feat: add k3s kubelet args and enable graceful shutdown

tasks/prepare.yml

@@ -48,6 +48,15 @@
         mode: 0600
       notify: __k3s_restart
 
+    - name: Copy K3s kubelet config file
+      template:
+        src: "etc/rancher/k3s/kubelet.yaml.j2"
+        dest: "{{ __k3s_config_dir }}/kubelet.yaml"
+        owner: root
+        group: root
+        mode: 0600
+      notify: __k3s_restart
+
     - name: Copy K3s server config files
       template:
         src: "etc/rancher/k3s/server/{{ item }}.j2"

templates/_internal/kubelet-arg.yaml.j2

@@ -0,0 +1,2 @@
+#jinja2: lstrip_blocks: True
+- config={{ __k3s_config_dir }}/kubelet.yaml

templates/etc/rancher/k3s/config.yaml.j2

@@ -1,8 +1,13 @@
 #jinja2: lstrip_blocks: True
 ---
 {% set __k3s_kube_apiserver_arg = lookup('template', '_internal/apiserver-arg.yaml.j2') | from_yaml %}
+{% set __k3s_kubelet_arg = lookup('template', '_internal/kubelet-arg.yaml.j2') | from_yaml %}
 token: "{{ k3s_token }}"
 node-ip: "{{ k3s_node_ip }}"
+{% if __k3s_kubelet_arg is iterable %}
+kubelet-arg:
+  {{ __k3s_kubelet_arg | to_nice_yaml(indent=2) | indent(2, False) }}
+{% endif %}
 
 {% if k3s_server | bool %}
 bind-address: "{{ k3s_server_bind_ip }}"

templates/etc/rancher/k3s/kubelet.yaml.j2

@@ -0,0 +1,6 @@
+#jinja2: lstrip_blocks: True
+---
+apiVersion: kubelet.config.k8s.io/v1beta1
+kind: KubeletConfiguration
+shutdownGracePeriod: 30s
+shutdownGracePeriodCriticalPods: 10s