Cognizant Linux Administrator Interview Questions and Answers

LVM is Logical Volume Manager used for managing disk space, RAID is Redundant Array of Independent Disks for data protection, RHEL boot process involves BIOS, GRUB, kernel loading, and init process.

• LVM allows for dynamic resizing of logical volumes without downtime.

• RAID combines multiple disks for data redundancy or performance improvement.

• RHEL boot process involves BIOS POST, GRUB bootloader, kernel loading, and init process.

• Managing failed unmount or mount involves checking...read more

To check Kernel and OS Version, change file permissions, view default permissions of files, locate user id and password file, find network configuration file, and filter keywords.

• To check Kernel and OS Version: Use 'uname -a' command

• To change file permissions: Use 'chmod' command followed by permission code and file name

• Default permissions of few files: For example, /etc/passwd has 644 permissions

• User id and password stored in: /etc/passwd file

• Network configuration stored in:...read more

Syslog files are stored in /var/log directory. Different types of filesystems in Linux include ext4, xfs, btrfs, and more.

• /var/log directory is the default location for storing syslog files

• Different types of filesystems in Linux include ext4, xfs, btrfs, etc.

• ext4 is the default filesystem for most Linux distributions

• xfs is commonly used for large-scale storage systems

• btrfs is known for its advanced features like snapshots and checksums

LUN stands for Logical Unit Number, used to represent a logical volume on a storage area network (SAN).

• LUNs are virtual disks created on a SAN storage system.

• To extend a LUN, you can use tools like LVM (Logical Volume Manager) to add more physical storage to the existing LUN.

• To reduce a LUN, you can shrink the filesystem on the LUN and then shrink the LUN itself using storage management tools.

Linux is an open-source operating system based on Unix. Crontab is a tool used to schedule tasks in Linux.

• Linux is highly customizable and widely used in servers and supercomputers.

• Crontab allows users to schedule tasks to run automatically at specified times.

• Examples of tasks that can be scheduled with crontab include backups, updates, and system maintenance.

• Crontab uses a specific syntax to specify the time and frequency of tasks.

• Crontab can be edited using the command line...read more

A Linux administrator is responsible for managing and maintaining Linux-based systems.

• Installs, configures, and updates Linux operating systems and software

• Monitors system performance and troubleshoots issues

• Manages user accounts and permissions

• Implements security measures to protect systems and data

• Automates tasks using scripting languages like Bash or Python