The backend uses Springboot to provide a WebSocket connection and sets the maximum idle time to 3 minutes. The program runs well in local. After 3 minutes of idle, the connection will be disconnected as scheduled. It can also be accessed normally by node port service when deployed in Kubernetes.
But when I inject sidecar into this backend pod, there is a problem. The connection doesn't work properly, often breaks, and is completely irregular. Sometimes when the frontend and backend are sending messages, it is interrupted suddenly. Sometimes it is interrupted after about 2 minutes idle. And sometimes the connection can only last for tens of seconds.
When the connection is interrupted, the backend will throw java.io.EOFException, and the frontend will receive the on close event.
This phenomenon will occur as long as a sidecar is injected into the pod(Even if I use node port service to access the pod). Also, I did a test, I used Nginx to transfer the request to port 31380 of istio-ingressgateway, and configured the gateway vs and dr as follows. But the result is the same.
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
run: msapi
version: product
name: msapi
namespace: test
spec:
replicas: 1
selector:
matchLabels:
run: msapi
template:
metadata:
labels:
run: msapi
spec:
containers:
- env:
- name: JAVA_OPTS
valueFrom:
configMapKeyRef:
key: jvm.options
name: test-config
image: test/msapi:1.0.0
imagePullPolicy: Always
name: msapi
ports:
- containerPort: 9000
protocol: TCP
---
apiVersion: v1
kind: Service
metadata:
name: msapi
namespace: test
spec:
ports:
- port: 80
protocol: TCP
targetPort: 9000
selector:
run: msapi
type: ClusterIP
---
apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
name: ingress-test
namespace: test
spec:
selector:
istio: ingressgateway
servers:
- hosts:
- '*.ingress.xxx.com'
port:
name: http
number: 80
protocol: HTTP
---
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
name: msapi
namespace: test
spec:
gateways:
- ingress-test
hosts:
- msapi.ingress.xxx.com
http:
- match:
- headers:
cookie:
regex: ^(.*?; ?)?(version=pre)(;.*)?$
route:
- destination:
host: msapi
subset: pre
- route:
- destination:
host: msapi
subset: product
---
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
name: msapi
namespace: test
spec:
host: msapi
subsets:
- labels:
version: product
name: product
- labels:
version: pre
name: pre
