mysql-5.7安装部署+MySQL5.7初始密码查看及重置
系统环境 Centos 7.6
首先下载mysql安装包：
wget https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.27-1.el7.x86_64.rpm-bundle.tar
解压：
tar -xvf mysql-5.7.27-1.el7.x86_64.rpm-bundle.tar
开始安装：
yum -y remove mariadb*
yum -y install mysql-community-common-5.7.27-1.el7.x86_64.rpm
yum -y install mysql-community-libs-5.7.27-1.el7.x86_64.rpm
yum -y install mysql-community-libs-compat-5.7.27-1.el7.x86_64.rpm
yum -y install mysql-community-devel-5.7.27-1.el7.x86_64.rpm
yum -y install mysql-community-client-5.7.27-1.el7.x86_64.rpm
yum -y install mysql-community-server-5.7.27-1.el7.x86_64.rpm
yum -y install mysql-community-libs-compat-5.7.27-1.el7.x86_64.rpm
启动mysql
systemctl restart mysqld
mysql加入开机自动
systemctl enable mysqld
MySQL5.7初始密码查看及重置
安装了mysql5.7之后初始密码不再默认为空
1.查看初始密码：
[root@VM_225_102_centos ~]# grep 'temporary password' /var/log/mysqld.log
2016-07-08T02:25:46.311098Z 1 [Note] A temporary password is generated for root@localhost: MtPqF0/oN5zo
即初始密码为 MtPqF0/oN5zo （密码是随机产生的，每台机器产生的都不一样哦）
或者
另外一种方法查看默认密码：
[root@localhost src]# cat /root/.mysql_secret
# The random password set for the root userat Fri Jan 10 20:00:34 2014 (local time): aJqZsA2m
这里的aJqZsA2m就是生成的root随机密码啦
2.登录及修改密码：
[root@VM_225_102_centos ~]# mysql -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.7.11
Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> show databases;
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
登录之后 第一步必须先修改密码，否则其他操作都执行不了。
修改密码的方法：
mysql> alter user root@localhost identified by 'tyzZ001!';
Query OK, 0 rows affected (0.00 sec)
新修改的密码中 必须包含 大小写字母数字及符号