国内github经常无法访问，每次都要获取新的IP去改hosts文件，十分的麻烦，这里有个小工具直接运行就可以自动获取ip去修改host文件 源码地址：https://github.com/qq2279881628/github_visit_host_tool.git host工具
运维
更新jenkins时报错java.lang.IllegalStateException: An attempt to save the global configuration was made before it was loaded
今天更新jenkins时重启直接报错，java.lang.IllegalStateException: An attempt to save the global configuration was made before it was loaded 解决方法： 从jenkins官网下载最新的war包，然后把它覆盖到你jenkins的安装目录下jenkins.war重启就行了
