Clean leaked Docker processes

clean_leaked_docker_procs

#!/usr/bin/env ruby

# Clean all those processes that belongs to a Docker namespace, but that container no longer exists

def all_procs
  Dir['/proc/*'].select {|d| /\/proc\/\d+/.match(d) }.map { |pdir| pdir.split('/')[-1].to_i }
end

def docker_procs
  all_procs.select { |p| File.read('/proc/' + p.to_s + '/cgroup').include? 'docker' }
end

def leaked_docker_procs
  docker_procs.select do |p|
    container = File.read('/proc/' + p.to_s + '/cgroup').split('/')[-1].chomp
    !system("docker inspect #{container} 2>&1 >/dev/null")
  end
end

if leaked_docker_procs.none?
  puts "No leaked Docker processes"
  exit(0)
end

# Term them all
leaked_docker_procs.each do |p|
  puts "Sent TERM signal to #{p}"
  Process.kill('TERM', p)
end

sleep 10

# Kill them all
leaked_docker_procs.each do |p|
  puts "Sent KILL signal to #{p}"
  Process.kill('KILL', p)
end