how can I debug a 404 on an endpoints deployed to k8s?

[Nick Longinow]

I'm getting this error.  How should I debug it?  It's basically the sample application on GCP (echo app) but I changed the url to "alive" instead of "echo".

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

}

[Rob Wyrick]

It's difficult to say since you didn't specify what, exactly, you changed.    Based on the 404, I'm guessing the deployed code is not expecting a "/alive" path.

Can you supply more details?

Are you using AppEngine?  AppEngine Flex?  GKE?  etc.

Did you modify the code to look for the "/alive" path?

-Rob

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[Nick Longinow]

Thanks Rob.  I'm using GKE.  I'll double check that the /alive path is properly deployed.  

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[Nick Longinow]

Might have figured it out.  The example deploys the "echo" app into a GAE container image. My endpoints run in a Spring Boot container.   

Is this the rule?

--> When deploying GCP Endpoints code into GKE, that endpoints code must live in a GAE container?

------------------------form the echo example code-----------------------

FROM gcr.io/google_appengine/jetty9

[Rob Wyrick]

The echo app (gcr.io/google-samples/echo-go:latest) that is deployed is a Docker container image.  I'm not sure what you mean by a "Spring boot container".  From what I can tell, I believe that Spring boot containers are also docker containers, so they should work just fine.

-Rob

[Rose Davidson]

If you're referring to https://github.com/GoogleCloudPlatform/java-docs-samples/blob/master/endpoints/getting-started/src/main/docker/Dockerfile, then that is a code example for Google App Engine Flexible, yes. Since you're working with Kubernetes, you should probably consult the "Getting started with Cloud Endpoints on Kubernetes" document: https://cloud.google.com/endpoints/docs/openapi/get-started-kubernetes

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[Nick Longinow]

If I deploy my endpoints Java code to a GAE image container, it works.  If I deploy the same code to a generic Tomcat container image, it fails to work. 

So, I'm wondering if endpoints functionality must live in a GAE environment (either base container image, or GAE flexible or standard).

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[Rose Davidson]

No, it is entirely possible to deploy endpoints backends to Kubernetes or any other arbitrary compute environment, which is why we have tutorials showing how to deploy on Kubernetes.

It may be the case that your "endpoints Java code" is designed to work only on GAE, though; I would have to examine your code to determine this.

[Nick Longinow]

As an experiment, I'll try modifying the example (echo) application to deploy to a Tomcat container instead of GAE base image.  Once I've tried that I'll report back

[Rose Davidson]

If you want to try deploying Endpoints with Kubernetes, I would recommend following our quickstart that shows how to do this: https://cloud.google.com/endpoints/docs/openapi/get-started-kubernetes

[Nick Longinow]

Thanks but that is the example I have been using.  I was able to get it to work as-is, but when I added my own container image (jdk-alpine) holding my spring boot application version of the endpoints, it gives a 404 for the methods. I did notice that the example Dockerfile deploys as so:

FROM gcr.io/google_appengine/jetty9

ADD endpoints-1.0-SNAPSHOT.war $JETTY_BASE/webapps/root.war

ADD . /app

RUN chown jetty:jetty $JETTY_BASE/webapps/root.war

while MINE deploys as so

FROM openjdk:8-jdk-alpine

VOLUME /tmp

COPY target/frontend-0.0.1-SNAPSHOT.jar app.jar

ENV JAVA_OPTS=""

ENTRYPOINT exec java -Dserver.port=8085 -jar /app.jar

wondering if I make mine also deploy with Jetty maybe it will work?

[Rose Davidson]

I doubt Jetty is the problem. Why are you running on port 8085? The quickstart has the echo service running on port 8081. If you wish to change that, you will need to change the backend configuration for the endpoints-runtime container.

[Nick Longinow]

I had tried port 8080 for the ESP container and 8081 for mine, but it had no effect.  I can try that again to see if it works (will also change my Dockerfile)

[Rose Davidson]

You can run the backend container on whatever port you wish; you just have to make sure the hostname and port provided in the --backend argument for the endpoints-runtime container corresponds to a hostname and port on which your service can be reached. When in doubt, verify that the service is actually running on that host and port.

[Nick Longinow]

Thanks - will debug further.  I wish GCP had an API Explorer for endpoints.  So you could trace the call from a UI test window and see it percolate into the backend. 

[Nick Longinow]

I got it to work when I deployed my Spring Boot app as a war and used a jetty container image.  I was following this article: https://cloud.google.com/endpoints/docs/openapi/get-started-kubernetes

article says:

FROM gcr.io/google_appengine/jetty9

I suggest using:

FROM gcr.io/google_appengine/jetty

Will help users avoid this issue.  https://github.com/eclipse/jetty.project/issues/1692

[Rob Wyrick]

Glad to hear you got it working!

-Rob

[Nick Longinow]

sure glad this group exists to ask questions! thanks again 

[Nick Longinow]

Thanks again for your help.  I got it working and published a tutorial that might help others.  

https://medium.com/@nicklonginow/using-google-kubernetes-engine-to-host-google-cloud-endpoints-6896c008ed98