I’ve had Discourse installed for a while via docker and performed many upgrades in the last few years. Now I ended up with quite a few docker images:
# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
local_discourse/app latest a779708720a4 2 months ago 2.68GB
discourse/base 2.0.20190906-0522 6da16759d83d 3 months ago 2.29GB
discourse/base 2.0.20190625-0946 2b3a5b47565f 6 months ago 1.93GB
discourse/base 2.0.20190505-2322 ed87227f60d2 7 months ago 1.91GB
discourse/base 2.0.20190217 9c24db193c37 10 months ago 1.92GB
discourse/base 2.0.20181031 ea31cd77735a 13 months ago 1.88GB
discourse/base 2.0.20180802 d6f8b6029227 16 months ago 1.74GB
discourse/base 2.0.20180717 3af2eb204be0 17 months ago 1.71GB
discourse/base 2.0.20171231 3925ef3919cc 24 months ago 1.73GB
discourse/base 2.0.20170728 184b98f3b1d2 2 years ago 1.81GB
discourse/base 2.0.20170531 4aa3fe49ae44 2 years ago 1.66GB
discourse/discourse 1.3.10 1881a9bd3afd 2 years ago 1.54GB
Surely not all are still needed, right? If I wanted to keep just the bare minimum, could all the discourse/base and that last discourse/discourse image be pruned?
I’m confused about the different image names local_discourse/app, discourse/base, discourse/discourse …
Could someone experienced provide a general “housekeeping” howto for keeping only the last, say, 3 images? I’m not a docker expert …