I have a server running Ubuntu 12.04.5 LTS (Precise Pangolin). On that server I created a new Linux container:
$ sudo lxc-create -n mycontainer
After a while I decided to get rid of this container:
$ sudo lxc-destroy -n mycontainer
However I got the following error:
rm: cannot remove `/var/lib/lxc/mycontainer/rootfs/swapfile': Operation not permitted
I tried to delete the offending file manually:
$ sudo rm /var/lib/lxc/mycontainer/rootfs/swapfile
But, sure enough, this gave me the same error message.
I checked the extended file attributes with lsattr to make sure it wasn’t immutable:
$ sudo lsattr /var/lib/lxc/mycontainer/rootfs/swapfile -------------e- /var/lib/lxc/mycontainer/rootfs/swapfile
As an experiment I tried to overwrite the file:
$ echo '' > /var/lib/lxc/mycontainer/rootfs/swapfile
This gave me a new error message:
bash: /var/lib/lxc/mycontainer/rootfs/swapfile: Text file busy
So I tried to use lsof to get the pid of the process which is using the file:
$ sudo lsof /var/lib/lxc/mycontainer/rootfs/swapfile
This produced no output. I tried the same thing with fuser:
$ sudo fuser /var/lib/lxc/mycontainer/rootfs/swapfile
Again, no output.
I’ll also mention that I checked the size of the file:
$ sudo du -h /var/lib/lxc/mycontainer/rootfs/swapfile 1.1G /var/lib/lxc/mycontainer/rootfs/swapfile
What’s going on here and how do I get rid of this file?
swapfile gives a very strong hint as to the file’s purpose and what is using it.
That is: The system is using it as swap, because someone created the swap file and added it to the system with
Try removing it from active swap with
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