Open ports to incoming traffic

When installing MKE on a host, you need to open specific ports to incoming traffic. Each port listens for incoming traffic from a particular set of hosts, known as the port scope.

MKE uses the following scopes:

Scope

Description

External

Traffic arrives from outside the cluster through end-user interaction.

Internal

Traffic arrives from other hosts in the same cluster.

Self

Traffic arrives to that port only from processes on the same host.


Open the following ports for incoming traffic on each host type:

Hosts

Port

Scope

Purpose

Managers, workers

TCP 179

Internal

BGP peers, used for Kubernetes networking

Managers

TCP 443 (configurable)

External, internal

MKE web UI and API

Managers

TCP 2376 (configurable)

Internal

Docker swarm manager, used for backwards compatibility

Managers

TCP 2377 (configurable)

Internal

Control communication between swarm nodes

Managers, workers

UDP 4789

Internal

Overlay networking

Managers

TCP 6443 (configurable)

External, internal

Kubernetes API server endpoint

Managers, workers

TCP 6444

Self

Kubernetes API reverse proxy

Managers, workers

TCP, UDP 7946

Internal

Gossip-based clustering

Managers, workers

TCP 9099

Self

Calico health check

Managers, workers

TCP 10250

Internal

Kubelet

Managers, workers

TCP 12376

Internal

TLS authentication proxy that provides access to MCR

Managers, workers

TCP 12378

Self

etcd reverse proxy

Managers

TCP 12379

Internal

etcd Control API

Managers

TCP 12380

Internal

etcd Peer API

Managers

TCP 12381

Internal

MKE cluster certificate authority

Managers

TCP 12382

Internal

MKE client certificate authority

Managers

TCP 12383

Internal

Authentication storage back end

Managers

TCP 12384

Internal

Authentication storage back end for replication across managers

Managers

TCP 12385

Internal

Authentication service API

Managers

TCP 12386

Internal

Authentication worker

Managers

TCP 12387

Internal

Prometheus server

Managers

TCP 12388

Internal

Kubernetes API server

Managers, workers

TCP 12389

Self

Hardware Discovery API