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注：本文在测试环境升级测试，建议先在测试环境验证。在生产环境下还是先评估下，mysql-5.7.42为二进制方式安装，所以用mysql-8.2.0二进制包升级
1、操作环境
1、查看当前数据库版本
mysql> select@@version;
+-----------+
| @@version |
+-----------+
| 5.7.42 |
+-----------+
1 row in set (0.00 sec)
mysql>
2、操作系统版本
[root@zyl-server ~]# cat /etc/redhat-release
CentOS Linux release 7.9.2009 (Core)
[root@zyl-server ~]#
[root@zyl-server ~]#
3、查看 Linux 系统上的 glibc（GNU C 库）版本（这里很重要，要下载对应的内核mysql版本）
ldd --version
或者
rpm -q glibc
**查看当前系统中的libstdc++版本：**
strings /usr/lib64/libstdc++.so.6 | grep GLIBCXX
strings /usr/lib64/libstdc++.so.6 | grep CXXABI
strings /usr/lib64/libstdc++.so.6 | grep GLIBC
strings /usr/lib64/libstdc++.so.6 | grep GLIBCXX
否则后面升级完成后，启动mysql会报错：
报错如下：
错误表明在启动MySQL服务时出现了一些问题。主要的错误信息是关于缺少特定库文件的版本，比如GLIBCXX_3.4.20、CXXABI_1.3.9、CXXABI_1.3.8、GLIBCXX_3.4.21以及GLIBC_2.25。
这是由于安装的MySQL版本与系统中可用的标准库版本不兼容导致的（所以要对应下载相应的内核版本）。
Mar 20 21:10:55 db-mysql mysqld[7127]: /usr/local/mysql/bin/my_print_defaults: /lib64/libstdc++.so.6: version `CXXABI_1.3.9' not found (required by /usr/local/mysql/bin/my_print_defaults)
Mar 20 21:10:55 db-mysql mysqld[7127]: /usr/local/mysql/bin/my_print_defaults: /lib64/libstdc++.so.6: version `CXXABI_1.3.8' not found (required by /usr/local/mysql/bin/my_print_defaults)
Mar 20 21:10:55 db-mysql mysqld[7127]: /usr/local/mysql/bin/my_print_defaults: /lib64/libstdc++.so.6: version `GLIBCXX_3.4.21' not found (required by /usr/local/mysql/bin/my_print_defaults)
Mar 20 21:10:55 db-mysql mysqld[7127]: /usr/local/mysql/bin/my_print_defaults: /lib64/libc.so.6: version `GLIBC_2.25' not found (required by /usr/local/mysql/bin/../lib/private/libcrypto.so.3
Mar 20 21:10:55 db-mysql mysqld[7127]: /usr/local/mysql/bin/my_print_defaults: /lib64/libstdc++.so.6: version `GLIBCXX_3.4.20' not found (required by /usr/local/mysql/bin/my_print_defaults)
Mar 20 21:10:55 db-mysql mysqld[7127]: /usr/local/mysql/bin/my_print_defaults: /lib64/libstdc++.so.6: version `CXXABI_1.3.9' not found (required by /usr/local/mysql/bin/my_print_defaults)
Mar 20 21:10:55 db-mysql mysqld[7127]: /usr/local/mysql/bin/my_print_defaults: /lib64/libstdc++.so.6: version `CXXABI_1.3.8' not found (required by /usr/local/mysql/bin/my_print_defaults)
Mar 20 21:10:55 db-mysql mysqld[7127]: /usr/local/mysql/bin/my_print_defaults: /lib64/libstdc++.so.6: version `GLIBCXX_3.4.21' not found (required by /usr/local/mysql/bin/my_print_defaults)
Mar 20 21:10:55 db-mysql mysqld[7127]: /usr/local/mysql/bin/my_print_defaults: /lib64/libc.so.6: version `GLIBC_2.25' not found (required by /usr/local/mysql/bin/../lib/private/libcrypto.so.3
2、升级准备
1、数据备份：在升级之前，务必对当前的 MySQL 5.7 数据库进行完整备份，以防止数据丢失或损坏。确保备份文件的安全存储，并测试其可恢复性。
2、安全性考虑：建议在测试环境中进行升级测试，以模拟真实场景并检测潜在问题。这有助于减少生产环境中的不确定性和风险。
1、使用mysql-shell 检查工具检查兼容性
下载地址：https://downloads.mysql.com/archives/shell/
上传mysql-shell：
安装 mysql-shell rpm 软件包：：
rpm -Uvh mysql-shell-8.2.0-1.el7.x86_64.rpm --force --nodeps
查看 mysql-shel安装版本：
mysqlsh --version
检查该版本是否可以升级到MySQL 8.2.0：
mysqlsh -uroot -p -S /tmp/mysqld.sock -e "util.checkForServerUpgrade()"
注意:mysql.sock 地址在/etc/my.cnf 文件中查看。
检查结果报告：
[root@db-mysql ~]# mysqlsh -uroot -p -S /tmp/mysqld.sock -e "util.checkForServerUpgrade()"
Please provide the password for 'root@/tmp%2Fmysqld.sock': ******
Save password for 'root@/tmp%2Fmysqld.sock'? [Y]es/[N]o/Ne[v]er (default No):
The MySQL server at /tmp%2Fmysqld.sock, version 5.7.42 - MySQL Community Server
(GPL), will now be checked for compatibility issues for upgrade to MySQL
8.2.0...
