11,3 +11,7 @@ k3s_agent:
   node-ip: "{% raw %}{{ ansible_host }}{% endraw %}"
 {% endif %}
   pause-image: registry.k8s.io/pause:3.9
+  # TODO: Move these options to a kubelet config file
+  kubelet-arg:
+    - "image-gc-high-threshold=55"
+    - "image-gc-low-threshold=50"

bootstrap/templates/ansible/playbooks/cluster-installation.yaml.j2

@@ -68,8 +68,3 @@
     - name: Cruft
       when: k3s_primary_control_node
       ansible.builtin.include_tasks: tasks/cruft.yaml
-
-    - name: Stale Containers
-      ansible.builtin.include_tasks: tasks/stale_containers.yaml
-      vars:
-        stale_containers_state: enabled

bootstrap/templates/ansible/playbooks/cluster-nuke.yaml.j2

@@ -90,11 +90,6 @@
         state: absent
       loop: ["kubectl", "crictl", "ctr"]
 
-    - name: Stale Containers
-      ansible.builtin.include_tasks: tasks/stale_containers.yaml
-      vars:
-        stale_containers_state: disabled
-
     - name: Reboot
       ansible.builtin.reboot:
         msg: Rebooting nodes

bootstrap/templates/ansible/playbooks/files/stale-containers.service.j2

@@ -1,6 +0,0 @@
-[Unit]
-Description=Stale containers
-
-[Service]
-Type=oneshot
-ExecStart=/usr/local/bin/k3s crictl rmi --prune

bootstrap/templates/ansible/playbooks/files/stale-containers.timer.j2

@@ -1,11 +0,0 @@
-[Unit]
-Description=Stale containers
-
-[Timer]
-OnCalendar=weekly
-AccuracySec=1h
-Persistent=true
-RandomizedDelaySec=6000
-
-[Install]
-WantedBy=timers.target

bootstrap/templates/ansible/playbooks/tasks/stale_containers.yaml.j2

@@ -1,36 +0,0 @@
----
-# https://github.com/k3s-io/k3s/issues/1900
-- name: Enabled Stale containers
-  when: stale_containers_state == "enabled"
-  block:
-    - name: Stale containers | Create systemd unit
-      ansible.builtin.copy:
-        src: files/stale-containers.service
-        dest: /etc/systemd/system/stale-containers.service
-        owner: root
-        group: root
-        mode: "0644"
-
-    - name: Stale containers | Create systemd timer
-      ansible.builtin.copy:
-        src: files/stale-containers.timer
-        dest: /etc/systemd/system/stale-containers.timer
-        owner: root
-        group: root
-        mode: "0644"
-
-    - name: Stale containers | Start the systemd timer
-      ansible.builtin.systemd:
-        name: stale-containers.timer
-        enabled: true
-        daemon_reload: true
-        masked: false
-        state: started
-
-- name: Disable Stale containers
-  when: stale_containers_state == "disabled"
-  block:
-    - name: Stale containers | Mask the systemd timer
-      ansible.builtin.systemd:
-        name: stale-containers.timer
-        masked: true