Node.js

SSH Parallel Remote Commands on Multiple Servers

See more SSH Examples

Shows how to execute a command in parallel on multiple servers. Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    //  This example requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    //  Executing a command on multiple servers simultaneously is straightforward.
    //  It's just a matter of using one SSH object per server..
    var ssh1 = new chilkat.Ssh();
    var ssh2 = new chilkat.Ssh();
    var ssh3 = new chilkat.Ssh();

    var port = 22;
    success = ssh1.Connect("ssh-server1.com",port);
    if (success !== true) {
        console.log(ssh1.LastErrorText);
        return;
    }

    //  Authenticate using login/password:
    success = ssh1.AuthenticatePw("sshLogin1","sshPassword1");
    if (success !== true) {
        console.log(ssh1.LastErrorText);
        return;
    }

    //  Connect and authenticate with 2 more servers.
    //  For brevity, the success/failure won't be checked...
    success = ssh2.Connect("ssh-server2.com",port);
    success = ssh2.AuthenticatePw("sshLogin2","sshPassword2");
    success = ssh3.Connect("ssh-server3.com",port);
    success = ssh3.AuthenticatePw("sshLogin3","sshPassword3");

    //  Note: If we wanted, we could've used ConnectAsync and AuthenticatePwAsync
    //  to do the connecting and authenticating in parallel...

    //  The command to be run on each SSH server will sleep for 5 seconds,
    //  and then show the current system date/time.
    var cmd = "sleep 5; date";

    //  Start each command
    var ssh1Channel = ssh1.QuickCmdSend(cmd);
    if (ssh1Channel < 0) {
        console.log(ssh1.LastErrorText);
        return;
    }

    //  For brevity, we're not checking the return values here:
    var ssh2Channel = ssh2.QuickCmdSend(cmd);
    var ssh3Channel = ssh3.QuickCmdSend(cmd);

    //  OK, at this point the command is running simultaneously on each server.

    //  Now collect the results of each command.
    var pollTimeoutMs = 50;
    var numFinished = 0;
    var channel;
    //  Note: You would rewrite this code to use arrays.
    var ssh1Finished = false;
    var ssh2Finished = false;
    var ssh3Finished = false;
    while (numFinished < 3) {
        //  Check to see if anything has finished.
        //  QuickCmdCheck returns -1 if there are no errors and nothing else finished
        //  QuickCmdCheck returns -2 if there was an error (such as a lost connection)
        //  QuickCmdCheck returns a channel number if a channel finished.
        if (ssh1Finished !== true) {
            channel = ssh1.QuickCmdCheck(pollTimeoutMs);
            if (channel == -2) {
                console.log(ssh1.LastErrorText);
                return;
            }

            if (channel == ssh1Channel) {
                console.log("---- ssh1 channel " + channel + " finished ----");
                console.log(ssh1.GetReceivedText(channel,"ansi"));
                numFinished = numFinished+1;
                ssh1Finished = true;
            }

        }

        if (ssh2Finished !== true) {
            channel = ssh2.QuickCmdCheck(pollTimeoutMs);
            if (channel == -2) {
                console.log(ssh2.LastErrorText);
                return;
            }

            if (channel == ssh2Channel) {
                console.log("---- ssh2 channel " + channel + " finished ----");
                console.log(ssh2.GetReceivedText(channel,"ansi"));
                numFinished = numFinished+1;
                ssh2Finished = true;
            }

        }

        if (ssh3Finished !== true) {
            channel = ssh3.QuickCmdCheck(pollTimeoutMs);
            if (channel == -2) {
                console.log(ssh3.LastErrorText);
                return;
            }

            if (channel == ssh3Channel) {
                console.log("---- ssh3 channel " + channel + " finished ----");
                console.log(ssh3.GetReceivedText(channel,"ansi"));
                numFinished = numFinished+1;
                ssh3Finished = true;
            }

        }

    }

    //  --------------
    //  Sample output:

    //  	---- ssh2 channel 101 finished ----
    //  	Fri Dec 23 00:25:48 UTC 2016
    //  
    //  	---- ssh3 channel 102 finished ----
    //  	Thu Dec 22 18:25:12 CST 2016
    //  
    //  	---- ssh1 channel 100 finished ----
    //  	Thu Dec 22 18:25:48 CST 2016

}

chilkatExample();