|Home > Documentation > User's guide > Clustering > Farming|
A configuration can be deployed to a cluster of Geronimo servers via a single logical deployment step. Once deployed to a cluster, this configuration can then be transparently started, stopped or undeployed across all the cluster members.
These two features greatly streamline the maintenance of applications running on a cluster as Geronimo takes care of cluster-wide application distribution and management for you.
To deploy a configuration to configured members, you simply deploy it to the MasterConfigurationStore repository defined by the farming configuration. This configuration being stopped out-of-the-box, you may have to start it the first time via this GShell command:
farming adds two new repositories to the server: MasterConfigurationStore and ClusterStore. MasterConfigurationStore is the repository you should use most of the time if not always. ClusterStore is a repository you may have to use in specific and infrequent scenarios.
To deploy to MasterConfigurationStore, you pass the --targets flag to the distribute or deploy commands like this:
Following this deployment
To undeploy an application use the command
deploy --user system --password manager undeploy default/ClusterTestEAR/1.0/ear
With geronimo versions higher than 2.1.4 the _G_SLAVE is no longer being used. Instead geronimo uses _G_MASTER for its master application. Do not worry there are no problems for end user. The deployment steps still remains same however for undeployment the user has to use following command.
deploy --user system --password manager undeploy default/ClusterTestEAR_G_MASTER/1.0/ear
To start, stop or undeploy configurations across a cluster, you perform the relevant deployment task against the virtual configuration. All the cluster members configured at the time of the initial deployment must be running otherwise these operations are partially executed. For instance, if three members were configured and only two of them are running when the virtual configuration is undeployed, then the configuration is removed from the ClusterStore of the two running servers. The ClusterStore of the third server still contains the configuration and this latter will have to be manually undeployed on this server.