I am running Knative on a GKE cluster. The sample images provided on the Knative website work but when I switch to some other images, it stops working. Only 2 containers work out of 3 and route's ready state remains 'unknown' and Reason shows as 'RevisionMissing'.
I tried with multiple images, k8s.gcr.io/hpa-example is one of them.
Edit: The cluster has a two-node of configuration of type n1-standard-4 (4 vCPUs, 15 GB memory). I created this cluster using the GCP console with the latest version of kubernetes, and checking the Enable Istio checkbox. I used following commands to install the Knative:
kubectl apply --selector knative.dev/crd-install=true \
-f https://github.com/knative/serving/releases/download/v0.8.0/serving.yaml \
-f https://github.com/knative/eventing/releases/download/v0.8.0/release.yaml \
-f https://github.com/knative/serving/releases/download/v0.8.0/monitoring.yaml
kubectl apply \
-f https://github.com/knative/serving/releases/download/v0.8.0/serving.yaml \
-f https://github.com/knative/eventing/releases/download/v0.8.0/release.yaml \
-f https://github.com/knative/serving/releases/download/v0.8.0/monitoring.yaml
Thanks
Ok, I found the problem. I tried posting custom images. All worked until I change the port (inside image) to 80. This image not only work as Knative service, but also, It did not work on Cloud run service as well. Bottom line is, either pull port number from environment variable, or hard code it to any other port than 80.