Contents
How does a pacemaker detect cluster logs?
The main Pacemaker log file is /var/log/pacemaker/pacemaker. log . In case you cannot find the log files, check the logging settings in /etc/sysconfig/pacemaker , Pacemaker’s own configuration file.
How do I stop Suse cluster?
Procedure 17.1: Manually Rebooting a Cluster Node Report Documentation Bug #
- On the node you want to reboot or shut down, log in as root or equivalent.
- Put the node into standby mode: root # crm -w node standby.
- Check the cluster status with: root # crm status.
- Stop the cluster services on that node:
- Reboot the node.
What is Corosync ring?
Corosync is the messaging layer inside your cluster. It is responsable for several things like: Cluster membership and messaging thanks to the Totem Single Ring Ordering and Membership protocol. Quorum calculation. Availability manager.
What is Totem in Corosync?
Corosync uses the totem protocol for “heartbeat” like monitoring of the other node’s health. A token is passed around to each node, the node does some work (like acknowledge old messages, send new ones), and then it passes the token on to the next node. This goes around and around all the time.
What is fence device in Redhat cluster?
Fencing is the disconnection of a node from the cluster’s shared storage. Fencing cuts off I/O from shared storage, thus ensuring data integrity. The cluster infrastructure performs fencing through the fence daemon, fenced .
What is RGManager in Red Hat cluster?
RGManager manages and provides failover capabilities for collections of cluster resources called services, resource groups, or resource trees. How RGManager works is that it allows administrators to define, configure, and monitor cluster services.
What is the difference between Corosync and pacemaker?
Pacemaker is an open source cluster resource manager (CRM), a system that coordinates resources and services that are managed and made highly available by a cluster. In essence, Corosync enables servers to communicate as a cluster, while Pacemaker provides the ability to control how the cluster behaves.
When does Corosync start and when does it shut down?
service corosync start. corosync is started but shuts down itself immediately. After the log entry “Completed service synchronization, ready to provide service.” there is an entry “Node was shut down by a signal” and the shutdown starts. This is the complete log output:
What are the current votes for Corosync Cluster Computing?
Current votes: 1 expected_votes: 2 notice [VOTEQ ] Waiting for all cluster members. Current votes: 1 expected_votes: 2 notice [VOTEQ ] Waiting for all cluster members.
How does a pacemaker Server manage a cluster?
At the same time, pacemaker also provides a management interface that allows administrators to manage these cluster resources. For pacemaker, the server can manage the cluster resources, It has three levels.