Docker - check within the container if a directory is mounted from the host or not

Question

I have a need to check if a directory in my running container is mounted from the host or not.
Example: using the docker run .... -v /host-data:/data .... command.

If not mounted, I want to warn the user that data on this directory will be lost when the container is terminated...

score 7 · Accepted Answer · answered Sep 21 '16 at 15:13

7

I found a rough, but simple solution.

mount | grep '/data'

will result in 0 if found (which means it's mounted).
I added it to my entry-point script and it works as expected.

Ideas for improvements are welcome!

I hope this helps.

answered Sep 21 '16 at 15:13

Eldad Assis

10,464
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This is brilliant and so very simple. Thanks! – Ryan Wheale Aug 16 '23 at 21:53

score 1 · Answer 2 · answered Aug 05 '21 at 17:00

1

   mountVar=`mount | grep "$BLA"`
   if [ -z "$mountVar" ]
   then
      echo "$BLA not mounted  exit"
      exit
   else      
      echo "$BLA  mounted "

   fi

answered Aug 05 '21 at 17:00

sherif

2,282
19
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Docker - check within the container if a directory is mounted from the host or not

2 Answers2

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