配置网络

1.连接有线网络

2.修改网卡配置文件

vi /etc/sysconfig/network-scripts/ifcfg-enp2s0f1

TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=dhcp	# 选择dhcp
DEFROUTE=yes
NAME=enp2s0f1
DEVICE=enp2s0f1
ONBOOT=yes	# 改为yes

3.重启network

service network restart

更换yum源

1.备份默认源

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

2.下载阿里云源

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

3.更新镜像源

# 清除缓存
yum clean all
# 生成缓存
yum makecache

安装ssh

1.安装OpenSSH服务器

yum install -y openssh-server

2.启动ssh服务

systemctl start sshd

3.设置开机启动

systemctl enable sshd

4.配置防火墙

firewall-cmd --permanent --add-service=ssh
firewall-cmd --reload