Automate Root Password Change using Ansible Playbook
Updating/Changing the root user’s password is a routine task being performed by every Linux administrator in any organization. Earlier people used to accomplish this task using a script.
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Cronjob Interview Questions
1) How to execute a Linux cron job every second using Crontab? Answer: You cannot schedule a every-second cronjob. In …
How to Recover Default File & Directory Permissions
Today, I come across a situation where, an application guy hit chmod command in wrong way. He hit below command where …
How to Reload New Kernel Without Complete Reboot in CentOS/RHEL
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SELinux Interview Questions
1) What are Booleans? Answer: Booleans are SELinux policy rules which changes behaviour of selinux policies. Booleans …
Using TAR Command Practically in Linux
tar is a commonly used command to create archive files. TAR stands for Tape ARchive. It is important to note that tar is …
Ansible Playbook Task to Delete All Contents of a Directory
Today, I came across a situation where I had to write a task in an ansible playbook to delete the contents of …
Ansible Playbook to Migrate RHEL Servers From Satellite5 to Satellite6
Below Playbook can be used to migrate any RHEL6 or RHEL7 server from Satellite version 5 to Satellite version 6.
Easiest Way to Exclude NFS Mount Points in Find Command
Today, I was told to remove a domain group from the active directory. However, there were files/directories owned by …
Easiest Way to Increase Linux LVM by Expanding Virtual Disk
Today, I come across a situation where I had to increase the size of lvm partition without adding a new virtual disk.
How to Append a Text/Line to Root Owned Files With Sudo Access
Today, I came across a situation where I was writing a script for automation. In the script, I had to append a line to …