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I got this new vserver and I decided to use it as Gentoo buildslave. Just after installing the image I had no working ssh. Reading the log I stumbled across this:

Jun 17 14:46:17 vadmin234 sshd[3519]: Server listening on :: port 22.
Jun 17 14:46:17 vadmin234 sshd[3519]: error: Bind to port 22 on 0.0.0.0 failed: Address already in use.
Jun 17 14:46:23 vadmin234 sshd[3519]: Received signal 15; terminating.

Looks like sshd binds port 22 on :: and tries to bind then the same port on 0.0.0.0 which obviously can't work. This is overall a bit cumbersome, because I don't have any ipv6 address for this machine.

A solution is either to remove ipv6 support from the kernel or even better say sshd which address it should use:

ListenAddress 0.0.0.0

Installing Ruby 19 isn't an easy task, the (hard)masking stuff in Gentoo is really a nightmare. The API of Ruby changed a lot from 18 to 19, therefore you can easily say it's not compatible. Until Gentoo has a better version management for slotted Ruby is basically, it's just masked and up to the user installing it if needed and live with the consequences.

There exists the fancy RUBY_TARGETS mechanism, which is intended to allow packages be build for different flavors like ruby18, ruby19, jruby and ree (Ruby Enterprise Edition). According to the manpage and the nice guys in #gentoo-ruby on Freenode you just need to add RUBY_TARGETS="ruby19" in your /etc/make.conf - it doesn't.

After a bit of talk and testing various possible solutions suggestions I found it: You need to override the mask of the flag for ruby19 which is ruby_targets_ruby19 and this can be done in /etc/portage/profile/use.mask.

To make long story short just do this:

Numbers: on /off1 mkdir -p /etc/portage/profile
2 echo "dev-lang/ruby ~x86" >> /etc/portage/package.keywords
3 echo "dev-lang/eselect-ruby ~x86" >> /etc/portage/package.keywords
4 echo "dev-lang/ruby" >> /etc/portage/package.unmask
5 echo "dev-lang/eselect-ruby" >> /etc/portage/package.unmask
6 echo "-ruby_targets_ruby19" >> /etc/portage/profile/use.mask
7 echo 'RUBY_TARGETS="ruby19"' >> /etc/make.conf

In case you also need rake:

Numbers: on /off1 echo "dev-ruby/rake ~x86" >> /etc/portage/package.keywords
2 echo "dev-ruby/rubygems ~x86" >> /etc/portage/package.keywords
3 echo "dev-ruby/rake" >> /etc/portage/package.unmask
4 echo "dev-ruby/rubygems" >> /etc/portage/package.unmask