@ -6,3 +6,202 @@ description: Configuring Ingress Gateways on Kubernetes
---
# Ingress Gateways on Kubernetes
-> 1.8.0+: This feature is available in Consul versions 1.8.0 and higher
~> This topic requires familiarity with [Ingress Gateways](/docs/connect/ingress-gateway).
This page describes how to enable external access to Connect service mesh services running inside Kubernetes using Consul ingress gateways.
See [Ingress Gateways](/docs/connect/ingress-gateway) for more information on use-cases and how it works.
Adding an ingress gateway is a multi-step process that consists of the following steps:
* Setting the helm chart configuration
* Deploying the helm chart
* Configuring the gateway
* Defining an Intention (if ACLs are enabled)
* Deploying your application to Kubernetes
* Connecting to your application
## Setting the helm chart configuration
When deploying the helm chart you must provide helm with a custom yaml file that contains your environment configuration.
```yaml
global:
name: consul
connectInject:
enabled: true
ingressGateways:
enabled: true
gateways:
- name: ingress-gateway
service:
type: LoadBalancer
```
~> *Note:* this will create a public unathenticated LoadBalancer in your cluster, please take appropriate security considerations.
The yaml snippet is the launching point for a valid configuration that must be supplied when installing using the [official consul-helm chart](https://hub.helm.sh/charts/hashicorp/consul).
Information on additional options can be found in the [Helm reference](/docs/k8s/helm). Configuration options for ingress gateways reside under the [ingressGateways](/docs/k8s/helm#v-ingressgateways) entry.
The gateways stanza is where you will define and configure the set of ingress gateways you want deployed to your environment.
The only required field for each entry is `name`, though entries may contain any of the fields found in the `defaults` stanza.
Values in this section override the values from the defaults stanza for the given ingress gateway with one exception:
the annotations from the defaults stanza will be *appended* to any user-defined annotations defined in the gateways stanza rather than being overridden.
Please refer to the ingress gateway configuration [documentation](/docs/k8s/helm#v-ingressgateways-defaults) for a detailed explanation of each option.
-> *Note*: Make sure any ports that will be used as listeners in the ingress gateway's Consul config entry are included
in the `ports` object for each gateway. By default ports 8080 and 8443 are exposed for traffic.
## Deploying the helm chart
Ensure you have the latest consul-helm chart and install Consul via helm using the following
[guide](/docs/k8s/installation/overview#installing-consul) while being sure to provide the yaml configuration
as previously discussed.
## Configuring the gateway
Now that Consul has been installed with ingress gateways enabled, you must add the corresponding configuration to Consul. This requires you to use the Consul CLI.
Configuring the ingress gateway requires:
* Accessing the Consul server
* Submitting an Ingress Gateway configuration entry to Consul
### Accessing the Consul server
You can access the Consul server directly from your host via `kubectl port-forward`, this is helpful for interacting with the Consul UI locally as well as validating connectivity of the application.
```shell-session
$ kubectl port-forward consul-server-0 8500 &
```
-> If TLS is enabled use port 8501
-> Download the latest Consul binary from [Downloads](/downloads.html).
### Submitting an Ingress Gateway configuration entry
Now that you have access to a Consul server through the forwarded port and you have the Consul CLI configured locally, you are able to submit an ingress gateway configuration entry.
Here is an ingress gateway [configuration](https://www.consul.io/docs/agent/config-entries/ingress-gateway).
```hcl
Kind = "ingress-gateway"
Name = "ingress-gateway"
Listeners = [
{
Port = 8080
Protocol = "http"
Services = [
{
Name = "static-server"
}
]
}
]
```
Submit the ingress gateway configuration with the Consul CLI using this command.
```shell-session
$ consul config write ingress-gateway.hcl
```
You can confirm the ingress gateways have been configured as expected by viewing the ingress-gateway service instances
in the Consul UI: [http://localhost:8500/ui/dc1/services/ingress-gateway/](http://localhost:8500/ui/dc1/services/ingress-gateway/).
If TLS is enabled, use [https://localhost:8501/ui/dc1/services/ingress-gateway/](https://localhost:8501/ui/dc1/services/ingress-gateway/).
## Defining an Intention
If ACLs are enabled, you must define an [intention](/docs/connect/intentions) to allow the ingress gateway to access the upstream services defined in the config entry.
To create an intention that allows the ingress gateway to route to the service `static-server`, run:
```shell-session
$ consul intention create ingress-gateway static-server
```
For detailed instructions on how to configure zero-trust networking with intentions please refer to this [guide](https://learn.hashicorp.com/consul/gs-consul-service-mesh/network-security-with-consul-service-mesh).
## Deploying your application to Kubernetes
Now you will deploy a sample application which echoes “hello world”
```yaml
apiVersion: v1
kind: ServiceAccount
metadata:
name: static-server
---
apiVersion: v1
kind: Pod
metadata:
name: static-server
annotations:
'consul.hashicorp.com/connect-inject': 'true'
spec:
containers:
# This name will be the service name in Consul.
- name: static-server
image: hashicorp/http-echo:latest
args:
- -text="hello world"
- -listen=:8080
ports:
- containerPort: 8080
name: http
# If ACLs are enabled, the serviceAccountName must match the Consul service name.
serviceAccountName: static-server
```
```shell-session
$ kubectl apply -f static-server.yaml
```
## Connecting to your application
You can validate the service is running and registered in the Consul UI by navigating to
-> If TLS is enabled, use [https://localhost:8501/ui/dc1/services/static-server/instances](https://localhost:8501/ui/dc1/services/static-server/instances)
You can also validate the connectivity of the application from the ingress gateway using `curl`:
Kyle Schochenmaier
4 years ago
committed by