1.卸载流程：转载http://www.cnblogs.com/Lenbrother/articles/6203620.html
2.安装流程：转载http://www.centoscn.com/CentosServer/www/2016/0331/6964.html
转载http://www.cnblogs.com/julyme/p/5969626.html
一。配置防火墙开启端口
1.关闭fireewall systemctl stop firewalld.service
2.禁止fireewall启动 systemctl disable firewalld.service
3.安装iptables防火墙 yum install iptables-services
4.编辑iptables防火墙 vi /etc/sysconfig/iptables
# Firewall configuration written by system-config-firewall # Manual customization of this file is not recommended. *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT -A INPUT -p icmp -j ACCEPT -A INPUT -i lo -j ACCEPT -A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT -A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT -A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT -A INPUT -j REJECT --reject-with icmp-host-prohibited -A FORWARD -j REJECT --reject-with icmp-host-prohibited COMMIT :wq! #保存退出
5.重启防火墙使配置生效 systemctl restart iptables.service
6.设置开机启动 systemctl enable iptables.service
7.
# wget http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpm
# rpm -ivh mysql-community-release-el7-5.noarch.rpm
# yum install mysql-community-server
# service mysqld restart
# mysql -u root （初次登陆木有密码）
mysql> set password for 'root'@'localhost' =password('password');（设置密码）
mysql> grant all privileges on *.* to root@'%'identified by 'password';（远程连接设置）
mysql>create user 'username'@'%' identified by 'password'; （新建用户）
mysql -u root -p (登陆数据库)
8.关闭SELINUX(不清楚用途待查)
vi /etc/selinux/config
#SELINUX=enforcing #注释掉 #SELINUXTYPE=targeted #注释掉 SELINUX=disabled #增加 :wq! #保存退出 setenforce 0 #使配置立即生效二。卸载：
1.首先执行查看命令，看一下都安转了什么东东：
rpm -qa |grep -i mysql
2.执行卸载命令：yum remove （安装的东西）
3.检查是否卸载干净：rpm -qa |grep -i mysql
4.终极检查：rpm -qa |grep -i mysql
5.清理文件查看mysql文件目录：find / -name mysql.
6.删除掉该文件 ：rm -rf （文件路径）