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Internal
In Internal type Ingress, HAProxy pods are exposed via a ClusterIP type Kubernetes service named voyager-${ingress-name}. To enable this, apply the ingress.appscode.com/type: Internal annotation on a Ingress object. Unlike Kubernetes Service which operates at L4 level, this creates a cluster internal L7 proxy. An example use-case is proxy for ElasticSearch cluster to handle persistent connections, alleviating the ElasticSearch servers from having to deal w/ tons of connection creations.
How It Works
First, install Voyager operator in your cluster following the steps here.
Now, deploy test servers using this script script.
curl -fsSL https://raw.githubusercontent.com/appscode/voyager/v12.0.0/docs/examples/ingress/types/internal/deploy-servers.sh | bash
deployment "nginx" created
service "web" exposed
deployment "echoserver" created
service "rest" exposed
- Now, create an Ingress object running
kubectl apply -f https://raw.githubusercontent.com/appscode/voyager/v12.0.0/docs/examples/ingress/types/internal/ing.yaml
Please note the annotaiton on ingress:
annotations:
ingress.appscode.com/type: Internal
$ kubectl get pods,svc
NAME READY STATUS RESTARTS AGE
po/echoserver-566fcc4fdb-bw4xm 1/1 Running 0 1m
po/nginx-d5dc44cf7-brgd4 1/1 Running 0 1m
po/voyager-test-ingress-6859dc5ddd-9mmz2 1/1 Running 0 34s
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
svc/kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 7m
svc/rest ClusterIP 10.105.80.152 <none> 80/TCP 1m
svc/voyager-test-ingress ClusterIP 10.97.153.185 <none> 80/TCP 34s
svc/web ClusterIP 10.96.37.26 <none> 80/TCP 1m
$ minikube ip
192.168.99.100
- Now, ssh into the minikube vm and run the following commands from host:
$ minikube ssh
$ curl -vv 10.97.153.185 -H "Host: web.example.com"
> GET / HTTP/1.1
> Host: web.example.com
> User-Agent: curl/7.53.0
> Accept: */*
>
< HTTP/1.1 200 OK
< Server: nginx/1.13.8
< Date: Thu, 18 Jan 2018 06:58:29 GMT
< Content-Type: text/html
< Content-Length: 612
< Last-Modified: Tue, 26 Dec 2017 11:11:22 GMT
< ETag: "5a422e5a-264"
< Accept-Ranges: bytes
<
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
body {
width: 35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>
<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html>
$ curl -vv 10.97.153.185 -H "Host: app.example.com"
> GET / HTTP/1.1
> Host: app.example.com
> User-Agent: curl/7.53.0
> Accept: */*
>
< HTTP/1.1 200 OK
< Server: nginx/1.10.0
< Date: Thu, 18 Jan 2018 06:59:05 GMT
< Content-Type: text/plain
< Transfer-Encoding: chunked
<
CLIENT VALUES:
client_address=172.17.0.7
command=GET
real path=/
query=nil
request_version=1.1
request_uri=http://app.example.com:8080/
SERVER VALUES:
server_version=nginx: 1.10.0 - lua: 10001
HEADERS RECEIVED:
accept=*/*
connection=close
host=app.example.com
user-agent=curl/7.53.0
x-forwarded-for=10.0.2.15
BODY:
-no body in request-