[Rails] SporkでAddress already in use - bind(2)エラーが出た場合の対処 ref: http://qiita.com/kidachi_/items/4bea2a4e390130719826

file0.sh

$  bundle exec spork
Using RSpec, Rails
Preloading Rails environment
Loading Spork.prefork block...
Address already in use - bind(2) (Errno::EADDRINUSE)
/Users/taniguchidaiki/.rbenv/versions/2.0.0-p195/lib/ruby/2.0.0/drb/drb.rb:879:in `initialize'
/Users/taniguchidaiki/.rbenv/versions/2.0.0-p195/lib/ruby/2.0.0/drb/drb.rb:879:in `open'
/Users/taniguchidaiki/.rbenv/versions/2.0.0-p195/lib/ruby/2.0.0/drb/drb.rb:879:in `open_server'
/Users/taniguchidaiki/.rbenv/versions/2.0.0-p195/lib/ruby/2.0.0/drb/drb.rb:764:in `block in open_server'
/Users/taniguchidaiki/.rbenv/versions/2.0.0-p195/lib/ruby/2.0.0/drb/drb.rb:762:in `each'
/Users/taniguchidaiki/.rbenv/versions/2.0.0-p195/lib/ruby/2.0.0/drb/drb.rb:762:in `open_server'
/Users/taniguchidaiki/.rbenv/versions/2.0.0-p195/lib/ruby/2.0.0/drb/drb.rb:1373:in `initialize'
/Users/taniguchidaiki/.rbenv/versions/2.0.0-p195/lib/ruby/2.0.0/drb/drb.rb:1664:in `new'
/Users/taniguchidaiki/.rbenv/versions/2.0.0-p195/lib/ruby/2.0.0/drb/drb.rb:1664:in `start_service'
/Users/taniguchidaiki/.rbenv/versions/2.0.0-p195/lib/ruby/gems/2.0.0/gems/spork-1.0.0rc4/lib/spork/server.rb:30:in `listen'
/Users/taniguchidaiki/.rbenv/versions/2.0.0-p195/lib/ruby/gems/2.0.0/gems/spork-1.0.0rc4/lib/spork/server.rb:21:in `run'
/Users/taniguchidaiki/.rbenv/versions/2.0.0-p195/lib/ruby/gems/2.0.0/gems/spork-1.0.0rc4/lib/spork/runner.rb:76:in `run'
/Users/taniguchidaiki/.rbenv/versions/2.0.0-p195/lib/ruby/gems/2.0.0/gems/spork-1.0.0rc4/lib/spork/runner.rb:10:in `run'
/Users/taniguchidaiki/.rbenv/versions/2.0.0-p195/lib/ruby/gems/2.0.0/gems/spork-1.0.0rc4/bin/spork:10:in `<top (required)>'
/Users/taniguchidaiki/.rbenv/versions/2.0.0-p195/bin/spork:23:in `load'
/Users/taniguchidaiki/.rbenv/versions/2.0.0-p195/bin/spork:23:in `<main>'
No examples found.


Finished in 0.00013 seconds
0 examples, 0 failures

Randomized with seed 11942

file1.sh

$ ps ax|grep spork
85664 s006  T      0:04.00 ruby /Users/hoge/.rbenv/versions/2.0.0-p195/bin/spork
87228 s007  S+     0:00.00 grep spork

file2.sh

$ kill -9 85664
$ ps ax|grep spork
87233 s007  R+     0:00.00 grep spork

file3.sh

$  bundle exec spork
Using RSpec, Rails
Preloading Rails environment
Loading Spork.prefork block...
Spork is ready and listening on 8989!