K
Q

Add nginx.conf to Kubernetes cluster

2/6/2017

How can I pass the nginx.conf configuration file to an nginx instance running inside a Kubernetes cluster?

-- xechelonx
kubernetes
nginx

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2 Answers

2/6/2017

You can create a ConfigMap object and then mount the values as files where you need them:

apiVersion: v1
kind: ConfigMap
metadata:
  name: nginx-config
data:
  nginx.conf: |
    your config
    comes here
    like this
  other.conf: |
    second file
    contents

And in you pod spec:

spec:
  containers:
    - name: nginx
      image: nginx
      volumeMounts:
        - name: nginx-config
          mountPath: /etc/nginx/nginx.conf
          subPath: nginx.conf
        - name: nginx-config
          mountPath: /etc/nginx/other.conf
          subPath: other.conf
  volumes:
    - name: nginx-config
      configMap:
        name: nginx-config

(Take note of the duplication of the filename in mountPath and using the exact same subPath; same as bind mounting files.)

For more information about ConfigMap see: https://kubernetes.io/docs/user-guide/configmap/

Note: A container using a ConfigMap as a subPath volume will not receive ConfigMap updates.

-- Janos Lenart
Source: StackOverflow
6/21/2018

I haven't found a good way to escape the nginx configuration contents in the ConfigMap. The best recourse for me was to use ConfigMap creation using files

Save the following as ./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;
    #tcp_nopush     on;

    keepalive_timeout  65;

    #gzip  on;

    include /etc/nginx/conf.d/*.conf;
}

Now create the configMap kubectl create configmap confnginx --from-file=./data/nginx.conf

Save the following deployment and pod yaml as nginx.yaml

apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
kind: Deployment
metadata:
  name: nginx
  labels:
    app: nginx     
spec:
  selector:
    matchLabels:
      app: nginx
  replicas: 1 # tells deployment to run 2 pods matching the template
  template: # create pods using pod definition in this template
    metadata:
      # unlike pod-nginx.yaml, the name is not included in the meta data as a unique name is
      # generated from the deployment name
      labels:
        app: nginx     
    spec:
      containers:
        - name: nginx
          image: nginx:alpine
          ports:
          - containerPort: 80        
          volumeMounts:
            - name: nginx-config
              mountPath: /etc/nginx/nginx.conf
              subPath: nginx.conf
      volumes:
        - name: nginx-config
          configMap:
            name: confnginx

Now create it in k8 kubectl apply -f nginx.yaml

-- ice.nicer
Source: StackOverflow