关于mysql8.0无法连接的问题

关于升级mysql8.0无法连接的问题

最近朋友遇到canal无法连接数据库的问题
报错代码：

ERROR c.a.otter.canal.parse.inbound.mysql.MysqlEventParser - dump address /127.0.0.1:3306 has an error, retrying. caused by
com.alibaba.otter.canal.parse.exception.CanalParseException:

这个是nodejs无法连接的错误
代码：

var mysql = require('mysql');
var connection = mysql.createConnection({
  host: 'localhost',
  user: 'root',
  password: '',
  database: 'test_db',
  // insecureAuth : true,
});

connection.query('SELECT * FROM users', function(err, rows, fields) {
  if (err) throw err;
});

报错

C:\Users\mysql-test>node app.js
    C:\Users\mysql-test\node_modules\mysql\lib\protocol\Parse
    r.js:80
            throw err; // Rethrow non-MySQL errors
            ^

Error: ER_NOT_SUPPORTED_AUTH_MODE: Client does not support authentication protocol requested by server; consider upgrading MySQL client
    at Handshake.Sequence._packetToError (C:\Users\mysql-
test\node_modules\mysql\lib\protocol\sequences\Sequence.js:52:14)
    at Handshake.ErrorPacket (C:\Users\mysql-test\node_mo
dules\mysql\lib\protocol\sequences\Handshake.js:130:18)
    at Protocol._parsePacket (C:\Users\mysql-test\node_mo
dules\mysql\lib\protocol\Protocol.js:279:23)
    at Parser.write (C:\Users\mysql-test\node_modules\mys
ql\lib\protocol\Parser.js:76:12)
    at Protocol.write (C:\Users\mysql-test\node_modules\m
ysql\lib\protocol\Protocol.js:39:16)
    at Socket. (C:\Users\mysql-test\node_modul
es\mysql\lib\Connection.js:103:28)
    at Socket.emit (events.js:159:13)
    at addChunk (_stream_readable.js:265:12)
    at readableAddChunk (_stream_readable.js:252:11)
    at Socket.Readable.push (_stream_readable.js:209:10)
    --------------------
    at Protocol._enqueue (C:\Users\mysql-test\node_module
s\mysql\lib\protocol\Protocol.js:145:48)
    at Protocol.handshake (C:\Users\mysql-test\node_modul
es\mysql\lib\protocol\Protocol.js:52:23)
    at Connection.connect (C:\Users\mysql-test\node_modul
es\mysql\lib\Connection.js:130:18)
    at Object. (C:\Users\mysql-test\server.js:
11:5)
at Module._compile (module.js:660:30)
at Object.Module._extensions..js (module.js:671:10)
at Module.load (module.js:573:32)
at tryModuleLoad (module.js:513:12)
at Function.Module._load (module.js:505:3)
at Function.Module.runMain (module.js:701:10)

解决办法

• 第一种、升级mysql客户端client

• 第二种

  进入mysql命令行执行

  ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'password';
  

  flush privileges;
  

  就可以了！
  参考来源stackoverflow
  其他canal连接不上的问题解决方案