- 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 Rajesh Kumar, a DevOps, SRE, DevSecOps, Cloud, and Platform Engineering expert passionate about sharing practical knowledge, real-world experiences, and industry best practices. I have worked at Cotocus and regularly write about technology, travel, investing, health, product reviews, and digital marketing through my various platforms.
I publish technical articles at DevOps School, travel stories at Holiday Landmark, stock market insights at Stocks Mantra, health and fitness guidance at My Medic Plus, product reviews at TrueReviewNow, and SEO and digital marketing strategies at Wizbrand.
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