Centos7 安装MySQL5.6.25数据库（断网安装）
一、安装环境及相关信息
服务器系统：Centos7（CentOS-7-x86_64-DVD-1908.iso）
安装软件：mysql5.6.46（MySQL-5.6.25-1.linux_glibc2.5.x86_64.rpm-bundle.tar）
二、安装步骤
1、挂载ISO文件配置本地源
a)根目录下新建文件夹 /mysql/soft后Xftp上传镜像iso至 /mysql/soft
b) mount -o loop -t iso9660 /mysql/soft/CentOS-7-x86_64-DVD-1908.iso /media/
c)编辑yum源的本地文件配置# vi /etc/yum.conf
[EL]
name =Linux 7 DVD
baseurl=file:///media/
gpgcheck=0
enabled=1
d) cd /etc/yum.repos.d/
# mv CentOS-Base.repo CentOS-Base.repo-bak
清空yum缓存 # yum clean all
测试yum源 # yum install gcc –y
2、卸载MariaDB（CentOS7 默认自带）
rpm -qa | grep -i mariadb
mariadb-libs-5.5.52-1.el7.x86_64
rpm -e --nodeps mariadb-libs-5.5.52-1.el7.x86_64 //强制删除MariaDB
3、安装依赖包
yum install m4 autoconf libaio
4、安装MySQL
a)把mysql包发送到 /usr/local/
b)解压
tar –xvf MySQL-5.6.25-1.linux_glibc2.5.x86_64.rpm-bundle.tar
c)安装
rpm -ivh MySQL-client-5.6.25-1.linux_glibc2.5.x86_64.rpm
rpm -ivh MySQL-devel-5.6.25-1.linux_glibc2.5.x86_64.rpm
rpm -ivh MySQL-server-5.6.25-1.linux_glibc2.5.x86_64.rpm
d)启动并配置mysql
systemctl start mysql //centos7.x启动mysql
/sbin/chkconfig mysql on //添加开机启动
cat /root/.mysql_secret //查看默认mysql密码
lJo6r_aA7VwqIzic
mysql -uroot -p’ lJo6r_aA7VwqIzic ’ //登录mysql
mysql> SET PASSWORD FOR ‘root’@‘localhost’ = PASSWORD(‘video’); //修改为简单密码
mysql> //开启远程登录
set password for ‘root’@‘localhost’ =password(‘video’);
grant all privileges on . to ‘root’ @ ‘%’ identified by ‘video’ with grant option;
flush privileges; 
最后，验证登陆
mysql -uroot –pvideo
