K
Q

404 when I curl a kubernetes tomcat service

3/9/2020

Hello I am trying to deploy a simple tomcat service. Below are the details:

1.minikube version: v1.8.1

2.OS: mac

3.The deployment.yaml file (I am in the directory of the yaml file)

apiVersion: apps/v1
kind: Deployment
metadata:
  name: tomcat-deployment
spec:
  selector:
    matchLabels:
      app: tomcat
  replicas: 1
  template:
    metadata:
      labels:
        app: tomcat
    spec:
      containers:
      - name: tomcat
        image: tomcat:9.0
        ports:
        - containerPort: 8080

4.Commands used to deploy and expose the service

kubectl apply -f deployment.yaml

kubectl expose deployment tomcat-deployment --type=NodePort

minikube service tomcat-deployment --url

curl [URL]

I get a 404 when I curl the URL. I am unsure if there's an issue with the deployment.yaml file or some minikube settings.

-- Nath
devops
docker
kubectl
kubernetes
minikube

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1 Answer

3/9/2020

You should set target-Port which in your case would be 8080.

All of this is nicely explained on Set up Ingress on Minikube with the NGINX Ingress Controller

  1. Create a Deployment using the following command:

kubectl run web --image=gcr.io/google-samples/hello-app:1.0 --port=8080

  • Output:

deployment.apps/web created

  1. Expose the Deployment:

kubectl expose deployment web --target-port=8080 --type=NodePort

  • Output:

service/web exposed

  1. Verify the Service is created and is available on a node port:

kubectl get service web

  • Output:
   NAME      TYPE       CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE
   web       NodePort   10.104.133.249   <none>        8080:31637/TCP   12m
  1. Visit the service via NodePort:

minikube service web --url

  • Output:

http://172.17.0.15:31637

If that does not help check the logs of the tomcat pod to see it started on port 8080 Look for a line

09-Mar-2020 13:36:00.157 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["http-nio-8080"]

You can also check docker logs by first locating the docker container docker ps and fetching the logs from it with docker logs <container-name>

-- Crou
Source: StackOverflow