Installing GlusterFS - a Quick Start Guide

Purpose of this document

This document is intended to provide a step-by-step guide to setting up GlusterFS for the first time. For the purposes of this guide, it is required to use Fedora 26 (or, higher) virtual machine instances.

After you deploy GlusterFS by following these steps, we recommend that you read the GlusterFS Admin Guide to learn how to administer GlusterFS and how to select a volume type that fits your needs. Read the GlusterFS Install Guide for a more detailed explanation of the steps we took here. We want you to be successful in as short a time as possible.

If you would like a more detailed walkthrough with instructions for installing using different methods (in local virtual machines, EC2 and baremetal) and different distributions, then have a look at the Install guide.

Using Ansible to deploy and manage GlusterFS

If you are already an Ansible user, and are more comfortable with setting up distributed systems with Ansible, we recommend you to skip all these and move over to gluster-ansible repository, which gives most of the details to get the systems running faster.

Deploying GlusterFS with GlusterD2, the next gen management interface of Gluster

While GlusterD2 project continues to be under active development, contributors can start by setting up the cluster to understand the aspect of peer and volume management.Please refer to GD2 quick start guide here. Feedback on the new CLI and the ReST APIs are welcome at gluster-users@gluster.org & gluster-devel@gluster.org.

Automatically deploying GlusterFS with Puppet-Gluster+Vagrant

To deploy GlusterFS using scripted methods, please read this article.

Step 1 – Have at least three nodes

  • Fedora 26 (or later) on 3 nodes named "server1", "server2" and "server3"
  • A working network connection
  • At least two virtual disks, one for the OS installation, and one to be used to serve GlusterFS storage (sdb), on each of these VMs. This will emulate a real-world deployment, where you would want to separate GlusterFS storage from the OS install.
  • Setup NTP on each of these servers to get the proper functioning of many applications on top of filesystem.

Note: GlusterFS stores its dynamically generated configuration files at /var/lib/glusterd. If at any point in time GlusterFS is unable to write to these files (for example, when the backing filesystem is full), it will at minimum cause erratic behavior for your system; or worse, take your system offline completely. It is recommended to create separate partitions for directories such as /var/log to reduce the chances of this happening.

Step 2 - Format and mount the bricks

Perform this step on all the nodes, "server{1,2,3}"

Note: We are going to use the XFS filesystem for the backend bricks. But Gluster is designed to work on top of any filesystem, which supports extended attributes.

The following examples assume that the brick will be residing on /dev/sdb1.

    mkfs.xfs -i size=512 /dev/sdb1
    mkdir -p /data/brick1
    echo '/dev/sdb1 /data/brick1 xfs defaults 1 2' >> /etc/fstab
    mount -a && mount

You should now see sdb1 mounted at /data/brick1

Step 3 - Installing GlusterFS

Install the software

    yum install glusterfs-server

Start the GlusterFS management daemon:

    service glusterd start
    service glusterd status
    glusterd.service - LSB: glusterfs server
           Loaded: loaded (/etc/rc.d/init.d/glusterd)
       Active: active (running) since Mon, 13 Aug 2012 13:02:11 -0700; 2s ago
      Process: 19254 ExecStart=/etc/rc.d/init.d/glusterd start (code=exited, status=0/SUCCESS)
       CGroup: name=systemd:/system/glusterd.service
           ├ 19260 /usr/sbin/glusterd -p /run/glusterd.pid
           ├ 19304 /usr/sbin/glusterfsd --xlator-option georep-server.listen-port=24009 -s localhost...
           └ 19309 /usr/sbin/glusterfs -f /var/lib/glusterd/nfs/nfs-server.vol -p /var/lib/glusterd/...

Step 4 - Configure the firewall

The gluster processes on the nodes need to be able to communicate with each other. To simplify this setup, configure the firewall on each node to accept all traffic from the other node.

            iptables -I INPUT -p all -s <ip-address> -j ACCEPT

where ip-address is the address of the other node.

Step 5 - Configure the trusted pool

From "server1"

    gluster peer probe server2
    gluster peer probe server3

Note: When using hostnames, the first server needs to be probed from one other server to set its hostname.

From "server2"

    gluster peer probe server1

Note: Once this pool has been established, only trusted members may probe new servers into the pool. A new server cannot probe the pool, it must be probed from the pool.

Check the peer status on server1

            gluster peer status

You should see something like this (the UUID will differ)

            Number of Peers: 2

            Hostname: server2
            Uuid: f0e7b138-4874-4bc0-ab91-54f20c7068b4
            State: Peer in Cluster (Connected)

            Hostname: server3
            Uuid: f0e7b138-4532-4bc0-ab91-54f20c701241
            State: Peer in Cluster (Connected)

Step 6 - Set up a GlusterFS volume

On all servers:

    mkdir -p /data/brick1/gv0

From any single server:

    gluster volume create gv0 replica 3 server1:/data/brick1/gv0 server2:/data/brick1/gv0 server3:/data/brick1/gv0
    gluster volume start gv0

Confirm that the volume shows "Started":

    gluster volume info

You should see something like this (the Volume ID will differ):

            Volume Name: gv0
            Type: Replicate
            Volume ID: f25cc3d8-631f-41bd-96e1-3e22a4c6f71f
            Status: Started
            Snapshot Count: 0
            Number of Bricks: 1 x 3 = 3
            Transport-type: tcp
            Bricks:
            Brick1: server1:/data/brick1/gv0
            Brick2: server2:/data/brick1/gv0
            Brick3: server3:/data/brick1/gv0
            Options Reconfigured:
            transport.address-family: inet

Note: If the volume does not show "Started", the files under /var/log/glusterfs/glusterd.log should be checked in order to debug and diagnose the situation. These logs can be looked at on one or, all the servers configured.

Step 7 - Testing the GlusterFS volume

For this step, we will use one of the servers to mount the volume. Typically, you would do this from an external machine, known as a "client". Since using this method would require additional packages to be installed on the client machine, we will use one of the servers as a simple place to test first , as if it were that "client".

    mount -t glusterfs server1:/gv0 /mnt
      for i in `seq -w 1 100`; do cp -rp /var/log/messages /mnt/copy-test-$i; done

First, check the client mount point:

    ls -lA /mnt/copy* | wc -l

You should see 100 files returned. Next, check the GlusterFS brick mount points on each server:

    ls -lA /data/brick1/gv0/copy*

You should see 100 files on each server using the method we listed here. Without replication, in a distribute only volume (not detailed here), you should see about 33 files on each one.