Re^2: Net::OpenSSH fastest way to reconnect to a rebooted machine?

What you've described is exactly what I'm trying to figure out how to do. The question is how do I test that the connection has either succeeded or failed? I tried this, since the Net::OpenSSH documentation says that a failure returns undef or an empty list:

 $ssh{$host} = Net::OpenSSH->new($host, master_opts => [-i => "/path/t
+o/key"]);
    if(defined $ssh{$host}) {
      print STDOUT "SSHD is back up. Continuing...\n";
    }
    else {
      print STDOUT "Still waiting for SSH. Retrying in 5 seconds...\n"
+;
      sleep 5;
    }
[download]

This fails though. Apparently the "no route to host" message that comes back from the failed connection attempt is enough to define $ssh{$host}. What's a good way to test to see if the connection is successful?

Comment on Re^2: Net::OpenSSH fastest way to reconnect to a rebooted machine? Download Code

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Re^3: Net::OpenSSH fastest way to reconnect to a rebooted machine? by salva (Canon) on May 17, 2011 at 20:26 UTC
Use the `error` method to see if some error happened. `for my $host (...) { $ssh{$host} = Net::OpenSSH->new($host, ...); if($ssh{$host}->error) { print STDOUT "Still waiting for SSH. Retrying in 5 seconds...\ +n"; sleep 5; redo; } else { print STDOUT "SSHD is back up. Continuing...\n"; } }` [download] If you are starting several connections in parallel, you can also use the `wait_for_master` method.	[reply] [d/l] [select]
Re^4: Net::OpenSSH fastest way to reconnect to a rebooted machine? by regan99 (Initiate) on May 17, 2011 at 21:26 UTC
That worked! Thanks for the reply (and the great module).	[reply]
Re^3: Net::OpenSSH fastest way to reconnect to a rebooted machine? by Anonymous Monk on Nov 19, 2012 at 16:49 UTC
Passing in parameters works for me, without having to loop & check the error condition: `my $ssh = Net::OpenSSH->new( $username . "\@" . $host, key_path => $key_path, master_opts => [-o => "ConnectionAttempts +=30", -o => "ConnectTimeout=10"] );` [download]	[reply] [d/l]