一、配置ip：
1、用vi编辑器编辑文件/etc/sysconfig/network-scripts/ifcfg-ens33
1、用vi编辑器编辑文件/etc/sysconfig/network-scripts/ifcfg-ens33
vi /etc/sysconfig/network-scripts/ifcfg-ens33
2、修改或加入下列内容：
ONBOOT=yes IPADDR=192.168.200.149 PREFIX=24 GATEWAY=192.168.200.2 DNS1=192.168.200.2
3、重启网络
systemcrl restart network
二、更换yum源为国内源
1、卸载redhat的yum程序
rpm -qa | grep yum rpm -qa | grep yum|xargs rpm -e --nodeps rpm -qa | grep python-urlgrabber|xargs rpm -e --nodeps
2、安装yum
方案一：联网下载相关rpm包安装。
1、上传wget安装包到服务器，对其安装。
rpm -ivh wget-1.14-18.el7_6.1.x86_64.rpm
2、下载5个所需安装包（yum-metadata-parser、yum、yum-plugin-fastestmirror、yum-utils、python-urlgrabber）
wget https://mirrors.aliyun.com/centos/7/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm wget https://mirrors.aliyun.com/centos/7/os/x86_64/Packages/yum-3.4.3-168.el7.centos.noarch.rpm wget https://mirrors.aliyun.com/centos/7/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-54.el7_8.noarch.rpm wget https://mirrors.aliyun.com/centos/7/os/x86_64/Packages/yum-utils-1.1.31-54.el7_8.noarch.rpm wget https://mirrors.aliyun.com/centos/7/os/x86_64/Packages/python-urlgrabber-3.10-10.el7.noarch.rpm
3、安装python扩展和yum包（强制）
rpm -ivh python-urlgrabber-3.10-10.el7.noarch.rpm rpm -ivh yum*.rpm --force --nodeps
方案二：直接上传相关rpm包安装。
1、进入存放rpm包的目录。
2、安装python扩展和yum包（强制）
rpm -ivh python-urlgrabber-3.10-10.el7.noarch.rpm rpm -ivh yum*.rpm --force --nodeps
三、备份并新增yum源
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo curl -o /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo sed -i 's/$releasever/7/g' /etc/yum.repos.d/CentOS-Base.repo
四、生成缓存检查yum源
yum clean all yum makecache
五、安装软件进行测试
yum install vim net-tools lsof