mysql8 常见错误

1. ERROR 2061 (HY000): Authentication plugin 'caching_sha2_password' reported error: Authentication requires secure connection. 【分析】mysql8默认使用插件caching_sha2_password,有些client连接报这个错误，需要拿到server的public key来加密password。【解决】加参数可以解决：--get-server-public-key mysql -u sha2user -p --get-server-public-key。做主从复制的时候也会碰到这种情况，加餐get_master_public_key=1; change master to     master_host='192.168.2.135',    master_port=3306,    master_user='repl_user',    master_password='123456',    master_auto_position=1 ,    get_master_public_key=1; 2.Multiple files found for the same tablespace ID: 2019-10-22T15:27:22.848885+08:00 1 [ERROR] [MY-012209] [InnoDB] Multiple files found for the same tablespace ID: 2019-10-22T15:27:22.848904+08:00 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 1 = ['sys/sys_config.ibd', 'sys/sys_config.ibd'] 2019-10-22T15:27:22.848915+08:00 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 15 = ['test/t.ibd', 'test/t.ibd'] 2019-10-22T15:27:22.848922+08:00 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 4294967278 = ['undo_002', 'undo_002'] 2019-10-22T15:27:22.848932+08:00 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 4294967279 = ['undo_001', 'undo_001'] 2019-10-22T15:27:22.848939+08:00 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 4294967294 = ['mysql.ibd', 'mysql.ibd'] 2019-10-22T15:27:22.848952+08:00 1 [ERROR] [MY-012930] [InnoDB] Plugin initialization aborted with error Failed, retry may succeed. 2019-10-22T15:27:22.849080+08:00 1 [ERROR] [MY-010334] [Server] Failed to initialize DD Storage Engine 2019-10-22T15:27:22.849297+08:00 0 [ERROR] [MY-010020] [Server] Data Dictionary initialization failed. 【解答】启动文件加参数innodb_directories="/data/mysqldata;"