In this article, we are going to see how to setup the Linux-HA on 2 node clusters. Here I’m not going to explain the concept of HA, installation and configuration steps only.

As we are going to implement two node cluster, we need the minimum hardware configuration as below.

Cluster Server:

OS: Redhat Enterprise Linux - 6.5 ( x64 )
Hardware: Oracle VirtualBox ( 1 CPU / 1GB RAM / 2 NIC Cards / 3 HDD with 20GB )
Hostname: cluster.example.com
IP Address: 192.168.1.100/24

Node 1:

OS : Redhat Enterprise Linux - 6.5 ( x64 )
Hardware: Oracle VirtualBox ( 1 CPU / 512MB RAM / 2 NIC Cards / 1 HDD with 20GB )
Hostname: cnode1.example.com
IP Address: 192.168.1.201/24

Node 2:

OS : Redhat Enterprise Linux - 6.5 ( x64 )
Hardware: Oracle VirtualBox ( 1 CPU / 512MB RAM / 2 NIC Cards / 1 HDD with 20GB )
Hostname: cnode2.example.com
IP Address: 192.168.1.202/24

Step 1: Yum Server Configuration

Mount the CD-ROM to /mnt filesystem

[root@cluster ~]# mount -t iso9660 /dev/sr0 /mnt/
mount: block device /dev/sr0 is write-protected, mounting read-only

Install the required packages

[root@cluster ~]# cd /mnt/Packages/

[root@cluster Packages]# rpm -ivh deltarpm-3.5-0.5.20090913git.el6.x86_64.rpm
warning: deltarpm-3.5-0.5.20090913git.el6.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID fd431d51: NOKEY
Preparing... ########################################### [100%]
1:deltarpm ########################################### [100%]

[root@cluster Packages]# rpm -ivh python-deltarpm-3.5-0.5.20090913git.el6.x86_64.rpm
warning: python-deltarpm-3.5-0.5.20090913git.el6.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID fd431d51: NOKEY
Preparing... ########################################### [100%]
1:python-deltarpm ########################################### [100%]

[root@cluster Packages]# rpm -ivh createrepo-0.9.9-18.el6.noarch.rpm
warning: createrepo-0.9.9-18.el6.noarch.rpm: Header V3 RSA/SHA256 Signature, key ID fd431d51: NOKEY
Preparing... ########################################### [100%]
1:createrepo ########################################### [100%]

[root@cluster Packages]# rpm -ivh vsftpd-2.2.2-11.el6_4.1.x86_64.rpm
warning: vsftpd-2.2.2-11.el6_4.1.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID fd431d51: NOKEY
Preparing... ########################################### [100%]
1:vsftpd ########################################### [100%]


[root@cluster ~]# /etc/init.d/iptables stop
iptables: Setting chains to policy ACCEPT: filter [ OK ]
iptables: Flushing firewall rules: [ OK ]
iptables: Unloading modules: [ OK ]

[root@cluster ~]# /etc/init.d/ip6tables stop
ip6tables: Setting chains to policy ACCEPT: filter [ OK ]
ip6tables: Flushing firewall rules: [ OK ]
ip6tables: Unloading modules: [ OK ]

[root@cluster ~]# chkconfig iptables off
[root@cluster ~]# chkconfig ip6tables off
[root@cluster ~]# chkconfig vsftpd on

Copy the DVD files to /var/ftp/pub/ directory to setup local yum server

[root@cluster ~]# cp -r /mnt/* /var/ftp/pub/

Create the YUM Repository

[root@cluster ~]# createrepo -v /var/ftp/pub/
Spawning worker 0 with 3763 pkgs
..
..
Sqlite DBs complete

[root@cluster ~]# vi /etc/yum.repos.d/rhel-source.repo

Edit the baseurl and enabled lines as below

baseurl=file:///var/ftp/pub/
enabled=1

Check the YUM repository

[root@cluster ~]# yum clean all
Loaded plugins: product-id, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
Cleaning repos: rhel-source
Cleaning up Everything


[root@cluster ~]# yum repolist
Loaded plugins: product-id, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
rhel-source | 2.9 kB 00:00 ...
rhel-source/primary_db | 3.2 MB 00:00 ...
repo id repo name status
rhel-source Red Hat Enterprise Linux 6Server - x86_64 - Source 3,763
repolist: 3,763

Step 2: Install and configure ISCSI target

[root@cluster ~]# yum -y install scsi-target-utils

[root@cluster ~]# mkdir -p /etc/tgt/mytargets/

[root@cluster ~]# fdisk -l | grep /dev/sd
Disk /dev/sda: 26.8 GB, 26843545600 bytes
/dev/sda1 * 1 64 512000 83 Linux
/dev/sda2 64 3264 25701376 8e Linux LVM
Disk /dev/sdb: 5368 MB, 5368709120 bytes
Disk /dev/sdc: 5368 MB, 5368709120 bytes

Here we are going to use /dev/sdb and /dev/sdc as shared storage pool.

[root@cluster ~]# vi /etc/tgt/mytargets/san.conf
<target iqn.2015-09.com.tcs:hawebdisk>
backing-store /dev/sdb
</target>
<target iqn.2015-09.com.tcs:haqdisk>
backing-store /dev/sdc
</target>

[root@cluster ~]# vi /etc/tgt/targets.conf

Change the below line

From:

#include /etc/tgt/temp/*.conf

To:

include /etc/tgt/mytargets/*.conf

Start the iSCSI target service

[root@cluster ~]# /etc/init.d/tgtd start
Starting SCSI target daemon: [ OK ]

[root@cluster ~]# chkconfig tgtd on

Check whether iSCSI target is working or not.

[root@cluster ~]# tgtadm --mode target --op show | grep /dev/sd
Backing store path: /dev/sdc
Backing store path: /dev/sdb

Step 3: Install luci package

[root@cluster ~]# yum -y install luci

[root@cluster ~]# /etc/init.d/luci start
Adding following auto-detected host IDs (IP addresses/domain names), corresponding to `cluster.example.com' address, to the configuration of self-managed certificate `/var/lib/luci/etc/cacert.config' (you can change them by editing `/var/lib/luci/etc/cacert.config', removing the generated certificate `/var/lib/luci/certs/host.pem' and restarting luci):
(none suitable found, you can still do it manually as mentioned above)
Generating a 2048 bit RSA private key
writing new private key to '/var/lib/luci/certs/host.pem'
Starting saslauthd: [ OK ]
Start luci... [ OK ]
Point your web browser to https://cluster.example.com:8084 (or equivalent) to access luci

[root@cluster ~]# chkconfig luci on

Now you can open CONGA console in web browser. Type https://ipaddress:8084 (more…)