Infosys Linux System Administrator Interview Questions and Answers

LVM (Logical Volume Manager) is a disk management tool used in Linux systems to manage storage devices and create logical volumes.

• LVM allows for easy management of storage by abstracting physical storage devices into logical volumes.

• It provides features like volume resizing, snapshots, and striping for improved performance and flexibility.

• LVM enables dynamic allocation of storage space, making it easier to add or remov...read more

LVM (Logical Volume Manager) is configured by creating physical volumes, volume groups, and logical volumes.

• Create physical volumes using the 'pvcreate' command

• Create volume groups using the 'vgcreate' command

• Create logical volumes using the 'lvcreate' command

• Format the logical volumes with a file system using the 'mkfs' command

• Mount the logical volumes to desired mount points using the 'mount' command

• Update the '/etc/...read more

Decommission is the process of retiring a system or service, while recommission is the process of bringing it back into service.

• Decommission involves shutting down and removing a system or service from operation.

• Recommission involves restoring a decommissioned system or service back into operation.

• Decommission and recommission are common processes in IT infrastructure management.

• Examples include retiring an old server ...read more

A user can be created in a single line command using the 'useradd' command in Linux.

• Use the 'useradd' command followed by the username to create a user.

• Specify additional options like home directory, shell, etc. if required.

• Example: useradd john -m -s /bin/bash

Possible causes of user not able to login to an application

• Incorrect username or password

• Account locked or disabled

• Expired password

• Network connectivity issues

• Application server down

• Incorrect permissions or access rights

• Firewall blocking access

• Authentication server issues

• Application configuration errors

To set the password for a newly created user in Linux, use the 'passwd' command followed by the username.

• Open the terminal or SSH into the Linux system

• Run the 'passwd' command followed by the username of the new user

• Enter and confirm the new password when prompted

An I node number is a unique identifier assigned to each file in a Unix-like file system.

• I node number is also known as index node number.

• It contains metadata about the file such as ownership, permissions, timestamps, etc.

• It is used by the operating system to locate and access the file on the disk.

• The command 'ls -i' can be used to display the I node number of a file.