Contents
What is Corosync in Pacemaker?
Corosync is an open source program that provides cluster membership and messaging capabilities, often referred to as the messaging layer, to client servers. In essence, Corosync enables servers to communicate as a cluster, while Pacemaker provides the ability to control how the cluster behaves.
What is pcs STONITH?
STONITH is an acronym for Shoot-The-Other-Node-In-The-Head and it protects your data from being corrupted by rogue nodes or concurrent access.
What is pcs command?
The pcs command line interface controls and configures corosync and Pacemaker by providing an interface to the corosync. conf and cib. xml files. The general format of the pcs command is as follows.
What is SBD Pacemaker?
SBD (STONITH Block Device) provides a node fencing mechanism for Pacemaker-based clusters through the exchange of messages via shared block storage (SAN, iSCSI, FCoE, etc.). SBD needs a watchdog on each node to ensure that misbehaving nodes are really stopped.
What is the difference between Corosync and pacemaker?
Pcs is a Corosync and Pacemaker configuration tool. It permits users to easily view, modify and create Pacemaker based clusters. Pcs contains pcsd, a pcs daemon, which operates as a remote server for pcs and provides a web UI.
How to start a PC cluster with pacemaker?
[jensd@node01 ~]$ sudo pcs cluster start –all node02: Starting Cluster… node01: Starting Cluster… You could also start the pacemaker and corosync services on both nodes (as will happen at boot time) to accomplish this.
How to set up a Corosync Cluster 2?
2.1 Enabling Access to the Pacemaker and Corosync Packages 2.2 Installing and Enabling the Pacemaker and Corosync Service This chapter describes how to set up and configure the Pacemaker and Corosync features to create a high availability (HA) cluster that delivers continuous access to services running across multiple nodes.
What are the ports for the pacemaker node?
port 2224 (used by the pcsdaemon), port 3121 (for Pacemaker Remote nodes), port 21064 (for DLM resources), and UDP ports 5405 (for Corosync clustering), and 5404 (for Corosync multicast, if configured):