Running commands on multiple servers [duplicate]

Question

I want to execute a process on multiple servers. I am using the following wrapper script. The script moves to servers one at a time. I would like to change it so it can execute on multiple servers. Is there way to do it?

#!/bin/bash
for ip in $(<ALL_SERVERS_IP); do
    # Tell the remote server to start bash, but since its
    # standard input is not a TTY it will start bash in
    # noninteractive mode.
    ssh -q "$ip" bash <<-'EOF'
        printf "%s\n" ================== "$(hostname) ::: Current date : $(date)" \
                            ==================
        ./remote 
    EOF
done

Answer 1

Yes. Try pdsh, which will execute a command on multiple remote hosts simultaneously. Your task could be written like so:

pdsh -w ssh:$(echo $(<ALL_SERVERS) | sed -e 's/ /,/g') 'printf "%s\n" ...'

Answer 2

Sounds like you're looking for GNU Parallel. That's pretty much exactly what it was written for. In your case, you would do:

parallel ./remote --sshloginfile ALL_SERVERS_IP

The above assumes that ALL_SERVERS_IP is a text file with one IP or hostname per line. If they can have different logins, make the list like so:

[email protected]
[email protected]
[email protected]

Answer 3

I know some tools for that, but the easiest is Fabric. Take a look and tell me what do you think.