Open port in mini cube

Question

In a minibook, how to open a service using nodeport?

For example, I start the kubernetes cluster using the following command, and create and set the port as follows:

$ minikube start $ kubectl run hello-minikube --image=gcr.io/google_containers/echoserver:1.4 --port=8080 $ kubectl expose deployment hello-minikube --type=NodePort $ curl $(minikube service hello-minikube --url) CLIENT VALUES: client_address=192.168.99.1 command=GET real path=/ .... 

Now, how to access the open service from the host? I assume that the mini cube node should be configured to expose this port.

Answer 1

I'm not quite sure what you are asking, because it looks like you already know about the minikube service <SERVICE_NAME> --url , which will give you a URL where you can access the service. To open an open service, you can use the minikube service <SERVICE_NAME> command:

 $ kubectl run hello-minikube --image=gcr.io/google_containers/echoserver:1.4 --port=8080 deployment "hello-minikube" created $ kubectl expose deployment hello-minikube --type=NodePort service "hello-minikube" exposed $ kubectl get svc NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE hello-minikube 10.0.0.102 <nodes> 8080/TCP 7s kubernetes 10.0.0.1 <none> 443/TCP 13m $ minikube service hello-minikube Opening kubernetes service default/hello-minikube in default browser... 

This command will open the specified service in the default browser. Here's the minikube service documentation: https://github.com/kubernetes/minikube/blob/master/docs/minikube_service.md

There is also the --url option to print the service URL that opens in the browser:

 $ minikube service hello-minikube --url http://192.168.99.100:31167 

Answer 2

Minikube runs on something like 192.168.99.100 . Therefore, you must have access to it through NodePort on the NodePort you provide your services. For example, let's say your NodePort 30080 , then your service will be available as 192.168.99.100:30080 NodePort 30080 .

To get the ip minicube, run the minikube ip command.

September 14, 2017 Patch:

Here is a small example that works with minikube v0.16.0 .

1) Run the commands below to create nginx running on 8080 and redirect NodePort svc :

 $ kubectl run hello-minikube --image=gcr.io/google_containers/echoserver:1.4 --port=8080 deployment "hello-minikube" created $ kubectl expose deployment hello-minikube --type=NodePort service "hello-minikube" exposed 

2) Find the nodeport used by svc:

 $ kubectl get svc hello-minikube NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE hello-minikube 10.0.0.76 <nodes> 8080:30341/TCP 4m 

3) Find the ip minicub:

 $ minikube ip 192.168.99.100 

4) Talk to him using curl:

 $ curl 192.168.99.100:30341 CLIENT VALUES: client_address=172.17.0.1 command=GET real path=/ ... 

Answer 3

Since minikube provides access through nodeIP:nodePort and not through localhost:nodePort , you can achieve this using kubectl port forwarding kubectl . For example, if you use the mongodb service:

 kubectl port-forward svc/mongo 27017:27017 

This would expose the service to localhost:27017 , FWIW. In addition, you can figure out how to run this in the background.

Answer 4

Just a note for those looking for answers about connection denial: if your mini cube doesn’t work on “something like 192.168.99.100”, you are probably working with another vm driver, such as “none”. In this case, delete the Minikube cluster and rebuild it using the default settings. it will work .... ish ... I can't get the tunnel to work ...