- What is your favorite editor?
- What is RAID? What is RAID0, RAID1, RAID5, RAID10?
- Describe the general file system hierarchy of a Linux system.
- Describe what each of the following command line utilities do:
- tee
- awk
- tr
- cut
- curl
- tail
- sed
- Command line demo:
- Search for “my konfu is the best” in all *.py files
- Replace the occurrence of “my konfu is the best” with “I’m a linux jedi master” in all *.txt files
- Find all files which have been accessed within the last 30 days
- What is the difference between virtual memory and swap ?
- What is the difference between hardlinks and symlinks?
- What is an inode and what fields are stored in an inode?
- What are zombie processes ?
- Can you have several HTTPS virtual hosts sharing the same IP?
- What is the difference between processes and threads?
- What is the difference between exec and fork?
- How nginx can handle a lot of connections? What does it use inside?
- Example of answer: Eventloop.
- What is “nohup” used for?
- What is an atomic operation?
- I’ve added my public ssh key into authorized_keys but I’m still getting a password prompt, what can be wrong?
- How do you catch a SIGHUP ? What about SIGSEGV ? What about SIGKILL ?
- What is the Linux Kernel OOM and how does it work ?
- What’s a chroot jail?
- Describe the Linux boot process with as much detail as possible, starting from when the system is powered on and ending when you get a prompt.
- What’s LD_PRELOAD and when is it used?
- You ran a binary and nothing happened. How would you debug this?
- When can a socket receive E_AGAIN ?
- What is a dynamically/statically linked file?
- A careless sysadmin executes the following command: chmod 444 /bin/chmod – what do you do to fix this?
- I’ve lost my root password, what can I do?
- You have accidentally deleted a running script, how could you restore it ?
- What load balancers have you used ?
- AWS:
- What is the difference between an AMI and an instance ?
- What’s EBS ? What’s an EBS snapshot ? What is the real cost of having an EBS snapshot ?
- What’s a VPC ?
- What’s the difference between a region and an availability zone ?
- What’s an ELB ?
- What’s S3 ? What are the features supported on S3 ?
I’m a DevOps/SRE/DevSecOps/Cloud Expert passionate about sharing knowledge and experiences. I am working at Cotocus. I blog tech insights at DevOps School, travel stories at Holiday Landmark, stock market tips at Stocks Mantra, health and fitness guidance at My Medic Plus, product reviews at I reviewed , and SEO strategies at Wizbrand.
Please find my social handles as below;
Rajesh Kumar Personal Website
Rajesh Kumar at YOUTUBE
Rajesh Kumar at INSTAGRAM
Rajesh Kumar at X
Rajesh Kumar at FACEBOOK
Rajesh Kumar at LINKEDIN
Rajesh Kumar at PINTEREST
Rajesh Kumar at QUORA
Rajesh Kumar at WIZBRAND
