Nginx

Nginx with Ondat

Nginx is a popular web server that can be used as a reverse proxy, load balancer or even as a Kubernetes ingress controller.

Before you start, ensure you have Ondat installed and ready on a Kubernetes cluster. See our guide on how to install Ondat on Kubernetes for more information.

Deploying Nginx on Kubernetes

You can find the latest files in the Ondat use cases repostiory

git clone https://github.com/storageos/use-cases.git storageos-usecases

StatefulSet definition

apiVersion: apps/v1
kind: StatefulSet
metadata:
 name: nginx
spec:
  serviceName: nginx
    spec:
      serviceAccountName: nginx
      containers:
      - name: nginx
        image: nginx
        ports:
        - containerPort: 80
        volumeMounts:
        - name: nginx-data
          mountPath: /usr/share/nginx/html
          subPath: html
        - name: nginx-config
          mountPath: /etc/nginx/conf.d
      volumes:
      - name: nginx-config
        configMap:
          name: nginx
    volumeClaimTemplates:
    - metadata:
      name: nginx-data
      spec:
        accessModes: ["ReadWriteOnce"]
        storageClassName: "fast" # Ondat storageClass 
          resources:
            requests:
              storage: 5Gi

This excerpt is from the StatefulSet definition. This file contains the VolumeClaim template that will dynamically provision storage, using the Ondat storage class. Dynamic provisioning occurs as a volumeMount has been declared with the same name as a VolumeClaim.

Move into the Nginx examples folder and create the objects
```
cd storageos-usecases
kubectl create -f ./nginx
```

Confirm Nginx is up and running.

$ kubectl get pods -w -l app=nginx
NAME        READY    STATUS    RESTARTS    AGE
nginx-0     1/1      Running    0          1m

Connect to the nginx pod and write a file to /usr/share/nginx/html that Nginx will serve.

$ kubectl exec nginx-0 -it -- bash
root@nginx-0:/# echo Hello world! > /usr/share/nginx/html/greetings.txt

Connect to the Busybox pod and connect to the Nginx server through the service and retrieve the directory index from Nginx.

$ kubectl exec -it busybox -- /bin/sh
/ # wget -q -O- nginx
<html>
<head><title>Index of /</title></head>
<body>
<h1>Index of /</h1><hr><pre><a href="../">../</a>
<a href="greetings.txt">greetings.txt</a>
27-Feb-2019 12:04                  13
</pre><hr></body>
</html>

Retrieve and display the contents of the greetings.txt file
```
/ # wget -q -O- nginx/greetings.txt
Hello world!
```

Configuration

If you need custom startup options, you can edit the ConfigMap file 15-nginx-configmap.yaml with your desired Nginx configuration settings.