Network & Firewall
In this section you will find a summary about the recommended network and firewall settings for Kong.
Kong listens on several ports that must allow external traffic and are by default:
8000for proxying. This is where Kong listens for HTTP traffic. Be sure to change it to
80once you go to production. See proxy_listen.
8443for proxying HTTPS traffic. Be sure to change it to
443once you go to production. See proxy_listen_ssl.
7946which Kong uses for inter-nodes communication. Both UDP and TCP traffic should be allowed on it. See cluster_listen.
Additionally, those ports are used internally and should be firewalled in production usage:
8001provides Kong's Admin API that you can use to operate Kong. See admin_api_listen.
7373used by Kong to communicate with the local clustering agent. See cluster_listen_rpc.
Below are the recommended firewall settings:
- The upstream APIs behind Kong will be available on proxy_listen and proxy_listen_ssl. Configure these ports accordingly to the access level you wish to grant to the upstream APIs.
- Protect admin_api_listen, and only allow trusted sources that can access the Admin API.
- Allow traffic on cluster_listen port only between other Kong nodes. This port is used for infra-cluster communications.
Kong assumes a flat network topology in multi-datacenter setups. If you have a multi-datacenter setup, Kong nodes between the datacentes should communicate over a VPN connection.
Kong will try to auto-detect the node's first, non-loopback, IPv4 address and advertise this address to other Kong nodes. Sometimes this is not enough and the IP address needs to be manually set, you can do that by changing the
advertise property in the cluster configuration.