https://www.centos.bz/2018/03/centos7%E6%90%AD%E5%BB%BAgit%E5%8F%8A%E5%AE%89%E8%A3%85%E4%BD%BF%E7%94%A8/
https://www.cnblogs.com/qiezuimh/p/11440506.html
https://www.cnblogs.com/watchslowly/p/11309052.html
https://www.cnblogs.com/xiaowei8/p/11935695.html
https://www.ahwgs.cn/sentry-start.html