MySQL Server 上新引入的 SSL 连接现在默认安装在 CentOS 6.7 默认代表上。
只需删除证书文件即可按照文档解决此问题：
“如果服务器在数据目录中找不到有效的证书和密钥文件，它将继续执行，但不会启用安全连接。” 参考：http://dev.mysql.com/doc/refman/5.7/en/secure-connections.html
但是我想完全禁用 MySQL 服务器上的 SSL 连接插件，因为我想通过删除所有我不使用的东西来优化 MySQL 服务器的性能，其中包括这个插件。
如何在 MySQL 社区服务器上禁用 SSL？
答案1
我的测试：
$ mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.7.12 MySQL Community Server (GPL)
Copyright (c) 2000, 2016, 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 VARIABLES LIKE '%ssl%';
+---------------+-----------------+
| Variable_name | Value |
+---------------+-----------------+
| have_openssl | YES |
| have_ssl | YES |
| ssl_ca | ca.pem |
| ssl_capath | |
| ssl_cert | server-cert.pem |
| ssl_cipher | |
| ssl_crl | |
| ssl_crlpath | |
| ssl_key | server-key.pem |
+---------------+-----------------+
9 rows in set (0.00 sec)
编辑配置文件：/path/to/file/my.cnf
[mysqld]
...
skip_ssl
# disable_ssl
...
$ service mysql restart
$ mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.7.12 MySQL Community Server (GPL)
Copyright (c) 2000, 2016, 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 VARIABLES LIKE '%ssl%';
+---------------+----------+
| Variable_name | Value |
+---------------+----------+
| have_openssl | DISABLED |
| have_ssl | DISABLED |
| ssl_ca | |
| ssl_capath | |
| ssl_cert | |
| ssl_cipher | |
| ssl_crl | |
| ssl_crlpath | |
| ssl_key | |
+---------------+----------+
9 rows in set (0.00 sec)