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More often than not (sadly) I struggle with the next error message at my amazon aws instances:
\nunable to create '/something/something.tmp': No space left on device

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So, disk space issue… probably big log files that needs to be wiped or something like that? not always that easy.

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How to diagnose the issue

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When I ran df -H the output says that I still have some space left, so what is it?

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Well, is possible that is the inodes allocation. Run df -i to check them out.\nIf you find that you are at 100% or close to it, you need to get rid of them.

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How to locate the files to remove

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Where are they at? You can try to run this script (that doesnt needs to create a tmp file for it, since we dont have space left for that)

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cd /\nsudo find . -xdev -type f | cut -d "/" -f 2 | sort | uniq -c | sort -n
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Common cause: linux-headers inodes

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But, you can save some time if you first try for the most common source of this issue… old linux-headers

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They are located at /usr/src/ folder, just run a ll and delete some to recover some inodes space (you wont be able to purge them using apt-get if you are at 100% disk usage). Don’t delete them all they are used by linux, just get rid of some old versions that may be lingering there.

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So, for example, run:

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sudo rm -rf  linux-headers-4.4.0-130/
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Then you can try to purge some of them using sudo apg-get -f autoremove (and then manually remove old ones that weren’t removed that way)

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TLDR;

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Check if the issue are the inodes by running df -i

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If its at 100% or close to it, try removing old linux-headers to recover some space. Don’t go crazy on this step, try removing only 1 of the oldest images and then run sudo apt-get -f autoremove

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They are located at /usr/src/ folder (you can remove them with rm -rf)

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