matthewpalmer

kind: Deployment
apiVersion: extensions/v1beta1
metadata:
  name: nginx-deployment
spec:
  # A deployment's specification really only 
  # has a few useful options
  
  # 1. How many copies of each pod do we want?
  replicas: 3

matthewpalmer

kind: Service 
apiVersion: v1 
metadata:
  name: hostname-service 
spec:
  # Expose the service on a static port on each node
  # so that we can access the service from outside the cluster 
  type: NodePort

  # When the node receives a request on the static port (30163)

matthewpalmer

kind: Pod 
apiVersion: v1 
metadata:
  name: pod-env-var 
spec:
  containers:
    - name: env-var-configmap
      image: nginx:1.7.9 
      envFrom:
        - configMapRef:

matthewpalmer

kind: Pod 
apiVersion: v1 
metadata:
  name: pod-using-configmap 

spec:
  # Add the ConfigMap as a volume to the Pod
  volumes:
    # `name` here must match the name
    # specified in the volume mount

matthewpalmer

kind: ConfigMap 
apiVersion: v1 
metadata:
  name: example-configmap 
data:
  # Configuration values can be set as key-value properties
  database: mongodb
  database_uri: mongodb://localhost:27017
  
  # Or set as complete file contents (even JSON!)

matthewpalmer

# Create a pod that reads and writes to the
# NFS server via an NFS volume.

kind: Pod
apiVersion: v1
metadata:
  name: pod-using-nfs
spec:
  # Add the server as an NFS volume for the pod
  volumes:

matthewpalmer

# Note - an NFS server isn't really a Kubernetes
# concept. We're just creating it in Kubernetes
# for illustration and convenience. In practice,
# it might be run in some other system.

# Create a service to expose the NFS server
# to pods inside the cluster.

kind: Service
apiVersion: v1

matthewpalmer

# Create a pod that reads and writes to the
# NFS server via an NFS volume.

kind: Pod
apiVersion: v1
metadata:
  name: pod-using-nfs
spec:
  # Add the server as an NFS volume for the pod
  volumes:

matthewpalmer

nfs ⟩ kubectl exec -it pod-using-nfs sh
/ # cat /var/nfs/dates.txt
Mon Oct 22 00:47:36 UTC 2018
Mon Oct 22 00:47:41 UTC 2018
Mon Oct 22 00:47:46 UTC 2018



nfs ⟩ kubectl exec -it nfs-server-pod sh
# cat /exports/dates.txt

matthewpalmer

# Note - an NFS server isn't really a Kubernetes
# concept. We're just creating it in Kubernetes
# for illustration and convenience. In practice,
# it might be run in some other system.

# Create a service to expose the NFS server
# to pods inside the cluster.

kind: Service
apiVersion: v1