Difference between revisions of "CentOS Cluster Configuration"
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=gfs - global file system= | =gfs - global file system= | ||
=rgmanager - resource config= | =rgmanager - resource config= | ||
| + | Resource Group manager is a High Availability service. Rgmanager can start and stop services on nodes. If a service is failing on one node it will be started on another node. Rgmanager monitor the services and make sure they are actually runnning. | ||
| + | == Service Groups == | ||
| + | A ''Service Group'' is a group of nodes on which a specified service can be started or stopped by rgmanager. Not all nodes in a cluster need to be member of a ''Service Group''. There can be many ''Service Groups'' in a cluster.If a service fails, a script is called to automatically restart the service. If a node fails, the service may be relocated to a different node in the service group. | ||
| + | == What is a Cluster-service== | ||
| + | A Cluster-service is a resource that are shared among nodes. For example a ''apache'' WEB-service. This service can be run in two different ways. | ||
| + | ===active-passive Cluster-service=== | ||
| + | An active-passive Cluster-service is a service running on one node at a time. If the node running the service fails the service is started on another node in the Service Group. | ||
| + | ====active-passive example==== | ||
| + | == files and programs== | ||
| + | *''/usr/share/cluster'' - here lives the rgmanager scripts | ||
| + | *''/etc/cluster/cluster.conf'' - rgmanager configuration | ||
| + | *''clustat'' - See cluster and service status ''clustat -s SERVICE_NAME -l'' | ||
*[http://sources.redhat.com/cluster/wiki/FAQ/RGManager RedHAT rgmanager FAQ] | *[http://sources.redhat.com/cluster/wiki/FAQ/RGManager RedHAT rgmanager FAQ] | ||
Revision as of 08:09, 5 April 2009
Contents
cluster.conf configuration file
Configuration file for:
- cman - Cluster configuration
- fence - Fence configuration for disabling nodes with errors
- dlm - Distributed Lock Manager Configuration. Rules for access to shared resources
- gfs - Global file System configuration. Shared file systems among nodes.
- rgmanager - Resource Group manager configuration. Fx. apache service setup on cluster.
cman - Basci cluster config
fence - Fencing nodes
dlm - lock management
gfs - global file system
rgmanager - resource config
Resource Group manager is a High Availability service. Rgmanager can start and stop services on nodes. If a service is failing on one node it will be started on another node. Rgmanager monitor the services and make sure they are actually runnning.
Service Groups
A Service Group is a group of nodes on which a specified service can be started or stopped by rgmanager. Not all nodes in a cluster need to be member of a Service Group. There can be many Service Groups in a cluster.If a service fails, a script is called to automatically restart the service. If a node fails, the service may be relocated to a different node in the service group.
What is a Cluster-service
A Cluster-service is a resource that are shared among nodes. For example a apache WEB-service. This service can be run in two different ways.
active-passive Cluster-service
An active-passive Cluster-service is a service running on one node at a time. If the node running the service fails the service is started on another node in the Service Group.
active-passive example
files and programs
- /usr/share/cluster - here lives the rgmanager scripts
- /etc/cluster/cluster.conf - rgmanager configuration
- clustat - See cluster and service status clustat -s SERVICE_NAME -l
- RedHAT rgmanager FAQ