CGI Group Linux Administrator Interview Questions and Answers

Q1. How to check the integrity of a file system or consistency of the file sys tem
Ans. 
File system integrity can be checked using fsck command in Linux.
• Use fsck command to check and repair file system errors

• Run fsck on unmounted file systems for accurate results

• Use options like -y to automatically repair errors without user intervention
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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. How to scan if new hard is attached to a system
Ans. 
Use 'lsblk' command to scan for new hard drives attached to the system.
• Open terminal and type 'lsblk' command

• Check for any new devices listed in the output

• Alternatively, use 'fdisk -l' command to list all disks and partitions
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Q1. How to role back updates
Ans. 
To roll back updates, identify the update and use the appropriate command to remove it.
• Identify the update that needs to be rolled back

• Use the appropriate command to remove the update

• Verify that the rollback was successful
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Q1. Basic L1 question
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Q2. Basic linux command
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Q1. Project realted question and some L2 level question
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Q1. Project related question
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Q1. Salary disscussion
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Four sections were there in aptitude test

Q1. Write a code to print table of any number
Ans. 
Code to print table of any number in Python
• Use a loop to iterate from 1 to 10 (for a 10x table)

• Multiply the number by the current iteration value

• Print the result for each iteration
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Q2. What do you know about cloud computing
Ans. 
Cloud computing is the delivery of computing services over the internet, including servers, storage, databases, networking, software, and more.
• Cloud computing allows users to access and use resources on-demand without the need for physical infrastructure.

• It offers scalability, flexibility, cost-effectiveness, and increased efficiency.

• Examples of cloud computing services include Amazon Web Services (AWS), Microsoft Azur
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