Nginx as reverse proxy in Kubernetes

Although API gateways such as Kong exist, a simple reverse-proxy can be created using NGINX. Here is a sample manifest to do so in Kubernetes:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
        - name: nginx
          image: nginx
          volumeMounts:
            - mountPath: /etc/nginx/nginx.conf
              name: config
              subPath: nginx.conf
      volumes:
        - name: config
          configMap:
            name: config
---
apiVersion: v1
kind: Service
metadata:
  name: nginx
spec:
  ports:
    - port: 80
      nodePort: 30080
  selector:
    app: nginx
  type: NodePort
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: config
data:
  nginx.conf: |
    user  nginx;
    worker_processes  1;
    error_log  /var/log/nginx/error.log warn;
    pid        /var/run/nginx.pid;
    events {
      worker_connections  1024;
    }
    http {
      include       /etc/nginx/mime.types;
      default_type  application/octet-stream;
      log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                        '$status $body_bytes_sent "$http_referer" '
                        '"$http_user_agent" "$http_x_forwarded_for"';
      access_log  /var/log/nginx/access.log  main;
      sendfile        on;
      keepalive_timeout  65;
      server {
        listen       80;
        server_name  localhost;
        location /finances {
          proxy_pass http://my-service;
        }
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
          root   /usr/share/nginx/html;
        }
      }
    }

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