Sheep It - Sample Greeter

This is a minimalistic Node.js app to test Sheep It deployments. The only thing that app does is responding to GET / with a configurable name.

Running the app

Running the app locally:

npm start
curl http://localhost:8080
# Hello, stranger! My name is Gallus Anonymus.

Configuring the name:

GREETER_NAME="Local John" npm start
curl http://localhost:8080
# Hello, stranger! My name is Local John.

Working with TreeScale

We recommend using private Docker Registry for testing, e.g. TreeScale.

Sing up at TreeScale. Remember your username.

We need to create a secret in Kuibernetes for registry authentication.

Log in to TreeScale:

docker login repo.treescale.com

This should update your credentials, which usually are at:

cat ~/.docker/config.json

Upload your local credentials to Kubernetes. Update the location of your credentials file if necessary. Mind, that in this example environments are represented by Kubernetes namespaces; in other words, you'll need to do that for a number of namespaces, e.g. dev, test and prod.

kubectl create secret generic regcred \
    --from-file=.dockerconfigjson=$(realpath ~/.docker/config.json) \
    --type=kubernetes.io/dockerconfigjson \
    --namespace=dev

The $(realpath ~/.docker/config.json) is due to the ~ expanding error that sometimes occurs.

For more information on storing Registry credentials in Kubernetes, see the offical Kubernetes documentation.

Building the app

Building a Docker image:

docker build -t repo.treescale.com/<your username>/sheepit-sample-greeter:0.0.1 .

Running the image locally:

docker run -p 8081:8080 -d -e GREETER_NAME="Containerized John" repo.treescale.com/<your username>/sheepit-sample-greeter:0.0.1
curl http://localhost:8081
# Hello, stranger! My name is Containerized John.

Publishing the image:

docker login
docker push repo.treescale.com/<your username>/sheepit-sample-greeter:0.0.1