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Configuring a High-Availability Storage with GlusterFS on Ubuntu 18.04 LTS

Reviewed on 29 June 2021Published on 28 September 2018
  • glusterfs
  • network
  • filesystem

GlusterFS is an open-source, scalable network filesystem suitable for high data-intensive workloads such as media streaming, cloud storage, and CDN (Content Delivery Network). Each storage server will be a mirror of the other storage server, and files will be replicated automatically across both storage servers.

This tutorial shows you how to:

Requirements:
  • You have an account and are logged into the Scaleway Console
  • You have configured your SSH Key
  • You have three servers running on Ubuntu Bionic or Xenial
  • You have sudo privileges or access to the root user.

Configuring the Host File

The first step we need to follow before installing glusterfs on all servers is configuring the hosts’ file and add GlusterFS repository to each server.

  1. Log in to each server and edit the /etc/hosts file.

    nano /etc/hosts
  2. Paste hosts configuration below:

    ip_address gluster01ip_address gluster02ip_address client01
  3. Save and exit.

  4. Ping each server using the hostname as below:

    ping -c 3 gluster01ping -c 3 gluster02ping -c 3 client01
Note:

If the ping command is not installed by default, you can install it with the apt install iputils-ping command.

Each hostname will resolve to each server’s IP address.

--- gluster01 ping statistics ---3 packets transmitted, 3 received, 0% packet loss, time 2033msrtt min/avg/max/mdev = 0.560/0.604/0.627/0.031 ms
--- gluster02 ping statistics ---3 packets transmitted, 3 received, 0% packet loss, time 2050msrtt min/avg/max/mdev = 0.497/0.593/0.688/0.080 ms
--- client01 ping statistics ---3 packets transmitted, 3 received, 0% packet loss, time 2036msrtt min/avg/max/mdev = 0.672/0.728/0.802/0.054 ms

Adding the GlusterFS Repository

Install the software-properties-common package to all systems.

apt install software-properties-common -y

Add the glusterfs key and repository to all systems.

wget -O- https://download.gluster.org/pub/gluster/glusterfs/3.12/rsa.pub | apt-key add -add-apt-repository ppa:gluster/glusterfs-3.12

Installing a GlusterFS Server

  1. Install the glusterfs server on both gluster01 and gluster02 servers.

    apt install glusterfs-server -y
  2. Start the glusterd service and enable it to launch every time at system boot

    systemctl start glusterdsystemctl enable glusterd

    Glusterfs server is now up and running on the gluster01 and gluster02 servers.

  3. Check the services and the installed software version

    systemctl status glusterdglusterfsd --version

The command should return an active (running) status and glusterfs 3.13.2 version.

Configuring GlusterFS Servers

The next step is configuring the servers by creating a trusted storage pool and creating a distributed glusterfs volume.

  • From the gluster01 server, we need to add the gluster02 server to the glusterfs storage pool.

    gluster peer probe gluster02

    The result peer probe: success is displayed. We added the gluster02 server to the storage trusted pool.

  • Check the storage pool status and list.

    gluster peer statusgluster pool list
    root@gluster01:~# gluster peer statusNumber of Peers: 1
    Hostname: gluster02Uuid: 17e7a76f-f616-42e5-b741-63a07fd091d6State: Peer in Cluster (Connected)root@gluster01:~# gluster pool listUUID                    Hostname    State17e7a76f-f616-42e5-b741-63a07fd091d6    gluster02   Connectedecc9cafa-b25d-477e-b6bc-403c051e752d    localhost   Connected

The gluster02 server is connected to the peer cluster, and it’s on the pool list.

After creating the trusted storage pool, we will create a new distributed glusterfs volume. We will create the new glusterfs volume based on the system directory.

Setting up the Distributed GlusterFS Volume

Note:

For the server production, it’s recommended to create the glusterfs volume using the different partition, not using a system directory.

