Networking for On-Demand Services

This section describes networking considerations for VMware Tanzu GemFire for VMs.

Service Network Requirement

When you deploy VMware Tanzu Application Service for VMs (TAS for VMs), you must create a statically defined network to host the component VMs that make up the infrastructure. Components, such as Cloud Controller and UAA, run on this infrastructure network.

On-demand services might require you to host them on a separate network from the default network. You can also deploy on-demand services on a separate service networks to meet your own security requirements.

TAS for VMs supports dynamic networking. Operators can use dynamic networking with asynchronous service provisioning to define dynamically-provisioned service networks. For more information, see Default Network and Service Network below.

On-demand services are enabled by default on all networks. Operators can optionally create separate networks to host services in BOSH Director. Operators can select which network hosts on-demand service instances when they configure the tile for that service.

Default Network and Service Network

On-demand Tanzu GemFire services use BOSH to dynamically deploy VMs and create single-tenant service instances in a dedicated network. On-demand services use the dynamically-provisioned service network to host single-tenant worker VMs. These worker VMs run as service instances within development spaces.

This on-demand architecture has the following advantages:

  • Developers can provision IaaS resources for their services instances when the instances are created. This removes the need for operators to pre-provision a fixed amount of IaaS resources when they deploy the service broker.
  • Service instances run on a dedicated VM and do not share VMs with unrelated processes. This removes the “noisy neighbor” problem, where an app monopolizes resources on a shared cluster.
  • Single-tenant services can support regulatory compliances where sensitive data must be separated across different machines.

An on-demand service separates operations between the default network and the service network. Shared service components, such as executive controllers and databases, Cloud Controller, UAA, and other on-demand components, run on the default network. Worker pools deployed to specific spaces run on the service network.

The diagram below shows worker VMs in an on-demand service instance running on a separate services network, while other components run on the default network.

Diagram shows a Default Network and
Services Network. The Default Network shows the Cloud Controller, communicatinng to the On-Demand Broker, which communicates using cf create-service to the BOSH Director, 
which communicates to the On-Demand Instances for CF Space, which has several Worker VMs.

View a larger version of this image

Required Networking Rules for On-Demand Services

Before deploying a service tile that uses the on-demand service broker (ODB), you must create networking rules to enable components to communicate with ODB. For instructions for creating networking rules, see the documentation for your IaaS.

The following table lists key components and their responsibilities in the on-demand architecture.

Key Components Component Responsibilities
BOSH Director Creates and updates service instances as instructed by ODB.
BOSH Agent Adds an agent on every VM that it deploys. The agent listens for instructions from the BOSH Director and executes those instructions. The agent receives job specifications from the BOSH Director and uses them to assign a role or job to the VM.
BOSH UAA Issues OAuth2 tokens for clients to use when they act on behalf of BOSH users.
VMware Tanzu Application Service for VMs Contains the apps that consume services.
ODB Instructs BOSH to create and update services. Connects to services to create bindings.
Deployed service instance Runs the given service. For example, a deployed Tanzu GemFire service instance runs the Tanzu GemFire service.


Regardless of the specific network layout, the operator must ensure network rules are set up so that connections are open as described in the table below.

This component… Must communicate with… Default TCP Port Communication direction(s) Notes
Tanzu GemFire cluster members Tanzu GemFire cluster members 49152-65535 Two-way Inclusive range. Tanzu GemFire servers and locators communicate with each other using UDP and TCP.
Tanzu GemFire Service Instance 1 Tanzu GemFire Service Instance 2 5000-5499 Two-way Inclusive range. Gateway receivers and gateway senders communicate across WAN-separated service instances. Each Tanzu GemFire service instance uses cluster defaults for the gateway receiver ports.
ODB
  • BOSH Director
  • BOSH UAA
  • 25555 (BOSH Director)
  • 8443 (UAA)
  • 8844 (CredHub)
One-way The BOSH Director and BOSH UAA default ports are not configurable.
The CredHub default port is configurable.
ODB VMware Tanzu Application Service for VMs 8443 One-way The default port is not configurable.
Errand VMs
  • VMware Tanzu Application Service for VMs
  • ODB
  • 443
  • 8080
One-way The default port is not configurable.
BOSH Agent BOSH Director 4222 Two-way The BOSH Agent runs on every VM in the system, including the BOSH Director VM. The BOSH Agent initiates the connection with the BOSH Director.
The default port is not configurable.
Deployed apps on VMware Tanzu Application Service for VMs Deployed service instances
  • 55221 (Apache Geode locators)
  • 40404 (Apache Geode servers)
Two-way These port numbers are not configurable.
VMware Tanzu Application Service for VMs
  • ODB
  • Deployed service instances
8080 One-way PAS communicates with service instances because the Gorouter proxies gfsh requests to clusters.
Tanzu GemFire Tanzu GemFire 1053 Two-way Allows DNS resolution for clusters communicating across a WAN-connected system.

Tanzu GemFire Instances Across WAN

Tanzu GemFire service instances running within distinct VMware Tanzu Application Service for VMs foundations may communicate with each other across a WAN. In a topology such as this, the members within one service instance use their own private address space, as defined in RFC1918.

A VPN may be used to connect the private network spaces that lay across the WAN. The steps required to enable the connectivity by VPN are dependent on the IaaS provider(s).

The private address space for each service instance’s network must be configured with non-overlapping CIDR blocks. Configure the network prior to creating service instances. Locate directions for creating a network on the appropriate IAAS provider within the section titled Architecture and Installation Overview.

Open port 1053 to allow DNS resolution of other WAN-connected clusters.