Creates a glusterfs role

Works by turning all peers into members of all defined volumes
and any machine that isn't in the peers list mounts the
gluster share from the primary peer.

playbooks/roles/gluster/defaults/main.yml

+gluster_primary_ip: 127.0.0.1
+gluster_peers: 
+gluster_volumes:
+  - path: /mnt/gfsv0
+    name: gfsv0
+    replicas: 2
+    cache_size: 128MB
+    security: "*"
+    mount_location: /mnt/data

playbooks/roles/gluster/tasks/main.yml

+---
+# Install and configure simple glusterFS shared storage
+
+- name: gluster | all | Install common packages
+  apt: name={{ item }} state=present
+  with_items:
+    - glusterfs-client
+    - glusterfs-common
+    - nfs-common
+  tags: gluster
+
+- name: gluster | all | Install server packages
+  apt: name=glusterfs-server state=present
+  when: >
+    "{{ ansible_default_ipv4.address }}" "{{ gluster_peers|join(' ') }}"
+  tags: gluster
+
+- name: gluster | all | enable server
+  service: name=glusterfs-server state=restarted enabled=yes
+  when: >
+    "{{ ansible_default_ipv4.address }}" in "{{ gluster_peers|join(' ') }}"
+  tags: gluster
+
+# Ignoring error below so that we can move the data folder and have it be a link
+- name: gluster | all | create folders
+  file: path={{ item.path }} state=directory
+  with_items: gluster_volumes
+  when: >
+    "{{ ansible_default_ipv4.address }}" in "{{ gluster_peers|join(' ') }}"  
+  ignore_errors: yes
+  tags: gluster
+
+- name: gluster | primary | create peers
+  command: gluster peer probe {{ item }}
+  with_items: gluster_peers
+  when: ansible_default_ipv4.address == gluster_primary_ip
+  tags: gluster
+
+- name: gluster | primary | create volumes
+  command: gluster volume create {{ item.name }} replica {{ item.replicas }} transport tcp {% for server in gluster_peers %}{{ server }}:{{ item.path }} {% endfor %}
+  with_items: gluster_volumes
+  when: ansible_default_ipv4.address == gluster_primary_ip
+  ignore_errors: yes # There should be better error checking here
+  tags: gluster
+
+- name: gluster | primary | start volumes
+  command: gluster volume start {{ item.name }}
+  with_items: gluster_volumes
+  when: ansible_default_ipv4.address == gluster_primary_ip
+  ignore_errors: yes # There should be better error checking here
+  tags: gluster
+  
+- name: gluster | primary | set security
+  command: gluster volume set {{ item.name }} auth.allow {{ item.security }}
+  with_items: gluster_volumes
+  when: ansible_default_ipv4.address == gluster_primary_ip
+  tags: gluster
+
+- name: gluster | primary | set performance cache
+  command: gluster volume set {{ item.name }} performance.cache-size {{ item.cache_size }}
+  with_items: gluster_volumes
+  when: ansible_default_ipv4.address == gluster_primary_ip
+  tags: gluster
+  
+- name: gluster | all | mount volume
+  mount: >
+    name={{ item.mount_location }}
+    src={{ gluster_primary_ip }}:{{ item.name }}
+    fstype=glusterfs
+    state=mounted
+    opts=defaults,_netdev
+  with_items: gluster_volumes
+  tags: gluster
+  
+# This required due to an annoying bug in Ubuntu and gluster where it tries to mount the system
+# before the network stack is up and can't lookup 127.0.0.1
+- name: gluster | all | sleep mount
+  lineinfile: >
+    dest=/etc/rc.local
+    line='sleep 5; /bin/mount -a'
+    regexp='sleep 5; /bin/mount -a'
+    insertbefore='exit 0'
+  tags: gluster