1) Usage of old temporal type
No issues found
2) MySQL 8.0 syntax check for routine-like objects
No issues found
3) Usage of db objects with names conflicting with new reserved keywords
No issues found
4) Usage of utf8mb3 charset
Warning: The following objects use the utf8mb3 character set. It is
recommended to convert them to use utf8mb4 instead, for improved Unicode
support.
More information:
https://dev.mysql.com/doc/refman/8.0/en/charset-unicode-utf8mb3.html
db_update - schema's default character set: utf8
db_update.users.name - column's default character set: utf8
db_update.users.email - column's default character set: utf8
5) Table names in the mysql schema conflicting with new tables in 8.0
No issues found
6) Partitioned tables using engines with non native partitioning
No issues found
7) Foreign key constraint names longer than 64 characters
No issues found
8) Usage of obsolete MAXDB sql_mode flag
No issues found
9) 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
10) ENUM/SET column definitions containing elements longer than 255 characters
No issues found
11) Usage of partitioned tables in shared tablespaces
No issues found
12) Circular directory references in tablespace data file paths
No issues found
13) Usage of removed functions
No issues found
14) Usage of removed GROUP BY ASC/DESC syntax
No issues found
15) 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
16) 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
17) 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/
18) Zero Date, Datetime, and Timestamp values
No issues found
19) Schema inconsistencies resulting from file removal or corruption
No issues found
20) Tables recognized by InnoDB that belong to a different engine
No issues found
21) Issues reported by 'check table x for upgrade' command
No issues found
22) 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
23) Columns which cannot have default values
No issues found
24) Check for invalid table names and schema names used in 5.7
No issues found
25) Check for orphaned routines in 5.7
No issues found
26) Check for deprecated usage of single dollar signs in object names
No issues found
27) Check for indexes that are too large to work on higher versions of MySQL
Server than 5.7
No issues found
28) Check for deprecated '.<table>' syntax used in routines.
No issues found
29) Check for columns that have foreign keys pointing to tables from a diffrent
database engine.
No issues found
Errors: 0
Warnings: 4
Notices: 1
NOTE: 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.
检查结果显示：
没有发现使用旧时态类型的问题
没有发现与MySQL 8.0语法相关的问题
没有发现与数据库对象名称与新保留关键字冲突的问题
发现某些对象使用了utf8mb3字符集，建议转换为utf8mb4以获得更好的Unicode支持
没有发现与mysql模式中的表名冲突的问题
没有发现使用具有非本地分区的引擎的分区表的问题
没有发现外键约束名称超过64个字符的问题
没有发现使用已弃用的MAXDB sql_mode标志的问题
发现一些DB对象已经使用了过时的sql_mode选项
没有发现ENUM/SET列定义中包含超过255个字符的元素的问题
没有发现在共享表空间中使用分区表的问题
没有发现表空间数据文件路径中存在循环目录引用的问题
没有发现使用已删除函数的问题
没有发现已删除的GROUP BY ASC/DESC语法的问题
无法运行需要指定完整MySQL服务器配置文件路径的日志系统变量检查
无法运行需要指定完整MySQL服务器配置文件路径的已删除系统变量检查
无法运行需要指定完整MySQL服务器配置文件路径的新默认值系统变量检查
没有发现零日期、日期时间和时间戳值的问题
没有发现由文件删除或损坏导致的模式不一致的问题
没有发现被InnoDB识别为属于不同引擎的表的问题
没有发现通过'check table x for upgrade'命令报告的问题
发现新的默认身份验证插件引入了兼容性问题，建议在升级后重新配置服务器以恢复到以前的默认身份验证插件
没有发现不能有默认值的列的问题
没有发现在5.7中使用的无效表名和模式名的问题
没有发现在5.7中遗留存储过程的问题
没有发现在对象名称中使用单个美元符号的已弃用用法
没有发现在高于MySQL Server 5.7版本上工作的索引过大的问题
没有发现在例程中使用已弃用'.<table>'语法的问题
没有发现具有外键指向不同数据库引擎的表的列的问题
总结：
错误：0
警告：4
注意事项：1
