Question

How to change permissions to /tmp folder in Docker image

Hi! In my Dockerfile, I have this line:

RUN chmod go-w -R /tmp && mkdir /tmp/secrets

it builds successfully. On my local machine, this works. There is a folder under /tmp and the folder itself has the right permissions.

However, in my image on Digital Ocean Apps; /tmp is still marked with drwxrwxrwt root root and there is no directory /tmp/secrets

Why is it like this?

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Bobby Iliev
Site Moderator
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• February 28, 2022

Hi there,

I believe that /tmp is cleared after every restart meaning that once you start a container from that image, it will have a blank /tmp directory.

Alternatively, you could use /var/tmp as it does not get cleared after a restart.

I’ve just tested this with /var/tmp and it seems to be working as expected.

Best,

Bobby