A Technical I.T./DevOps Blog
Problem scenario
You are trying to run an mkfs command. But you get “mkfs unable to open device /dev/nvme device or resource busy”. What should you do?
Solution
Are you 100% sure the target of the mkfs command is the one you want?
The target may be /dev/mapper/nvmeABC123 for example. Try to ascertain the destination (often the last argument) of the mkfs command.
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Problem scenario
You are trying to run a cryptsetup open command. You enter the passphrase, but you get “Requested offset is beyond real size of device.” What should you do?
Solution
Try starting over with that partition. Can you create a partition that is at least 16 MB? If it is less than that, or there are some overlapping partitions, that may be your problem.
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Continue reading “How Do You Troubleshoot “Requested offset is beyond real size of device”?”
Problem scenario
You run df and du. You see different amounts of CPU space that are free versus utilized. What should you do?
Possible Solution #1
Reboot the server. Rebooting may fix the problem.
Possible Solution #2
Run this command: lsof
Some files may be open that should not be. The lsof command should help you determine if a file’s utilization is lingering.
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Continue reading “How Do You Handle Discrepant Results from df and du Commands?”
Problem scenario
From a Python command prompt or when you run a Python program, you get the error message “no module named pandas”. You have used pip and pip3 to install pandas. What should you do?
Solution
Use “python3” instead of “python” to ensure you are using Python 3.
You may also want to see this posting.
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Continue reading “How Do You Troubleshoot The Message “no module named pandas”?”
Problem scenario
You use WordPress. You want to find (or identify) what theme you are using. What should you do?
Solution
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Continue reading “How Do You Determine What WordPress Theme Your Website Is Using?”
Problem scenario
You want to find a sport or buy shoes that incorporates your legs anthropometry. How do you find the ratio of your tibia’s length to your femur’s length?
Answer
Depending on your style of dress, personal trainers may not be able to guess your femur length. You do have to measure.
How do you measure the tibia (the bone between your ankle and knee) length?
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Continue reading “How Do You Find Your Tibia to Femur Ratio?”
Problem scenario
You see many strong people at the gym lift barefoot. Should you take your shoes off before squatting?
Possible Answer
It is not clear.
These articles give mixed treatment to squatting barefoot (with the top two being fairly favorable to the practice):
https://borntosweat.co/blog/the-benefits-of-barefoot-training-squatting-without-shoes/
Problem scenario
Ubuntu won’t boot. You get “nouveau drm failed to idle channel” upon boot up. What should you do?
Possible Solution #1
Press enter. You should then see a prompt to log in.
Possible Solution #2
Press Ctrl-Alt-F3
Possible Solution #3 (if it does not happen at boot up, but you see a similar message)
See this external posting,
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Continue reading “How Do You Troubleshoot “nouveau drm failed to idle channel” upon boot up?”
Question
You are trying to get a screw to get into a thread. It won’t start. How do you get the screw into the hole you are trying to screw-in?
Answer
Are the screws slightly too big? Did other screws come with the item you are working with? It could be that the screws are not the right ones. Sometimes there are hidden screws in a package or the wrong screws are in package (from a mistaken from the manufacturer).
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Continue reading “How Do You Get Screws to Start Screwing in?”
Problem scenario
You are logged into an e-commerce website or a utility website. When you click log out, the page refreshes. You never really log out (as you are logged back in automatically). What are you doing wrong?
Possible Solution
Close the web browser that does not log you out. Try a different web browser (e.g., use Firefox if a different web browser had the problem).
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Continue reading “How Do You Log Out of a Company’s Website?”