System Administration Guides and Best Practices

An overview on systemd-journald service, how logging happens in RHEL 7 Linux with Journals and systemd-journald logrotate. Compare systemd-journald vs rsyslogd

Enable persistent logging in systemd-journald by changing storage type to persistent in journald.conf to store logs in /var/log/journal without reboot

We mount filesystem using /etc/fstab to make the changes persistent across reboot. Now there is another way to mount filesystem without fstab using systemd.

Steps to automount file system using systemd automount unit file without /etc/fstab to automatically mount and unmount file system in rhel/centos 7 and 8

Creating /forcefsck and /fsckoptions doesn't work on CentOS/RHEL 7/8 Linux How to perform force file system check on boot (next reboot) using systemd-fsck?

How to execute a script after a network file system is mounted? How to start a systemd service only after NFS share is mounted and available in Linux

How to mount Oracle VirtualBox shared folder using systemd unit file at system startup? How to execute a script during reboot on the shared folder from Vbox using systemd?

Step by Step instructions to create systemd service in Linux. Detailed explanation of all the field in systemd service unit file

In our last article we configured LDAP server with TLS sertificates. Now we will configure LDAP client Linux) to authenticate with our LDAP server with ldapadd

Multi-master replication in OpenLDAP is a replication technique using Syncrepl to replicate data to multiple provider ("Provider") Directory servers. Under the Multi-master OpenLDAP configuration, all the nodes are …

Perform openldap migration from one machine to another. Migrate system users to ldap user database using migrationtools rpm

We recently upgraded our Base OS and there we starting facing this issue where all SSH connection via RSA Key started to fail with error "sshd: ssh-rsa

This tutorial covers SSH Multiplexing, explaining its benefits, setup, and use cases. We'll guide you through configuration steps, security best practices, and optimization techniques to enhance your SSH operations …

How to fix starting package installation process error populating transaction, anaconda is retrying faced during RHEL/CentOS 7/8 installation in Linux

How to configure vlan with bond using kickstart in RHEL/CentOS 7. You can configure using network --vlan or using %post section of kickstart with examples.

Use kickstart %pre script examples to perform tasks before installing the system. Use --interpreter, --log, chroot and nochroot options with %pre script RHEL/CentOS 7/8

Use kickstart post install scripts to perform tasks after installation, save logs, use interpreter with and without nochroot in RHEL and CentOS 7/8 Linux with examples

Get an overview of tuned profile tuned-adm and steps to create custom tuned profile in Red Hat or CentOS 7. List tuned profiles configure own tuned profile

Step-by-Step Tutorial to create KVM Virtual Machine using Cockpit Web Console on RHEL/CentOS 8 Linux. virtual machine creation and management with Cockpit

Step by step guide to install and configure controller node in openstack, configure openstack services like keystone, mariadb, rabbitmq, environment files

How to move directory to another partition move opt to new partition. move home to another partition. move var to new partition in RHEL/CentOS 7/8 Linux.

Configure xfs quota for user, group, projects (disk). Check and Modify XFS quota grace period. Enable and Disable XFS Quota in RHEL/CentOS 7/8 with examples

In this article I will share most used Kickstart commands to automate installation in sample RHEL/CentOS 8 Kickstart example file and link to kickstart generator

Steps to create custom RHEL ISO using Cockpit Image Builder Web Console and CLI in RHEL 8 Linux. Create Live ISO, QCOW2, Amazon Machine Image, Azure Disk Img

Steps to update kernel properly in production environment with examples. Precautions to be considered before and after you update kernel in RHEL/CentOS 7 and 8

The adcli will be using System Security Services Daemon (SSSD) to connect a CentOS/RHEL 7/8 system to Microsoft Active Directory Windows Domain

Multiple commands to test ssh connection in Linux and Unix. How to test and check SSH connections with and without shell script examples. Check 22 port status.

List active SSH connections in Linux. Show SSH connection history. Show active SSH sessions in Linux using multiple commands. How to check active ssh sessions.

3 different methods to upload file to Linux server from Windows. Using SCP or PSCP CLI tool, or Using WinSCP and/or FileZilla which are GUI based tool

How to automate SSH login with password? How to pass password to scp command used in bash script ? How to perform SSH login with password instead of using private key?