Secure ports usage

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Understanding which ports the hybrid runtime plane uses is important for enterprise implementations. This section describes the ports used for secure communications within the runtime plane as well as external ports used for communications with external services.

Internal connections

Communication between the runtime plane and management plane is secured with TLS 1-way and OAuth 2.0. Individual services use different protocols, depending on which service they are communicating with.

The certificates used for intra-component communication are generated by Apigee's certificate manager. You do not have to provide a certificate or manage it.

The following image shows the ports and communications channels within the hybrid runtime plane:

The following table describes the ports and communications channels within the hybrid runtime plane:

Internal Connections
Source		Destination	Protocol/Ports	Security protocol	Description
MART		Cassandra	TCP/9042 TCP/9142	mTLS	Sends data for persistence.
Apigee Connect		MART	TCP/8443	TLS	Requests from the management plane go through Apigee Connect. Apigee Connect initiates the connection.
Default Istio Ingress		Message Processor	TCP/8443	TLS (Apigee-generated, self-signed cert)	Processes incoming API requests.
Message Processor		Cassandra	TCP/9042 TCP/9142	mTLS	Sends data for persistence.
Message Processor		fluentd (analytics / logging)	TCP/20001	mTLS	Streams data to the data collection pod.
Cassandra		Cassandra	TCP/7001 TCP/7199	mTLS	Intra-node cluster communications.
Cassandra		Cassandra	TCP/7001	mTLS	Inter-region communications.
Synchronizer		Cassandra	TCP/9042 TCP/9142	mTLS	Sends data for persistence.
Prometheus (metrics)		Cassandra	TCP/7070 (HTTPS)	TLS	Scrapes metrics data from various services.
		MART	TCP/8843 (HTTPS)	TLS
		Message Processor	TCP/8843 (HTTPS)	TLS
		Synchronizer	TCP/8843 (HTTPS)	TLS
		UDCA	TCP/7070 (HTTPS)	TLS
Watcher		Ingress pods	TCP/8843	TLS	Polls to get deployment status.

External connections

To appropriately configure your network firewall, you should know the inbound and outbound ports used by hybrid to communicate with external services.

The following image shows the ports used for external communications with the hybrid runtime plane:

The following table describes the ports used for external communications with the hybrid runtime plane:

External Connections
Source		Destination	Protocol/Port(s)	Security Protocol	Description
Inbound Connections (exposed externally)
OPTIONAL: Apigee Services Only if not using Apigee Connect (recommended). See Two-way Connections below.		MART Istio Ingress	TCP/443	OAuth over TLS 1.2	Hybrid API calls from the management plane.
Client Apps		Default Istio Ingress	TCP/*	None/OAuth over TLS 1.2	API requests from external apps.
Outbound Connections
Message Processor		Backend services	TCP/* UDP/*	None/OAuth over TLS 1.2	Sends requests to customer-defined hosts.
Synchronizer		Apigee Services	TCP/443	OAuth over TLS 1.2	Fetches configuration data; connects to apigee.googleapis.com.
		Google Cloud			Connects to iamcredentials.googleapis.com for authorization.
UDCA (Analytics)		Apigee Services (UAP)	TCP/443	OAuth over TLS 1.2	Sends data to UAP in the management plane and to Google Cloud; connects to apigee.googleapis.com and storage.googleapis.com.
Apigee Connect		Apigee Services	TCP/443	TLS	Establishes the connection with the management plane; connects to apigeeconnect.googleapis.com.
Prometheus (metrics)		Google Cloud (Cloud Operations)	TCP/443	TLS	Sends data to Cloud Operations in the management plane; connects to monitoring.googleapis.com.
fluentd (logging)		Google Cloud (Cloud Operations)	TCP/443	TLS	Sends data to Cloud Operations in the management plane; connects to logging.googleapis.com
MART		Google Cloud	TCP/443	OAuth over TLS 1.2	Connects to iamcredentials.googleapis.com for authorization.
Message Processor		Distributed Trace back end	http or https	TLS (configurable)	(Optional) Communicates trace information to the Distributed Trace back end service. Configure the service and protocol in the TraceConfig API. The back end for Distributed Trace is usually Cloud Trace or Jaeger.
Two-way Connections
Apigee Connect		Apigee Services	TCP/443	TLS	Communicates management data between the managemennt plane and the Management API for runtime data (MART) in the runtime plane. Apigee Connect initiates the connection; connects to apigeeconnect.googleapis.com. Therefore, you do not need to configure your firewall for inbound connectivity.
* indicates that the port is configurable. Apigee recommends using port 443.

You should not allow external connections for specific IP addresses associated with *.googleapis.com. The IP addresses can change since the domain currently resolves to multiple addresses.