Ruby

SSH Parallel Remote Commands on Single Server

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Shows how to execute multiple commands in parallel on a single SSH server and retrieve the command output for each. Ruby

require 'chilkat'

success = false

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

ssh = Chilkat::CkSsh.new()

port = 22
success = ssh.Connect("the-ssh-server.com",port)
if (success != true)
    print ssh.lastErrorText() + "\n";
    exit
end

# Authenticate using login/password:
success = ssh.AuthenticatePw("theSshLogin","theSshPassword")
if (success != true)
    print ssh.lastErrorText() + "\n";
    exit
end

# Start several commands on the server.
channel1 = ssh.QuickCmdSend("df")
if (channel1 < 0)
    print ssh.lastErrorText() + "\n";
    exit
end

channel2 = ssh.QuickCmdSend("date")
if (channel2 < 0)
    print ssh.lastErrorText() + "\n";
    exit
end

channel3 = ssh.QuickCmdSend("echo hello world")
if (channel3 < 0)
    print ssh.lastErrorText() + "\n";
    exit
end

# Now collect the results of each command.
pollTimeoutMs = 50
numFinished = 0
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.
    channel = ssh.QuickCmdCheck(pollTimeoutMs)
    if (channel == -2)
        print ssh.lastErrorText() + "\n";
        exit
    end

    if (channel >= 0)
        print "---- channel " + channel.to_s() + " finished ----" + "\n";
        print ssh.getReceivedText(channel,"ansi") + "\n";
        numFinished = numFinished + 1
    end

end

# --------------
# Sample output:

# 	---- channel 105 finished ----
# 	hello world
# 
# 	---- channel 104 finished ----
# 	Thu Dec 22 17:43:58 CST 2016
# 
# 	---- channel 103 finished ----
# 	Filesystem    512-blocks      Used  Available Capacity  iused     ifree %iused  Mounted on
# 	/dev/disk2    2176716032 265739728 1910464304    13% 33281464 238808038   12%   /
# 	devfs                382       382          0   100%      662         0  100%   /dev
# 	map -hosts             0         0          0   100%        0         0  100%   /net
# 	map auto_home          0         0          0   100%        0         0  100%   /home
# 	/dev/disk3s2      374668    374668          0   100%    93665         0  100%   /Volumes/Google Chrome