Command to create and delete group in Red Hat and CentOS linux
To create new group ,use given below command
# groupadd groupname
Show User Account Password Expiration
To get details of user account show account aging, password expiration ,we use the command chage.
With chage command use the option -l or –list.
Squid Service Start/Restart in CentOS
Log into SSH on your dedicated or cloud server.
Start the Squid service
#/etc/init.d/squid start
Find Installation Date and Time of RPM Package
RPM stands for Red Hat Packet Manager. It is a package management system in all Red Hat based Operating System (RHEL/CentOS/Scientific Linux). In RPM known file format .rpm is used. rpm.org community is involve in maintenance and development of RPM.
How to Use chown in Linux
Use the chown command to change file owner and group information. Use the chmod command to change file access permissions such as read, write, and access.
How to Force fsck on Reboot
The system utility fsck (for “file system check”) is a tool for checking the consistency of a file system in Unix and Unix-like operating systems.
Disable Recursion on Bind DNS Server
Log into SSH on your dedicated or cloud server.
# vi named.conf
Make sure following settings exists under Options { … } settings:
Finding Log Files on CentOS
All major system log files are located in the /var/log directory in Centos Linux. Below is a list of the standard log files that are located on a clean Centos install along with a short description.
How to Limit the IP Address that sshd Listens
Log into SSH on your dedicated or cloud server.
You can edit the sshd_config file located in /etc/ssh/.
# vi /etc/ssh/sshd_config
How to Re-install Bootstrap Code (GRUB)
If you have repaired your system from a backup, or have installed another OS that may have overwritten the master boot record (MBR), you will need to repair the bootstrap area.
Re-install bootstrap code (GRUB)
