mysql 5.7升级8.0

升级前准备：
[root@node01 ~]# mysql -V
mysql  Ver 14.14 Distrib 5.7.25, for linux-glibc2.12 (x86_64) using  EditLine wrapper

# 进入原5.7 mysql命令行 正确关闭数据库
mysql> select version();
+------------+
| version()  |
+------------+
| 5.7.25-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

升级步骤：
[root@node01 ~]# tar -xvf mysql-8.0.22-linux-glibc2.17-x86_64-minimal.tar.xz
[root@node01 ~]# ln -s /root/mysql-8.0.22-linux-glibc2.17-x86_64-minimal /usr/local/mysql8
[root@node01 ~]# ll /usr/local/mysql8
lrwxrwxrwx. 1 root root 49 Nov  4 00:13 /usr/local/mysql8 -> /root/mysql-8.0.22-linux-glibc2.17-x86_64-minimal
[root@node01 ~]# chown -R mysql.mysql /usr/local/mysql8*
[root@node01 ~]# vi /etc/profile
export MYSQL_HOME=/usr/local/mysql8
export PATH=$PATH:$MYSQL_HOME/bin

[root@node01 ~]# mysql -V
mysql  Ver 8.0.22 for Linux on x86_64 (MySQL Community Server - GPL)

参数文件：
[mysql]
port=3306
socket=/tmp/mysql.sock

[mysqld]
port=3306
socket=/tmp/mysql.sock
user=mysql
server-id=1
basedir=/usr/local/mysql8
datadir=/mysql/3306/data
log-bin=/mysql/3306/binlog/mysql-bin
binlog_format=row
gtid_mode = ON
enforce_gtid_consistency = ON

[root@node01 ~]# /usr/local/mysql8/bin/mysqld_safe &
[1] 9328
[root@node01 ~]# 2020-11-03T16:17:42.786011Z mysqld_safe Logging to '/mysql/3306/data/node01.err'.
2020-11-03T16:17:42.824011Z mysqld_safe Starting mysqld daemon with databases from /mysql/3306/data

[root@node01 ~]# mysql
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 11
Server version: 8.0.22 MySQL Community Server - GPL

Copyright (c) 2000, 2020, 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> select version();
+-----------+
| version() |
+-----------+
| 8.0.22    |
+-----------+
1 row in set (0.00 sec)

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
| test               |
+--------------------+
5 rows in set (0.00 sec)

mysql> use test;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> show tables;
+----------------+
| Tables_in_test |
+----------------+
| test           |
+----------------+
1 row in set (0.00 sec)

mysql> select * from test;
+------+
| id   |
+------+
|    1 |
|    2 |
|    3 |
+------+
3 rows in set (0.00 sec)

配置mysqld服务：
[root@node01 ~]# cp /usr/local/mysql8/support-files/mysql.server /etc/init.d/mysqld8