I have gotten multiple containers to work in the same pod.
kubectl apply -f myymlpod.yml
kubectl expose pod mypod --name=myname-pod --port 8855 --type=NodePort
then I was able to test the "expose"
minikube service list
..
|-------------|-------------------------|-----------------------------|
| NAMESPACE | NAME | URL |
|-------------|-------------------------|-----------------------------|
| default | kubernetes | No node port |
| default | myname-pod | http://192.168.99.100:30036 |
| kube-system | kube-dns | No node port |
| kube-system | kubernetes-dashboard | No node port |
|-------------|-------------------------|-----------------------------|
Now, my myymlpod.yml has multiple containers in it. One container has a service running on 8855, and one on 8877.
The below article ~hints~ at what I need to do .
https://www.mirantis.com/blog/multi-container-pods-and-container-communication-in-kubernetes/
Exposing multiple containers in a Pod
While this example shows how to use a single container to access other containers in the pod, it’s quite common for several containers in a Pod to listen on different ports — all of which need to be exposed. To make this happen, you can either create a single service with multiple exposed ports, or you can create a single service for every poirt you’re trying to expose.
"create a single service with multiple exposed ports"
I cannot find anything on how to actually do this, expose multiple ports.
How does one expose multiple ports on a single service?
Thank you.
APPEND:
K8Containers.yml (below)
apiVersion: v1
kind: Pod
metadata:
name: mypodkindmetadataname
labels:
example: mylabelname
spec:
containers:
- name: containername-springbootfrontend
image: mydocker.com/webfrontendspringboot:latest
resources:
limits:
memory: "800Mi"
cpu: "800m"
requests:
memory: "612Mi"
cpu: "400m"
ports:
- containerPort: 8877
- name: containername-businessservicesspringboot
image: mydocker.com/businessservicesspringboot:latest
resources:
limits:
memory: "800Mi"
cpu: "800m"
requests:
memory: "613Mi"
cpu: "400m"
ports:
- containerPort: 8855
kubectl apply -f K8containers.yml
pod "mypodkindmetadataname" created
kubectl get pods
NAME READY STATUS RESTARTS AGE
mypodkindmetadataname 2/2 Running 0 11s
k8services.yml (below)
apiVersion: v1
kind: Service
metadata:
name: myymlservice
labels:
name: myservicemetadatalabel
spec:
type: NodePort
ports:
- name: myrestservice-servicekind-port-name
port: 8857
targetPort: 8855
- name: myfrontend-servicekind-port-name
port: 8879
targetPort: 8877
selector:
name: mypodkindmetadataname
........
kubectl apply -f K8services.yml
service "myymlservice" created
........
minikube service myymlservice --url
http://192.168.99.100:30784
http://192.168.99.100:31751
........
kubectl describe service myymlservice
Name: myymlservice
Namespace: default
Labels: name=myservicemetadatalabel
Annotations: kubectl.kubernetes.io/last-applied-configuration={"apiVersion":"v1","kind":"Service","metadata":{"annotations":{},"labels":{"name":"myservicemetadatalabel"},"name":"myymlservice","namespace":"default"...
Selector: name=mypodkindmetadataname
Type: NodePort
IP: 10.107.75.205
Port: myrestservice-servicekind-port-name 8857/TCP
TargetPort: 8855/TCP
NodePort: myrestservice-servicekind-port-name 30784/TCP
Endpoints: <none>
Port: myfrontend-servicekind-port-name 8879/TCP
TargetPort: 8877/TCP
NodePort: myfrontend-servicekind-port-name 31751/TCP
Endpoints: <none>
Session Affinity: None
External Traffic Policy: Cluster
Events: <none>
....
Unfortunately, it is still not working when I try to invoke the "exposed" items.
calling
http://192.168.99.100:30784/myrestmethod
does not work
and calling
http://192.168.99.100:31751
or
http://192.168.99.100:31751/index.html
does not work
Anyone see what I'm missing.
APPEND (working now)
The selector does not match on "name", it matches on label(s).
k8containers.yml (partial at the top)
apiVersion: v1
kind: Pod
metadata:
name: mypodkindmetadataname
labels:
myexamplelabelone: mylabelonevalue
myexamplelabeltwo: mylabeltwovalue
spec:
containers:
# Main application container
- name: containername-springbootfrontend
image: mydocker.com/webfrontendspringboot:latest
resources:
limits:
memory: "800Mi"
cpu: "800m"
requests:
memory: "612Mi"
cpu: "400m"
ports:
- containerPort: 8877
- name: containername-businessservicesspringboot
image: mydocker.com/businessservicesspringboot:latest
resources:
limits:
memory: "800Mi"
cpu: "800m"
requests:
memory: "613Mi"
cpu: "400m"
ports:
- containerPort: 8855
k8services.yml
apiVersion: v1
kind: Service
metadata:
name: myymlservice
labels:
name: myservicemetadatalabel
spec:
type: NodePort
ports:
- name: myrestservice-servicekind-port-name
port: 8857
targetPort: 8855
- name: myfrontend-servicekind-port-name
port: 8879
targetPort: 8877
selector:
myexamplelabelone: mylabelonevalue
myexamplelabeltwo: mylabeltwovalue
