Infosys System Administrator Interview Questions and Answers

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

This process extends a logical volume and resizes the filesystem to utilize the new space.

• #vgdisplay shows the volume group details, including free space available.

• #lvextend -L +300M ktvg /dev/ktvg/ktlv2 increases the size of the logical volume by 300MB.

• #lvdisplay confirms the new size of the logical volume after extension.

• #resize2fs /dev/ktvg/ktlv2 resizes the filesystem to occupy the new space in the logical volume.

• #...read more