mysql-5.7安裝部署+MySQL5.7初始密碼查看及重置
系統環境 Centos 7.6
首先下載mysql安裝包：
wget https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.27-1.el7.x86_64.rpm-bundle.tar
解壓：
tar -xvf mysql-5.7.27-1.el7.x86_64.rpm-bundle.tar
開始安裝：
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
啟動mysql
systemctl restart mysqld
mysql加入開機自動
systemctl enable mysqld
MySQL5.7初始密碼查看及重置
安裝了mysql5.7之后初始密碼不再默認為空
1.查看初始密碼：
[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
即初始密碼為 MtPqF0/oN5zo （密碼是隨機產生的，每台機器產生的都不一樣哦）
或者
另外一種方法查看默認密碼：
[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
這里的aJqZsA2m就是生成的root隨機密碼啦
2.登錄及修改密碼：
[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.
登錄之后 第一步必須先修改密碼，否則其他操作都執行不了。
修改密碼的方法：
mysql> alter user root@localhost identified by 'tyzZ001!';
Query OK, 0 rows affected (0.00 sec)
新修改的密碼中 必須包含 大小寫字母數字及符號