centos7初始安装后配置dns与更新源与关闭防火墙

CentOS7 更新源

1、备份

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

2、下载新的CentOS-Base.repo 到/etc/yum.repos.d/

CentOS 6

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
或者

curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
CentOS 7

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
或者

curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

3、之后运行yum makecache生成缓存

Centos7 添加dns

nmcli connection show 查看当前启动的连接eth0，根据自己实际情况

nmcli con mod eth0 ipv4.dns 114.114.114.114 更改dns

nmcli con up eth0 配置生效

Centos7关闭防火墙

查看防火墙状态

firewall-cmd --state

关闭防火墙

systemctl stop firewalld.service

禁止防火墙开机自启

systemctl disable firewalld.service