Limited Internet Access

Kubernetes pulls images from the network according to the ImagePullPolicy which is set to IfNotPresent for the Kloudspot application containers.

The rule works as follows:

• If the image tag is not ’latest’ then the image is only pulled if it is not already present locally.
• If the image is ’latest’ then the image will always be pulled.

So don’t set a tag to ’latest’ for an offline installation!

Docker Registry Access needed:

By default, the following URLs need to be accessible in order allow images to be loaded. If this is not possible, then you will have to sideload the images.

• https://docker.io
• https://docker.kloudspot.com
• https://registry.k8s.io

Side Loading Images

The easiest way to sideload images is as follows:

• Set up a system with all of the required images and run the following command:

microk8s images export-local > images.tgz

• Copy the file images.tar to the off-line system.

• Then on the offline system, run the following command:

microk8s images import < images.tgz

Click here for more details

Once, the images are loaded, you can limit garbage collection by running the following script to add a ’label’ to the images.

/opt/kloudspot/bin/label-images