Update CentOS7安装mysql5.7.md

修改MD语法

linux/CentOS7安装mysql5.7.md

@@ -5,19 +5,19 @@
 
 
 * 卸载系统默认mariadb
-```
+```shell
 rpm -qa | grep mariadb;
 rpm -e mariadb-libs-5.5.60-1.el7_5.x86_64 --nodeps
 ```
 
 * 上传并解压文件
-```
+```shell
 mkdir /usr/local/mysql/
 tar -vxf mysql-5.7.33-1.el7.x86_64.rpm-bundle.tar -C /usr/local/mysql/
 ```
 
 * 安装
-```
+```shell
 cd /usr/local/mysql/
 rpm -ivh mysql-community-common-5.7.33-1.el7.x86_64.rpm
 rpm -ivh mysql-community-libs-5.7.33-1.el7.x86_64.rpm
@@ -27,28 +27,28 @@ rpm -ivh mysql-community-server-5.7.33-1.el7.x86_64.rpm
 ```
 
 * 删除默认文件
-```
+```shell
 rm -rf /var/lib/mysql/*
 ```
 
 * 启动服务
-```
+```shell
 service mysqld start
 systemctl enable mysqld
 ```
 
 * 查看初始密码
-```
+```shell
 grep 'temporary password' /var/log/mysqld.log;
 ```
 
 * 登录
-```
+```shell
 mysql -u root -p aUuTak1Geg!k
 ```
 
 * 重新设置密码
-```
+```shell
 set password for 'root'@'localhost' = password('Root123@');
 #修改密码验证强度
 set global validate_password_policy=LOW;
@@ -60,4 +60,4 @@ grant all privileges on *.* to root@"%" identified by '123456' with grant option
 grant all privileges on *.* to root@localhost identified by '123456' with grant option;
 #刷新权限
 flush privileges;
-```
+```