MySQL初始安装登录：ERROR 2003 (HY000): Can‘t connect to MySQL server on

安装环境：

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[root@localhost ~]# hostnamectl
   Static hostname: (unset)
Transient hostname: localhost
         Icon name: computer-vm
           Chassis: vm 🖴
        Machine ID: 1d71fe6ef4c74a1684adcdaa8b7d4823
           Boot ID: bf812fd7a4374a74b891c8c55a6ebd1b
    Virtualization: vmware
  Operating System: CentOS Stream 9
       CPE OS Name: cpe:/o:centos:centos:9
            Kernel: Linux 5.14.0-527.el9.aarch64
      Architecture: arm64
   Hardware Vendor: VMware, Inc.
    Hardware Model: VMware20,1
  Firmware Version: VMW201.00V.24006586.BA64.2406042154
[root@localhost ~]#

MySQL版本：

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[root@localhost ~]# mysql --version
mysql  Ver 8.0.36 for Linux on aarch64 (Source distribution)

安装完毕，远程登录报错：

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➜  ~ mysql -h 192.168.86.129  -u root -p
Enter password:
ERROR 2003 (HY000): Can't connect to MySQL server on '192.168.86.129:3306' (61)

排查

1、开放端口

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[root@localhost ~]# firewall-cmd --zone=public --permanent --add-port=3306/tcp
success

2、检查MySQL服务

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[root@localhost ~]# systemctl status mysqld
● mysqld.service - MySQL 8.0 database server
     Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; preset: disabled)
     Active: active (running) since Sun 2024-12-29 19:55:39 CST; 1h 24min ago
   Main PID: 36797 (mysqld)
     Status: "Server is operational"
      Tasks: 39 (limit: 10104)
     Memory: 399.1M
        CPU: 51.468s
     CGroup: /system.slice/mysqld.service
             └─36797 /usr/libexec/mysqld --basedir=/usr

3、检查MySQL用户是否允许远程访问

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Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> SELECT user, host FROM mysql.user;
+------------------+-----------+
| user             | host      |
+------------------+-----------+
| mysql.infoschema | localhost |
| mysql.session    | localhost |
| mysql.sys        | localhost |
| root             | localhost |
+------------------+-----------+
4 rows in set (0.00 sec)

如果都为localhost，则根据规则设置允许远程访问

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mysql> UPDATE mysql.user SET host = '%' WHERE user = 'root' AND host = 'localhost';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)

设置完毕，此时再次尝试远程连接

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➜  ~ mysql -h 192.168.86.129  -u root -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 9
Server version: 8.0.36 Source distribution

Copyright (c) 2000, 2024, 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> exit;
Bye