mysqldump: Got error: 2005: Unknown MySQL server host 'lyn' (2) when trying to connect

这个错误提示表明你在使用mysqldump备份MySQL数据库时连接到MySQL服务器失败，原因是MySQL服务器的主机名被设置为'lyn'，但该主机名无法被识别。

你需要检查以下几点：

1. 请确认你输入的主机名是否正确，可以尝试使用IP地址代替主机名连接MySQL服务器。

2. 确认你的MySQL服务器是否已经启动并处于运行状态。

3. 检查你的网络连接是否正常，可以尝试使用ping命令检查网络连接是否通畅。

如果以上都没有解决问题，你可以尝试重新安装MySQL服务或者联系你的系统管理员协助解决。

相关问题

mysqldump: Got error: 2002:can't connect to local Mysql server through

This error message indicates that the mysqldump command was unable to connect to the local MySQL server. There are several possible reasons why this might be happening:

1. The MySQL server is not running. Make sure that the MySQL service is running on your machine.

2. The MySQL server is running on a different host or port. Check that you are connecting to the correct host and port in your mysqldump command.

3. The MySQL server is not configured to accept connections from your machine. Ensure that your machine is allowed to connect to the MySQL server by checking the server's firewall settings and the MySQL user privileges.

4. The MySQL socket file is missing or has the wrong permissions. Check that the socket file exists and has the correct permissions.

5. The MySQL configuration file is missing or has the wrong settings. Verify that the configuration file contains the correct settings for your MySQL installation.

Overall, this error message indicates a problem with the MySQL connection, so you should investigate the possible causes and troubleshoot accordingly.

mysqldump: Got error: 2002: Can't connect to local MySQL server through socket '' (111) when trying to connect

mysqldump: Got error: 2002: Can't connect to local MySQL server through socket '' (111) when trying to connect 是因为无法通过指定的socket连接到本地MySQL服务器。这个问题可能有几个可能的原因，比如MySQL服务器没有运行、socket文件路径错误或权限问题等。
要解决这个问题，你可以尝试以下几个方法：
1. 确保MySQL服务器正在运行。你可以通过运行`systemctl status mysql`（Linux）或`services.msc`（Windows）来检查MySQL服务的状态。
2. 检查socket文件的路径是否正确。在你的错误信息中，你可以看到两个不同的socket路径。你可以尝试使用正确的socket路径，或者在mysqldump命令中指定正确的socket路径。
3. 检查权限问题。确保你正在以足够的权限运行mysqldump命令。你可能需要使用管理员权限来运行mysqldump命令。