linux

Solved: Failed to restart network.service: Unit network.service not found in RHEL 8

Network scripts are deprecated in Red Hat Enterprise Linux 8 and they are no longer provided by default. In Red Hat Enterprise Linux 8, to run the ifup and the ifdown scripts, NetworkManager must be running. By default …

Deepak Prasad3 min read
linux

How to install certbot [Let's Encrypt] on Rocky Linux 9

Step by Step instructions to install and generate certs using Let's Encrypt (certbot) on Rocky Linux 9. Generate and deploy certs for Nginx and Apache server.

Omer Cakmak7 min read
linux

How to Disable the Firewall in Rocky Linux

Disable the firewall in Rocky Linux by stopping, disabling and masking firewalld, confirm the state with firewall-cmd, and re-enable it when you are done.

Omer Cakmak5 min read
linux

Create Stratis File System (thin provision) with examples (CentOS/RHEL 8)

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

Deepak Prasad10 min read
linux

Solved: vncserver service failed a configured resource limit was exceeded

vncserver service failed because a configured resource limit was exceeded tigervnc on RHEL 7, remove temporary files from under /tmp and /tmp/.X11-unix/.

Deepak Prasad4 min read
linux

How to configure bridged network in virt-manager (CentOS / RHEL 7)

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

Deepak Prasad3 min read
networking

How to create or configure NIC Teaming using nmcli (CentOS / RHEL 7/8)

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.

Deepak Prasad7 min read
linux

How to protect GRUB2 from booting kernel without password in Linux

Learn to set password to protect grub2 from booting a kernel without password. in rhel 7.To set password and protect grub2 remove unrestricted in menuentry

Deepak Prasad3 min read
linux

Understanding High Availability Cluster and Architecture

Understand thearchitectecture of different kinds of cluster i.e. high performance, load balancing and high availability cluster in Red Hat Linux

Deepak Prasad4 min read
linux

Guide to troubleshoot Cluster Resource (RHEL / CentOS 7)

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

Deepak Prasad5 min read
devops

How to create cluster resource in HA Cluster (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..

Deepak Prasad8 min read
system-administration

How to set default boot kernel on Linux ( CentOS / RHEL 7 )

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 ?

Deepak Prasad3 min read
linux

How to install and configure two node cluster in Linux ( CentOS / RHEL 7 )

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

Deepak Prasad5 min read
devops

How to configure HA LVM cluster resource to share LVM in Linux

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?

Deepak Prasad7 min read
system-administration

How to delete iscsi target from initiator ( CentOS / RHEL 7 ) Linux

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

Deepak Prasad3 min read
linux

How to disable tty or enable tty console in Linux ( RHEL / CentOS 7)

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.

Deepak Prasad3 min read
storage

How to boot Linux host from LVM snapshot using BOOM (CentOS/RHEL 8)

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.

Deepak Prasad8 min read
system-administration

8 ways to prevent brute force SSH attacks in Linux (CentOS/RHEL 7)

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

Deepak Prasad10 min read
linux

How to Install Visual Studio Code (VS Code) on Rocky Linux 9

Install Visual Studio Code on Rocky Linux 9 using the Microsoft dnf repository, a manual RPM, the Snap Store, or the tar.gz archive.

Omer Cakmak4 min read
linux

Install WordPress on Rocky Linux 9 [Step-by-Step]

Step by Step instructions to install wordpress on Rocky Linux 9

Omer Cakmak4 min read
linux

Install FFmpeg in Rocky Linux 9

Step by step instructions to install ffmpeg in Rocky Linux 9

Omer Cakmak4 min read
linux

Install Memcached on Rocky Linux 9 [Step-by-Step]

Step by Step instructions to install Memcached on Rocky Linux 9. 2 different methods to install using default package manager and downloading from official source.

Omer Cakmak5 min read
linux

Install PgAdmin4 on Rocky Linux 9 [Step-by-Step]

Step by step instructions to install pgadmin4 on Rocky Linux 9 with screenshots

Omer Cakmak4 min read
storage

DRBD Tutorial | Setup Linux Disk Replication | CentOS 8

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

Deepak Prasad15 min read
system-administration

2 ways to boot with old kernel version in RHEL 8 using grubby

Steps to set default boot kernel in RHEL 8 using grubby and boot with old kernel version. Check the kernel version which will get activated after reboot

Deepak Prasad7 min read
devops

#1-ELK Stack: Configure elasticsearch cluster setup CentOS/RHEL 7/8

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

Deepak Prasad20 min read
devops

Install & configure glusterfs distributed volume RHEL/CentOS 8

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

Deepak Prasad9 min read
storage

Configure glusterfs distributed replicated volume RHEL/CentOS 8

Steps to install and configure shared storage with glusterfs distributed replicated volume in RHEL/CentOS 8 Linux. Configure Red hat Storage in Red Hat 8

Deepak Prasad9 min read
storage

Install & configure glusterfs replicated volume RHEL/CentOS 8

GlusterFS Tutorial to install and configure glusterfs replicated volume shared storage with redundancy in RHEL/CentOS 8 Linux GlusterFS Replication Volume Type

Deepak Prasad9 min read
system-administration

How to restrict or allow ssh only from certain users, groups or hosts in Linux

How to allow SSH for root login only from specific host or IP address? How to configure and restrict SSH to permit login only for certain users and/or groups?

Deepak Prasad6 min read