Infosys Linux Administrator Interview Questions and Answers

Q1. If a server patched with new kernel update after reboot server came up with old kernel only. How will you troubleshoot it ?
Ans. 
To troubleshoot a server that booted up with the old kernel after a new kernel update, check the bootloader configuration, verify the kernel installation, and review the update process.
• Check the bootloader configuration to ensure it is pointing to the correct kernel version.

• Verify the kernel installation to see if the new kernel was successfully installed.

• Review the update process to identify any errors or issues that ...read more
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Q2. What are the various commands to check the CPU , Memory utilization in Linux server ?
Ans. 
Various commands to check CPU and Memory utilization in Linux server.
• To check CPU utilization: top, mpstat, sar

• To check Memory utilization: free, vmstat, sar -r
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Q3. How will you create and add new disk to the system using LVM ? Write the commands of the process.
Ans. 
To add a new disk to the system using LVM, you need to initialize the disk, create a physical volume, extend the volume group, and finally extend the logical volume.
• Initialize the disk using fdisk or parted command

• Create a physical volume using pvcreate command

• Extend the volume group using vgextend command

• Extend the logical volume using lvextend command

• Resize the filesystem using resize2fs or xfs_growfs command
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Q1. Tell me about yourself
Ans. 
Experienced Linux Administrator with a passion for troubleshooting and optimizing systems.
• Over 5 years of experience managing Linux servers in a corporate environment

• Skilled in shell scripting, server configuration, and system monitoring tools like Nagios

• Strong problem-solving skills and ability to work well under pressure

• Certified in Red Hat Enterprise Linux (RHCE)

• Passionate about staying up-to-date with the latest te...read more
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Q2. Can you let us know the skills other than mentioned skills in resume?
Ans. 
Some additional skills I possess include scripting languages, troubleshooting abilities, and strong communication skills.
• Proficiency in scripting languages such as Python, Bash, or Perl can be beneficial for automating tasks and improving efficiency.

• Strong troubleshooting abilities are essential for quickly identifying and resolving issues that may arise in a Linux environment.

• Effective communication skills are importa...read more
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Basic English and puzzles

Q1. Basic commands of linux?
Ans. 
Basic commands of Linux include ls, cd, pwd, mkdir, rm, cp, mv, grep, and chmod.
• ls - list directory contents

• cd - change directory

• pwd - print working directory

• mkdir - make directory

• rm - remove files or directories

• cp - copy files or directories

• mv - move files or directories

• grep - search for patterns in files

• chmod - change file permissions
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Q2. About patching and distributions?
Ans. 
Patching in Linux involves updating software to fix vulnerabilities and improve performance across various distributions.
• Patching is crucial for security; it addresses vulnerabilities in the system.

• Different distributions have unique package managers (e.g., APT for Debian, YUM for CentOS).

• Regular updates can be automated using tools like 'cron' jobs.

• Example: Ubuntu uses 'apt-get update' and 'apt-get upgrade' for patchi...read more
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Q1. They asked me about salary expectations
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Q1. Booting process
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Q2. What is nas and strorage
Ans. 
NAS (Network Attached Storage) is a type of storage device that is connected to a network and provides data storage and access to multiple clients.
• NAS devices are dedicated file storage devices that operate over a network.

• NAS devices can be accessed by multiple users or clients simultaneously.

• NAS devices often have their own operating system and management interface.

• Examples of NAS devices include Synology DiskStation,...read more
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Q1. What is your profile.? what is your notice period what is your current location?
Ans. 
I am a skilled Linux Administrator with extensive experience in system management, troubleshooting, and network configuration.
• Over 5 years of experience in Linux system administration.

• Proficient in shell scripting and automation using tools like Ansible.

• Experience with cloud platforms such as AWS and Azure.

• Strong knowledge of networking concepts and security protocols.

• Currently managing a team of junior administrators.
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Q1. How to check memory space? what is lvm? what is crontab? how to extend lvm? what is swap memory?
Ans. 
To check memory space, use 'free' or 'top' command. LVM is Logical Volume Manager for managing disk space. Crontab is a tool for scheduling tasks. Swap memory is virtual memory used when physical memory is full.
• Check memory space using 'free' command to see total, used, and free memory

• LVM is a tool for managing disk space by creating logical volumes from physical volumes

• Crontab is a file used to schedule tasks to run a...read more
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