排错经历：openstack搭建dashboard进入输入帐号密码登录后报错

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查看error日志：

cat /var/log/httpd/error.log

[Thu Oct 13 13:37:00 2016] [error] raise exceptions.ConnectionFailed(reason=_("Maximum attempts reached"))

[Thu Oct 13 13:37:00 2016] [error] ConnectionFailed: Connection to neutron failed: Maximum attempts reached

neutron日志显示neutron的用户密码：

cat /var/log/neutron/server.log

perationalError: (OperationalError) (1045, "Access denied for user 'neutron'@'controller' (using password: YES)") None None

进入mysql查看果然：

[root@controller images]# mysql -uroot -p123456

mysql&gt; SELECT user,host,password FROM mysql.user;

+----------+------------+-------------------------------------------+

| user     | host       | password                                  |

| root     | localhost  | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |

| root     | controller | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |

| root     | 127.0.0.1  | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |

| keystone | localhost  | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |

| keystone | %          | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |

| glance   | localhost  | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |

| glance   | %          | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |

| nova     | localhost  | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |

| nova     | %          | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |

| neutron  | localhost  |                               |

| neutron  | %          |                               |

| cinder   | localhost  | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |

| cinder   | %          | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |

| heat     | localhost  | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |

| heat     | %          | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |

| sahara   | localhost  | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |

| sahara   | %          | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |

17 rows in set (0.06 sec)

解决：（重新建立用户，并授权）

mysql&gt; drop database neutron;

mysql&gt; create database neutron;

mysql&gt; GRANT ALL PRIVILEGES ON neutron.* TO 'neutron'@'localhost' IDENTIFIED BY '123456';

mysql&gt; GRANT ALL PRIVILEGES ON neutron.* TO 'neutron'@'%' IDENTIFIED BY '123456';

| neutron  | localhost  | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |

| neutron  | %          | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |

重启mysqld 、memcached 、httpd、neutron-server 服务

成功解决，登录正常进入dashboard界面。

      本文转自谢育政 51CTO博客，原文链接：<b>http://blog.51cto.com/kurolz/1861869</b>，如需转载请自行联系原作者