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

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

Only mount specific file instead of entire directory.

          volumeMounts:
            - name: nginx-conf-volume
              mountPath: /etc/nginx/nginx.conf
              subPath: nginx.conf
              readOnly: true

apiVersion: apps/v1beta1 deployment version should be changed to apiVersion: apps/v1

I need help to optimize the Nginx

1. What should be the worker_Processes configuration? I thought it should be a number per core. So for example, if we are giving the 1000m CPU ( request ) to the POD, what should be worker_processes in this case - I think 1?
2. Similarly what should be the memory request I should give that to Pod?
3. What should be a number of worker_connections?

Thanks

Can we provide the server configuration wihtout having the config map?
I don't want to use config map, I want to apply the setting configuration in the deployment directly. Is it possible?

Hello,

I have created config map to mount nginx.conf inside the nginx contianer.
But I am seeing the nginx default page inside pod not the one I have mounted via configmap.
PS: I am trying this on OpenShift 4.6 cluster.

My files are:

Config map

apiVersion: v1
kind: ConfigMap
metadata:
  name: nginx-conf
  namespace: nginx-ingress
data:
  nginx.conf: |-
    user nginx;
    worker_processes  10;
    events {
      worker_connections  10240;
    }
    http {
      server {
          listen       80;
          server_name  localhost;
          location / {
            root   /usr/share/nginx/html; #Change this line
            index  index.html index.htm;
        }
      }
    }

Deployment

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  namespace: nginx-ingress
spec:
  selector:
    matchLabels:
      app: nginx
  replicas: 1
  template:
    metadata:
      labels:
        app: nginx
    spec:
      nodeSelector:
        compute1: worker1
      volumes:
      - name: nginx-conf
        configMap:
          name: nginx-conf
          items:
            - key: nginx.conf
              path: nginx.conf
      containers:
      - name: nginx-alpine-perl
        image: docker.io/library/nginx@sha256:51212c2cc0070084b2061106d5711df55e8aedfc6091c6f96fabeff3e083f355
        ports:
        - containerPort: 80
        securityContext:
          allowPrivilegeEscalation: false
          #runAsUser: 0
        volumeMounts:
            - name: nginx-conf
              mountPath: /etc/nginx
              #subPath: nginx.conf
              readOnly: true

I tried it with specific path as well like: /etc/nginx/nginx.conf but it doesn't create container.

Any help would be appreciated?

Do i need to install nginx (using yum etc) or configmap will create nginx files automatically.