同时将存储库代码部署到多台机器上

My question is: How do you guys deploy the same code from whatever [D]VCS you use on multiple machines? Do you have an automated deployment system and if so what's that? Is it built in-house? Are there out there any tools that can do this automatically? I am asking because I am pretty bored updating up to 20 machines every time I make some modifications.My question is: How do you guys deploy the same