1. 验证网络管理器和网卡接口状态

   # systemctl status NetworkManager.service

   

   # nmcli dev status

   

2. 修改网卡配置文件

   通过上一步可以看到有两个网卡设备，eno16777984和lo，在/etc/sysconfig/network-scripts中查找以eno16777984结尾的文件，得到ifcfg-eno16777984文件。

   # vi ifcfg-eno16777984

   

   # :x

   保存退出

3. 启动网络，激活网卡

   # /etc/init.d/network start /启动网卡

   # ifup etho /激活网卡

   # nmcli device status /查看网络连接状态

Winscp，从本地Windows机器拷贝rpm到远程服务器，包括mysql和net-tools

# rpm –ivh net-tools.rpm

# rpm –ivh mysql.rpm

Mysql中的lib与mariadb中的lib冲突，而postfix依赖于mariadb中的mysql-client，卸载postfix与mariadb-libs

# rpm –e postfix.rpm

# rpm –e mariadb-libs.rpm

# rpm –ivh mysql.rpm mysql-client.rpm

# service mysql start

# mysql –u root –p (回车后输入密码，建议从.mysql_secret文件中拷贝，手打的容易出错)

Mysql> set password = password("123456")

Mysql> exit;

# mysql –u root –p (回车后输入新密码123456)

Mysql> grant all privileges on *.* to 'root'@'%' identified by '123456' with grant option;

Mysql> flush privileges;

# systemctl start firewalld.service /启动firewall

# systemctl stop firewalld.service /停止firewall

# systemctl disable firewalld.service /禁止firewall开机启动

# firewall-cmd --zone=public –add-port=3306/tcp –permanent /开启3306端口

# firewall-cmd –reload /重新载入以生效