I want to create a sample application with Kubernetes but i get connection refused if i try to connect to the responsive service in Kubernetes.
For example if i connect from another pod to http://random-generator-svc:5050/ i get an error which says connection refused.
this is the yaml file to create the Service and the Deployment for the Random Generator:
apiVersion: v1
kind: Service
metadata:
name: random-generator-svc
labels:
app: rand-gen
spec:
selector:
app: rand-gen
type: NodePort
ports:
- protocol: "TCP"
port: 5050
targetPort: 5050
name: http
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: random-generator-deployment
labels:
app: rand-gen
spec:
replicas: 2
selector:
matchLabels:
app: rand-gen
template:
metadata:
labels:
app: rand-gen
spec:
containers:
- name: random-generator-container
image: toky03/random-generator-image:1.2
ports:
- containerPort: 5050
This is the yaml File wich specifies the Service and the Deployment of the "Caller" Application:
apiVersion: v1
kind: Service
metadata:
name: middle-tier-svc
labels:
app: rand-gen
spec:
selector:
app: rand-gen
type: NodePort
ports:
- protocol: "TCP"
port: 7070
targetPort: 7070
name: http
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: middle-tier-controller
labels:
app: rand-gen
spec:
replicas: 1
selector:
matchLabels:
app: rand-gen
template:
metadata:
labels:
app: rand-gen
spec:
containers:
- name: random-controller-container
image: toky03/random-controller-image:1.2
ports:
- containerPort: 7070
I changed the type to NodePort
to try if this error also exists there but i am able to acess the service from outside of a cluster. Is there probably a problem with my Kubernetes DNS resolver?
Thank you very much in advance for your help.
That's because of a slight typo in your yaml indent. try this
apiVersion: v1
kind: Service
metadata:
name: random-generator-svc
labels:
app: rand-gen
spec:
selector:
app: rand-gen
type: NodePort
ports:
- protocol: "TCP"
port: 5050
targetPort: 5050
name: http
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: random-generator-deployment
labels:
app: rand-gen
spec:
replicas: 2
selector:
matchLabels:
app: rand-gen
template:
metadata:
labels:
app: rand-gen
spec:
containers:
- name: random-generator-container
image: toky03/random-generator-image:1.2
ports:
- containerPort: 5050
if you only want your app to be exposed inside your cluster, just remove type: NodePort
eg:
apiVersion: v1
kind: Service
metadata:
name: random-generator-svc
labels:
app: rand-gen
spec:
selector:
app: rand-gen
ports:
- protocol: "TCP"
port: 5050
targetPort: 5050
name: http
By default, kubernetes creates a virtual proxy. You can then access your service after port forwarding it.
kubectl port-forward svc random-generator-svc 5050:5050