This post describe about how to change Hostname in your CentOS 7 or RHEL 7 using commands. Before that we need to understanding Hostname, its divided into three classes are static, pretty, and transient.

If you are still using sendmail software in system, Open your host allow file and add the below line,

Do you want to disable Firewall on your linux system there are two ways, Disable (stop) iptables, and Using setup command.

This post gives the details for creating a new partition after installed the operating system, Maximum Linux can allow to create four primary partitions only, but you can have to create much number of logical partitions dividing from one of the primary partitions.

We can easily determine whether IP Forwarding is enabled or not to execute the below command if the output will be shown 1 the IP_FORWARED is enabled in your system.

If you have forgotten the root password or unable to login into super user we can easily recover it in single user mode.

Normally Linux kernel had support 8 loop device compiled into it. If you have tried to configure virtualization system asking more loops to run in the server,