Problem:
You want to install ruby and the gem package manager in Alpine linux, but running apk install ruby rubygems shows you that the package doesn’t exist
/ # apk add ruby rubygems
ERROR: unable to select packages:
rubygems (no such package):
required by: world[rubygems]Solution:
gem is included in the ruby package. So the only command you need to run is
apk update apk add ruby
Example output:
/ # apk add ruby (1/7) Installing ca-certificates (20191127-r5) (2/7) Installing gdbm (1.19-r0) (3/7) Installing gmp (6.2.1-r0) (4/7) Installing readline (8.1.0-r0) (5/7) Installing yaml (0.2.5-r0) (6/7) Installing ruby-libs (2.7.3-r0) (7/7) Installing ruby (2.7.3-r0) Executing busybox-1.32.1-r6.trigger Executing ca-certificates-20191127-r5.trigger OK: 928 MiB in 154 packages
After doing that, you can immediately use both ruby and gem.