Discovery by TCP

If multicast is not the preferred way of discovery for your environment, then you can configure Hazelcast to be a full TCP/IP cluster. When you configure Hazelcast for discovery by TCP/IP, you must list all or a subset of the nodes' hostnames and/or IP addresses. You do not have to list all the cluster members, but at least one of the listed members has to be active in the cluster when a new member joins.

The following is an example declarative configuration. You should set the enabled attribute of the tcp-ip element to true.

      <multicast enabled="false">
      <tcp-ip enabled="true">

As shown above, you can provide IP addresses or hostnames for member elements. You can also give a range of IP addresses, such as

Instead of providing members line by line as shown above, you also have the option to use the members element and write comma-separated IP addresses, as shown below.


If you do not provide ports for the members, Hazelcast automatically tries the ports 5701, 5702, and so on.

By default, Hazelcast binds to all local network interfaces to accept incoming traffic. You can change this behavior using the system property hazelcast.socket.bind.any. If you set this property to false, Hazelcast uses the interfaces specified in the interfaces element (please refer to the Interfaces Configuration section). If no interfaces are provided, then it will try to resolve one interface to bind from the member elements.


Please refer to the tcp-ip element section for the full description of discovery by TCP/IP configuration.