To modify an existing cluster, follow the steps below:

  1. Click Modify on the relevant cluster.

  2. Change the settings as needed.

The Type can be Default, Remote LM or Local LM:

  • Default: When the type of cluster is set to Default, the check is performed against the cluster using one of the following three available health checks:

    • None: No health check is performed. Therefore, the machine always appears to be up.

    • ICMP Ping: The health check is performed by pinging against the cluster IP address.

    • TCP Connect: The health check is performed by connecting to the cluster IP address on the port specified.

  • Local LM: When Local LM is selected as the Type, the Checkers field is automatically set to Not Needed. This is because the health check is not necessary because the cluster is the local machine.

  • Remote LM: The health check for this type of cluster is Implicit (it is performed using SSH).

The only difference between Remote LM and Local LM is that Local LM saves a TCP connection because it gets the information locally and not over TCP. Otherwise, the functionality is the same. Default is a generic cluster type that does not communicate with a LoadMaster. It uses TCP or ICMP health checks.

Remote LM and Local LM are only used when the target is a LoadMaster as opposed to a server or another resource. Local LM is used by GEO to check the LoadMaster it is enabled on.

When Default is selected, either ICMP Ping or TCP Connect can be selected as the health check type in the Checkers drop-down list.

When Remote LM or Local LM is selected, no health check options are available. Remote LM health checks are performed using SSH on port 22.

If needed, click Show Locations to enter the latitude and longitude of the location of the IP address.

Note: After a cluster is initially added, the health check marks it as Up by default. The status is updated after the next health check cycle.