Use Alpine Linux for Tiny Images

[kojiromike]

I saw there was a PR for using Debian instead of the PHP official images. There's another official image that I think is very useful for building good base images: Alpine. For comparison:

# Current images
$ docker images | grep composer/composer
composer/composer                                   base                eb1df2aafe51        3 weeks ago         521.9 MB
composer/composer                                   1.0.0-alpha8        aa4d3eabda20        3 weeks ago         522.9 MB
composer/composer                                   1.0.0-alpha10       11b069d27b51        3 weeks ago         523 MB
composer/composer                                   latest              b87b6a34ca39        3 weeks ago         523 MB
composer/composer                                   1.0.0-alpha9        58acc7adbc48        3 weeks ago         523 MB

# Alpine images
$ docker images | grep composer/composer
composer/composer                                   1.0.0-alpha8        5b8d2ca4148a        14 minutes ago      22.57 MB
composer/composer                                   1.0.0-alpha9        fc5edf265f13        14 minutes ago      22.64 MB
composer/composer                                   1.0.0-alpha10       e858b3a69ef1        14 minutes ago      22.68 MB
composer/composer                                   latest              e9eb902514ea        17 minutes ago      22.72 MB
composer/composer                                   base                2bf3879927f9        17 minutes ago      21.6 MB

[RobLoach]

Wow, it ends up being about the same size as the Composer install file.

@cbeier @boedy This is looking pretty good! Mind some additional testing before this gets merged in?

[RobLoach]

@kojiromike There were some additional extensions introduced in #18 at https://github.com/RobLoach/docker-composer/pull/18/files#diff-9191b36467823e825f341c2f13a49c61R6 , not sure how much we really need them though. Testing locally seemed pretty good.

[kojiromike]

@RobLoach So in thinking about this, I definitely missed git, but maybe I should install the commands for all the supported vcs systems. That does kick the image sizes up to ~90MB, but still respectably small. What do you think?

[kojiromike]

OK, the last commit has support for everything but Perforce, including unrar and pear.

$ docker images | grep composer/composer
composer/composer                                   1.0.0-alpha8        0a61c00d0e9e        6 minutes ago       90.07 MB
composer/composer                                   1.0.0-alpha9        ad14c95ceb13        6 minutes ago       90.15 MB
composer/composer                                   1.0.0-alpha10       14cb66d0231f        6 minutes ago       90.18 MB
composer/composer                                   latest              f7e30f27d6d5        6 minutes ago       90.22 MB
composer/composer                                   base                d5f637f79af5        6 minutes ago       89.11 MB

[sjparkinson]

I'd love to see this merged, currently the image is ~500MB which this change really improves upon!

[deizel]

Might want to wait for docker-library/php/pull/176 now?

[andypost]

I suppose better to commit that and file follow-up to wait php containers based on alpine
that will save a lot of time

[derimagia]

php:7.0-alpine is in now, are we waiting on anything else?

[pirog]

+1

[ozbillwang]

can this be alpine:3.3?

[RobLoach]

The approach taken in #56 is a bit more verbose, so that is now merged. Thank you, @kojiromike, for pushing this forwards. 👍

[kojiromike]

👍