2.6 KiB
Level 1 Questions
- How would you prove the code is correct?
To prove the code is correct I suppose I could set up a test environment
where I could account for all connections and run tests like
ssh connections, dhclient or dig (dns) connections, nmap port
scans, and then ensure the connections I expect from the tests
appear in the program's output.
- How would you make this solution better?
I'd improve the solution by making the functions more focused on
specific tasks, improving how I present the interface of each
function to each other to more specifically eliminate type
or value errors. I'd also allot more time to complete the task
since I wasn't able to find enough before the deadline.
- Is it possible for this program to miss a connection?
Yes, if the connection is brief enough so as not to last more than 10
seconds and thereby be missed by the most recent read of the
/proc/net/tcp file
- If you weren't following these requirements, how would you solve the problem of logging every new connection?
I would likely find a solution that leverages inotify to detect any change to the file and then read it,
rather than polling it every 10 seconds.
Level 2 Questions
- Why did you choose 'x' to write the build automation?
I would simply choose bash, as it's what I'm most familiar with and it
can reliably use the go build tools as well as invoke testing
systems like kvm/qemu, docker/podman and the like.
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Is there anything else you would test if you had more time?
If I had more time I'd spend it fleshing out my testing as outlined above and doing a more thorough job of structuring my data in the way that I've modeled it in my head - the choice of go definitely consigned me to reading more than writing with the little time I had. Should have gone with bash I think.
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What is the most important tool, script, or technique you have for solving problems in production? Explain why this tool/script/technique is the most important.
Level 3 Questions
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If you had to deploy this program to hundreds of servers, what would be your preferred method and why?
I would use ansible and use git to clone, build, and install the script. This method is my preferred one because it's simple to troubleshoot in the event that I run into issues and ansible doesn't require a central orchestrator node. It's also the Infrastructure-as-code tool I'm most familiar with.
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What is the hardest technical problem or outage you've had to solve in your career? Explain what made it so difficult?