mirror of https://github.com/hashicorp/consul
84 lines
4.2 KiB
Markdown
84 lines
4.2 KiB
Markdown
---
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layout: docs
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page_title: Connect - Ingress Gateways
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sidebar_title: Ingress Gateways <sup> Beta </sup>
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description: >-
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An ingress gateway enables ingress traffic from services outside the Consul
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service mesh to services inside the Consul service mesh. This section details
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how to use Envoy and describes how you can plug in a gateway of your choice.
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---
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# Ingress Gateways <sup> Beta </sup>
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-> **1.8.0+:** This feature is available in Consul versions 1.8.0 and newer.
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Ingress gateways enable ingress traffic from services outside the Consul
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service mesh to services inside the Consul service mesh. An ingress gateway is
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a type of proxy and must be registered as a service in Consul, with the
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[kind](/api/agent/service#kind) set to "ingress-gateway". They are an
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entrypoint for outside traffic and allow you to define what services should be
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exposed and on what port. You configure an ingress gateway by defining a set of
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[listeners](/docs/agent/config-entries/ingress-gateway#listeners) that each map
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to a set of backing
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[services](/docs/agent/config-entries/ingress-gateway#services).
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Depending on the
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[protocol](/docs/agent/config-entries/ingress-gateway#protocol) defined for a
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listener, multiple services can be specified for a single listener. In this
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case, the ingress gateway relies on host/authority headers to decide the
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service that should receive the traffic.
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To enable easier service discovery, a new Consul [DNS
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subdomain](/docs/agent/dns#ingress-service-lookups) is provided, on
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`<service>.ingress.<domain>`.
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## Prerequisites
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Ingress gateways also require that your Consul datacenters are configured correctly:
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- You'll need to use Consul version 1.8.0.
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- Consul [Connect](/docs/agent/options#connect) must be enabled on the datacenter's Consul servers.
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- [gRPC](/docs/agent/options#grpc_port) must be enabled on all client agents.
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Currently, [Envoy](https://www.envoyproxy.io/) is the only proxy with ingress gateway capabilities in Consul.
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## Running and Using an Ingress Gateway
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You must complete the following steps to configure an ingress gateway to proxy traffic to services in the Consul service mesh:
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1. On a host with a Consul client agent, start an Envoy proxy using the [envoy
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subcommand](/docs/commands/connect/envoy), specifying the `ingress` gateway
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type:
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```shell
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$ consul connect envoy -gateway=ingress -register -service ingress-service \
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-address '{{ GetInterfaceIP "eth0" }}:8888'
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```
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2. Create and apply an `ingress-gateway` [configuration entry](/docs/agent/config-entries/ingress-gateway) that defines
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a set of listeners that expose the desired backing services. The config entry can be applied via the
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[CLI](/docs/commands/config/write) or [API](/api/config#apply-configuration).
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3. Ensure that [Consul intentions](/docs/commands/intention) are setup to allow connections from the ingress gateway to the backing services.
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4. **Optionally** use the `<service>.ingress.<domain>` [DNS subdomain](/docs/agent/dns#ingress-service-lookups) to discover the ingress
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gateways for a service.
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## Ingress Gateway Configuration
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Ingress gateways are configured in service definitions and registered with Consul like other services, with two exceptions.
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The first is that the [kind](/api/agent/service#kind) must be "ingress-gateway". Second,
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the ingress gateway service definition may contain a `Proxy.Config` entry just like a
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Connect proxy service, to define opaque configuration parameters useful for the actual proxy software.
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For Envoy there are some supported [gateway options](/docs/connect/proxies/envoy#gateway-options) as well as
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[escape-hatch overrides](/docs/connect/proxies/envoy#escape-hatch-overrides).
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-> **Note:** If ACLs are enabled, a token granting `service:write` for the gateway's service name
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and `service:read` for all services in the datacenter. These permissions authorize the token to route
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communications for other Connect services.
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~> [Configuration entries](/docs/agent/config-entries) are global in scope. A configuration entry for a gateway name applies
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across all federated Consul datacenters. If ingress gateways in different Consul datacenters need to route to different
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sets of services within their datacenter then the ingress gateways **must** be registered with different names.
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