Tech Mahindra System Administrator Interview Questions and Answers for Experienced

To create a Repository file/YUM client Configuration, follow these steps:

• Create a new repository file in the /etc/yum.repos.d/ directory

• Specify the repository name, base URL, enabled status, and other options in the file

• Save the file and exit the editor

• Run 'yum clean all' command to clear the cache

• Run 'yum repolist' command to verify the repository configuration

Restarting a service stops and then starts it again, while reloading a service refreshes its configuration without stopping it.

• Restarting a service completely stops it and then starts it again

• Reloading a service refreshes its configuration without stopping it

• Restarting a service is useful when there are critical changes or issues

• Reloading a service is useful when only the configuration needs to be updated

To recover root password, boot into single-user mode and reset the password.

• Reboot the system and press 'e' at the GRUB menu to edit the boot options.

• Add 'single' or 'init=/bin/bash' to the end of the 'linux' line and press F10 to boot.

• Run 'passwd' command to reset the root password.

• Reboot the system and login with the new password.

To check available physical volumes, volume groups, and logical volumes, you can use the 'pvdisplay', 'vgdisplay', and 'lvdisplay' commands.

• Use 'pvdisplay' command to display information about physical volumes.

• Use 'vgdisplay' command to display information about volume groups.

• Use 'lvdisplay' command to display information about logical volumes.

• These commands provide detailed information about the available physical vol...read more

To extend LVM, follow these steps: 1. Create a new partition. 2. Initialize the partition as a physical volume. 3. Add the physical volume to the volume group. 4. Extend the logical volume. 5. Resize the file system.

• Create a new partition using tools like fdisk or parted.

• Initialize the partition as a physical volume using the pvcreate command.

• Add the physical volume to the volume group using the vgextend command.

• Extend...read more

To check server performance, monitor CPU, memory, disk usage. Use tools like top, htop, iostat. Check logs for errors.

• Monitor CPU usage with top or htop command

• Monitor memory usage with free or vmstat command

• Monitor disk usage with df or iostat command

• Check logs for errors related to the application

• Use performance monitoring tools like Nagios or Zabbix

To activate a Volume Group or LV, use the vgchange or lvchange command.

• Use the vgchange command to activate a Volume Group.

• Use the lvchange command to activate a Logical Volume.

• Specify the name of the Volume Group or Logical Volume as an argument.

• Use the -a y option with vgchange to activate all Volume Groups.

• Use the -a y option with lvchange to activate all Logical Volumes in a Volume Group.

To present a SAN LUN to Solaris LDOM or CDOM, we need to follow a few steps.

• First, we need to identify the SAN LUN and the target LDOM/CDOM.

• Then, we need to create a logical device using the format command.

• Next, we need to configure the LUN using the cfgadm command.

• Finally, we need to add the LUN to the LDOM/CDOM using the ldm add-vdsdev command.