- What is a tunnel and how you can bypass a http proxy?
- What is the difference between IDS and IPS?
- What shortcuts do you use on a regular basis?
- What is the Linux Standard Base?
- What is an atomic operation?
- Your freshly configured http server is not running after a restart, what can you do?
- What kind of keys are in ~/.ssh/authorized_keys and what it is this file used for?
- I’ve added my public ssh key into authorized_keys but I’m still getting a password prompt, what can be wrong?
- Did you ever create RPM’s, DEB’s or solaris pkg’s?
- What does
:(){ :|:& };:do on your system? - How do you catch a Linux signal on a script?
- Can you catch a SIGKILL?
- What’s happening when the Linux kernel is starting the OOM killer and how does it choose which process to kill first?
- 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 a chroot jail?
- When trying to umount a directory it says it’s busy, how to find out which PID holds the directory?
- What’s LD_PRELOAD and when it’s used?
- You ran a binary and nothing happened. How would you debug this?
- What are cgroups? Can you specify a scenario where you could use them?
- How can you remove/delete a file with file-name consisting of only non-printable/non-type-able characters?
- How can you increase or decrease the priority of a process in Linux?
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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