Dirk , 8 months ago

Yep! The names are basically just a convenient way for referencing a user or group ID.

Under normal circumstances you should let the system decide what IDs to use, but in the confined environment of a docker container you can do pretty much what you want.

If you really, really, really want to create a user and group just set the IDs manually:

<span style="color:#323232;">FROM alpine:latest
</span><span style="color:#323232;">COPY myscript.sh /app/myscript.sh
</span><span style="color:#323232;">RUN addgroup -g 10001 mycoolgroup && adduser -D -u 10000 -G mycoolgroup mycooluser
</span><span style="color:#323232;">USER mycooluser:mycoolgroup
</span><span style="color:#323232;">CMD ["sh", "/app/myscript.sh"]
</span>

Just make sure to stay at or above 10000 so you won’t accidentally re-use IDs that are already defined on the host.