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Ingress

An ingress

Kubernetes

OpenShift

Prerequisites

Having completed the following labs:

Having logged in using the developer account:

$ oc login -u developer -p developer https://api.crc.testing:6443     
Login successful.

You have one project on this server: "test"

Using project "test".

Make sure to use the test project.

$ oc project test
Already on project "test" on server "https://api.crc.testing:6443".

Deploy the backends we want to access through the Ingress

First we create a Deployment based on nginx Docker image

$ oc apply -f nginx-deployment.yaml 
deployment.apps/nginx-deployment created

And we expose with a ClusterIP service the nginx Pod

$ oc apply -f nginx-svc.yaml        
service/nginx-service created

Then we create a Deployment based on containous/whoami Docker image

$ oc apply -f whoami-deployment.yaml 
deployment.apps/whoami-deployment created

And we expose with a ClusterIP service the containous/whoami Pod as well

$ oc apply -f whoami-svc.yaml        
service/whoami-service created

Adding Ingress resourse to the Cluster

We still need to define the Ingress resource

$ oc create -f ingress.yaml
ingress.extensions/ingress created

Based on the routing defined into the ingress.yamlfile, we should get this output (you can use your browser too)

$ curl -H "Host: api.crc.testing" http://api.crc.testing/whoami 
Hostname: whoami-deployment-547545f65d-zjbgf
IP: 127.0.0.1
IP: 10.244.1.42
RemoteAddr: 10.244.1.41:38634
GET /whoami HTTP/1.1
Host: 192-168-26-11.nip.io
User-Agent: curl/7.45.0
Accept: */*
Accept-Encoding: gzip
X-Forwarded-For: 10.244.1.1
X-Forwarded-Host: 192-168-26-11.nip.io
X-Forwarded-Port: 80
X-Forwarded-Proto: http
X-Forwarded-Server: traefik-ingress-5f65985cc7-h4nsj
X-Real-Ip: 10.244.1.1

This was the whoami home page.

$ curl -H "Host: api.crc.testing" http://api.crc.testing/
<!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>

This was the nginx home page.

To discover how the ingress routing works, please refer to the ingress.yaml file.

Cleanup

Finally, clen up resources:

$ oc delete -f .
ingress.extensions "ingress" deleted
deployment.apps "nginx-deployment" deleted
service "nginx-service" deleted
deployment.apps "whoami-deployment" deleted
service "whoami-service" deleted