CentOS系统管理

代码说明：

说明：  CentOS系统管理，系统管理当中的常用命令及其说明文档。(The CentOS Project is a community-driven free software effort focused on delivering a robust open source ecosystem. For users, we offer a consistent manageable platform that suits a wide variety of deployments. For open source communities, we offer a solid, predictable base to build upon, along with extensive resources to build, test, release, and maintain their code.)