Sunday, 16 January 2022

How to Resolve showmount fails with error “clnt_create: RPC: Program not registered “on CentOS 7



NFS share is a network file sharing protocol. It is used to provide shared access to files and folders across Linux machines over the network. This error comes when sometime the NFS service is stopped on the NFS server and will gives the below error while running showmount –e <NFS Server IP>.

Saturday, 15 January 2022

How to Resolve kernel panic at boot with error initrd image file not found on CentOS 7



Sometime after yum update transaction break or kernel update or fresh install, the system fails to find initrd (initial ram disk) and also due to that unable to mount the root file system and also fail to boot the system with below message on CentOS 7 systems:

How to Resolve “kernel panic at boot with error Unable to mount root fs on unknown-block” on CentOS 7



Sometime after yum update transaction break or kernel update or fresh install, the system fails to mount the root file system and also fail to boot the system with below message on CentOS 7 systems:

Wednesday, 12 January 2022

How to Configure Local YUM repository on CentOS 7 using ISO Image



YUM (YellowDog Updater Modified) is a package management tool for RPM based Linux system that helps to install, uninstall, and update packages local and other client machines over the network. YUM resolve all dependency and install the package with all dependencies.

Tuesday, 11 January 2022

How to Install SEmanage on CentOS 8



SEmanage is a command-line utility and provide ability to manage SELinux contexts. Its needs separate installation by default this package is not available in CentOS 8 minimal installations.

How to resolve -bash: showmount: command not found on CentOS 8



showmount command: It is a command-line utility and provide ability to manage NFS share. Its needs separate installation by default this package is not available in CentOS 8 minimal.

How to Resolve wrong fs type while mounting NFS share on CentOS 7



NFS share is a network file sharing protocol. It is used to provide shared access to files and folders across Linux machines over the network. This error comes when the nfs-utils package is missing from the machine and will give the below error while mounting any NFS share point.

Tuesday, 4 January 2022

How to resolve -bash netstat command not found on CentOS 8



Netstat is a command-line utility and provide ability to check open ports whether it is UDP or TCP. Its needs to separate installation by default this package is not available in CentOS 8 minimal.

How to Change the SSH Port on CentOS 8



We can change the default SSH port CentOS 8 as an added security concerns. To Change the SSH Port on CentOS 8 systems connect to server with root privileges.

How to resolve -bash: semanage: command not found on CentOS 8



Semanage command: It is a command-line utility and provide ability to manage SELinux contexts. Its needs to separate installation by default this package is not available in CentOS 8 minimal.

How to Install and Use tcpdump Command on CentOS 8



Tcpdump is a command line packet sniffer/ packet analyser tool which used to capture or filter TCP/IP packets that received or transferred over a network on a specific interface. By default, tcpdump is available under most of Linux distributions but if we have a minimal installation of CentOS 8.

Saturday, 1 January 2022

How to Disable SSH Remote Root Login on CentOS 8



After fresh system installation the Remote root login is enabled by default on the CentOS 8. As recommended, SSH Remote root login must be disabled for security and compliance on production systems.

How to Enable SSH root login on CentOS Stream 9 System



After fresh system installation the root login on the CentOS Stream 9 is disabled by default. When attempt to login as root user to CentOS Stream 9 the access will be denied (access denied).

How to Install CentOS Stream 9 Minimal Step by Step



The CentOS Project is recently released CentOS Stream 9. It is a new community version of RHEL and added many new features for users.