Install and Configure GlusterFS on CentOS 7 / RHEL 7


Configure GlusterFS on CentOS 7:

Before creating a volume, we need to create trusted storage pool by adding gluster2.itzgeek.local. You can run GlusterFS configuration commands on any one server in the cluster will execute the same command on all other servers.

Here I will run all GlusterFS commands in gluster1.itzgeek.local node.

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[root@gluster1 ~]# gluster peer probe gluster2.itzgeek.local
peer probe: success.

Verify the status of the trusted storage pool.

[root@gluster1 ~]# gluster peer status
Number of Peers: 1

Hostname: gluster2.itzgeek.local
Uuid: cc01e4c6-ffc6-44fa-a47b-033692f151df
State: Peer in Cluster (Connected)

List the storage pool.

[root@gluster1 ~]# gluster pool list

UUID                                    Hostname                State
cc01e4c6-ffc6-44fa-a47b-033692f151df    gluster2.itzgeek.local  Connected
519b0fb8-549c-457c-b474-e6214794e02d    localhost               Connected

Setup GlusterFS Volume:

Create a brick (directory) called “gv0” in the mounted file system on both nodes.

mkdir -p /data/gluster/gv0

Since we are going to use replicated volume, so create the volume named “gv0” with two replicas.

[root@gluster1 ~]# gluster volume create gv0 replica 2 gluster1.itzgeek.local:/data/gluster/gv0 gluster2.itzgeek.local:/data/gluster/gv0
volume create: gv0: success: please start the volume to access data

Start the volume.

[root@gluster1 ~]# gluster volume start gv0
volume start: gv0: success

Check the status of the created volume.

[root@gluster1 ~]# gluster volume info gv0

Volume Name: gv0
Type: Replicate
Volume ID: c3968489-098d-4664-8b25-54827f244fbe
Status: Started
Snapshot Count: 0
Number of Bricks: 1 x 2 = 2
Transport-type: tcp
Brick1: gluster1.itzgeek.local:/data/gluster/gv0
Brick2: gluster2.itzgeek.local:/data/gluster/gv0
Options Reconfigured:
transport.address-family: inet
performance.readdir-ahead: on
nfs.disable: on

Setup GlusterFS Client:

Install glusterfs-client package to support the mounting of GlusterFS filesystems. Run all commands as root user.

$ su -

### CentOS / RHEL ###
yum install -y glusterfs-client

### Ubuntu / Debian ###
apt-get install -y glusterfs-client

Create a directory to mount the GlusterFS filesystem.

mkdir -p /mnt/glusterfs

Now, mount the GlusterFS filesystem to /mnt/glusterfs using the following command.

mount -t glusterfs gluster1.itzgeek.local:/gv0 /mnt/glusterfs

If you get any error like below.

WARNING: getfattr not found, certain checks will be skipped..
Mount failed. Please check the log file for more details.

Consider adding Firewall rules for client machine (client.itzgeek.local) to allow connections on the gluster nodes (gluster1.itzgeek.local and gluster2.itzgeek.local). Run the below command on both gluster nodes.

firewall-cmd --zone=public --add-rich-rule='rule family="ipv4" source address="clientip" accept'

You can also use gluster2.itzgeek.local instead of in the above command.

Verify the mounted GlusterFS filesystem.

root@client:~# df -hP /mnt/glusterfs
Filesystem                   Size  Used Avail Use% Mounted on
gluster1.itzgeek.local:/gv0  4.8G   21M  4.6G   1% /mnt/glusterfs

You can also use below command to verify the GlusterFS filesystem.

