Java – Run many Java applications via ssh in bash scripts

I’m trying to optimize some experiments with Java applications. The same application on many machines. I want to run them via a bash script with ssh.

I have a bash script that has a while loop to run the application. Like this

while [ $COUNTER -lt $WORKERS ]
do
  ssh  [email protected] "java java-app.jar" > /data/some-logs.log 
  ((COUNTER++))
  ((IP_BEGINS++))
done

However, when I run the script, I have to wait a few moments and then press Ctrl+C on each machine. How do I run each app in the background?

Prefix with nohup and append & after the command, which will run it in the background.

while [ $COUNTER -lt $WORKERS ]
do
  ssh  [email protected] "nohup java -jar java-app.jar > /data/some-logs.log 2>&1 &"
  ((COUNTER++))
  ((IP_BEGINS++))
done

You may need to handle the quotation marks and position of the & to ensure that remote ssh commands are in the background and not local ssh

Edit – I revised the answer based on your comment. Stderr redirection is also added to the same log file, which may help if something goes wrong