clusvcmgrd(8) Red Hat Cluster Suite clusvcmgrd(8)NAME
rgmanager - Resource Group (Cluster Service) Manager Daemon
DESCRIPTION
rgmanager handles management of user-defined cluster services (also known as resource groups). This includes handling of user requests
including service start, service disable, service relocate, and service restart. The service manager daemon also handles restarting and
relocating services in the event of failures.
HOW IT WORKS
The service manager is spawned by an init script after the cluster infrastructure has been started and only functions when the cluster is
quorate and locks are working.
During initialization, the service manager runs scripts which ensure that all services are clear to be started. After that, it determines
which services need to be started and starts them.
When an event is received, members which are no longer online have their services taken away from them. The event should only occur in the
case that the member has been fenced whenever fencing is available.
When a cluster member determines that it is no longer in the cluster quorum, the service manager stops all services and waits for a new
quorum to form.
COMMAND LINE OPTIONS -f Run in the foreground (do not fork).
-d Enable debug-level logging.
-w Disable internal process monitoring (for debugging).
-N Do not perform stop-before-start. Combined with the -Z flag to clusvcadm, this can be used to allow rgmanager to be upgraded with-
out stopping a given user service or set of services.
SEE ALSO clusvcadm(8)
Jan 2005 clusvcmgrd(8)
Check Out this Related Man Page
VOTEQUORUM_OVERVIEW(8) Corosync Cluster Engine Programmer's Manual VOTEQUORUM_OVERVIEW(8)NAME
votequorum_overview - Votequorum Library Overview
OVERVIEW
The votequuorum library is delivered with the corosync project. It is the external interface to the vote-based quorum service. This service
is optionally loaded into all ndes in a corosync cluster to avoid split-brain situations. It does this by having a number of votes assigned
to each system in the cluster and ensuring that only when a majority of the votes are present, cluster operations are allowed to proceed.
The library provides a mechanism to:
* Query the quorum status
* Get a list of nodes known to the quorum service
* Receive notifications of quorum state changes
* Change the number of votes assigned to a node
* Change the number of expected votes for a cluster to be quorate
* Connect an additional quorum device to allow small clusters to remain quorate during node outages.
votequorum reads its configuration from the objdb. The following keys are read when it starts up:
* quorum.expected_votes
* quorum.votes
* quorum.quorumdev_poll
* quorum.disallowed
* quorum.two_node
Most of those values can be changed while corosync is running with the following exceptions: quorum.disallowed cannot be changed, and
two_node cannot be set on-the-fly, though it can be cleared. ie you can start with two nodes in the cluster and add a third without reboot-
ing all the nodes.
BUGS
This software is not yet production, so there may still be some bugs.
SEE ALSO corosync-quorumtool(8), votequorum_initialize(3), votequorum_finalize(3), votequorum_fd_get(3), votequorum_dispatch(3), votequorum_con-
text_get(3), votequorum_context_set(3),
corosync Man Page 2009-01-26 VOTEQUORUM_OVERVIEW(8)
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