The groovy code will use the JSch library to connect to an EC2 instance, run the whoami and hostname commands, then print the results to the console:
@Grab(group='com.jcraft', module='jsch', version='0.1.49')
import com.jcraft.jsch.*
JSch jsch=new JSch();
jsch.addIdentity("/your path to your pem/gateway.pem");
jsch.setConfig("StrictHostKeyChecking", "no");
//enter your own EC2 instance IP here
Session session=jsch.getSession("ec2-user", "54.xxx.xxx.xxx", 22);
session.connect();
//run stuff
String command = "whoami;hostname";
Channel channel = session.openChannel("exec");
channel.setCommand(command);
channel.setErrStream(System.err);
channel.connect();
InputStream input = channel.getInputStream();
//start reading the input from the executed commands on the shell
byte[] tmp = new byte[1024];
while (true) {
while (input.available() > 0) {
int i = input.read(tmp, 0, 1024);
if (i < 0) break;
print(new String(tmp, 0, i));
}
if (channel.isClosed()){
println("exit-status: " + channel.getExitStatus());
break;
}
sleep(1000);
}
channel.disconnect();
session.disconnect();
Here's another example of how to make the same connection, but through a gateway ssh tunnel (NAT bastion): https://gist.github.com/scoroberts/5605655
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