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- Describe swap partition
- How do you make ssh daemon more secure?
- What's an inode?
- Why can't you make a hard link between partition?
- Why would anyone use LVM?
- Describe ACL, what commands will you use to set and check ACL on a file?
- An (CLI) application segfaults. How do you start troubleshooting it?
- How do you check if an application leaks memory?
- Assuming bash and uid=0, how would you prevent rm -rf $A/bin to misbehave if you forgot to set A=/path/to/somewhere?
- What kind of signals can we send via the kill command?
- Enumerate some widely used port numbers and the associated services
- What happens in the background when you do "wget https://index.hu/"? What network requests, protocols are used?
- What's the difference between forked and threaded process?
- You have accidentally removed executable right from all files in /bin. How could you list file?
- Describe the purpose of fsck utility. How could you use it?
- Describe the setuid and setgid flags on an executable file. Enumerate a few setuid or setgid binaries in Linux. What 'find' command (with parameters please) would find these files in /bin?
- What's the loopback device, what would you use it for?
- How would you mitigate the risk of stealing passwords on a Linux server?
- What are the network and broadcast addresses of 10.1.2.3/25?
- How do you install 'an average' open source application that is not found in your repo from a git repo?
- Explain git rebase
- Describe some best practices for writing a Dockerfile
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