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Servers

The Server page is accessed from Cluster Setup | Servers.

The ability to quickly and efficiently match the strength of the clustered application server to business demand is a huge plus from a business standpoint – for instance, rapidly add nodes to handle a spike in traffic to a web store during the holiday season.

The Servers page is a central configuration page for creating a clustered environment that will be governed by Zend Server Cluster Manager. Creating a clustered environment is a process of associating Webservers running the same application to a single point of management.

Note:

Once a server is added to your cluster the Administration Interface on the Server's side will be disabled and all configurations will be done using Zend Server Cluster Manager. Releasing the server from the cluster will also release the Administration Interface on the server's side.

To associate a cluster of servers under Zend Server Cluster Manager there are a few prerequisites:

Each server needs to be running the same exact version of Zend Server.
Each Server requires identical configurations.
The servers in the cluster need to be running the same operating system however the server running the cluster manager can be different.

Once the servers are associated under Zend Server Cluster Manager, all the settings and configurations will be governed by Zend Server Cluster Manager. When adding a new server to the cluster created under Zend Server Cluster Manager you have two choices, to propagate the current settings of the added server or to change the added server's setting according to the current Zend Server Cluster Manager's settings (unless it's the first server you added).

If you choose to propagate the settings of the added server, all the servers currently belonging to the cluster will automatically be updated with the new servers settings. Once in a cluster environment, all the servers need to have exactly the same configurations in order to work smoothly.

If for some reason the master server is no longer available (removed, down, etc.) the next server in line will become the master server.

From the Servers page you can:

Add Server: Add a server on which Zend Server is installed, once added the server will be managed and controlled by Zend Server.
To already added servers you can:

Remove - completely removes the association with the Server. If in the future you want to add the server again you can add it as if it is a server that was added for the first time. When removing a server the Zend Server Cluster Manager settings will not be changed including the license even if there was another license there prior to the server being added to the cluster.
Re-match Cluster - realign the configurations on the server to the Zend Server's settings. This will overwrite any configurations on the Server.
View Status - if a server is not available or one of the server's settings has changed the server's status will change.
Force Remove - The force remove option is available when a server cannot for some reason be removed from the cluster. This is normally the case when trying to remove the last node from a cluster or when the regular removal hangs for more than a minute. Force Remove releases the user interface on the node's side without performing any shutdown actions that preserve information such as graceful shutdown for session information.

Important Note:

Before using Force Remove try to access the node you are trying to remove and see if you can locate the reason it could not be removed properly.


	Related Links: Cluster Management