mysql> show full processlist;
+-----+----------------------+--------------------+------+---------+------+----------------------------------+-----------------------+
| Id | User | Host | db | Command | Time | State | Info |
+-----+----------------------+--------------------+------+---------+------+----------------------------------+-----------------------+
| 1 | system user | | NULL | Connect | 623 | Waiting for master to send event | NULL |
| 2 | system user | | NULL | Connect | 0 | Reading event from the relay log | NULL |
| 400 | root | localhost | v3 | Sleep | 68 | | NULL |
| 585 | root | localhost | v3 | Query | 0 | NULL | show full processlist |
| 748 | unauthenticated user | 172.19.0.27:32833 | NULL | Connect | NULL | login | NULL |
| 749 | unauthenticated user | 172.19.0.27:32836 | NULL | Connect | NULL | login | NULL |
| 750 | unauthenticated user | 172.19.0.27:32838 | NULL | Connect | NULL | login | NULL |
| 751 | unauthenticated user | 172.19.0.27:32841 | NULL | Connect | NULL | login | NULL |
| 752 | unauthenticated user | 172.19.0.27:32844 | NULL | Connect | NULL | login | NULL |
| 753 | unauthenticated user | 172.19.0.27:32846 | NULL | Connect | NULL | login | NULL |
| 754 | unauthenticated user | 172.19.0.27:32848 | NULL | Connect | NULL | login | NULL |
| 755 | unauthenticated user | 172.19.0.139:46827 | NULL | Connect | NULL | login | NULL |
| 756 | unauthenticated user | 172.19.0.139:46830 | NULL | Connect | NULL | login | NULL |
| 757 | unauthenticated user | 172.19.0.139:46831 | NULL | Connect | NULL | login | NULL |
| 758 | unauthenticated user | 172.19.0.27:32857 | NULL | Connect | NULL | login | NULL |
| 759 | unauthenticated user | 172.19.0.27:32858 | NULL | Connect | NULL | login | NULL |
| 760 | unauthenticated user | 172.19.0.27:32859 | NULL | Connect | NULL | login | NULL |
| 761 | unauthenticated user | 172.19.0.27:32863 | NULL | Connect | NULL | login | NULL |
| 762 | unauthenticated user | 172.19.0.27:32864 | NULL | Connect | NULL | login | NULL |
| 763 | unauthenticated user | 172.19.0.27:32866 | NULL | Connect | NULL | login | NULL |
| 764 | unauthenticated user | 172.19.0.27:32870 | NULL | Connect | NULL | login | NULL |
| 765 | unauthenticated user | 172.19.0.27:32871 | NULL | Connect | NULL | login | NULL |
| 766 | unauthenticated user | 172.19.0.139:46833 | NULL | Connect | NULL | login | NULL |
| 767 | unauthenticated user | 172.19.0.27:32878 | NULL | Connect | NULL | login | NULL |
| 768 | unauthenticated user | 172.19.0.27:32881 | NULL | Connect | NULL | login | NULL |
| 769 | unauthenticated user | 172.19.0.27:32885 | NULL | Connect | NULL | login | NULL |
| 770 | unauthenticated user | 172.19.0.139:46835 | NULL | Connect | NULL | login | NULL |
| 771 | unauthenticated user | 172.19.0.27:32888 | NULL | Connect | NULL | login | NULL |
| 772 | unauthenticated user | 172.19.0.27:32890 | NULL | Connect | NULL | login | NULL |
| 773 | unauthenticated user | 172.19.0.139:46837 | NULL | Connect | NULL | login | NULL |
| 774 | unauthenticated user | 172.19.0.139:46839 | NULL | Connect | NULL | login | NULL |
| 775 | unauthenticated user | 172.19.0.139:46841 | NULL | Connect | NULL | login | NULL |
| 776 | unauthenticated user | 172.19.0.139:46844 | NULL | Connect | NULL | login | NULL |
