linux切换yum

rpm -qa yum
rpm -qa | grep yum | xargs rpm -e --nodeps

1、下载yum安装文件 (若没有此包，可以去阿里镜像或网易镜像下载)wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-3.4.3-161.el7.centos.noarch.rpm
wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-50.el7.noarch.rpm
wget http://mirrors.163.com/centos/7/os/x86_64/Packages/python-iniparse-0.4-9.el7.noarch.rpm
2、进行安装yum
rpm -ivh python-iniparse-0.4-9.el7.noarch.rpm
rpm -ivh yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
rpm -ivh yum-3.4.3-168.el7.centos.noarch.rpm yum-plugin-fastestmirror-1.1.31-54.el7_8.noarch.rpm
注意：最后两个包必需同时安装，否则会相互依赖。
3、更新repo文件
进入 /etc/yum.repos.d文件夹下，
修改配置文件名mv CentOS7-Base-163.repo CentOS7-Base.repo

首先,yum list --showduplicate | grep java-1.8 | grep devel 查看 有哪些可安装的jdk1.8 开发工具 包,如下:

选择一个适合自己的yum安装: yum install java-1.8.0-openjdk-devel.x86_64 -y