Question

I have an app that sets creates EC2 instances – I have a resque task that will configure the server (via ssh) once it’s up and running:

    Net::SSH.start(server.dns_name, 'root', :keys => ['~/.ssh/testkey.pem'], :paranoid => false, :verbose => :debug) do |ssh|
         result = ssh.exec!("ls -l")
         puts result
    end

I get an error:

*** (Job{serverbuild} | ServerBuilder | [22]) failed: #<Errno::ECONNREFUSED: Connection refused - connect(2)>

If I run this from irb, or from my rails app, it’s connects just fine. Any thoughts?

Answer 1

It’s a timing issue – EC2 instances are “up” before the will accept ssh requests. I rescued the error retried again in 20 seconds (up to 5 times). working now.

  begin
     Net::SSH.start(server.dns_name.to_s, 'root', :keys => ['/Users/stevebrewer/.ssh/testkey.pem'], :paranoid => false) do |ssh|
       result = ssh.exec!("ls -la")
       puts result
     end
  rescue
     if(retries < 5)
       Resque.enqueue_at(20.seconds.from_now, ServerBuilder, server_id, retries + 1)
     end
  end