r/keepalived: Deploy keepalived

[keepalived][0] is a free implementation of the Virtual Router
Redundancy Protocol (VRRP), which is a simple method for automatically
assigning an IP address to one of several potential hosts based on
certain criteria.  It is particularly useful in conjunction with a load
balancer like HAProxy, to provide layer 3 redundancy in addition to
layer 7.  We will use it for both the reverse proxy for the public
websites and the Kubernetes API server.

[0]: https://www.keepalived.org/

roles/keepalived/tasks/main.yml

@@ -0,0 +1,34 @@
+- name: ensure keepalived is installed
+  package:
+    name: keepalived
+    state: present
+  tags:
+  - install
+
+- name: ensure keepalived is configured
+  template:
+    src: keepalived.conf.j2
+    dest: /etc/keepalived/keepalived.conf
+    owner: root
+    group: root
+    mode: u=rw,go=r
+  notify: reload keepalived
+  tags:
+  - config
+
+- name: flush handlers
+  meta: flush_handlers
+
+- name: ensure keepalived starts at boot
+  service:
+    name: keepalived
+    enabled: true
+  tags:
+  - service
+
+- name: ensure keepalived is running
+  service:
+    name: keepalived
+    state: started
+  tags:
+  - service