Deepak Prasad

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.

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

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..

Understand resource group and constraints with examples in Cluster. Different types of constraint, adding existing resource to group, High Available Cluster

OpenStack command line cheat sheet for begineer. This CLI cheat sheet consists of Flavor, Identity, Compute Nova, Neutron Network, Block Storage, Guestfish

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

Commands to check if server is physical or virtual in Linux Unix. dmesg, lshw, hwinfo, dmidecode commands to check if server is physical or virtual remotely

Tutorial guide to install systemtap (stap) to extract, filter and summarize data to enable diagnosis of complex performance. Systemtap Tutorial Linux

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.

nova compute architecture , what is the role of nova-api, nova-scheduler, nova- console, nova-conductor, nova-console-auth, nova-compute service in OpenStack

Restrict and prevent access to root user for files and directories in linux using extended attributes chattr. Root and all users will be restricted to modify

How to backup or copy and restore partition table in linux. linux clone partition table, linux repair partition table

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.

Steps to configure software raid 5 array in Linux using mdadm. RAID 5 is similar to RAID-4, except the parity info is spread across all drives in the array.

Sample shell script to create an interactive calculator using bc command to perform add, subsctract, multiply. divide, sine, cosine etc mathematical function.

Calculate loan EMI amount, interest and principle using bash or shell script in Linux with example. The script can be created online and runtime value.

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.

Register RHEL 7 system to Red Hat Satellite Network using subscription manager. Attach pool, enable and disable repositories with or without proxy in RHSM.conf

Unregister RHEL 7 from Red Hat Network using subscription manager and remove system profile. subscription-manager unregister, clean to remove subscription data

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

different disk types, different disk interface types. HDD vs SSD vs Optical Disks. Learn all about SCSI, IDE, ATA, SATA, Fibre Channel disk interface types

As of April 2022, statistics show that about 63.1% of the world's population have access to the internet and are frequent users. This number is expected to

Although DevOps has been serving a phenomenal role in development processes for many years, it's been lacking one small aspect - security. Therefore DevSecOps

Step by step instructions to perform golang benchmarking and testing

Use len() function to check length of a set in Python