GlusterFS

Description

GlusterFS is a scalable network filesystem. Using common off-the-shelf hardware, you can create large, distributed storage solutions for media streaming, data analysis, and other data- and bandwidth-intensive tasks. GlusterFS is free and open source software.

This cookbook focuses on deploying a GlusterFS cluster via Chef.

Requirements

Cookbooks and gems

Declared in metadata.rb and in Gemfile.

Platforms

A systemd managed distribution:

• RHEL Family 7, tested on Centos 7.2

Usage

Easy Setup

Set node['glusterfs']['hosts'] to an array containing the hostnames of the nodes of the GlusterFS cluster.

Search

The recommended way to use this cookbook is through the creation of a role per glusterfs cluster. This enables the search by role feature, allowing a simple service discovery.

In fact, there are two ways to configure the search:

1. with a static configuration through a list of hostnames (attributes hosts that is ['glusterfs']['hosts'])
2. with a real search, performed on a role (attributes role and size like in ['glusterfs']['role']). The role should be in the run-list of all nodes of the cluster. The size is a safety and should be the number of nodes in the cluster.

If hosts is configured, role and size are ignored

See roles for some examples and [Cluster Search][cluster-search] documentation for more information.

Test

This cookbook is fully tested through the installation of a working 3-nodes cluster in docker hosts. This uses kitchen (>= 1.5.0), docker (>= 1.10) and a small monkey-patch.

At the moment, the docker images are run in privileged mode which is highly insecure. This is needed by GlusterFS to mount volumes. You are invited to check the image used (sbernard/centos-systemd-kitchen) for the tests before running them.

For more information, see .kitchen.yml and test directory.

Attributes

Configuration is done by overriding default attributes. All configuration keys have a default defined in attributes/default.rb. Please read it to have a comprehensive view of what and how you can configure this cookbook behavior.

Recipes

• default
• repository (setup yum repositories)
• package (install glusterfs-server)
• service (make sure glusterd service is enabled and started)
• configure (probe an host into the cluster and create a volume)
• client (mount a glusterfs volume)

Setting Up Clients

Permit access to GlusterFS volumes using Gluster Native Client method

Example

"glusterfs": {
  "mounts": {
    "myvol": {
      "mount_point": "/mnt/data",
      "server": "host1.example"
    }
  }
}

It creates a mount point on the local filesystem at /mnt/data using GlusterFS fuse client.

Resources/Providers

Probe

Probe an host into the GlusterFS cluster.

Example

glusterfs_probe 'my-custom-host.test'

Volume

Create a GlusterFS volume

Example

Creation of a replicated volume with two storage servers

"glusterfs": {
  "volumes": {
    "myvol": {
      "type": "replica",
      "count": 2,
      "transport_type": "tcp",
      "mount_points": [[
        "host1.example:/mnt/brick1",
        "host2.example:/mnt/brick2",
      ]],
      "action": [["create", "start"]]
    }
  }
}

Changelog

Available in CHANGELOG.md.

Contributing

Please read carefully CONTRIBUTING.md before making a merge request.

License and Author

• Author:: Samuel Bernard (samuel.bernard@s4m.io)
• Author:: Florian Philippon (florian.philippon@s4m.io)

Copyright (c) 2016 Sam4Mobile

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.