http://www.perlmonks.org?node_id=11122297


in reply to Re^2: Net::OpenSSH reconnect master if conn. closed
in thread Net::OpenSSH reconnect master if conn. closed

I have added a new restart method for reestablishing the connection to the server in Net::OpenSSH version 0.80. It is something that should have been available a long time ago, but at first it was difficult to implement, then at some point I had to revamp the code managing the master process in order to fix several others bugs making it trivial but didn't though about adding it... until I read your post today!

Note that it is possible that a broken connection goes unnoticed until you actually try to use it. wait_for_master cheeks the local ssh master process but some kind of errors (for instance, a broken TCP connection), would go unnoticed. So to be sure you cover all the cases, you need to try running the command and if that fails, reconnect:

my $cmd = "..."; my $out = $ssh->capture({timeout => 120}, $cmd); unless (defined $out) { warn "unable to run command $cmd, retrying..."; $ssh->restart or die "Unable to restart SSH connection: " . $ssh->er +ror; $out = $ssh->capture({timeout => 120}, $cmd); unless (defined $out) { die "definitively, I can't run the command $cmd: " . $ssh->error; } }
If $cmd does some non-atomic operation, it is a long running operation you don't want to run twice, etc., you may like to use a harmless dummy command as "echo hello" instead.

Replies are listed 'Best First'.
Re^4: Net::OpenSSH reconnect master if conn. closed
by Bolemo (Acolyte) on Sep 28, 2020 at 19:42 UTC
    That is great, thank you!