Linux Tutorials and Command Line Guides

Being able to list packages in a YUM group can be helpful for a variety of reasons, such as ensuring that all necessary packages are installed for a specific

Developed by Sun Microsystems in 1984, NFS (Network File SystemS) is an RPC- based distributed file system structure that allows computers on the network to

In Linux operating systems, everything is a file. There are daily routine tasks within the system such as turning new features on or off or editing files. An

There are two possible reasons for wget command not found error. Either the wget package is not installed on your server or PATH variable is wrongly set.

iptables is a GPL licensed utility that allows the Linux kernel firewall to configure IP packet filter rules. Filters are organized in different tables that

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

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

Define ephemeral storage. Difference between root disk vs ephemeral disk in openstack? Ephemeral storage is non persistent storage unlike cinder swift storage.

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

Get detailed description of Step by Step Guide of Linux boot process with flowchart diagram. This also is the most asked question in interviews 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

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.

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

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

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

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

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

There are 5 different ways to find files in ubuntu.

The word torrent is an expression used to name the metadata linked to the files and folders to be downloaded. A torrent file (.torrent) does not contain the

Taking screenshots is a feature that the end user needs in every operating system. They probably started offering the take a screenshot feature after the OS