kubernetes connection refused during deployment - kubernetes

Question

I'm trying to achieve a zero downtime deployment using kubernetes and during my test the service doesn't load balance well.
My kubernetes manifest is:
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: myapp-deployment
spec:
replicas: 3
strategy:
type: RollingUpdate
rollingUpdate:
maxUnavailable: 0
maxSurge: 1
template:
metadata:
labels:
app: myapp
version: "0.2"
spec:
containers:
- name: myapp-container
image: gcr.io/google-samples/hello-app:1.0
imagePullPolicy: Always
ports:
- containerPort: 8080
protocol: TCP
readinessProbe:
httpGet:
path: /
port: 8080
initialDelaySeconds: 5
periodSeconds: 5
successThreshold: 1
---
apiVersion: v1
kind: Service
metadata:
name: myapp-lb
labels:
app: myapp
spec:
type: LoadBalancer
externalTrafficPolicy: Local
ports:
- port: 80
targetPort: 8080
selector:
app: myapp
If I loop over the service with the external IP, let's say:
$ kubectl get services
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.35.240.1 <none> 443/TCP 1h
myapp-lb LoadBalancer 10.35.252.91 35.205.100.174 80:30549/TCP 22m
using the bash script:
while True
do
curl 35.205.100.174
sleep 0.2s
done
I receive some connection refused during the deployment:
curl: (7) Failed to connect to 35.205.100.174 port 80: Connection refused
The application is the default helloapp provided by Google Cloud Platform and running on 8080.
Cluster information:
Kubernetes version: 1.8.8
Google cloud platform
Machine type: g1-small

Answer 1

It looks like your request goes to a not started pod. I have avoided this by adding a few parameters:
Liveness probe to be sure app has already started
maxUnavalible: 1 to deploy pods one by one
I still have some errors, but they are acceptable because they rarely happen . During the deployment, an error may occur once or twice, so with increasing load you will have a negligible amount of errors. I mean one or two errors per 2000 requests during the deployment.