Monthly Archives: August 2024

Loading container images into Kubernetes containerd

Do you need to run containers whose images are not available in a container registry? Here’s how…

Make sure you have the image available as a tar file. Here’s how to save one from a machine with docker:

docker save repository/image --output ./image.tar

Copy the tarfile to the target machine and run this command to load image into containerd:

sudo ctr -n k8s.io images import image.tar

To use this image in a Kubernetes deployment, make sure its marked as never pull:

kind: Deployment
apiVersion: apps/v1
metadata:
  name: my-app
  labels:
    app: my-app

spec:
  replicas: 1
  selector:
    matchLabels:
      app: my-app
  template:
    metadata:
      labels:
        app: my-app
    spec:
      containers:
        - name: my-app
          image: xxxxx/my-app
          imagePullPolicy: Never