root@client:~# cat /proc/mounts
sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0
proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0
udev /dev devtmpfs rw,nosuid,relatime,size=480040k,nr_inodes=120010,mode=755 0 0
devpts /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0
tmpfs /run tmpfs rw,nosuid,noexec,relatime,size=99844k,mode=755 0 0
/dev/mapper/server--vg-root / ext4 rw,relatime,errors=remount-ro,data=ordered 0 0
securityfs /sys/kernel/security securityfs rw,nosuid,nodev,noexec,relatime 0 0
tmpfs /dev/shm tmpfs rw,nosuid,nodev 0 0
tmpfs /run/lock tmpfs rw,nosuid,nodev,noexec,relatime,size=5120k 0 0
tmpfs /sys/fs/cgroup tmpfs ro,nosuid,nodev,noexec,mode=755 0 0
cgroup /sys/fs/cgroup/systemd cgroup rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd 0 0
pstore /sys/fs/pstore pstore rw,nosuid,nodev,noexec,relatime 0 0
cgroup /sys/fs/cgroup/blkio cgroup rw,nosuid,nodev,noexec,relatime,blkio 0 0
cgroup /sys/fs/cgroup/cpuset cgroup rw,nosuid,nodev,noexec,relatime,cpuset 0 0
cgroup /sys/fs/cgroup/cpu,cpuacct cgroup rw,nosuid,nodev,noexec,relatime,cpu,cpuacct 0 0
cgroup /sys/fs/cgroup/hugetlb cgroup rw,nosuid,nodev,noexec,relatime,hugetlb 0 0
cgroup /sys/fs/cgroup/net_cls,net_prio cgroup rw,nosuid,nodev,noexec,relatime,net_cls,net_prio 0 0
cgroup /sys/fs/cgroup/freezer cgroup rw,nosuid,nodev,noexec,relatime,freezer 0 0
cgroup /sys/fs/cgroup/memory cgroup rw,nosuid,nodev,noexec,relatime,memory 0 0
cgroup /sys/fs/cgroup/perf_event cgroup rw,nosuid,nodev,noexec,relatime,perf_event 0 0
cgroup /sys/fs/cgroup/pids cgroup rw,nosuid,nodev,noexec,relatime,pids 0 0
cgroup /sys/fs/cgroup/devices cgroup rw,nosuid,nodev,noexec,relatime,devices 0 0
systemd-1 /proc/sys/fs/binfmt_misc autofs rw,relatime,fd=22,pgrp=1,timeout=0,minproto=5,maxproto=5,direct 0 0
debugfs /sys/kernel/debug debugfs rw,relatime 0 0
mqueue /dev/mqueue mqueue rw,relatime 0 0
hugetlbfs /dev/hugepages hugetlbfs rw,relatime 0 0
fusectl /sys/fs/fuse/connections fusectl rw,relatime 0 0
/dev/sda1 /boot ext2 rw,relatime,block_validity,barrier,user_xattr,acl 0 0
tmpfs /run/lxcfs/controllers tmpfs rw,relatime,size=100k,mode=700 0 0
devices /run/lxcfs/controllers/devices cgroup rw,relatime,devices 0 0
pids /run/lxcfs/controllers/pids cgroup rw,relatime,pids 0 0
perf_event /run/lxcfs/controllers/perf_event cgroup rw,relatime,perf_event 0 0
memory /run/lxcfs/controllers/memory cgroup rw,relatime,memory 0 0
freezer /run/lxcfs/controllers/freezer cgroup rw,relatime,freezer 0 0
net_cls,net_prio /run/lxcfs/controllers/net_cls,net_prio cgroup rw,relatime,net_cls,net_prio 0 0
hugetlb /run/lxcfs/controllers/hugetlb cgroup rw,relatime,hugetlb 0 0
cpu,cpuacct /run/lxcfs/controllers/cpu,cpuacct cgroup rw,relatime,cpu,cpuacct 0 0
cpuset /run/lxcfs/controllers/cpuset cgroup rw,relatime,cpuset 0 0
blkio /run/lxcfs/controllers/blkio cgroup rw,relatime,blkio 0 0
name=systemd /run/lxcfs/controllers/name=systemd cgroup rw,relatime,xattr,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd 0 0
lxcfs /var/lib/lxcfs fuse.lxcfs rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other 0 0
tmpfs /run/user/1000 tmpfs rw,nosuid,nodev,relatime,size=99844k,mode=700,uid=1000,gid=1000 0 0
gluster1.itzgeek.local:/gv0 /mnt/glusterfs fuse.glusterfs rw,relatime,user_id=0,group_id=0,default_permissions,allow_other,max_read=131072 0 0

