# How to set up high availability storage with GlusterFS on Ubuntu 18.04

- **期号**: SRE Weekly Issue #135（2018-08-19）
- **作者**: Jack Wallen — TechRepublic
- **链接**: https://www.techrepublic.com/article/how-to-set-up-high-availability-storage-with-glusterfs-on-ubuntu-18-04/

## 简介

This article goes step-by-step through setting up a 3-server GlusterFS cluster.

## 正文

![](https://assets.techrepublic.com/uploads/2016/06/datacenterhero.jpg)

Image: Jack Wallen

GlusterFS is a network file system capable of handling petabytes of data and thousands of users. For your data center Linux servers, GlusterFS might well be the file system you need for on-premises storage.

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I’m going to show you how to set up three Ubuntu servers that will represent a single namespace, using GlusterFS. I’ll be demonstrate on Ubuntu 18.04 and will assume you already have three Ubuntu Servers ready to go.

And with that said, let’s get GlusterFS up and running.

**SEE: [Quick glossary: Storage](http://b2b.cbsimg.net/downloads/TRPro/QG_storage.pdf) (Tech Pro Research)**

## The layout

I have three Ubuntu 18.04 servers at the following addresses:

- 192.168.1.206
- 192.168.1.207
- 192.168.1.208

## Mapping addresses

Open up the hosts file on each server with the command *sudo nano /etc/hosts* and then add the following (modifying to fit your IP address scheme):

`192.168.1.206 gfs01`

192.168.1.207 gfs02

192.168.1.208 gfs03

Save and close those files.

To make matters clearer, change the hostnames for each server to represent that which is mapped in the hosts file.

## Add the necessary repository

On each server, issue the following commands to add the necessary dependency, repository, and key:

`sudo apt install software-properties-common -y`

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

sudo add-apt-repository ppa:gluster/glusterfs-3.12


## Installing, starting, and enabling GlusterFS

From the terminal on gfs01 and gfs02, issue the following command to install GlusterFS:

`sudo apt install glusterfs-server -y`

Now we can start and enable GlusterFS with the commands:

`sudo systemctl start glusterd`

sudo systemctl enable glusterd

## Configure GlusterFS

The first thing to do is to create a trusted pool. This is done on gfs01 with the command:

`sudo gluster peer probe gfs02`

You should immediately see *peer probe: success.*

You can check the status of peers with the command:

`sudo gluster peer status`

You should see that 1 peer has been added (**Figure A**).

**Figure A**

![](https://assets.techrepublic.com/uploads/2018/08/glustera.jpg)


## Create a distributed GlusterFS volume

With our pool created, we must create a distributed GlusterFS volume. I would recommend creating this volume on a partition that isn’t within the system directory, otherwise sync errors may occur. Create a new directory on both gfs01 and gfs02 with the command:

`sudo mkdir -p /glusterfs/distributed`

Next we can create the volume. We’ll create a volume named v01 with replicas gfs01 and gfs02 with the command (issued on gfs01):

`sudo gluster volume create v01 replica 2 transport tcp gfs01:/glusterfs/distributed gfs02:/glusterfs/distributed`

After the distributed filesystem has been created, you need to start the volume with the command:

`sudo gluster volume start v01`
You can check the status of the volume with the command:

`sudo gluster volume info v01`

You should see the volume has been started (**Figure B**).

**Figure B**

![](https://assets.techrepublic.com/uploads/2018/08/glusterfsb.jpg)


## The GlusterFS client

We’re going to use gfs03 as our client. To install the necessary package, issue the command:

`sudo apt install glusterfs-client -y`

After the installation completes, create a mount point with the command:

`sudo mkdir -p /mnt/glusterfs`

Mount the distributed glusterfs volume with the command:

`sudo mount -t glusterfs gfs01:/v01 /mnt/glusterfs/`

Check the volume with the command:

`df -h /mnt/glusterfs`

You should see the volume has been successfully mounted (**Figure C**).

**Figure C**

![](https://assets.techrepublic.com/uploads/2018/08/glusterfsc.jpg)


To make this mount happen upon reboot, and add the following line to the gfs03 */etc/fstab* file:

`gfs01:/v01 /mnt/glusterfs glusterfs defaults,_netdev 0 0`

Now, should you have to reboot your server, the GlusterFS volume will automatically mount.

## Testing

On gsf01, issue the command:

`sudo mount -t glusterfs gfs01:/v01 /mnt`

On gsf02, issue the command:

`sudo mount -t glusterfs gfs02:/v01 /mnt`

Now go back to gfs03 and create a test file with the command:

`sudo touch /mnt/glusterfs/testing`

Go back to both gfs01 and gfs02 and issue the command:

`ls /mnt`

You should see the empty testing file created on gfs03.

At this point, any file created within the mounted volume will be automatically distributed to the nodes. You can create files on gfs01 or gfs02 at */mnt* or gfs03 at */mnt/glusterfs,* and they will automatically sync.

And that is a GlusterFS distributed file system that offers significant scaling and reliability.