Is there any software/way for Linux to run one command and get it executed at 10 web servers?

bmxakias · 04-13-2018, 07:50 PM

Hello

Is there any software/way for Linux to run one command and get it executed at 10 web servers at the same time?

I know about tmux and terminator but if i am not wrong i have to run the command on every opened shell window....

A commercial solution also is not a problem as a recommendation....

Thank you

frankbell · 04-13-2018, 08:09 PM

Take a look at clusterssh. I have heard it highly recommended by a Linux sysadmin.

BillT440 · 04-14-2018, 11:12 AM

I use omnitty. It doesn't need X.

http://omnitty.sourceforge.net/

-Bill

bmxakias · 04-14-2018, 12:33 PM

Thanks for your replies

clusterssh seems a bit better than omnitty ....

I will wait for any other possible recommendations....

jmgibson1981 · 04-16-2018, 06:43 AM

For me at home i just run ssh in a for loop to my machines. Never thought to look at other solutions. Something like this?

Code:

for machine in "$@" ; do
  ssh "$USER"@"$machine" "command" &
done
exit 0

I'm hoping someone will suggest a better alternative than this. Seems like a hack, but it works for my usage.

If multiple command lines to run then use a function.

Code:

myfunction () {
  ssh "$USER"@"$1" "command"
  ssh "$USER"@"$1" "command2"
  ssh "$USER"@"$1" "command3"
}

for machine in "$@" ; do
  myfunction "$machine" &
done
exit 0

TenTenths · 04-16-2018, 07:46 AM

We manage 200+ systems with the Open Source version of Rundeck

MadeInGermany · 04-18-2018, 01:07 AM

Quote:

Originally Posted by jmgibson1981

For me at home i just run ssh in a for loop to my machines. Never thought to look at other solutions. Something like this?

Code:

for machine in "$@" ; do
  ssh "$USER"@"$machine" "command" &
done
exit 0

I'm hoping someone will suggest a better alternative than this. Seems like a hack, but it works for my usage.

If multiple command lines to run then use a function.

Code:

myfunction () {
  ssh "$USER"@"$1" "command"
  ssh "$USER"@"$1" "command2"
  ssh "$USER"@"$1" "command3"
}

for machine in "$@" ; do
  myfunction "$machine" &
done
exit 0

Maybe it is more straight to bundle the commands

Code:

mycommands="
command
command2
command3
"

for machine in "$@" ; do
  ssh "$USER"@$machine" "$mycommands" &
done

BTW bash puts "$machine" as job name.
So the jobs command is not giving good information.
Every other shell does it better, substitutes each $machine to the value before putting it into the job list!

pan64 · 04-18-2018, 01:11 AM

for 6 servers I would also recommend a for cycle or similar. For really big systems (like tens, hundreds of servers) you might try ansible.
or try this: https://www.tecmint.com/using-dsh-di...iple-machines/

Bller · 04-19-2018, 06:24 AM

Automate the task with Ansible, it will use SSH to run any command on multiple servers which you define within an "Inventory" File.

More about this here :

https://www.ansible.com/

Hope it helps

Cheers !

wpeckham · 04-19-2018, 07:09 AM

Quote:

Originally Posted by bmxakias

Hello

Is there any software/way for Linux to run one command and get it executed at 10 web servers at the same time?

I know about tmux and terminator but if i am not wrong i have to run the command on every opened shell window....

A commercial solution also is not a problem as a recommendation....

Thank you

Yes. Many.
Look up "mpssh" as one example.

Habitual · 04-19-2018, 10:30 AM

The terminator terminal-emulator has a "broadcast" feature,
Send one command to "tabs"

https://unix.stackexchange.com/quest...simultaneously

rnturn · 04-13-2019, 11:18 AM

Quote:

Originally Posted by frankbell

Take a look at clusterssh. I have heard it highly recommended by a Linux sysadmin.

Heh... I might have been that admin. However, I just built clusterssh on a recent Tumbleweed installation and it failed to pass all the tests. I installed it anyway and it fails to pass along my credentials and prompts for a password in all the xterms it pops up. (Oh good! More debugging!) If it even pops them up, that is. Tools like Ansible (recommended in another reply) might be OK for some things but being able to do an ad hoc command on a bunch of systems and inspect the responses is invaluable. I haven't seen any Linux distributions include clusterssh/cssh in any of their repositories. Pity.

Chuck56 · 04-14-2019, 08:17 AM

I used clusterssh in the past to manage 6 servers, both physical and containers. Clusterssh worked great but required me to install too many perl dependencies on Slackware. I switched to "tmux with tm", a helper script found here: https://blog.ganneff.de/2013/03/tmux...ust-nicer.html and found it worked for me without needing additional dependencies.

I like both clusterssh and "tmux with tm" for a small group of servers. They both can multiplex commands to all servers simultaneously or switch back and forth from non-multiplex mode to isolate commands to a specific server. Since I found "tmux with tm" I haven't looked back to use clusterssh.

Adrianali · 04-16-2019, 05:02 AM

Quote:

Originally Posted by jmgibson1981

For me at home i just run ssh in a for loop to my machines. Never thought to look at other solutions. Something like this?

Code:

for machine in "$@" ; do
  ssh "$USER"@"$machine" "command" &
done
exit 0

I'm hoping someone will suggest a better alternative than this. Seems like a hack, but it works for my usage.

If multiple command lines to run then use a function.

Code:

myfunction () {
  ssh "$USER"@"$1" "command"
  ssh "$USER"@"$1" "command2"
  ssh "$USER"@"$1" "command3"
}

for machine in "$@" ; do
  myfunction "$machine" &
done
exit 0

An interesting option to the 'for' cycle is 'parallel' command.

tyler2016 · 04-17-2019, 06:51 AM

I use the community version of SaltStack to manage my machines.