sample Nginx configuration on Kubernetes using ConfigMap to configure nginx.

nginx_deployment.yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: nginx-conf
data:
  nginx.conf: |
    user nginx;
    worker_processes  3;
    error_log  /var/log/nginx/error.log;
    events {
      worker_connections  10240;
    }
    http {
      log_format  main
              'remote_addr:$remote_addr\t'
              'time_local:$time_local\t'
              'method:$request_method\t'
              'uri:$request_uri\t'
              'host:$host\t'
              'status:$status\t'
              'bytes_sent:$body_bytes_sent\t'
              'referer:$http_referer\t'
              'useragent:$http_user_agent\t'
              'forwardedfor:$http_x_forwarded_for\t'
              'request_time:$request_time';

      access_log	/var/log/nginx/access.log main;

      server {
          listen       80;
          server_name  _;

          location / {
              root   html;
              index  index.html index.htm;
          }
      }
      include /etc/nginx/virtualhost/virtualhost.conf;
    }
  virtualhost.conf: |
    upstream app {
      server localhost:8080;
      keepalive 1024;
    }

    server {
      listen 80 default_server;
      root /usr/local/app;

      access_log /var/log/nginx/app.access_log main;
      error_log /var/log/nginx/app.error_log;

      location / {
        proxy_pass http://app/;
        proxy_http_version 1.1;
      }
    }

---
apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: nginx
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx
        ports:
        - containerPort: 80
        volumeMounts:
        - mountPath: /etc/nginx # mount nginx-conf volumn to /etc/nginx
          readOnly: true
          name: nginx-conf
        - mountPath: /var/log/nginx
          name: log
      volumes:
      - name: nginx-conf
        configMap:
          name: nginx-conf # place ConfigMap `nginx-conf` on /etc/nginx
          items:
            - key: nginx.conf
              path: nginx.conf
            - key: virtualhost.conf
              path: virtualhost/virtualhost.conf # dig directory
      - name: log
        emptyDir: {}

---
apiVersion: v1
kind: Service
metadata:
  name: nginx
spec:
  type: LoadBalancer
  ports:
  - port: 80
    targetPort: 80
  selector:
    app: nginx

Not able to mount under /etc/nginx. Pod goes into CrashLoopBackOff. Permissions issue?

@Nj-kol its mostly the permission issue but you check the logs of your nginx pod for more informations.

~$ kubectl get pods
~$ kubectl logs {POD_NAME}
or
~$ kubectl describe pod {POD_NAME}

@vacar Thanks for your reply, I was able to resolve the issue. The problem was not actually the mount, there was some config issue in nginx.conf which prevented nginx from starting up. Because by default, nginx write log under /var/log/nginx and not standard out, kubectl logs did not produce any output, hence rendering it very difficult to debug. Once I change nginx.conf to debug to standard out, things became clear

i have some issue, all files under /etc/nginx is erased