mysql升级到最新版（mysql8.0.25）

8.0.18 升级到 8.0.25检查：
MySQL  10.1.1.13:3306 ssl  JS > util.checkForServerUpgrade()
The MySQL server at 10.1.1.13:3306, version 8.0.18 - MySQL Community Server -
GPL, will now be checked for compatibility issues for upgrade to MySQL 8.0.25...
1) Issues reported by 'check table x for upgrade' command
  No issues found

Errors:   0
Warnings: 0
Notices:  0

5.7.26 升级到8.0.25 检查：
MySQL  10.1.1.14:3308  JS > util.checkForServerUpgrade()
The MySQL server at 10.1.1.14:3308, version 5.7.26-log - MySQL Community Server
(GPL), will now be checked for compatibility issues for upgrade to MySQL
8.0.25...

1) Usage of old temporal type
  No issues found

2) Usage of db objects with names conflicting with new reserved keywords
  No issues found

3) Usage of utf8mb3 charset
  No issues found

4) Table names in the mysql schema conflicting with new tables in 8.0
  No issues found

5) Partitioned tables using engines with non native partitioning
  No issues found

6) Foreign key constraint names longer than 64 characters
  No issues found

7) Usage of obsolete MAXDB sql_mode flag
  No issues found

8) Usage of obsolete sql_mode flags
  Notice: The following DB objects have obsolete options persisted for
    sql_mode, which will be cleared during upgrade to 8.0.
  More information:
    https://dev.mysql.com/doc/refman/8.0/en/mysql-nutshell.html#mysql-nutshell-removals

  global system variable sql_mode - defined using obsolete NO_AUTO_CREATE_USER
    option

9) ENUM/SET column definitions containing elements longer than 255 characters
  No issues found

10) Usage of partitioned tables in shared tablespaces
  No issues found

11) Circular directory references in tablespace data file paths
  No issues found

12) Usage of removed functions
  No issues found

13) Usage of removed GROUP BY ASC/DESC syntax
  No issues found

14) Removed system variables for error logging to the system log configuration
  To run this check requires full path to MySQL server configuration file to be specified at 'configPath' key of options dictionary
  More information:
    https://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-13.html#mysqld-8-0-13-logging

15) Removed system variables
  To run this check requires full path to MySQL server configuration file to be specified at 'configPath' key of options dictionary
  More information:
    https://dev.mysql.com/doc/refman/8.0/en/added-deprecated-removed.html#optvars-removed

16) System variables with new default values
  To run this check requires full path to MySQL server configuration file to be specified at 'configPath' key of options dictionary
  More information:
    https://mysqlserverteam.com/new-defaults-in-mysql-8-0/

17) Zero Date, Datetime, and Timestamp values
  No issues found

18) Schema inconsistencies resulting from file removal or corruption
  No issues found

19) Tables recognized by InnoDB that belong to a different engine
  No issues found

20) Issues reported by 'check table x for upgrade' command
  No issues found

21) New default authentication plugin considerations
  Warning: The new default authentication plugin 'caching_sha2_password' offers
    more secure password hashing than previously used 'mysql_native_password'
    (and consequent improved client connection authentication). However, it also
    has compatibility implications that may affect existing MySQL installations. 
    If your MySQL installation must serve pre-8.0 clients and you encounter
    compatibility issues after upgrading, the simplest way to address those
    issues is to reconfigure the server to revert to the previous default
    authentication plugin (mysql_native_password). For example, use these lines
    in the server option file:
    
    [mysqld]
    default_authentication_plugin=mysql_native_password
    
    However, the setting should be viewed as temporary, not as a long term or
    permanent solution, because it causes new accounts created with the setting
    in effect to forego the improved authentication security.
    If you are using replication please take time to understand how the
    authentication plugin changes may impact you.
  More information:
    https://dev.mysql.com/doc/refman/8.0/en/upgrading-from-previous-series.html#upgrade-caching-sha2-password-compatibility-issues
    https://dev.mysql.com/doc/refman/8.0/en/upgrading-from-previous-series.html#upgrade-caching-sha2-password-replication

Errors:   0
Warnings: 1
Notices:  1

No fatal errors were found that would prevent an upgrade, but some potential issues were detected. Please ensure that the reported issues are not significant before upgrading.
 MySQL  10.1.1.14:3308  JS > 

cd /usr/local
wget https://dev.mysql.com/get/Downloads/MySQL-8.0/mysql-8.0.25-linux-glibc2.12-x86_64.tar.xz
解压：
tar -Jxvf mysql-8.0.25-linux-glibc2.12-x86_64.tar.xz
chown 权限
chown mysql:mysql -R /usr/local/mysql-8.0.25-linux-glibc2.12-x86_64

mysql> stop slave;
mysql> shutdown

cd /usr/local
rm -rf mysql
ln -s /usr/local/mysql-8.0.25-linux-glibc2.12-x86_64 mysql

/usr/local/mysql8018/bin/mysqld --defaults-file=/home/my3306.cnf --user=mysql &

2021-06-28T04:28:21.864893-04:00 1 [Note] [MY-012976] [InnoDB] 8.0.25 started; log sequence number 20126176
2021-06-28T04:28:21.876704-04:00 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended.
2021-06-28T04:28:21.901950-04:00 1 [System] [MY-011090] [Server] Data dictionary upgrading from version '80017' to '80023'.
2021-06-28T04:28:21.924913-04:00 1 [Note] [MY-013327] [Server] MySQL server upgrading from version '80018' to '80025'.
2021-06-28T04:28:22.112061-04:00 1 [Note] [MY-012357] [InnoDB] Reading DD tablespace files
2021-06-28T04:28:22.113231-04:00 1 [Note] [MY-012356] [InnoDB] Scanned 6 tablespaces. Validated 6.
2021-06-28T04:28:22.738032-04:00 1 [System] [MY-013413] [Server] Data dictionary upgrade from version '80017' to '80023' completed.
2021-06-28T04:28:22.752008-04:00 1 [Note] [MY-013327] [Server] MySQL server upgrading from version '80018' to '80025'.
2021-06-28T04:28:22.907422-04:00 1 [Note] [MY-010006] [Server] Using data dictionary with version '80023'.
2021-06-28T04:28:22.917070-04:00 0 [Note] [MY-011332] [Server] Plugin mysqlx reported: 'IPv6 is available'
2021-06-28T04:28:22.917732-04:00 0 [Note] [MY-011323] [Server] Plugin mysqlx reported: 'X Plugin ready for connections. bind-address: '::' port: 33060'
2021-06-28T04:28:22.917943-04:00 0 [Note] [MY-011323] [Server] Plugin mysqlx reported: 'X Plugin ready for connections. socket: '/tmp/mysqlx.sock''
2021-06-28T04:28:22.918153-04:00 0 [System] [MY-011323] [Server] X Plugin ready for connections. Bind-address: '::' port: 33060, socket: /tmp/mysqlx.sock
2021-06-28T04:28:24.728769-04:00 4 [System] [MY-013381] [Server] Server upgrade from '80018' to '80025' started.
2021-06-28T04:28:24.730175-04:00 4 [Note] [MY-013386] [Server] Running queries to upgrade MySQL server.

select version();
mysql> select version();
+-----------+
| version() |
+-----------+
| 8.0.25    |
+-----------+