Script does not execute simultaneously in Linux

Question

I have 10 servers and I access them using jumpbox. I wrote a script for starting a service on each server. When I execute that script it's only run on one server and after pressing Ctrl+C it's executed on the next server and so on. I want to run it on all servers without pressing Ctrl+C.

This is my script:

#!/bin/bash
for i in `cat /etc/hosts | grep prod | awk '{print $2}'` ;
do
ssh $i "hostname && sudo service name start"
done;

Make sure your user is allowed to execute sudo service name start without entering a password. — Cyrus
– Cyrus, Commented Oct 22, 2016 at 18:20
I guess there is a problem with output redirection in your service script. — Cyrus
– Cyrus, Commented Oct 22, 2016 at 20:53
I, too, think you''re problems depend standard file redirections. You could try to add option -n to ssh and to end the command-line with &. As a last comment, you can replace the three sub-processes cat /etc/hosts | grep prod | awk '{print $2}' with just one sub-process awk '/prod/ {print $2}' /etc/hosts. — davidedb
– davidedb, Commented Oct 26, 2016 at 12:18

Cyrus · Accepted Answer · 2016-10-22 18:47:43Z

1

Use & to fork new process.

#!/bin/bash
for i in `cat /etc/hosts | grep prod | awk '{print $2}'` ;
do
ssh $i "hostname && sudo service name start" &
done;

edited Oct 22, 2016 at 18:47

Cyrus

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answered Oct 22, 2016 at 18:17

Shashwat Kumar

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