adds glusterfs role for ansible.

roles/glusterfs/README.md

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+# Ansible Role: GlusterFS
+
+[![Build Status](https://travis-ci.org/geerlingguy/ansible-role-glusterfs.svg?branch=master)](https://travis-ci.org/geerlingguy/ansible-role-glusterfs)
+
+Installs and configures GlusterFS on Linux.
+
+## Requirements
+
+For GlusterFS to connect between servers, TCP ports `24007`, `24008`, and `24009`/`49152`+ (that port, plus an additional incremented port for each additional server in the cluster; the latter if GlusterFS is version 3.4+), and TCP/UDP port `111` must be open. You can open these using whatever firewall you wish (this can easily be configured using the `geerlingguy.firewall` role).
+
+This role performs basic installation and setup of Gluster, but it does not configure or mount bricks (volumes), since that step is easier to do in a series of plays in your own playbook. Ansible 1.9+ includes the [`gluster_volume`](https://docs.ansible.com/gluster_volume_module.html) module to ease the management of Gluster volumes.
+
+## Role Variables
+
+Available variables are listed below, along with default values (see `defaults/main.yml`):
+
+    glusterfs_default_release: ""
+
+You can specify a `default_release` for apt on Debian/Ubuntu by overriding this variable. This is helpful if you need a different package or version for the main GlusterFS packages (e.g. GlusterFS 3.5.x instead of 3.2.x with the `wheezy-backports` default release on Debian Wheezy).
+
+    glusterfs_ppa_use: yes
+    glusterfs_ppa_version: "3.5"
+
+For Ubuntu, specify whether to use the official Gluster PPA, and which version of the PPA to use. See Gluster's [Getting Started Guide](http://www.gluster.org/community/documentation/index.php/Getting_started_install) for more info.
+
+## Dependencies
+
+None.
+
+## Example Playbook
+
+    - hosts: server
+      roles:
+        - geerlingguy.glusterfs
+
+For a real-world use example, read through [Simple GlusterFS Setup with Ansible](http://www.jeffgeerling.com/blog/simple-glusterfs-setup-ansible), a blog post by this role's author, which is included in Chapter 8 of [Ansible for DevOps](https://www.ansiblefordevops.com/).
+
+## License
+
+MIT / BSD
+
+## Author Information
+
+This role was created in 2015 by [Jeff Geerling](http://www.jeffgeerling.com/), author of [Ansible for DevOps](https://www.ansiblefordevops.com/).

roles/glusterfs/defaults/main.yml

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+---
+# For Ubuntu.
+glusterfs_default_release: ""
+glusterfs_ppa_use: yes
+glusterfs_ppa_version: "3.5"
+
+# Gluster configuration.
+gluster_mount_dir: /mnt/gluster
+gluster_volume_node_mount_dir: /mnt/xfs-drive-gluster
+gluster_brick_dir: "{{ gluster_volume_node_mount_dir }}/brick"
+gluster_brick_name: gluster

roles/glusterfs/meta/main.yml

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+---
+dependencies: []
+
+galaxy_info:
+  author: geerlingguy
+  description: GlusterFS installation for Linux.
+  company: "Midwestern Mac, LLC"
+  license: "license (BSD, MIT)"
+  min_ansible_version: 2.0
+  platforms:
+  - name: EL
+    versions:
+    - 6
+    - 7
+  - name: Ubuntu
+    versions:
+    - precise
+    - trusty
+    - xenial
+  - name: Debian
+    versions:
+    - wheezy
+    - jessie
+  galaxy_tags:
+    - system
+    - networking
+    - cloud
+    - clustering
+    - files
+    - sharing

roles/glusterfs/tasks/main.yml

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+---
+# Include variables and define needed variables.
+- name: Include OS-specific variables.
+  include_vars: "{{ ansible_os_family }}.yml"
+
+# Instal xfs package
+- name: install xfs Debian
+  apt: name=xfsprogs state=present
+  when: ansible_os_family == "Debian"
+
+- name: install xfs RedHat
+  yum: name=xfsprogs state=present
+  when: ansible_os_family == "RedHat"
+
+# Format external volumes in xfs
+- name: Format volumes in xfs
+  filesystem: fstype=xfs dev=/dev/vdb
+
+# Mount external volumes
+- name: mounting new xfs filesystem
+  mount: "name={{ gluster_volume_node_mount_dir }} src=/dev/vdb fstype=xfs state=mounted"
+
+# Setup/install tasks.
+- include: setup-RedHat.yml
+  when: ansible_os_family == 'RedHat'
+
+- include: setup-Debian.yml
+  when: ansible_os_family == 'Debian'
+
+- name: Ensure GlusterFS is started and enabled at boot.
+  service: "name={{ glusterfs_daemon }} state=started enabled=yes"
+
+- name: Ensure Gluster brick and mount directories exist.
+  file: "path={{ item }} state=directory mode=0775"
+  with_items:
+     - "{{ gluster_brick_dir }}"
+     - "{{ gluster_mount_dir }}"
+
+- name: Configure Gluster volume.
+  gluster_volume:
+        state: present
+        name: "{{ gluster_brick_name }}"
+        brick: "{{ gluster_brick_dir }}"
+        replicas: "{{ groups['gfs-cluster'] | length }}"
+        cluster: "{{ groups['gfs-cluster'] | map('extract', hostvars, ['ansible_eth0', 'ipv4', 'address']) | join(',') }}"
+        host: "{{ inventory_hostname }}"
+        force: yes
+  run_once: true
+

roles/glusterfs/tasks/setup-Debian.yml

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+---
+- name: Add PPA for GlusterFS.
+  apt_repository:
+    repo: 'ppa:gluster/glusterfs-{{ glusterfs_ppa_version }}'
+    state: present
+    update_cache: yes
+  register: glusterfs_ppa_added
+  when: glusterfs_ppa_use
+
+- name: Ensure GlusterFS will reinstall if the PPA was just added.
+  apt:
+    name: "{{ item }}"
+    state: absent
+  with_items:
+    - glusterfs-server
+    - glusterfs-client
+  when: glusterfs_ppa_added.changed
+
+- name: Ensure GlusterFS is installed.
+  apt:
+    name: "{{ item }}"
+    state: installed
+    default_release: "{{ glusterfs_default_release }}"
+  with_items:
+    - glusterfs-server
+    - glusterfs-client

roles/glusterfs/tasks/setup-RedHat.yml

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+---
+- name: Install Prerequisites
+  yum: name={{ item }}  state=present
+  with_items:
+    - "centos-release-gluster{{ glusterfs_default_release }}"
+
+- name: Install Packages
+  yum: name={{ item }}  state=present
+  with_items:
+    - glusterfs-server
+    - glusterfs-client

roles/glusterfs/tests/test.yml

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+---
+- hosts: all
+
+  roles:
+    - role_under_test

roles/glusterfs/vars/Debian.yml

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+---
+glusterfs_daemon: glusterfs-server

roles/glusterfs/vars/RedHat.yml

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+---
+glusterfs_daemon: glusterd