Cognizant Linux Administrator Interview Questions, Process, and Tips

Q1. How to check Kernel and OS Version, How to change file permissions, Whar are the default permissions of few files, In which file user id and password stored, Network configuration stored in which file, How...read more
Ans. 
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 s...read more
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Q2. What is LVM, Explain LVM Architecture, What is Raid, What is the booting process of RHEL, How to manage failed unmount or mount, What are the issues you have faced in working with Linux Servers, What is sp...read more
Ans. 
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 ...read more
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Q1. Baasics of Linux
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Linux is an open-source operating system based on Unix, known for its stability, security, and flexibility.
• Linux is open-source, meaning its source code is freely available for anyone to use, modify, and distribute.

• Linux is based on Unix, which is a powerful and stable operating system used in servers and mainframes.

• Linux is known for its security features, such as user permissions and access control.

• Linux is highly cu...read more
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Q2. Shel script and commands
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Q1. What is lun and how to extend and reduce them
Ans. 
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.
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Q2. Where do we store syslog file in linux and what are the different type of filesystems in linux
Ans. 
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 snapsh
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Q1. What is linux , crontab
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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 frequ...read more
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Q2. Booting loading lvm
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Booting with LVM involves loading the LVM module and activating the logical volumes.
• Install LVM package during OS installation

• Create physical volumes and volume groups

• Create logical volumes and file systems

• Modify /etc/fstab to mount logical volumes at boot

• Update initramfs to include LVM module

• Activate logical volumes during boot process
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