You can use your own scripts and cron, and it will work if you have not so many servers there.
You can use WebMin but it will not help you much with configuring multiple servers at the same time.
You can use configuration management systems like Puppet, Chef or Ansible, but you'll need to spent much of the time to learn them.
There is no silver bullet here.
I'd write the article about that problem, take a look here.