Cannot install additional software after upgrade to 1.5 (docker)

[agross]

$ docker run eclipse-mosquitto:latest apk update
ERROR: Unable to lock database: No such file or directory
ERROR: Failed to open apk database: No such file or directory

$ docker run eclipse-mosquitto:1.5 apk update
ERROR: Unable to lock database: No such file or directory
ERROR: Failed to open apk database: No such file or directory

$ docker run eclipse-mosquitto:1.5.3 apk update
ERROR: Unable to lock database: No such file or directory
ERROR: Failed to open apk database: No such file or directory

This has been working before:

$ docker run eclipse-mosquitto:1.4.12 apk update
fetch http://dl-cdn.alpinelinux.org/alpine/v3.6/main/x86_64/APKINDEX.tar.gz
...

[ralight]

Ok, I guess I've taken reducing the image size down a bit too far. It's a shame, that optimisation saves ~6GB bandwidth per day. I'll sort it out.

[agross]

I have no idea how apk works but I guess it's OK to wipe the cache (and save bandwidth), but keep the data that is required to run an update (package sources?).

[ruimarinho]

Just remove rm -rf /build /etc/apk /lib/apk and use --no-cache in front of all apk commands so that it doesn't store state.

Another option would be to use multi-stage builds so that only compiled artifacts go into the final image. Much better for code maintainability.

[ralight]

docker-library/official-images#5031

[ralight]

Multi-stage builds are ok for normal docker images, but not for official images: docker-library/official-images#3383