added roles and playbooks for k3s

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

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