Centos7更改yum源与更新系统

[1] 首先备份
/etc/yum.repos.d/CentOS-Base.repo
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

[2] 进入yum源配置文件所在文件夹
[root@localhost yum.repos.d]# cd /etc/yum.repos.d/

[3] 下载163的yum源配置文件，放入/etc/yum.repos.d/(操作前请做好相应备份)
[root@localhost yum.repos.d]# wget

（CentOS 5
wget -O /etc/yum.repos.d/CentOS-Base.repo

CentOS 6
wget -O /etc/yum.repos.d/CentOS-Base.repo

CentOS 7
wget -O /etc/yum.repos.d/CentOS-Base.repo ）


[4] 运行yum makecache生成缓存
[root@localhost yum.repos.d]# yum makecache
 

[5] 更新系统
[root@localhost yum.repos.d]# yum -y update
 
[6] 安装vim编辑器
[root@localhost ~]# yum -y install vim*
 

FAQ：
yum提示Another app is currently holding the yum lock; waiting for it to exit
可以通过强制关掉yum进程：

rm -f /var/run/yum.pid