PHP应用程序的服务器集群发送请求与代码错误赏析（zend server）

Zend Server提供企业级的Web应用服务器，特别是对PHP应用程序的支持很完美。Zend Server服务器的集群管理方法有很多，下面介绍下服务器集群连接的请求参数和错误代码。

请求参数：

Parameter	Type	Required	Description
serverName	String	Yes	Server name
dbHost	String	Yes	Database host address to join the cluster
dbUsername	String	Yes	Database credentials (username)
dbPassword	String	Yes	Database credentials (password)
nodeIp	String	Yes	Server IP
dbName	String	Yes	Database name
failIfConnected	Boolean	No	Cause the action to completely fail if the server is already connected. Otherwise, a normal 200 status is returned without performing any action. Default: false

错误代码：

HTTP Code	Error Code	Description
400	alreadyConnected	The server is already a member of a cluster (not necessarily the current cluster)
400	wrongPassword	Provided GUI password is incorrect
405	notImplementedByEdition	This method is only available on Professional or Enterprise editions
500	invalidServerResponse	Invalid or unexpected response from new server
500	serverNotLicensed	Zend Server is not licensed
500	noActiveServers	The server cannot be added because all servers in the cluster are disabled or unreachable
500	cantConnectToServer	Zend Server is unable to connect to the specified Server URL
503	temporarilyLocked	The server cannot be added because a cluster member is in graceful startup / shutdown mode