GlusterFS ?
GlusterFS is an open source network / cluster filesystem and based on a stackable user space design.In this tutorials we will achieve high availability of storage(i.e real time replication of files) across two linux machines using GlusterFS. Although glusterfs found its application in different areas like cloud computing, streaming media services, and content delivery networks. In this tutorials we will use the term brick (It is the storage filesystem that has been assigned to a volume).
In Our case , we are using two Centos 6.2 Machines and Using glusterfs static files of Apache document root (/var/www/html) will be replicated across these machine. Follow the below steps to achieve this…
Step:1 Enable EPEL Repository on both the nodes
# yum -y install http://download.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
Step: Enable glusterfs repository on both nodes
# wget -P /etc/yum.repos.d http://download.gluster.org/pub/gluster/glusterfs/LATEST/EPEL.repo/glusterfs-epel.repo
Step:3 Install All the necessary Packages using yum on both the nodes
# yum -y install pyxattr python-webob1.0 python-paste-deploy1.5 python-sphinx10 git autoconf automake bison dos2unix flex fuse-devel libaio-devel libibverbs-devel libtool libxml2-devel lvm2-devel make openssl-devel pkgconfig python-devel python-eventlet python-netifaces python-paste-deploy python-simplejson python-sphinx python-webob readline-devel rpm-build systemtap-sdt-devel tar
Step:4 Install the GlusterFS software on both nodes
# yum install glusterfs{-fuse,-server}
# yum install xfsdump xfsprogs
Step:5 Start glusterfs service on both the nodes
# /etc/init.d/glusterd start ; chkconfig glusterd on
Step:6 Add fuse module to Linux core for GlusterClient on both the nodes.
# /sbin/modprobe fuse
To make it work after restart of server
# echo "modprobe fuse" > /etc/sysconfig/modules/fuse.modules # chmod +x /etc/sysconfig/modules/fuse.modules
Step:7 Add Both nodes on trusted storage .
On 'site1.nextstep4it.com' , run below command .
#gluster peer probe site2.nextstep4it.com
On 'Site2.nextstep4it.com' , run below command
# gluster peer probe site1.nextstep4it.com
Note: If we are using firewall, make sure TCP ports 111, 24007, 24008, 24009 are open on site1.nextstep4it.com and site2.nextstep4it.com
To Check status of trusted storage using below command :
Step:8 Create the below directory on both nodes.
# mkdir -p /opt/gfs-data
On Master Node : site1.nextstep4it.com , Run below command
# gluster volume create apache replica 2 site1.nextstep4it.com:/opt/gfs-data site2.nextstep4it.com:/opt/gfs-data
Step:9 Now start the volume on both the nodes :
# gluster volume start apache
Now Mount volumes on site1.nextstep4it.com :
# mount.glusterfs site1.nextstep4it.com:/apache /var/www/html
Also Mount the Volume on site2.nextstep4it.com :
# mount.glusterfs site2.nextstep4it:/apache /var/www/html
For the Permanent Mount add below entry in the /etc/fstab file.
site1.nextstep4it.com:/apache /var/www/html glusterfs defaults,_netdev 0 0
Step:10 Testing of File replications
Go To /var/www/html folders , modify the files from 'site1.nextstep4it.com' check whether the changes are reflected on another node 'site2.nextstep4it.com'.
