In the upcoming chapters, you will be presented with a practical example of cluster installation and configuration. The three-node cluster used in the following example runs in a virtual environment. All virtual cluster nodes run on CentOS version 7. A 64-bit minimal installation is used to build the cluster. SELinux and IPTables are enabled and run on all cluster nodes. The virtual machines have exactly the same resource specifications, as follows:
A CPU core
768 MB RAM
A 10 GB disk
A 1 GB disk
Two network adapters
The following are the cluster nodes' fully qualified domain names:
node-1.geekpeek.net(short name: node-1)node-2.geekpeek.net(short name: node-2)node-3.geekpeek.net(short name: node-3)
Due to my virtualized environment limitations, the network IP addresses of both cluster node network interfaces are in the same network subnet—192.168.88.0/24.
The assigned static cluster node IP addresses are as follows:
192.168.88.10, 192.168.88.11:node-1.geekpeek.net192...