CentOS tutorials

As you know, CentOS Linux 8 became the end of life on 31 Dec 2021. It will now continue its life as CentOS Stream 8. Many people/organizations using CentOS

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

You can now use dnf command to remove old kernels from RHEL/CentOS 8 Linux. package-cleanup doesn't work any more. Use oldinstallonly with installonly_limit

Step by step Guide to install Oracle Virtual Box on RHEL / CentOS 7 Linux. To install Oracle Virtual Box you need EPEL repo. Oracle Virtual 5.2 is out now

Configure network bridge using nmcli for static and dhcp ip. nmcli connection reload. nmcli onboot. nmcli network manager centos 7. nmcli con add modify

Steps to enable SSH access in linux rescue mode and configure network in rescue mode in RHEL/CentOS 7/8 with example transfer sosreport file inst.sshd=1

Configure Network Bound Disk Encryption (NBDE) based LUKS Disk Encryption using Clevis and tang Server in CentOS/RHEL 7/8 Linux Boot without password clevis key

Stratis Architecture, Steps to create stratis file system with thin provision, create stratis pool, mounting stratis file system on rhel 8 linux with examples

Steps to configure bridged network in virt-manager. Virtual Machine Manager provides a graphical tool for administering virtual machines for KVM, Xen etc

Learn to configure NIC teaming on CentOS/RHEL 7 Linux node. RHEL 7 implements network teaming with a small kernel driver and a user-space daemon, teamd.

To download entire repository from CentOS / RHEL 7 you will need one time access to Internet. Next you can sync the online repository to your local system

Download rpm package and all dependencies in CentOS / RHEL 7 using yumdownloader or repotrack. You can also use repoquery with yumdownloader to download rpm

How to exit full screen mode in qemu virt-manager for kvm hosts or get out of fullscreen. This article is validated on RHEL / CentOS 7 Linux on vnc viewer.

Configure high availability cluster, create cluster resource and troubleshoot cluster resource for a cluster on Red Hat / CentOS 7 with examples.

Configure High Availability Cluster and configure cluster resource and add behind the cluster in CentOS and Red Hat 7 Linux using pcs resource create..

Increase decrease, change tmpfs partition size in Red Hat Linux 7, /run /run/user/$PID /dev/shm /sys/fc/cgroup using fstab RuntimeDirectorySize logind.conf

How to set default boot kernel in linux? Change the default boot entry for kernel ? Boot with old kernel version ? Revert to previous kernel version ?

How to install configure two node cluster in linux on centos rhel 7 using vmware virtualbox corosync-quorumtool two_node wait_for_all auto_tie_breaker

How to configure HA LVM on CentOS / RHEL 7 Linux without GFS2. How can I configure cluster service or resource to activate and monitor shared LVM volumes?

How to delete iscsi target? Remove inactive iscsi target? Remove iscsi storage target from initiator? Remove iscsi virtual disk on CentOS / RHEL 7 Linux.

How to enable tty for more than 6 console. How to disable all the tty terminals in Linux. systemd disable tty. systemd enable tty using getty service in Linux.

Step by Step guide to boot CentOS/RHEL 8 or 7.5 and higher Linux with LVM snapshot using BOOM. with examples. Merge LVM snapshot and delete boom profile later.

Steps to configure master slave dns server using bind chroot environment in RHEL/CentOS 7 Linux. Sample master dns server and slave dns server with examples.

Steps to secure master slave dns server using various algorithm types to secure the data replication between master and slave dns server using dnssec key Linux

Prevent brute force SSH attacks in RHEL CentOS 7 with examples using Fail2ban, account lockout, SSH rate limit using iptables, sshd_config, SHA512 hashing

Overview on different openssh authentication methods using sshd_config in RHEL/CentOS 7/8 Linux with Examples. Authenticate your sshd connection in Linux

Step-by-Step DRBD Tutorial to install and configure DRBD Storage device on CentOS 8. Perform Linux disk replication runtime. How to perform DRBD configuration

Configure SSH Host Based Authentication using sshd_config, shosts,equiv per user RHEL/CentOS 7/8. Compare Host based authentication vs public key authentication

Elasticsearch Tutorial on ELk Stack to configure elasticsearch cluster in RHEL/CentOS 7/8 Linux with examples. Get cluster helath status, node types, stats

Steps to install and configure glusterfs distributed volume on two cluster nodes with RHEL/CentOS 8. GlusterFS Tutorial with shared storage Red Hat/CentOS 8