Add below entry to /etc/fstab for automatically mounting during system boot.

gluster1.itzgeek.local:/gv0 /mnt/glusterfs glusterfs  defaults,_netdev 0 0

Test GlusterFS Replication and High-Availability:

GlusterFS Server Side:

To check the replication, mount the created GlusterFS volume on the same storage node.

[root@gluster1 ~]# mount -t glusterfs gluster2.itzgeek.local:/gv0 /mnt
[root@gluster2 ~]# mount -t glusterfs gluster1.itzgeek.local:/gv0 /mnt

Data inside the /mnt directory of both nodes will always be same (replication).

GlusterFS Client Side:

Let’s create some files on the mounted filesystem on the client.itzgeek.local.

touch /mnt/glusterfs/file1
touch /mnt/glusterfs/file2

Verify the created files.

root@client:~# ls -l /mnt/glusterfs/
total 0
-rw-r--r-- 1 root root 0 Sep 28 05:23 file1
-rw-r--r-- 1 root root 0 Sep 28 05:23 file2

Test the both GlusterFS nodes whether they have same data inside /mnt.

[root@gluster1 ~]# ls -l /mnt/
total 0
-rw-r--r--. 1 root root 0 Sep 27  2016 file1
-rw-r--r--. 1 root root 0 Sep 27  2016 file2

[root@gluster2 ~]# ls -l /mnt/
total 0
-rw-r--r--. 1 root root 0 Sep 27 16:53 file1
-rw-r--r--. 1 root root 0 Sep 27 16:53 file2

As you know, we have mounted GlusterFS volume from gluster1.itzgeek.local on client.itzgeek.local, now it is the time to test the high-availability of the volume by shutting down the node.

[root@gluster1 ~]# poweroff

Now test the availability of the files, you would see files that we created recently even though the node is down.

root@client:~# ls -l /mnt/glusterfs/
total 0
-rw-r--r-- 1 root root 0 Sep 28 05:23 file1
-rw-r--r-- 1 root root 0 Sep 28 05:23 file2
You may experience slowness in executing commands on the mounted GlusterFS filesystem is due to GlusterFS switchover to gluster2.itzgeek.local when the client.itzgeek.local can not reach gluster1.itzgeek.local.

Create some more files on the GlusterFS filesystem to check the replication.

touch /mnt/glusterfs/file3
touch /mnt/glusterfs/file4

Verify the files count.

root@client:~# ls -l /mnt/glusterfs/
total 0
-rw-r--r-- 1 root root 0 Sep 28 05:23 file1
-rw-r--r-- 1 root root 0 Sep 28 05:23 file2
-rw-r--r-- 1 root root 0 Sep 28 05:28 file3
-rw-r--r-- 1 root root 0 Sep 28 05:28 file4

Since the gluster1 is down, all your data’s are now written on gluster2.itzgeek.local due to High-Availability. Now power on the node1 (gluster1.itzgeek.local).

Check the /mnt of the gluster1.itzgeekk.local; you should see all four files in the directory, this confirms the replication is working as expected.

[root@gluster1 ~]# mount -t glusterfs gluster1.itzgeek.local:/gv0 /mnt

[root@gluster1 ~]# ls -l /mnt/
total 0
-rw-r--r--. 1 root root 0 Sep 27 19:53 file1
-rw-r--r--. 1 root root 0 Sep 27 19:53 file2
-rw-r--r--. 1 root root 0 Sep 27 19:58 file3
-rw-r--r--. 1 root root 0 Sep 27 19:58 file4

That’s All.



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