问题
I am unable to curl to the external IP of the service. My Kubernetes cluster is deployed on GKE.
$ kubectl run kubia-container --image=australia/kubia_py --port=8080 --generator=run/v1
kubectl run --generator=run/v1 is DEPRECATED and will be removed in a future version. Use kubectl run --generator=run-pod/v1 or kubectl create instead.
replicationcontroller/kubia-container created
$ kubectl get pods
NAME READY STATUS RESTARTS AGE
kubia-container-6b2cs 1/1 Running 0 25s
$ kubectl expose rc kubia-container --type=LoadBalancer --name kubia-http
service/kubia-http exposed
$ kubectl get pods,svc,rc
NAME READY STATUS RESTARTS AGE
pod/kubia-container-6b2cs 1/1 Running 0 93m
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/kubernetes ClusterIP 10.0.0.1 <none> 443/TCP 6h28m
service/kubia-http LoadBalancer 10.0.4.238 35.188.42.26 8080:30030/TCP 91m
$ curl 35.188.42.26:8080
curl: (7) Failed to connect to 35.188.42.26 port 8080: Connection refused
回答1:
Ive tried many ways to achieve what you want. I assume this image australia/kubia_py is your own. I think you are not able to curl this service as inside this image in file nodeapp.py you have put entry like:
server = HTTPServer(('localhost', 8080), GetHandler)
print ("Starting server, use <Ctrl-C> to stop")
server.serve_forever()
Also if you would check netstat inside container you would see that its listening on 127.0.0.1:8080
# netstat -plnt
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 127.0.0.1:8080 0.0.0.0:* LISTEN 1/python3
I think if instead of 'localhost' you would use 0.0.0.0 it should work.
I found only one way to achieve output of this replicacontroller app (I suggest to try using deployments in the future) was using web-preview. To do that you would need to port-forward your pod.
$ kubectl get pods
NAME READY STATUS RESTARTS AGE
kubia-container-95rrq 1/1 Running 0 44m
user@cloudshell:~ (project-name)$ kubectl port-forward kubia-container-95rrq 8888:8080
Forwarding from 127.0.0.1:8888 -> 8080
Handling connection for 8888
Handling connection for 8888
Port 8888 was just one from default I choose. You have a few in menu.
And using WebPreview (using button from cloud shell). was able to achieve output like below:
CLIENT VALUES:
client_address=('127.0.0.1', 46696) (127.0.0.1)
command=GET
path=/?authuser=0
real path=/
query=authuser=0
request_version=HTTP/1.1
SERVER VALUES:
server_version=BaseHTTP/0.6
sys_version=Python/3.6.9
protocol_version=HTTP/1.0
host_name=kubia-container-95rrq
host_ip=10.44.1.26
In addition, if you are exposing replicacontroller or deployment keep in mind if you will just set --port=8080 it will also automatically set --port-target as 8080. Its preffered if you are using kubectl expose to use flags --port=XX and --target-port=xxxx.
If you would like to check kubia replicacontroller and service you can use this example, like below:
$ kubectl apply -f kubia-rc-and-service-v1.yaml
replicationcontroller/kubia-v1 created
service/kubia created
user@cloudshell:~ (your-project)$ kubectl get rc,svc
NAME DESIRED CURRENT READY AGE
replicationcontroller/kubia-v1 3 3 3 40s
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/kubernetes ClusterIP 10.0.48.1 <none> 443/TCP 8h
service/kubia LoadBalancer 10.0.51.154 35.240.23.237 80:30785/TCP 40s
$ curl 35.240.23.237:80
This is v1 running in pod kubia-v1-zpj6s
Another good example to expose service and access it you can find on Official GKE docs.
回答2:
Try with localhost:30030, that's the nodeport exposed to your host.
If that doesn't work, it means your container is not listening in 8080, you can test that entering the pod and curl localhost:8080.
来源：https://stackoverflow.com/questions/61242293/unable-to-curl-to-external-ip