Senior Linux Administrator Interview Questions and Answers

Some tools used by Senior Linux Administrators include Ansible, Nagios, and Docker.

• Ansible - used for automation of tasks and configuration management

• Nagios - used for monitoring and alerting of system and network resources

• Docker - used for containerization of applications for easy deployment and management

You can detect a new added disk to the existing disk in VMware vm by rescanning the SCSI bus.

• Use the command 'echo '- - -' > /sys/class/scsi_host/hostX/scan' to rescan the SCSI bus.

• Check the output of 'lsblk' command to see the newly added disk.

• You can also use the 'fdisk -l' command to list all disks including the newly added one.

To change all users password expiry age at once, use the chage command with the -M option.

• Use the chage command with the -M option to set the maximum number of days between password changes for all users.

• For example, to set the password expiry age to 90 days for all users, use: chage -M 90 -m 0 -I -1 -E -1

• Make sure to replace with the actual username of the user you want to change the password expiry age for.

Create a swap partition and make it usable after booting

• Create a partition using fdisk or parted command

• Format the partition using mkswap command

• Add the partition to /etc/fstab file

• Activate the swap partition using swapon command

The Linux booting process involves several stages, including BIOS, bootloader, kernel, initrd, and init system.

• BIOS performs hardware checks and loads bootloader from the boot device

• Bootloader loads kernel and initrd into memory

• Kernel initializes hardware and mounts the root filesystem

• Initrd loads necessary modules and drivers for the kernel

• Init system starts user space processes and services