背景： ubuntu使用docker安装了MySQL8.0.14，根据官网教程创建了主从同步账号、设置主从同步后启动同步报错2061，错误日志
` [root@ldap1 modules]# mysql -uroot -p Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 72 Server version: 8.0.14 MySQL Community Server - GPL
Copyright (c) 2000, 2019, 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> show slave status \G *************************** 1. row *************************** Slave_IO_State: Connecting to master Master_Host: 192.168.1.3 Master_User: replication Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000002 Read_Master_Log_Pos: 734 Relay_Log_File: mysql-relay-bin.000002 Relay_Log_Pos: 4 Relay_Master_Log_File: mysql-bin.000002 Slave_IO_Running: Connecting Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 734 Relay_Log_Space: 155 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: NULL Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 2061 Last_IO_Error: error connecting to master '[email protected]:3306' - retry-time: 60 retries: 12 Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 0 Master_UUID: Master_Info_File: mysql.slave_master_info SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates Master_Retry_Count: 86400 Master_Bind: Last_IO_Error_Timestamp: 190129 14:09:22 Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: Executed_Gtid_Set: Auto_Position: 0 Replicate_Rewrite_DB: Channel_Name: Master_TLS_Version: Master_public_key_path: Get_master_public_key: 0 1 row in set (0.00 sec) mysql> `
问题排查：检查了主机和从机的网络、防火墙都没有问题，重新创建了同步账号再设置同步，问题仍然存在。再次查看官方文档，在网页的下方有很明确的提示：
MySQL8.0默认指定使用需要SSL的身份验证插件caching_sha2_password，而我们在创建同步复制账号时候没有指定REQUIRE SSL。为了降低这件事情的复杂性，我们选择了社区的解决方法，选择绕过SSL插件的验证，改为mysql_native_password验证来做同步复制。
解决： 重新创建MySQL复制账号，创建账号时指定身份验证方法
mysql> CREATE USER 'repl'@'192.168.1.3' IDENTIFIED WITH 'mysql_native_password' BY 'replicationPassword2019!'; mysql> GRANT REPLICATION SLAVE ON *.* TO 'repl'@'192.168.1.3'; mysql> FLUSH PRIVILEGES; 此时再查看该用户的密码加密方式，plugin为mysql_native_password
mysql> select user,host,plugin,authentication_string from user \G *************************** 1. row *************************** user: repl host: 192.168.1.3 plugin: mysql_native_password authentication_string: *47C25685DDCE2754F1175C38F437961FF6C5AC53
再次设置同步成功
` mysql> show slave status \G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 192.168.1.3 Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000003 Read_Master_Log_Pos: 1035 Relay_Log_File: mysql-relay-bin.000002 Relay_Log_Pos: 322 Relay_Master_Log_File: mysql-bin.000003 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 1035 Relay_Log_Space: 530 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: 0 Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 0 Last_IO_Error: Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 2 Master_UUID: 84db9645-2372-11e9-8d9a-000c29d69195 Master_Info_File: mysql.slave_master_info SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates Master_Retry_Count: 86400 Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: Executed_Gtid_Set: Auto_Position: 0 Replicate_Rewrite_DB: Channel_Name: Master_TLS_Version: Master_public_key_path: Get_master_public_key: 0 1 row in set (0.00 sec)
mysql> `