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July 6, 2016

How to increase SWAP Memory in Centos 7

To increase SWAP Memory in Centos 7

Swap space is used when the physical memory (RAM) is full.Swap memory increases the efficiency of Ram. This tutorial explains how to increase SWAP memory in Linux after installation.

There are two methods to increase the swap memory after installation.

1.fdisk utility

To check the system for swap information, use swapon -s option.

[root@linuxhelp ~]# swapon -s Filename Type Size Used Priority /dev/sda2 partition 2047996 25348 -1

To view the system’s overall memory usage, execute the following command.

[root@linuxhelp ~]# free -m total used free [...]
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June 28, 2016

How to mount/unmount Local and Network Filesystems in Linux

Mount/Unmount Local and Network Filesystems in Linux

A mount point is a directory that is used to access the filesystem on the partition. This will be attained on a one-time basis by using tools like mount or persistently across reboots to edit the file /etc/fstab. In this article we will discuss the steps to Mount/Unmount Local and Network File system in linux. Run the following command to shows the currently mounted file systems.

[root@linuxhelp ~]# mount proc on /proc type proc (rw,nosuid,nodev,noexec,relatime) sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime,seclabel) devtmpfs on /dev type devtmpfs [...]
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June 16, 2016

How To Generate Btrfs File System in Linux

Btrfs File System- Creation and Management in Linux

This article guide us to create and manage the Btrfs File System in linux with video tutuorial. Btrfs file system is a GPL-licensed copy-on-write (COW) developed by multiple companies. In this files can be created in any characters except “/” and NULL, which has self-healing features and have the capability of spanning multiple volumes.


Added convert option to show progress. Ability to link lost files to lost+found. This is a fix for a recent kernel Bug. By default mkfs skinny-metadata feature is available from kernel 3.10. To repair the severely corrupted file-systems with care. Sub volumes for [...]
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June 11, 2016

How to Create and Convert Linux File Systems

Steps to Create and Convert Linux File Systems

The file system refers to a structure or a rule for operating systems to store the files in disk or partition. File systems has some types like extended file systems ext2, ext3 and ext4.

Second Extended File System – ext2

It is developed by Remy Card, which is introduced in 1993. In several Linux distro like RedHat and Debian, it was considered as the first default file system. It is used to overcome the legacy “ext” file system limitation with Flash based storage media like USB Flash drive, SD Card. 16GB – 2TB is its maximum size but journaling feature is not available.

Third Extended File System – [...]
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June 7, 2016

Parted commands in Linux with examples

Linux ‘Parted’ Commands to Create, Delete and Rescue Disk Partitions

Parted is a command line tool that helps to manage the hard disk partitions. The Linux ‘Parted’ Commands that are used to Create, delete and Rescue Disk Partitions is explained in this article.

To Install Parted on Linux

Parted is a pre-installed tool and if it is not available install it by using the following commands.

On Fedora 22+ versions

# dnf install parted

On Debian/Ubuntu systems

$ sudo apt-get install parted

On RHEL/CentOS and Fedora

[root@linuxhelp ~]# yum install parted -y Loaded plugins: fastestmirror, langpacks Loading mirror speeds from cached hostfile * base: [...]
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June 4, 2016

How to configure LDAP Server in RHEL/CentOS

To configure LDAP in RHEL7/CentOS

LDAP stands for Lightweight Directory Access Protocol, it is a directory service protocol for centralized authentication for the clients over a network. LDAP allow users to access centrally stored information like directories and files on the server. LDAP holds user accounts and information about all the users so they don’t need to have an account locally.

Setup Environment

LDAP Server:   IP- LDAP Client:   IP-

Requirements Make sure the client and server can be able to communicate each other by IP address or hostname. You Must have Domain Name [...]
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June 1, 2016

How to Setup Standard Linux FS & Configure NFSv4 Server

To Set up Standard Linux File Systems and Configure NFSv4 Server

In this article we are going to discuss how to set up Standard Linux File Systems and configure NFSv4 Server. NFS Server will provides a service to share files over a network to Linux Clients.

Before going to configure NFS server, just make sure the NFS server is up and running.

Do the following process once the NFS server is set,

→ To configure NFS server to share a local directory over a network. → Automatically Mount those network shares in clients, either via the /etc/fstab file or autofs.

Server and Client Configuration

Before going to configure NFS server note the IP for Server and [...]

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June 1, 2016

How to create and setup LUNs using LVM

To create and setup LUNs using LVM on RHEL/CentOS/Fedora

LUN is a Logical Unit Number that shared from the iSCSI Storage Server. The iSCSI target server physical drive shares its drive to initiate over TCP/IP network. It form a large storage as SAN (Storage Area Network) with a collection of drives. LUNs are defined in LVM as per space availability in real environment. Creating LUNs using LVM is explained in this article.

Importance of LUN

It is used for storage purpose. It is used to install Operating systems and also in Clusters, Virtual servers, SAN etc. To Create LUNs using LVM in iSCSI Target Server

Using ‘fdisk -l’ command, find out the list of [...]

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May 31, 2016

How to Configure NFS(Network File System) in Linux

To Setup NFS (Network File System)

Network File System is the most commonly used network services. It is based on the Remote procedure call. It allows the client to mount automatically on remote file systems. It provides transparent access to it as if the file system is local. Setup NFS (Network File System) on RHEL/CentOS/Fedora and Debian/Ubuntu is explained in this article.

Uses of NFS To share out data on a central server Can be secured with Kerberos and Firewalls. Newer version of NFS supports pseudo, acl root mounts. No manual refresh needed for new files. USB storage devices can be used by other machines on the network. Users get their data irrespective of physical [...]
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May 30, 2016

Self-Heal and Re-Balance Operations in Gluster File System

Steps to Perform Self-Heal and Re-Balance Operations in Gluster File System

Gluster File System has a self-heal daemon, which is an inbuilt feature to take care of some failure situations. Performance of Self-Heal and Re-Balance Operations in Gluster File System is explained in this article.

To Performing Self-heal in Gluster File System

First issue the following command to create a replicated volume.

[root@server ~]# gluster volume create volume1 replica 2 force Volume create: volume1: success: please start the volume to access data

Next start the volume1.

[root@server ~]# gluster volume start [...]