从库
一、新版本mysql环境准备
1.解压mysql 5.7.31
tar -zxf mysql-5.7.31-linux-glibc2.12-x86_64.tar.gz -C /software/
2. 替换软链接
[root@study04 software]# ll
total 0
drwxr-xr-x 3 mysql mysql 209 Apr 12 14:14 3307
drwxr-xr-x 3 mysql mysql 209 Apr 12 14:22 3308
lrwxrwxrwx 1 mysql mysql 35 Apr 12 11:36 mysql -> mysql-5.7.25-linux-glibc2.12-x86_64
drwxr-xr-x 9 mysql mysql 129 Apr 12 11:30 mysql-5.7.25-linux-glibc2.12-x86_64
drwxr-xr-x 9 7161 31415 129 Jun 2 2020 mysql-5.7.31-linux-glibc2.12-x86_64
[root@study04 software]# unlink mysql
[root@study04 software]# ln -s mysql-5.7.31-linux-glibc2.12-x86_64 mysql
[root@study04 software]# ll
total 0
drwxr-xr-x 3 mysql mysql 209 Apr 12 14:14 3307
drwxr-xr-x 3 mysql mysql 209 Apr 12 14:22 3308
lrwxrwxrwx 1 root root 35 Apr 12 14:28 mysql -> mysql-5.7.31-linux-glibc2.12-x86_64
drwxr-xr-x 9 mysql mysql 129 Apr 12 11:30 mysql-5.7.25-linux-glibc2.12-x86_64
drwxr-xr-x 9 7161 31415 129 Jun 2 2020 mysql-5.7.31-linux-glibc2.12-x86_64
3.修改目录权限
chown -R mysql.mysql mysql-5.7.31-linux-glibc2.12-x86_64
二、停从库流量和实例并备份数据
1.检查表是否损坏
mysql> select * from information_schema.tables where TABLE_COMMENT like '%repair%';
Empty set (0.10 sec)
2.检查从库主从是否正常及有无延迟
show slave status \G
3.停从库流量及io_thread
mysql> stop slave io_thread;
Query OK, 0 rows affected (0.00 sec)
4.数据全部落盘
待slave sql_thread完全应用后全部落盘
mysql> set global innodb_fast_shutdown=0;
Query OK, 0 rows affected (0.00 sec)
5.停从库
mysql> shutdown;
Query OK, 0 rows affected (0.00 sec)
4.备份从库
通过 cp datadir 目录的方式来备份
cp -a data data0412
三、启动新版本MySQL
1.检查my.cnf配置文件
- 1.1 检查basedir指向位置是否正确
- 1.2 super_read_only 如果开启的话需要临时关闭，后期升级数据字典时候需要写入数据
2.检查启动脚本basedir指向是否正确
[root@study04 3308]# cat /etc/systemd/system/mysqld_3308.service | grep ExecStart
ExecStart=/software/mysql/bin/mysqld --defaults-file=/software/3308/my.cnf
3.启动msyql5.7.31
[root@study04 3308]# systemctl start mysqld_3308
[root@study04 3308]# ps -ef | grep mysqld | grep 3308
mysql 6703 1 10 14:58 ? 00:00:01 /software/mysql/bin/mysqld --defaults-file=/software/3308/my.cnf
四、运行 mysql_upgrade 升级数据字典
1.运行 mysql_upgrade
- 1.出现Upgrade process completed successfully字样表示成功
- 2.如果中间出现错误打断，需要再次运行
[root@study04 3308]# mysql_upgrade -uroot -S /software/3308/mysql.sock
Checking if update is needed.
Checking server version.
Running queries to upgrade MySQL server.
Checking system database.
mysql.columns_priv OK
mysql.db OK
mysql.engine_cost OK
...
...
...
sbtest.sbtest3 OK
sbtest.sbtest4 OK
sys.sys_config OK
Upgrade process completed successfully.
Checking if update is needed.
2.重启MySQL 5.7.31实例
[root@study04 3308]# systemctl restart mysqld_3308
五、升级后操作
1.确认升级是否成功
mysql> select version();
+------------+
| version() |
+------------+
| 5.7.31-log |
+------------+
1 row in set (0.00 sec)
2.检查主从状态及延迟情况
mysql> show slave status \G
主库
- 1.停主库流量
- 2.待主从数据一致后进行主从切换
- 3.讲流量指向升级后新主库
- 4.原主库重复上述步骤升级
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