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consideRatio and k8s-ci-robot [stable/dask] Tolerations for worker deployment (#9529)
* Add worker pod tolerations

Signed-off-by: Erik Sundell <>

* Bump chart version

Signed-off-by: Erik Sundell <>
Latest commit de9118b Dec 13, 2018
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templates [stable/dask] Tolerations for worker deployment (#9529) Dec 13, 2018
Chart.yaml [stable/dask] Tolerations for worker deployment (#9529) Dec 13, 2018 bump dask to 1.0.0 (#9926) Dec 12, 2018
values.yaml bump dask to 1.0.0 (#9926) Dec 12, 2018

Dask Helm Chart

Dask allows distributed computation in Python.

Chart Details

This chart will deploy the following:

  • 1 x Dask scheduler with port 8786 (scheduler) and 80 (Web UI) exposed on an external LoadBalancer
  • 3 x Dask workers that connect to the scheduler
  • 1 x Jupyter notebook (optional) with port 80 exposed on an external LoadBalancer
  • All using Kubernetes Deployments

Installing the Chart

To install the chart with the release name my-release:

$ helm install --name my-release stable/dask


The following tables list the configurable parameters of the Dask chart and their default values.

Dask scheduler

Parameter Description Default Dask scheduler name scheduler
scheduler.image Container image name daskdev/dask
scheduler.imageTag Container image tag 1.0.0
scheduler.replicas k8s deployment replicas 1
scheduler.resources Container resources {}

Dask webUI

Parameter Description Default Dask webui name webui
webUI.servicePort k8s service port 80

Dask worker

Parameter Description Default Dask worker name worker
worker.image Container image name daskdev/dask
worker.imageTag Container image tag 1.0.0
worker.replicas k8s hpa and deployment replicas 3
worker.resources Container resources {}



Parameter Description Default Jupyter name jupyter
jupyter.enabled Include optional Jupyter server true
jupyter.image Container image name daskdev/dask-notebook
jupyter.imageTag Container image tag 1.0.0
jupyter.replicas k8s deployment replicas 1
jupyter.servicePort k8s service port 80
jupyter.resources Container resources {}

Specify each parameter using the --set key=value[,key=value] argument to helm install.

Alternatively, a YAML file that specifies the values for the parameters can be provided while installing the chart. For example,

$ helm install --name my-release -f values.yaml stable/dask

Tip: You can use the default values.yaml

Customizing Python Environment

The default daskdev/dask images have a standard Miniconda installation along with some common packages like NumPy and Pandas. You can install custom packages with either Conda or Pip using optional environment variables. This happens when your container starts up. Consider the following config.yaml file as an example:

    -  EXTRA_PIP_PACKAGES: s3fs git+ --upgrade
    -  EXTRA_CONDA_PACKAGES: scipy matplotlib -c conda-forge

    -  EXTRA_PIP_PACKAGES: s3fs git+ --upgrade
    -  EXTRA_CONDA_PACKAGES: scipy -c conda-forge

Note that the Jupyter and Dask worker environments should have matching software environments, at least where a user is likely to distribute that functionality.