how to pass environment variable in kubectl deployment?

Question

I am setting up the kubernetes setup for django webapp.

I am passing environment variable while creating deployment as below

kubectl create -f deployment.yml -l key1=value1  

I am getting error as below

error: no objects passed to create 

Able to create the deployment successfully, If i remove the env variable -l key1=value1 while creating deployment.

deployment.yaml as below

#Deployment apiVersion: extensions/v1beta1 kind: Deployment metadata:   labels:     service: sigma-service  name: $key1 

What will be the reason for causing the above error while creating deployment?

Answer 1

I used envsubst (https://www.gnu.org/software/gettext/manual/html_node/envsubst-Invocation.html) for this. Create a deployment.yaml

apiVersion: apps/v1 kind: Deployment metadata:   name: $NAME   labels:     app: nginx spec:   replicas: 1   selector:     matchLabels:       app: nginx   template:     metadata:       labels:         app: nginx     spec:       containers:       - name: nginx         image: nginx:1.7.9         ports:         - containerPort: 80 

Then:

export NAME=my-test-nginx envsubst < deployment.yaml | kubectl apply -f - 

Not sure what OS are you using to run this. On macOS, envsubst installed like:

brew install gettext brew link --force gettext