  1. Create a new directory /glusterfs/distributed on each gluster01 and gluster02 server.

    mkdir -p /glusterfs/distributed
  2. From the glusterO1 server, create a distributed glusterfs volume named ‘vol01’ with two replicas: ‘gfs01’ and ‘gfs02’

    gluster volume create vol01 transport tcp gluster01:/glusterfs/distributed gluster02:/glusterfs/distributed force
    volume create: vol01: success: please start the volume to access data
  3. Start the ‘vol01’ and check the volume info

    gluster volume start vol01gluster volume info vol01
    root@gluster01:/# gluster volume start vol01volume start: vol01: successroot@gluster01:/# gluster volume info vol01
    Volume Name: vol01Type: ReplicateVolume ID: 814b103e-522c-48d2-8d1c-3301e10f3416Status: StartedSnapshot Count: 0Number of Bricks: 1 x 2 = 2Transport-type: tcpBricks:Brick1: gluster01:/glusterfs/distributedBrick2: gluster02:/glusterfs/distributedOptions Reconfigured:transport.address-family: inetnfs.disable: onperformance.client-io-threads: off

At this stage, we created the Replicate type vol01 volume and two bricks on the gluster01 and gluster02 servers. All data will be distributed automatically to each replica server.

Configuring GlusterFS Client

In this step, we will mount the glusterfs volume vol01 to the Ubuntu client, and we need to install the glusterfs-client to the client server.

  1. Install the glusterfs-client on client01.

    apt install glusterfs-client -y
  2. Create a new directory: /mnt/glusterfs.

    mkdir -p /mnt/glusterfs
  3. Mount the distributed glusterfs volume (vol01) to the /mnt/glusterfs directory.

    mount -t glusterfs gluster01:/vol01 /mnt/glusterfs
  4. Check the amount of volume available in the system.

    df -h /mnt/glusterfs
    Note:

    To mount glusterfs permanently to the Ubuntu client system, we can add the volume to the /etc/fstab.

  5. Edit the /etc/fstab configuration file: vim /etc/fstab.

  6. Paste the following configuring:gluster01:/vol01 /mnt/glusterfs glusterfs defaults,_netdev 0 0.

  7. Save and exit.

  8. Reboot the server. When online, the glusterfs volume ‘vol01’ is mounted automatically through the fstab.

Testing Replication & Mirroring

  1. Mount the glusterfs volume vol01 to each glusterfs servers.

    • On gluster01: mount -t glusterfs gluster01:/vol01 /mnt
    • On gluster02: mount -t glusterfs gluster02:/vol01 /mnt
  2. Back on client01, go to the ‘/mnt/glusterfs’ directory.

    cd /mnt/glusterfs
  3. Create three files using the touch command.

    touch file01 file02 file03
  4. Check on each gluster01 and gluster02 that the files that we’ve created from the client machine are displayed.

    cd /mnt/ls -lah

    The gluster01 machine returns:

    root@gluster01:/mnt# ls -lahtotal 8.0Kdrwxr-xr-x  3 root root 4.0K Oct  1 15:40 .drwxr-xr-x 24 root root 4.0K Sep 28 14:11 ..-rw-r--r--  1 root root    0 Oct  1 15:40 file01-rw-r--r--  1 root root    0 Oct  1 15:40 file02-rw-r--r--  1 root root    0 Oct  1 15:40 file03

    The gluster02 machine returns:

    root@gluster02:/mnt# ls -lahtotal 8.0Kdrwxr-xr-x  3 root root 4.0K Oct  1 15:40 .drwxr-xr-x 24 root root 4.0K Sep 28 14:11 ..-rw-r--r--  1 root root    0 Oct  1 15:40 file01-rw-r--r--  1 root root    0 Oct  1 15:40 file02-rw-r--r--  1 root root    0 Oct  1 15:40 file03

As you can see, all the files we created from the client machine are distributed to all the glusterfs volume node servers.