SSH to bounce jobs

Code to SSH to another box, kill the old process and bring up a new one.

SSH, source the login file and cd to the right directory:

ssh -f user@somebox " . ./.bashrc; cd /apps/myapp/;


Kills the old process:

cat ../pid | xargs kill;


Calls startMyApp and pipes stdout, stderr to files. Creates a file called pid containing the process ID of this process:

nohup ./startMyApp 1>../stdout 2>../stderr & echo $! > ../pid


Putting it all together:

ssh -f user@somebox " . ./.bashrc; cd /apps/myapp/; cat ../pid | xargs kill; sleep 10; nohup ./startMyApp 1>../stdout 2>../stderr & echo $! > ../pid' > startMyAppRemote.log


ssh in a loop

Runs the command 'ls' on several machines and stores the results in output.txt


while read host; do
echo "running on $host"
ssh -n $host "ls " >> output.txt;
done < boxes.txt


where boxes.txt is a file containing a list of machines to ssh to

advanced reading

Alternative:

for loop in {281..284}
do
echo "running on frread@nygeqgd0$loop.us.db.com"
ssh -n frread@nygeqgd0$loop.us.db.com "ls " >> output.txt;
done


2nd Alternative:

for loop in `seq 281 284`

more bash loops