Centos6系统yum源（2022-09-15亲测可用）
1、备份
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
2、更换centos6yum源（centos6官方源已下线，建议切换centos-vault源）
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-6.10.repo
3、yum clean all && yum makecache
yum clean all && yum makecache
chkconfig sshd on
or
chkconfig –level 2345 sshd on
vim /etc/inittab
id:5:initdefault:
to:
id:3:initdefault: