Rework Role Structure (#254)

* Add more defaults
* Rename roles, covert download to airgap role
* Remove unnecessary gather_facts

Signed-off-by: Derek Nola <derek.nola@suse.com>

roles/k3s_agent/defaults/main.yml

@@ -0,0 +1,4 @@
+---
+k3s_server_location: "/var/lib/rancher/k3s"
+systemd_dir: "/etc/systemd/system"
+api_port: 6443

roles/k3s_agent/tasks/main.yml

@@ -0,0 +1,36 @@
+---
+# If airgapped, all K3s artifacts are already on the node.
+- name: Download K3s install script
+  when: airgap_dir is undefined
+  ansible.builtin.get_url:
+    url: https://get.k3s.io/
+    timeout: 120
+    dest: /usr/local/bin/k3s-install.sh
+    owner: root
+    group: root
+    mode: 0755
+
+- name: Download K3s binary
+  when: airgap_dir is undefined
+  ansible.builtin.command:
+    cmd: /usr/local/bin/k3s-install.sh
+  environment:
+    INSTALL_K3S_SKIP_START: "true"
+    INSTALL_K3S_VERSION: "{{ k3s_version }}"
+    INSTALL_K3S_EXEC: "agent"
+  changed_when: true
+
+- name: Copy K3s service file
+  ansible.builtin.template:
+    src: "k3s-agent.service.j2"
+    dest: "{{ systemd_dir }}/k3s-agent.service"
+    owner: root
+    group: root
+    mode: 0755
+
+- name: Enable and check K3s service
+  ansible.builtin.systemd:
+    name: k3s-agent
+    daemon_reload: true
+    state: started
+    enabled: true

roles/k3s_agent/templates/k3s-agent.service.j2

@@ -0,0 +1,29 @@
+[Unit]
+Description=Lightweight Kubernetes
+Documentation=https://k3s.io
+Wants=network-online.target
+After=network-online.target
+
+[Install]
+WantedBy=multi-user.target
+
+[Service]
+Type=notify
+EnvironmentFile=-/etc/default/%N
+EnvironmentFile=-/etc/sysconfig/%N
+EnvironmentFile=-/etc/systemd/system/k3s.service.env
+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
+ExecStartPre=/bin/sh -xc '! /usr/bin/systemctl is-enabled --quiet nm-cloud-setup.service'
+ExecStartPre=-/sbin/modprobe br_netfilter
+ExecStartPre=-/sbin/modprobe overlay
+ExecStart=/usr/local/bin/k3s agent --data-dir {{ k3s_server_location }} --server https://{{ api_endpoint }}:{{ api_port }} --token {{ token }} {{ extra_agent_args }}