安装golang1.15.14
下载：
wget https://download-ib01.fedoraproject.org/pub/epel/7/x86_64/Packages/g/golang-1.15.14-1.el7.x86_64.rpm
wget https://download-ib01.fedoraproject.org/pub/epel/7/x86_64/Packages/g/golang-src-1.15.14-1.el7.noarch.rpm
wget https://download-ib01.fedoraproject.org/pub/epel/7/x86_64/Packages/g/golang-bin-1.15.14-1.el7.x86_64.rpm用rpm安装
rpm -ivh golang-src-1.15.14-1.el7.x86_64.rpm
rpm -ivh golang-1.15.14-1.el7.x86_64.rpm golang-bin-1.15.14-1.el7.x86_64.rpm
#这两个必须同时安装，否则会报相互被依赖而安装失败。
#安装时还会报一些依赖问题，一般都可以用yum install解决。