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linuxunixoracle-sqldeveloperpuppetremote-server
James
James

Reputation: 191

Run a command in remote server

What would be the best way to run commands in remote servers? I am thinking of using SSH, but is there a better way than that? I used Red Hat Linux and I want to run the command in one of the servers, specify what other servers I want to have my command run, and it has to do the exact same thing in the servers specified. Puppet couldn't solely help, but I might be able to combine some other tool with Puppet to do the job for me.

Upvotes: 0

Views: 731

Answers (2)

Mike H
Mike H

Reputation: 160

It seems you are able to log on to the other servers without entering a password. I assume this is based on SSH keys, as described here: https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Deployment_Guide/s2-ssh-configuration-keypairs.html

You say another script is producing a list of servers. You can now use the following simple script to loop over the list:

for server in `./server-list-script`; do
  echo $server:
  ssh username@$server mkdir /etc/dir/test123
done >logfile 2>&1

The file "logfile" will collect the output. I'm pretty sure Puppet is able to do this as well.

Upvotes: 1

larsks
larsks

Reputation: 312858

Your solution will almost definitely end up involving ssh in some capacity.

You may want something to help manage the execution of commands on multiple servers; ansible is a great choice for something like this.

For example, if I want to install libvirt on a bunch of servers and make sure libvirtd is running, I might pass a configuration like this to ansible-playbook:

- hosts: all
  tasks:
    - yum:
        name: libvirt
        state: installed
    - service:
        name: libvirtd
        state: running
        enabled: true

This would ssh to all of the servers in my "inventory" (a file -- or command -- that provides ansible with a list of servers), install the libvirt package, start libvirtd, and then arrange for the service to start automatically at boot.

Alternatively, if I want to run puppet apply on a bunch of servers, I could just use the ansible command to run an ad-hoc command without requiring a configuration file:

ansible all -m command -a 'puppet apply'

Upvotes: 1

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