If you use configuration management already (Puppet, Chef, Ansible), you can skip this tip.이미 설정 관리 도구(configuration management, puppet, chef, ansible 등)를 사용하는 경우, 이 팁을 생략할 수 있다.If you don’t use configuration management tools yet, you should! Managing a handful of servers by parallel-ssh may work now, but it will become a nightmare as you grow your cluster. It is almost impossible to edit 30 con..