Run many java applications via ssh in a bash script

Question

I'm trying to optimize some experiments with a Java application. The same application is on many machines. I want to run all of 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  ubuntu@host "java java-app.jar" > /data/some-logs.log 
  ((COUNTER++))
  ((IP_BEGINS++))
done

However when I run the script I have to wait a moment and press Ctrl+C for every machine. How can I run every aplication on background?

I'm a big fan of Fabric for remote execution: see docs.fabfile.org/en/1.12.1/usage/parallel.html — jarmod
– jarmod, Commented Aug 8, 2019 at 23:50
Read this maketecheasier.com/run-bash-commands-background-linux — kaqqao
– kaqqao, Commented Aug 9, 2019 at 0:31

stringy05 · Accepted Answer · 2019-08-09 05:32:50Z

3

prefix with nohup and append a & to the command, that will run it in the background.

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

You might need to muck around with the quotes and placements of the & to make sure the remote ssh command gets backgrounded and not your local ssh

EDIT - I fixed the answer based on your comment. Also added the stderr redirect to the same log file, that might help when things go wrong

edited Aug 9, 2019 at 5:32

answered Aug 9, 2019 at 1:28

stringy05

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1 Comment

lak Over a year ago

Thank you! It worked. However I had to change the prefix and & as you mentioned. ssh ubuntu@host "nohup java java-app.jar > /data/some-logs.log &"

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