MySQL5.6升级到5.7步骤

mysql5.6 升级至 mysql5.7

环境介绍：
旧库：
basedir=/usr/local/mysql-5.6
datadir=/home/mysql 
config=/home/mysql/my.cnf
sock=/home/mysql/mysql.sock 
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
character_set_server = utf8
lower_case_table_names=1
skip-host-cache
skip-name-resolve
federated
log-error=/home/mysql/log/mysqld.log
pid-file=/home/mysql/master.example.com.pid

[mysql]
default-character-set = utf8
socket=/home/mysql/mysql.sock

升级步骤：

1、对mysql5.6进行全库备份（******）用于失败倒回
2、关闭mysql5.6版本数据库
3、将mysql5.7软件部署
4、修改配置信息
5、修改启动脚本
6、启动mysql5.7数据库
7、mysql_upgrade升级数据库相关参数
8、重启数据库，测试升级结果

1、全库备份
mysqldump -uroot -p123456 --all-databases > /root/mysql_all.sql

2、 关闭数据库

/usr/local/mysql-5.6/bin/mysqladmin -uroot -p123456 shutdown

验证
netstat -tnpl|grep :3306

3、 部署mysql5.7
tar xf mysql-5.7.22-el7-x86_64.tar.gz -C /usr/local

cd /usr/local 
mv mysql-5.7.22 mysql5.7

4、修改配置信息

vim /home/mysql/my.cnf 
basedir=/usr/local/mysql5.7            ---修改 

5、修改启动脚本
cp /usr/local/mysql5.7/support-files/mysql.server /etc/init.d/mysql5.7

vim /etc/init.d/mysql5.7
basedir=/usr/local/mysql5.7
datadir=/home/mysql

6、启动mysql5.7
service mysql5.7 start

[root@master ~]# netstat -tnpl |grep :3306
tcp6       0      0 :::3306                 :::*                    LISTEN      8820/mysqld 

[root@master mysql]# mysql -uroot -p123456
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.22 MySQL Community Server (GPL)

Copyright (c) 2000, 2018, 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.
7、yum源安装的mysql启动路径是/usr/bin/mysql

首先 unlink /usr/bin/mysql,再ln -s /usr/local/mysql5.7 /usr/bin/mysql

8、出现Warning: MySQL Connection Failed: Can't connect to local MySQL server through socket '/tmp/mysql.sock' (111) in /home/httpd/html/show.php on line 9 

將 /tmp/mysql.sock link 到 /var/lib/mysql 目錄裡即可： 

linux# ln -s /var/lib/mysql/mysql.sock /tmp/mysql.sock 

9、升级库

* 利用MySQL 5.7包中的mysql_upgrade 升级MySQL数据中的系统表　-p指定密码

10、查看mysql版本的2种方式：

1、mysql -V

2、