2013 10 /23
root@compute01:/var/log/nova# nova-manage db sync
Command failed, please check log for more info
2013-10-23 09:10:09 CRITICAL nova [-] (OperationalError) (1129, "Host 'compute01' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'") None None
root@compute01:/var/log/nova# mysqladmin flush-hosts
mysqladmin: connect to server at 'localhost' failed
error: 'Access denied for user 'root'@'localhost' (using password: NO)'
root@compute01:/var/log/nova# mysqld_safe --max_connect_errors=10000 &
[1] 694
原因：超出mysql默认连接数
解决方法：进入mysql
> SET GLOBAL max_connect_errors=10000;
nova-vncproxy 组件没装好 导致 客户端没法访问