prepull-daemonset

prepull-daemonset

a daemonset to prepull images so they are cached

Installing the Chart

To install the chart with the release name my-release at version 0.0.4:

helm repo add rstudio https://helm.rstudio.com
helm install my-release rstudio/prepull-daemonset --version=0.0.4

Use

Create a values.yaml file somewhere that lists the images you'd like to be pre-pulled (use the values.yaml file in this repo for format):

images:
  - name: my-first-image
    image: some-id.dkr.ecr.us-east-1.amazonaws.com/my-ecr-repo:latest
  - name: my-second-image
    image: some-id.dkr.ecr.us-east-1.amazonaws.com/my-other-repo:latest
  - name: my-third-public-image
    image: ubuntu:bionic

Pull Again

To run the pre-pull again (i.e. to pull new images with the same tag, to ensure node caches^† are fresh), there are a few options:

# by default, every upgrade is randomized / does a rollout (`--set randomize=false` to disable this behavior)
helm upgrade install prepull-daemonset rstudio/prepull-daemonset

# or use kubectl
kubectl rollout restart daemonset/prepull-daemonset

^† Kubernetes Nodes (specifically, the kubelet service) periodically remove images from the node's cache to free up disk space, especially if an image is not in use and has not been used lately

Values

Key	Type	Default	Description
images[0].image	string	"ubuntu:bionic"
images[0].name	string	"ubuntu-bionic"
randomize	bool	true
updateStrategy	object	{}

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Autogenerated from chart metadata using helm-docs v1.13.1