Gernel question
What is the experienc on linux(relavent).
Primary Skill/Seconday skill.
about their environment(Physical/Virtual/Cloud).
Do you have external storage in you environmet.
any idea on Scripting/Ansible/Puppet.
Boot process
POST
BIOS
Grub
Kernel(linux) , initramfs
boot issues
- Fstatb mismatch
- initramfs issues
- Grub files currupt
- dracut
Hardening
What are the hardednig steps we can perform.
BIOS/Grub/root password (How to set and break).
What are ACL and how to setup them.
What are iptables and how to use them.
what is SUID/GUID/StickyBit and their usage.
Banners
ssh hardening.
- root login with password No
- how to setup passwordless authentication(Keypair)
Patching
what is the steps you will follow while patching.
what are the import pre-checks needed.
what kind of issues you will face while patching and how you will resolve.
How do you troubleshooting steps you will follow if the server is not coming up after patchig.
- Single user mode
- chroot
what is the change-backout plan for patching.
how to register server with redhat satellite.
Performance
How do you identify and troubleshoot Memory/CPU/IO issues
File Systems
How LVM works.
Difference between LVM and Non LVM FS
what are different FS available in Linux and the advantages.
NFS
Storage
what is multipath abd How to configure multipath.
DIfferenccebetween FC and ISCSi.
How to configure ISCSi storage.
How to configure FC storage.
how to check wwn numbers.
How to configure iscsi initiator.
How to check whether FC port is up or not.
what is Zoning.
How to configure oracleasm.
How to troubleshoot storage disk issues.
Networking
How to configure and check IP.
how to setup bonding and types of bonding.
what is VLAN and how to setup VLAN.
How to bring up and donw the interfaces(Normal vs VLAN).
what is trunk port.
Physcial servers
---------------
HP/Dell
How many ways we can connect Physical servers.
How to troubleshoot server crash issues.
What is RAID and types of RAID.
have you configured any RAID.
How do you approach when disk failure occurs.
How to troubleshoot when we are not able to ssh.
do you have any idea of upgrading firware on Physical servers.
How to reset ilo password.
what can we monitor using ilo.
Clusters
Do you have any clusters in your environment.
HP Service Guard / PaceMaker.
Process
Ticketing tool.
what is Change process you will follow.
How you will deal with majour incidents.
any experience on providing RCA.
Interview Good Links
https://www.thegeekdiary.com/centos-rhel-7-booting-process/
https://access.redhat.com/articles/1189123
https://access.redhat.com/sites/default/files/attachments/rh_yum_cheatsheet_1214_jcs_print-1.pdf
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