Managing Clusters With the Web UI
Use the Cockpit HA Cluster Management web UI to create HA clusters and perform cluster management tasks such as stopping and starting clusters, and setting cluster level properties.
Creating a New Cluster
Use the Cockpit HA Cluster Management web UI to create a cluster from nodes on which
Pacemaker and Corosync configuration and hacluster
user authentication tasks
have been completed.
Steps
To create cluster in the HA Cluster Management web UI, perform the following steps:
Adding an Existing Cluster
Add an existing cluster to the Cockpit HA Cluster Management web UI application.
Steps
To add an existing cluster to the HA Cluster Management web UI application, perform the following steps:
Setting Cluster Properties
Use the Cockpit HA Cluster Management web UI application to set cluster proeprties.
The following table gives an overview of some cluster properties you can set in the HA Cluster Management web UI:
Property | Default | Overview |
---|---|---|
cluster-recheck-interval | 15min | A value of 0 disables polling. A positive value sets an interval in seconds, unless other units are specified, for example,5min. |
Enable ACLs | false | Boolean value that sets whether Access Control Lists (ACLs) can be used in the cluster to control user and group access. |
Stonith Enabled | true | Sets whether the cluster can fence failed nodes and nodes with resources that cannot be stopped. To avoid data loss and "split-brain" situation in a cluster. When set to true, at least one fence device must be configured before resources are allowed to run. |
No Quorum Policy | stop | What to do when the cluster does not have quorum. Possible values
include the following:
|
Stonith Action | reboot |
Action to send to fence device when a node must be fenced. Allowed values are reboot and off. |
For a more complete list of cluster properties, run pcs property
describe
.
Steps
To set a cluster's properties in the HA Cluster Management web UI application, perform the following steps:
Stopping and Starting Clusters
Stop and start clusters in the Cockpit HA Cluster Management web UI application.
Stopping a cluster in the web UI stops the pacemaker
and
corosync
services on each node in the cluster. Conversely,
starting a cluster in the web UI starts those services on each node.
The example procedure that follows assumes you intend to stop a running cluster and then start it again.
Steps
To stop and start a cluster in the HA Cluster Management web UI application, perform the following steps:
Removing a Cluster
This procedure shows you how to remove a cluster from the Cockpit HA Cluster Management web UI application.
Removing a cluster from an instance of the Cockpit HA Cluster Management application removes it from the web UI. However, the cluster continues to run and you can contiue administering it through the command line.
Steps
To remove a cluster from an instance of the HA Cluster Management web UI application, perform the following steps: