MySQL 5.7 upgrade to 8.0 detailed process

一、升级前准备

1.1.MySQL提供mysql-shell验证方式,It can be downloaded and verified：

下载shell验证文件：
https://cdn.mysql.com/archives/mysql-shell/mysql-shell-8.0.27-linux-glibc2.12-x86-64bit.tar.gz

Verify that the upgrade can be successful（Several errors occurred during verification and were not handled,No issues were found after the upgrade,If it is a production environment, be careful）

# 验证mysql升级
[[email protected]] tar -xf mysql-shell-8.0.27-linux-glibc2.12-x86-64bit.tar.gz
[[email protected]] cd mysql-shell-8.0.27-linux-glibc2.12-x86-64bit/bin
[[email protected]] ./mysqlsh -uroot -p'123456' -S /tmp/mysql.sock -e "util.checkForServerUpgrade()"

1.2. 备份原数据库（Prevent problems during the upgrade process,导致数据丢失,Off-site backup is recommended under certain conditions）

[[email protected]] mysqldump -uroot -p'123456' --all-databases  --lock-tables=0 > all.sql.bak.20220412
[[email protected]] mv all.sql.bak.20220412 /data/backup/mysql/

1.3.下载MySQL8.0

下载地址：mysql:https://downloads.mysql.com/archives/community/
选择文件：mysql-8.0.27-linux-glibc2.12-x86_64.tar.xz

# 解压mysql8.0：
[[email protected]] tar -xf mysql-8.0.27-linux-glibc2.12-x86_64.tar.xz
# 移动到指定目录
[[email protected]] mv mysql-8.0.27-linux-glibc2.12-x86_64 /usr/local/mysql8
# 更改文件夹所属
[roo[email protected]] chown -R mysql.mysql /usr/local/mysql8/

二、Upgrade process configuration

2.1. 修改mysql配置文件,主要是mysql8.0部分,及sql_mode中的NO_ENGINE_SUBSTITUTION

# 编辑配置文件
[[email protected]] vim /etc/my.cnf

[client]
port=3306
socket=/tmp/mysql.sock

[mysqld]
log-bin=mysql-bin
server-id=170
character_set_server=utf8
init_connect='SET NAMES utf8'
#basedir=/usr/local/mysql
#datadir=/usr/local/mysql/data
socket=/tmp/mysql.sock
log-error=/var/log/mysqld.log
pid-file=/run/mysqld/mysqld.pid
#不区分大小写
lower_case_table_names =1

sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION

max_connections=5000

default-time_zone = '+8:00'
max_allowed_packet = 32M
#default_password_lifetime=90
#wait_timeout=600

# mysql8.0 add
collation-server=utf8_general_ci
basedir=/usr/local/mysql8
datadir=/usr/local/mysql/data
skip_ssl
default_authentication_plugin=mysql_native_password

2.2 开始升级

# 进入原mysql命令行
[[email protected]] mysql -uroot -p'123456'

# 查看mysql版本
mysql> select version();
+------------+
| version()  |
+------------+
| 5.7.26-log |
+------------+
1 row in set (0.00 sec)

mysql> show variables like 'innodb_fast_shutdown';
+----------------------+-------+
| Variable_name        | Value |
+----------------------+-------+
| innodb_fast_shutdown | 1     |
+----------------------+-------+
1 row in set (0.00 sec)

# 确保数据都刷到硬盘上,更改成0
mysql> set global innodb_fast_shutdown=0;
Query OK, 0 rows affected (0.00 sec)

mysql> shutdown;
Query OK, 0 rows affected (0.00 sec)

mysql> exit;
Bye

使用安全模式启动mysql8.0,正常启动后可以进入到mysql命令行,如果没启动成功,需要查看日志cat /var/log/mysqld.log解决后,再进入命令行

# 使用mysql8.0启动
[[email protected]] /usr/local/mysql8/bin/mysqld_safe --defaults-file=/etc/my.cnf --user=mysql &


# 进入mysql命令行
[[email protected]] mysql -uroot -p'123456'
mysql> select version();
+-----------+
| version() |
+-----------+
| 8.0.27    |
+-----------+
1 row in set (0.00 sec)

mysql> exit;
Bye

2.2 配置环境变量

[[email protected]] vim /etc/profile

# add mysql
export PATH=$PATH:/usr/local/mysql8/bin

# 使环境变量生效
[[email protected]] source /etc/profile

View the client version configuration

# 验证版本
[[email protected]] which mysql
/usr/local/mysql8/bin/mysql
# 查看版本
[[email protected]] mysql -V
mysql  Ver 8.0.27 for Linux on x86_64 (MySQL Community Server - GPL)

If the client version is incorrect,可以修改软链接,再重新查看

# 修改软链接
[[email protected]] ln -snf /usr/local/mysql8/bin/mysql /usr/bin/mysql

三、配置启动项

[[email protected]] cp /usr/local/mysql8/support-files/mysql.server /etc/init.d/mysqld
# 修改启动项目
[[email protected]] vim /etc/init.d/mysqld
# 修改目录位置
basedir=/usr/local/mysql8
datadir=/usr/local/mysql/data

# Add to startup list 
[[email protected]] chkconfig --add mysqld
# Refresh startup information
[[email protected]] systemctl daemon-reload
# 查看启动项列表
[[email protected]] chkconfig --list

Restarting the server was unsuccessful,There is no error when starting upmysqld.pid文件,Started successfully after creation

# Restart failed to createmysqld.pid文件处理方法
[[email protected]] cat /var/log/mysqld.log
[[email protected]] cd /run
[[email protected]] mkdir mysqld
[[email protected]] chown -R mysql.mysql ./mysqld
[[email protected]] cd mysqld
[[email protected]] touch mysqld.pid
[[email protected]] chown -R mysql.mysql ./mysqld.pid
[[email protected]] service mysqld start

Starting MySQL.. SUCCESS!

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