Coforge Linux Administrator Interview Questions and Answers for Experienced

To check server performance, monitor CPU, memory, disk usage. Use tools like top, htop, iostat. Check logs for errors.

• Monitor CPU usage with top or htop command

• Monitor memory usage with free or vmstat command

• Monitor disk usage with df or iostat command

• Check logs for errors related to the application

• Use performance monitoring tools like Nagios or Zabbix

To activate a Volume Group or LV, use the vgchange or lvchange command.

• Use the vgchange command to activate a Volume Group.

• Use the lvchange command to activate a Logical Volume.

• Specify the name of the Volume Group or Logical Volume as an argument.

• Use the -a y option with vgchange to activate all Volume Groups.

• Use the -a y option with lvchange to activate all Logical Volumes in a Volume Group.

To present a SAN LUN to Solaris LDOM or CDOM, we need to follow a few steps.

• First, we need to identify the SAN LUN and the target LDOM/CDOM.

• Then, we need to create a logical device using the format command.

• Next, we need to configure the LUN using the cfgadm command.

• Finally, we need to add the LUN to the LDOM/CDOM using the ldm add-vdsdev command.

Patching is the process of updating software to fix vulnerabilities and improve performance.

• Patching involves identifying and applying updates to software systems.

• It is important to regularly check for patches and updates from vendors.

• Patching can be done manually or through automated tools.

• Before applying patches, it is crucial to test them in a controlled environment.

• Patching should be performed in a planned and syst...read more

Booting process is the sequence of events that occur when a computer system is turned on.

• BIOS/UEFI firmware initializes hardware components

• Bootloader loads the kernel into memory

• Kernel initializes system processes and drivers

• Init system starts user space processes and services

• Graphical user interface (GUI) is loaded for user interaction

I have worked on Red Hat Enterprise Linux versions 6, 7, and 8.

• I have experience with installation, configuration, and maintenance of Red Hat Enterprise Linux servers.

• I have worked with Red Hat Enterprise Linux 6, 7, and 8 in both physical and virtual environments.

• I have experience with package management, user management, and security hardening on Red Hat Enterprise Linux.

• I have also worked with Red Hat Satellite for ...read more

Free up disk space by identifying and removing unnecessary files.

• Identify large files and delete them

• Remove old log files

• Clear cache and temporary files

• Compress large files

• Move files to another disk or server

Sticky bit and SGID are special permissions in Linux file system.

• Sticky bit is denoted by 't' in file permission and restricts deletion of files in a directory by non-owners.

• SGID is denoted by 's' in file permission and sets the group ID of newly created files to the group of the parent directory.

• SGID can also be used on executable files to allow users to run them with the permissions of the group that owns the file.

• SG...read more

Zombie is a terminated process that still has an entry in the process table, while orphan is a child process whose parent has terminated.

• Zombie process is waiting for its parent to read its exit status

• Orphan process is adopted by init process (PID 1)

• Zombie process can be removed by killing its parent process

• Orphan process can continue running even after its parent has terminated

RAID stands for Redundant Array of Independent Disks. It is a data storage technology that combines multiple physical disks into a single logical unit.

• There are several types of RAID, including RAID 0, RAID 1, RAID 5, RAID 6, RAID 10, and more.

• RAID 0 offers no redundancy but provides improved performance by striping data across multiple disks.

• RAID 1 provides mirroring of data across two disks, offering redundancy but n...read more

Network bonding is the process of combining multiple network interfaces into a single logical interface.

• Network bonding provides redundancy and increased bandwidth.

• There are different bonding modes such as active-backup, balance-rr, and LACP.

• Bonding can be configured using the ifenslave utility or through network configuration files.

• Examples of network interfaces that can be bonded include Ethernet, Wi-Fi, and InfiniBa...read more

systemd is a system and service manager while services are individual programs that run in the background.

• systemd is responsible for managing the system's startup and shutdown processes

• services are individual programs that run in the background and can be managed by systemd

• systemd can start, stop, restart, enable, and disable services

• services can be configured to start automatically at boot time using systemd

• systemd pr...read more