Components of Piranha Cluster Software: IPVS kernel, lvs (manage the IPVS routing table via the ipvsadm tool), nanny (monitor servers & services on real servers in a cluster), pulse t(control the other daemons and handle failovers between IPVS routing boxes).
Our load balancing will be done using 2 Linux Virtual Server Nodes. We will install Piranha for doing that.
We will install two or more Web servers as well as to install two database server nodes for high availability. MySQL will be installed as a database server and we will install and configure Heartbeat and DRBD (Distributed Replicated Block Device).
1 – First of all stop all the services that we don’t need to run on the nodes.
2 - We will modify our hosts configuration file at /etc/hosts on each of the nodes in our setup or you can simply copy paste the configuration in the hosts file.
3 – After copying to host file to all the nodes, we need to generate SSH keys.
4 – Now we will check Network Time Protocol configuration in order to make sure the ntp service is installed.
Type :wq to save and quit the ntp.conf file.
5 – Now we will configure client side configuration in ntp.conf.
Copy the same configuration or the file /etc/ntp.conf to other four nodes webnode01, webnode02, dbnode01, dbnode02. After copying restart the ntp service on these nodes.
6 – Now we will setup our Linux Virtual Server by installing Piranha package. We will perform the configuration on lbnode01 and lbnode02. We would just like to recall that Piranha includes ipvsadm, nanny and pulse demon.
We will use Yum the sophisticated Linux package manager to install Piranha on the both nodes.
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Type :wq to save and exit.
Now we will copy this configuration file to lbnode02.
We will start httpd on both web servers.
Feb 13 19:43:11 lbnode01 avahi-daemon: Registering new address record for 192.168.0.3 on eth0.
Now we can see from the output everything is working fine.
7 – Now we will install and configure our web servers, php, and arptables_jf package for direct routing.
Now we will configure the loopback interfaces on both web server nodes.
Now we will do it on the second web server node.
Now we will configure our arptables on our first web server node.
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We will configure local interfaces to be enabled at boot time.
We have managed to setup our lvs and webserver nodes now its time to test if everything is working find up to now.
8 – Now we will configure our both database nodes and we will install DRBD and Heartbeat on both servers.
First we need to configure the partitions on both servers. We have 4GB disks on both servers and we will create LVM partitions on that using fdisk utility.
Now we will create the physical volume for LVM partition.
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9 - We need to do the same for dbnode02. Once done with the partition, now its time to install DRBD.
Lets configure drbd.conf file as following.
The following command will be done at our primary node.
Now we will create /data dir into dbnode02.
We will install heartbeat package by using Yum .
Type :wq to save and quit.
if you have problem mounting /dev/drbd0 on /data then run these commands to check the status if you found the drbddisk stopped then start it.
10 - Now the final part is to install Joomla on our web servers.
[[email protected] html]# cd ..
Host 192.168.0.100 IP use MySQL as database.