Cluster Configuration Files and Troubleshooting
When you use the cluster configuration service in GemFire, you can examine the generated configuration files in the
cluster_config directory on the locator.
gfsh saves configuration files at the cluster-level and at the individual group-level.
The following directories and configuration files are available on the locator running the cluster configuration service:
For configurations that apply to all members of a cluster, the locator creates a
cluster subdirectory within the
cluster_config directory (or in the cluster configuration directory when starting up the locator with the
--cluster-config-dir=value parameter) specified. All servers receive this configuration when they are started using
gfsh. This directory contains:
cluster.xml– A GemFire
cache.xmlfile containing configuration common to all members
cluster.properties– a GemFire
gemfire.propertiesfile containing properties common to all members
- Jar files that are intended for deployment to all members
When you specify the
--groups parameter in a
gfsh command, (for example,
start server or
create region) the locator writes the configurations for each group in a subdirectory with the same name as the group. When you start a server that specifies one or more group names, the server receives both the cluster-level configurations and the configurations from all groups specified. This subdirectory contains:
<group-name>.xml– A GemFire
cache.xmlfile containing configurations common to all members of the group
<group-name>.properties– A GemFire
gemfire.propertiesfile containing properties common to all members of the group
- Jar files that are intended for deployment to all members of the group
You can export a zip file that contains all artifacts of a cluster configuration. The zip file contains all of the files in the
cluster_config (or otherwise specified) subdirectory of a locator. You can import this configuration to a new cluster. See Exporting and Importing Cluster Configurations.
Individual Configuration Files and Cluster Configuration Files
GemFire applies the cluster-wide configuration files first and then group-level configurations next. If a member has its own configuration files defined (cache.xml and gemfire.properties files), those configurations are applied last. Whenever possible, use the member group-level configuration files in the cluster configuration service to apply non-cluster-wide configurations on individual members.
When you start a locator using
gfsh, you should see the following message:
Cluster configuration service is up and running.
If you do not see this message, there may be a problem with the cluster configuration service. Use the
status cluster-config-servicecommand to check the status of the cluster configuration.
- If the command returns RUNNING, the cluster configuration is running normally.
- If the command returns WAITING, run the
status locatorcommand. The output of this command returns the cause of the WAITING status.
If a server start fails with the following exception:
ClusterConfigurationNotAvailableException, the cluster configuration service may not be in the RUNNING state. Because the server requests the cluster configuration from the locator, which is not available, the
start servercommand fails.
You can determine what configurations a server received from a locator by examining the server’s log file. See Logging.
start servercommand specifies a cache.xml file that conflicts with the existing cluster configuration, the server startup may fail.
gfshcommand fails because the cluster configuration cannot be saved, the following message displays:
Failed to persist the configuration changes due to this command, Revert the command to maintain consistency. Please use "status cluster-config-service" to determine whether Cluster configuration service is RUNNING."
There are some types of configurations that cannot be made using
gfsh. See gfsh Limitations.