Fix Helm chart default configuration

[kevin85421]

Why are these changes needed?

There are 3 problems in current helm chart default configurations.

• [Q1] There is a mismatch between labels in ray-head pod and selector in ray-head ClusterIP service. See [Bug] The mismatched labels configured in RayCluster Helm chart #495 for more details.

  • [Solution]: I updated the value of nameOverride from ray to kuberay as mentioned by @jeethridge.

• [Q2] When I solved Q1, I found dashboard could not be launched successfully. The root cause is that dashboard_agent would round down the CPU request config (200m) to 0.

  • [Solution]: Increase CPU request from 200m to 1.

• [Q3] After I solved Q2, the dashboard still could not be rendered on my browser. The root cause is that the image rayproject/ray:latest points to a very old version. Thank @hckuo for pointing this out!

  • [Solution]: Updated the image

Related issue number

#495

Checks

# Step1: Install operator
kubectl create -k "github.com/ray-project/kuberay/ray-operator/config/crd?ref=v0.3.0&timeout=90s"
helm install kuberay-operator --namespace ray-system --create-namespace $(curl -s https://api.github.com/repos/ray-project/kuberay/releases/latest | grep '"browser_download_url":' | sort | grep -om1 'https.*helm-chart-kuberay-operator.*tgz')

# Step2: Install ray-cluster
cd helm-chart/ray-cluster
helm install ray-cluster --namespace ray-system --create-namespace .

# Step3: port-forwarding
kubectl port-forward -n ray-system services/ray-cluster-kuberay-head-svc 8265:8265 

# Step4: Type 127.0.0.1:8265 in your browser to check dashboard. I added a screenshot for dashboard below.

# Step5: Submit a job to your ray cluster. The result is as shown in the following screenshot.
ray job submit --address http://localhost:8265 -- python -c "import ray; ray.init(); print(ray.cluster_resources())"

• I've made sure the tests are passing.
• Testing Strategy
  • Unit tests
  • Manual tests
  • This PR is not tested :(

[kevin85421]

cc @DmitriGekhtman

[DmitriGekhtman]

This is great. Thanks for fixing this!