What is Corosync in Pacemaker?
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.
Which CRM command option displays the Corosync status?
The crm_mon command allows you to monitor your cluster’s status and configuration. Its output includes the number of nodes, uname, uuid, status, the resources configured in your cluster, and the current status of each. The output of crm_mon can be displayed at the console or printed into an XML or HTML file.
What is Pacemaker and Corosync administration tool?
Pacemaker features two configuration tools for cluster deployment, monitoring, and management. A command-line based program, pcs can perform the following cluster management tasks: Create and configure a Pacemaker/Corosync cluster. Modify configuration of the cluster while it is running.
How do you start a resource in a Pacemaker cluster?
Create the LVM Cluster resources (vg & lv ), File-system cluster Resources:
- Create the cluster volume group resource.
- Create the cluster mount resource.
- Before adding the resource, you must update the local /etc/httpd/conf/httpd.
- Check the apache server status .
How does Linux check Pacemaker cluster status?
Start the cluster stack on both cluster nodes using the following command. Verify Pacemaker status. At first, the pcs cluster status output will look like this. After about a minute, you should see your two cluster nodes come online.
How do you check a Pacemaker log?
A. 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. If PCMK_logfile is configured there, Pacemaker will use the path that is defined by this parameter.
How do you check a pacemaker log?
How do you remove a resource from a pacemaker cluster?
Proceed as follows to remove a cluster resource:
- Log in as root and start the crm interactive shell: root # crm configure.
- Run the following command to get a list of your resources: crm(live)# resource status.
- Delete the resource with the relevant identifier (which implies a commit too):
- Commit the changes:
How do you remove a resource from a Pacemaker cluster?
How do I restart computer resources?
Service Management Quick Start pcs resource enable resource_name to enable a disabled service. pcs resource restart resource_name to restart a running resource. pcs resource move resource_name to move a running resource to a new node.
Why do I need to configure Corosync and pacemaker?
Corosync and Pacemaker are now installed but they need to be configured before they will do anything useful. Corosync must be configured so that our servers can communicate as a cluster. In order to allow nodes to join a cluster, Corosync requires that each node possesses an identical cluster authorization key.
How do I configure Corosync to communicate as a cluster?
Corosync must be configured so that our servers can communicate as a cluster. In order to allow nodes to join a cluster, Corosync requires that each node possesses an identical cluster authorization key. On the primary server, install the haveged package:
How do I create a cluster configuration file in pacemaker?
PaceMaker cluster command to create new cluster configuration file. This file will be created on current location, you can add multiple cluster resource into this configuration file and apply them by using cib-push command. PaceMaker cluster command to apply the resource created in configuration file into cluster.
What are the changes to OCFS2 file system parameters?
Changes OCFS2 file system parameters, including the volume label, number of node slots, journal size for all node slots, and volume size. Before you can create OCFS2 volumes, you must configure the following resources as services in the cluster: DLM and a STONITH resource.
