Kubernetes在Pod内部使用外部服务

Question

im Running Kubernetes (minikube) on Windows via Virtualbox. I've got a Services running on my Host-Service i dont want to put inside my Kubernetes Cluster, how can i access that Services from Inside my Pods?

Im new to to Kubernetes i hope this Questions isnt to stupid to ask.

I tried to create a Service + Endpoint but it didnt work:

 kind: Endpoints apiVersion: v1 metadata: name: vetdb subsets: - addresses: - ip: 192.168.99.100 ports: - port: 3307 

 kind: Service apiVersion: v1 metadata: name: vetdb spec: selector: app: vetdb type: ClusterIP ports: - port: 3306 targetPort: 3307 

i started a ubuntu image inside the same cluster the pod should be running on later and tested the connection:

 $ root@my-shell-7766cd89c6-rtxt2:/# curl vetdb:3307 --output test Host '192.168.99.102' is not allowed to connect to this MariaDB serverroot@my-shell 

This is the same Output i get running (except other Host-IP)

curl 192.168.99.100:3307

on my Host PC ==> Itworks.

But i cant access the Host from inside my Microservices where i really need to access the URL.

 $ kubectl get pods NAME READY STATUS RESTARTS AGE eureka-77f949499-g2l82 1/1 Running 0 2h my-shell-7766cd89c6-rtxt2 1/1 Running 0 2h vet-ms-54b89f9c86-29psf 1/1 Running 10 18m vet-ms-67c774fd9b-2fnjc 0/1 CrashLoopBackOff 7 18m 

The Curl Response i posted above was from Pod: my-shell-7766cd89c6-rtxt2 But i need to access vetdb from vet-ms-*

 $ kubectl logs -f vet-ms-67c774fd9b-2fnjc ... Caused by: java.net.UnknownHostException: vetdb ... 

Spring URL Settings i tried

spring.profiles.datasource.url: jdbc:mysql://vetdb:3307/vetdb?useSSL=false&allowPublicKeyRetrieval=true

 spring.profiles.datasource.url: jdbc:mysql://vetdb:3306/vetdb?useSSL=false&allowPublicKeyRetrieval=true 

spring.profiles.datasource.url: jdbc:mysql://vetdb/vetdb?useSSL=false&allowPublicKeyRetrieval=true

Ty guys

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Edit:// i allowed every Host to Connect to the DB to remove this error

Host '192.168.99.102' is not allowed to connect to this MariaDB

but i still get the Same Unknown Host Exception inside of my Microservices.

Answer 1

I think the Ubuntu image test is most informative here.

From the error message I think the problem is in the MySQL config. You must configure server to listen on port of your host IP address (ie not localhost or socketfile).

In addition, you must also ensure that IP address from pod subnets are allowed to connect also.