Let's say I have a deployment that looks something like this:
apiVersion: v1
kind: Deployment
metadata:
name: myapp-deployment
spec:
replicas: 3
template:
kind: Pod
metadata: myapp-pod
labels:
apptype: front-end
containers:
- name: nginx
containers: <--what is supposed to go here?-->How do I properly build a container using an existing Dockerfile without having to push a build image up to Docker hub?
https://kubernetes.io/docs/concepts/workloads/controllers/deployment/#creating-a-deployment check this out.
Make sure you give a good read at the documentation :)
Kubernetes can't build images. You all but are required to use an image registry. This isn't necessarily Docker Hub: the various public-cloud providers (AWS, Google, Azure) all have their own registry offerings, there are some third-party ones out there, or you can run your own.
If you're using a cloud-hosted Kubernetes installation (EKS, GKE, ...) the "right" way to do this is to push your built image to the corresponding image registry (ECR, GCR, ...) before you run it.
<!-- language: lang-sh -->docker build -t gcr.io/my/image:20201116 .
docker push gcr.io/my/image:20201116containers:
- name: anything
image: gcr.io/my/image:20201116There are some limited exceptions to this in a very local development environment. For example, if you're using Minikube as a local Kubernetes installation, you can point docker commands at it, so that docker build builds an image inside the Kubernetes context.
eval $(minikube docker-env)
docker build -t my-image:20201116 .containers:
- name: anything
image: my-image:20201116 # matches `docker build -t` option
imagePullPolicy: Never # since you manually built it inside the minikube Docker