Name

The name of the cluster.

Location

If needed, the Show Locations button can be clicked to enter the latitude and longitude of the location of the IP address.

Type

The cluster 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).

When using Real Server Load as the Selection Criteria, and the cluster Type is set to Local LM or Remote LM, a drop-down list appears called Mapping Menu. The Mapping Menu drop-down list displays a list of Virtual Service names (where available) and Virtual Service IP addresses from that LoadMaster. If there are multiple Virtual Services using the same port, there is an entry in the drop-down list for the Virtual Service with up to five ports shown and other individual entries with each port. Select the Virtual IP address and port (or ports) that is associated with this mapping. If a Virtual Service with multiple ports is selected, the health check checks all Virtual Services with the same IP address as the one selected. If one of them is in an “Up” status, the FQDN shows as “Up”. The port does not come into consideration. If a Virtual Service with one port is selected, the health check only checks against the health of that Virtual Service when updating the health of the FQDN.

The only difference between Remote LM and Local LM is that it saves a TCP connection because it gets the information locally and not over TCP. Otherwise, the functionality is the same.

Checkers

The health check method used to check the status of the cluster.

If the Type is set to Default the health check methods available are ICMP Ping and TCP Connect.

If Remote LM or Local LM is selected as the Type, the Checkers dropdown list is unavailable.

Disable

If needed, a cluster can be disabled by clicking the Disable button in the Operation column.