There is a new version of this tutorial available for Ubuntu 12.10 (Quantal Quetzal).

High-Availability Storage With GlusterFS 3.2.x On Ubuntu 11.10 - Automatic File Replication (Mirror) Across Two Storage Servers

Version 1.0
Author: Falko Timme
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This tutorial shows how to set up a high-availability storage with two storage servers (Ubuntu 11.10) that use GlusterFS. Each storage server will be a mirror of the other storage server, and files will be replicated automatically across both storage servers. The client system (Ubuntu 11.10 as well) will be able to access the storage as if it was a local filesystem. GlusterFS is a clustered file-system capable of scaling to several peta-bytes. It aggregates various storage bricks over Infiniband RDMA or TCP/IP interconnect into one large parallel network file system. Storage bricks can be made of any commodity hardware such as x86_64 servers with SATA-II RAID and Infiniband HBA.

I do not issue any guarantee that this will work for you!


1 Preliminary Note

In this tutorial I use three systems, two servers and a client:

  • IP address (server)
  • IP address (server)
  • IP address (client)

Because we will run all the steps from this tutorial with root privileges, we can either prepend all commands in this tutorial with the string sudo, or we become root right now by typing

sudo su

All three systems should be able to resolve the other systems' hostnames. If this cannot be done through DNS, you should edit the /etc/hosts file so that it looks as follows on all three systems:

vi /etc/hosts       localhost.localdomain   localhost     server1     server2     client1

# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts

(It is also possible to use IP addresses instead of hostnames in the following setup. If you prefer to use IP addresses, you don't have to care about whether the hostnames can be resolved or not.)


2 Setting Up The GlusterFS Servers

GlusterFS is available as a package for Ubuntu 11.10, therefore we can install it as follows:

apt-get install glusterfs-server

The command

glusterfsd --version

should now show the GlusterFS version that you've just installed (3.2.1 in this case):

[email protected]:~# glusterfsd --version
glusterfs 3.2.1 built on Jun 28 2011 07:43:56
Repository revision: v3.2.1
Copyright (c) 2006-2010 Gluster Inc. <>
You may redistribute copies of GlusterFS under the terms of the GNU Affero General Public License.
[email protected]:~#

If you use a firewall, ensure that TCP ports 111, 24007, 24008, 24009-(24009 + number of bricks across all volumes) are open on and

Next we must add to the trusted storage pool (please note that I'm running all GlusterFS configuration commands from, but you can as well run them from because the configuration is repliacted between the GlusterFS nodes - just make sure you use the correct hostnames or IP addresses):

On, run

gluster peer probe

[email protected]:~# gluster peer probe
Probe successful
[email protected]:~#

The status of the trusted storage pool should now be similar to this:

gluster peer status

[email protected]:~# gluster peer status
Number of Peers: 1

Uuid: 7cd93007-fccb-4fcb-8063-133e6ba81cd9
State: Peer in Cluster (Connected)
[email protected]:~#

Next we create the share named testvol with two replicas (please note that the number of replicas is equal to the number of servers in this case because we want to set up mirroring) on and in the /data directory (this will be created if it doesn't exist):

gluster volume create testvol replica 2 transport tcp

[email protected]:~# gluster volume create testvol replica 2 transport tcp
Creation of volume testvol has been successful. Please start the volume to access data.
[email protected]:~#

Start the volume:

gluster volume start testvol

It is possible that the above command tells you that the action was not successful:

[email protected]:~# gluster volume start testvol
Starting volume testvol has been unsuccessful
[email protected]:~#

In this case you should check the output of...

netstat -tap | grep glusterfsd

on both servers.

If you get output like this...

[email protected]:~# netstat -tap | grep glusterfsd
tcp        0      0 *:24009                 *:*                     LISTEN      1548/glusterfsd
tcp        0      0 localhost.localdom:1019 localhost.localdo:24007 ESTABLISHED 1548/glusterfsd
[email protected]:~#

... everything is fine, but if you don't get any output...

[email protected]:~# netstat -tap | grep glusterfsd
[email protected]:~#

... restart the GlusterFS daemon on the corresponding server ( in this case):

/etc/init.d/glusterfs-server restart

Then check the output of...

netstat -tap | grep glusterfsd

... again on that server - it should now look like this:

[email protected]:~# netstat -tap | grep glusterfsd
tcp        0      0 *:24010                 *:*                     LISTEN      1458/glusterfsd
tcp        0      0 localhost.localdom:1021 localhost.localdo:24007 ESTABLISHED 1458/glusterfsd
[email protected]:~#

Now back to

You can check the status of the volume with the command

gluster volume info

[email protected]:~# gluster volume info

Volume Name: testvol
Type: Replicate
Status: Started
Number of Bricks: 2
Transport-type: tcp
[email protected]:~#

By default, all clients can connect to the volume. If you want to grant access to (= only, run:

gluster volume set testvol auth.allow

Please note that it is possible to use wildcards for the IP addresses (like 192.168.*) and that you can specify multiple IP addresses separated by comma (e.g.,

The volume info should now show the updated status:

gluster volume info

[email protected]:~# gluster volume info

Volume Name: testvol
Type: Replicate
Status: Started
Number of Bricks: 2
Transport-type: tcp
Options Reconfigured:
[email protected]:~#

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