System Administration Guides and Best Practices

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?

Steps to extract, modify, update and rebuild initrd image in CentOS RHEL 7 and 8 ISO DVD with examples using XZ / LZMA format Update initrd with modules drivers

Configure secure logging to remote log server with rsyslog TLS certificates in CentOS/RHEL 7 Forward syslog to remote log server securely using TLS certificates

Step-by-Step Tutorial to transfer files over SSH using SSHFS between two Linux servers or Linux and WIndows server. Copy files between linux and windows using sshfs

Rsync and SCP recursive examples to copy directory and contents. scp from local to remote server and scp from remote to local. copy file from ssh to local or local to ssh server

Step by Step instructions to capture SSH and SSHD strace logs with DEBUG and VERBOSE. Add timestamps to SSH and SSHD debug and strace logs

Execute SSH and add timestamp to SSH verbose logs. Store the verbose logs into a log file and add timestamp prefix to each entry of log file with while loop

[Solved} Steps to debug and fix postponed publickey error leading to SSH connection failure. You may also get ROOT LOGIN REFUSED, Failed pubkey, permission issues with SSH

Step by step instructions to mount and unmount NFS share in Linux with examples. How to fix umount.nfs4:: device is busy

In this tutorial I will share the step by step instructions to run SSHD as non- root user in Linux platform. The same steps can be used for non privileged docker container pods and kubernetes

Configure thin provision lvm using kickstart and PXE server in CentOS/RHEL 7 and 8 Linux with examples. Define custom chunksize and metadata to create thinpool

Use chroot_local_user to restrict FTP user to a directory in vsftpd.conf in Linux. You can specify the directory name and path which acts as home directory for chroot

Linux NFS mount options example, Linux NFS exports options, root_squash vs no_root_squash, hard mount vs soft mount, Unix NFS performance. NFS mount options fstab

Grub files, also known as GRand Unified Bootloader, are essential components in the Linux operating system that facilitate the booting process. Grub files are

To integrate Samba share with Active Directory we can use winbind to join Linux client with domain controller and use smbclient to access the windows share

Step by step tutorial to configure postfix using third party gmail smtp relay to send mails to external network. Use SASL with Google 2-Step Authentication

Step by Step guide tutorial on how to install and configure FreeIPA, ipa server LDAP, kerberos, DNS and IPA client on RHEL/CentOS 7 Linux with GUI and CLI

Step-by-Step Guide to create KVM Virtual Machine using Virtual Manager in RHEL and CentOS 8 Linux. Create VM, Take Snapshot, Assign Networks using Virtual manager GUI