National Informatics Centre Linux Administrator Interview Questions and Answers

NFS (Network File System) is a distributed file system protocol that allows a user on a client computer to access files over a network.

• NFS enables sharing of files and directories between multiple computers in a network.

• It provides transparent access to remote files as if they were local.

• NFS uses a client-server architecture where the server exports directories that can be mounted on client machines.

• It supports both re...read more

To create LVM, first create physical volumes, then create a volume group, and finally create logical volumes.

• Use pvcreate command to create physical volumes

• Use vgcreate command to create volume group

• Use lvcreate command to create logical volumes

• Use lvextend command to extend logical volumes

• Use lvreduce command to reduce logical volumes

The 'user lock' and 'user unlock' commands are used to lock and unlock user accounts in Linux.

• To lock a user account, use the 'usermod' command with the '-L' option followed by the username.

• Example: usermod -L username

• To unlock a user account, use the 'usermod' command with the '-U' option followed by the username.

• Example: usermod -U username

LUN stands for Logical Unit Number. It is a unique identifier for a logical unit on a storage area network (SAN).

• LUN is used to identify a specific disk or partition on a SAN.

• It is used in conjunction with SCSI protocol to access storage devices.

• LUNs can be created and managed using tools like LVM or multipath.

• LUNs can be shared between multiple servers for high availability and load balancing.

• Example: /dev/sdb is a LU