| 777 | unauthenticated user | 172.19.0.139:46845 | NULL | Connect | NULL | login | NULL |
| 778 | unauthenticated user | 172.19.0.139:46847 | NULL | Connect | NULL | login | NULL |
| 779 | unauthenticated user | 172.19.0.27:32898 | NULL | Connect | NULL | login | NULL |
| 780 | unauthenticated user | 172.19.0.27:32900 | NULL | Connect | NULL | login | NULL |
| 781 | unauthenticated user | 172.19.0.139:46850 | NULL | Connect | NULL | login | NULL |
| 782 | unauthenticated user | 172.19.0.139:46852 | NULL | Connect | NULL | login | NULL |
| 783 | unauthenticated user | 172.19.0.139:46854 | NULL | Connect | NULL | login | NULL |
| 784 | unauthenticated user | 172.19.0.139:46857 | NULL | Connect | NULL | login | NULL |
| 785 | unauthenticated user | 172.19.0.139:46859 | NULL | Connect | NULL | login | NULL |
| 786 | unauthenticated user | 172.19.0.27:32903 | NULL | Connect | NULL | login | NULL |
| 787 | unauthenticated user | 172.19.0.139:46862 | NULL | Connect | NULL | login | NULL |
| 788 | unauthenticated user | 172.19.0.139:46865 | NULL | Connect | NULL | login | NULL |
| 789 | unauthenticated user | 172.19.0.139:46866 | NULL | Connect | NULL | login | NULL |
| 790 | unauthenticated user | 172.19.0.139:46868 | NULL | Connect | NULL | login | NULL |
| 791 | unauthenticated user | 172.19.0.139:46871 | NULL | Connect | NULL | login | NULL |
| 792 | unauthenticated user | 172.19.0.139:46873 | NULL | Connect | NULL | login | NULL |
| 793 | unauthenticated user | 172.19.0.27:32907 | NULL | Connect | NULL | login | NULL |
| 794 | unauthenticated user | 172.19.0.27:32909 | NULL | Connect | NULL | login | NULL |
| 795 | unauthenticated user | 172.19.0.27:32911 | NULL | Connect | NULL | login | NULL |
| 796 | unauthenticated user | 172.19.0.139:46875 | NULL | Connect | NULL | login | NULL |
| 797 | unauthenticated user | 172.19.0.27:32914 | NULL | Connect | NULL | login | NULL |
| 798 | unauthenticated user | 172.19.0.27:32916 | NULL | Connect | NULL | login | NULL |
| 799 | unauthenticated user | 172.19.0.139:46877 | NULL | Connect | NULL | login | NULL |
| 800 | unauthenticated user | 172.19.0.139:46879 | NULL | Connect | NULL | login | NULL |
+-----+----------------------+--------------------+------+---------+------+----------------------------------+-----------------------+
57 rows in set (0.00 sec)
答案 0 :(得分：28)
“用户”列中与“未经身份验证的用户”的连接已启动连接但尚未发送他/她的凭据，因此服务器无法确切知道谁正在连接。
如果此类连接仅在经过身份验证时显示在列表中，则可能会从可用套接字中运行服务器，您甚至不知道原因。
大多数情况下卡住的连接都归因于DNS not resolving properly, which the skip-name-resolve option will help with。
Pythian博客上的答案 1 :(得分：5)
您可能需要使用skip-name-resolve，因为mysql正在尝试解析mysql主机地址，或者在文件/ etc / hosts中添加要连接的主机名，或者两者都添加。奖励：修复您的DNS导致查找超时的任何问题
答案 2 :(得分：1)
你有一个低thread_cache_size（mysql启动线程数）或max_connexion而mysql无法让新线程在创建新线程来处理这些连接
答案 3 :(得分：1)
我们的生产数据库遇到了这个问题。事实证明，在与数据库的连接上是SSL。由于网络流量很大（Django没有连接池），我们打开了很多与数据库的连接 - 猜测服务器因初始SSL握手而陷入困境。当我们关闭SSL到数据库时，事情就开始了。
答案 4 :(得分：0)
确实， skip-name-resolve 可以解决您的问题但不是我的情况。
此消息：＆＃34;未经身份验证的用户＆＃34;在用户列上显示＆＃34; show processlist＆＃34;可能意味着您使用的是旧加密密码。
就我而言，我使用新的加密格式重新创建了用户，如：
CREATE USER 'myuser'@'IP' IDENTIFIED BY PASSWORD '*DA7CC43A56959FE78FC336FB9D7185AAACCC44DD';
CREATE USER 'myuser'@'IP' IDENTIFIED BY 'mypassword';
答案 5 :(得分：-1)
我在 my.cnf 中添加了 skip_name_resolve = 1，解决了我的问题。