总结来说，检查未发现会阻止升级的致命错误，但检测到了一些潜在问题。在升级之前，请确保报告的问题并不重要。
3、mysqldump 导出数据文件和备份my.cnf
[root@db-mysql ~]# mysqldump -hlocalhost -uroot -p --all-databases > /home/db_back_2024.sql
Enter password:
[root@db-mysql ~]# cd /home/
[root@db-mysql home]# ll
total 872
-rw-r--r-- 1 root root 889253 Mar 20 20:25 db_back_2024.sql
drwx------ 2 oracle oinstall 127 Mar 18 05:12 oracle
drwx------. 2 zyl zyl 62 Mar 16 22:24 zyl
[root@db-mysql home]# cp /etc/my.cnf /home/5.7.37_my.cnf
[root@zyl-mysql home]#
升级前先停止数据库。
[root@db-mysql home]# systemctl stop mysqld
4、备份旧版mysql-5.7.42 安装目录下的文件和my.cnf文件（重要）
这里的安装目录在/usr/local/mysql，根据自己实际备份。
cd /usr/local/
mkdir mysql-5.7.42_bk
##全部备份 mysql目录下的文件
cp -R mysql/* mysql-5.7.42_bk
### 或者直接压缩
### tar -zcvf mysql-5.7.42_bk.tar.gz mysql
[root@db-mysql bin]# tar zcf mysql-5.7.42_bk.tar.gz mysql
5、删除旧版安装目录/usr/local/mysql下(bin、docs、includ、lib、share、support-files、LICENSE、README)；
cd /usr/local/mysql
rm -rf bin
rm -rf docs
rm -rf include
rm -rf lib
rm -rf README
rm -rf LICENSE
rm -rf share
rm -rf support-files
rm -rf man
6、备份mysqld 启动文件
先备份/etc/init.d/ 下的mysqld 再 删除/etc/init.d/ 下的mysqld
cd /etc/init.d/
tar zcf mysqld_5.7.42.tar.gz mysqld
rm -rf /etc/init.d/mysqld
7、上传、解压安装包（开始升级）
下载mysql8.2.0:
https://downloads.mysql.com/archives/community/
创建"mysql8.2.0-glibc"的文件夹，用于存放解压文件。
mkdir /root/mysql8.2.0-glibc
##解压
tar -xvf mysql-8.2.0-linux-glibc2.28-x86_64.tar -C /root/mysql8.2.0-glibc
##继续解压
cd /root/mysql8.2.0-glibc
tar -xvf mysql-8.2.0-linux-glibc2.28-x86_64.tar.xz
将新解压的mysql-8.2.0目录复制到原来mysql安装目录下（/usr/local/mysql/），并修改文件权限。
[root@db-mysql mysql8.2.0-glibc]# mv mysql-8.2.0-linux-glibc2.17-x86_64/* /usr/local/mysql
##修改文件权限
chown -R mysql:mysql /usr/local/mysql
8、复制新版启动文件到/etc/init.d/
将新解压的mysql-8.2.0 的mysqld复制到/etc/init.d/ 下。
cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysqld
9、修改mysqld参数
vi /etc/init.d/mysqld
和旧版保持一致。
datadir=/usr/local/mysql/data
basedir=/usr/local/mysql
10、启动数据库
[root@db-mysql ~]# systemctl daemon-reload
[root@db-mysql ~]#
[root@db-mysql ~]# systemctl start mysqld
[root@db-mysql ~]#
[root@db-mysql ~]# systemctl status mysqld
11、升级验证
1、检查登录正常
mysql -u root -p
[root@db-mysql mysql]# mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 10
Server version: 8.2.0 MySQL Community Server - GPL
Copyright (c) 2000, 2023, Oracle and/or its affiliates.
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>
2、检查升级版本
已由mysql-5.7.42 升级到 mysql-8.2.0 。
mysql> select@@version;
+-----------+
| @@version |
+-----------+
| 8.2.0 |
+-----------+
1 row in set (0.00 sec)
mysql>
3、检查数据
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| db_update |
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
5 rows in set (0.01 sec)
mysql> use db_update;
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_db_update |
+---------------------+
| users |
+---------------------+
1 row in set (0.00 sec)
mysql> select * from users;
+----+---------+------+---------------------+
| id | name | age | email |
+----+---------+------+---------------------+
| 1 | Alice | 25 | alice@example.com |
| 2 | Bob | 30 | bob@example.com |
| 3 | Charlie | 22 | charlie@example.com |
| 4 | David | 28 | david@example.com |
| 5 | Eve | 35 | eve@example.com |
+----+---------+------+---------------------+
5 rows in set (0.00 sec)
mysql>
❤️🔥 写在最后：一定要下载与Linux 系统上的 glibc（GNU C 库）版本对应的mysql版本）文章来源：https://www.toymoban.com/news/detail-842547.html
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