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Developer Guide

PyTorch-operator is currently at v1.

Building the operator

cd ${GOPATH}/src/github.com/kubeflow
git clone git@github.com:kubeflow/pytorch-operator.git

Resolve dependencies (if you don't have dep install, check how to do it here)

Install dependencies

dep ensure

Build it

go install github.com/kubeflow/pytorch-operator/cmd/pytorch-operator.v1

Running the Operator Locally

Running the operator locally (as opposed to deploying it on a K8s cluster) is convenient for debugging/development.

Run a Kubernetes cluster

First, you need to run a Kubernetes cluster locally. There are lots of choices:

local-up-cluster.sh runs a single-node Kubernetes cluster locally, but Minikube runs a single-node Kubernetes cluster inside a VM. It is all compilable with the controller, but the Kubernetes version should be 1.8 or above.

Notice: If you use local-up-cluster.sh, please make sure that the kube-dns is up, see kubernetes/kubernetes#47739 for more details.

Configure KUBECONFIG and KUBEFLOW_NAMESPACE

We can configure the operator to run locally using the configuration available in your kubeconfig to communicate with a K8s cluster. Set your environment:

export KUBECONFIG=$(echo ~/.kube/config)
export KUBEFLOW_NAMESPACE=$(your_namespace)
  • KUBEFLOW_NAMESPACE is used when deployed on Kubernetes, we use this variable to create other resources (e.g. the resource lock) internal in the same namespace. It is optional, use default namespace if not set.

Create the PyTorch Operator CRD

After the cluster is up, the PyTorch Operator CRD should be created on the cluster.

kubectl create -f ./manifests/crd.yaml

Run Operator

Now we are ready to run operator locally:

pytorch-operator.v1

To verify local operator is working, create an example job and you should see jobs created by it.

cd ./examples/mnist
docker build -f Dockerfile -t kubeflow/pytorch-dist-mnist-test:1.0 ./
kubectl create -f ./v1/pytorch_job_mnist_gloo.yaml

Go version

On ubuntu the default go package appears to be gccgo-go which has problems see issue golang-go package is also really old so install from golang tarballs instead.