How to list all services on RHEL 6 and RHEL 7 ?
Today in this article we will look how to list all services on Red Hat Enterprise Linux 6 and 7. The command is very useful to check and search for...
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How to update RHEL, or centos major release version: from RHEL 5 to RHEL 6, or from RHEL6 to RHEL 7 ?
Today in this post, we will look how to perform redhat or centos major release upgrade. I. RHEL 5 to RHEL 6 a. In-place upgrades between major RHEL versions...
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What are different types of positional parameters available in linux ?
Positional parameters as its name suggests are different positional variables automatically defined by linux shell. The shell automatically assigns the passed parameters according to their position in 9 different parameters(1...
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RHEL 7 or CentOS 7: How to work with XFS filesystem: Backup/Restore/Create/Extend Operations ?
XFS stand for Extents File System. XFS was first created by Silicon Graphics INC in 1993. In 2001, its support in included in Linux kernel. Till RHEL 6, we have...
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Solved: xfs_quota: cannot set limits: Function not implemented.
Today we will look solution of an error message below. Solution Usually we use remount option with quota command to enable quota which doesn’t work and generates the error...
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RHEL 7 or CentOS 7: How to view file extent information for XFS filesystem ?
In ext2, ext3, or ext4 filesystems, we used the command filefrag. However for xfs filesystem, the filefrag command shows the offset values and the exact file extent values are not...
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Why journalctl logs disappear after reboot and how to make it permanent ?
By default, Journald logs gets stored in /run/log/journal directory and disappear once the system gets rebooted. I. Default Journald configuration [root@localhost ~]# date Wed Mar 13 10:50:29 PDT 2019 [root@localhost...
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What are control groups in RHEL or CentOS 7 and how to view different cgroups ?
I. Introduction to C Groups Control Groups or CGroups were introduced in the Linux kernel by Google starting from 2006 onwards. Control group as its name implies can set a...
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Explanation of Firewalld in Linux RHEL 7, or Centos 7 and how to work with it.
Similar to IPTables, firewalld is a user space utility program to manage Linux system firewall. Firewalld and IPtables both use the same kernel module i.e. NetFilter. As a result, only...
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Difference between RHEL 5, RHEL 6, and RHEL 7.
Today we will look at the between RHEL5, 6 and 7 version or you can say CentOS 5, 6 and 7 versions. I have gone through multiple sites, however not...