ipvs not update correctly when service update

[chinglinwen]

Step to reproduce

1. create service with port 80 and wrong targetPort 8001
2. apply
3. change targetPort to 8000 ( correct port )
4. apply
5. see if service is ok ( service is not ok )

// there maybe other combination to concern too
not provide targetPort, update service port what will happen
provide both port and targetPort, update one of them, what will happen

kubectl apply -f fstest.yaml

[wen@234 k8snew ~]$ kubectl get svc -n t
NAME   TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)   AGE
fs     ClusterIP   10.110.95.160   <none>        80/TCP    5s
[wen@234 k8snew ~]$ 
[wen@234 k8snew ~]$ kubectl get ep -n t
NAME   ENDPOINTS         AGE
fs     10.11.3.17:8001   48s
[wen@234 k8snew ~]$ 8pods fs
t                fs-699cc6b596-ngxjw                           1/1     Running   0          53s     10.11.3.17      172.31.81.111   <none>           <none>
[wen@234 k8snew ~]$ 

[root@online-node-81-111 ~]# ipvsadm -Ln |grep -A 3 10.110.95.160
TCP  10.110.95.160:80 rr persistent 10800
  -> 10.11.3.17:8001              Masq    1      0          0         
UDP  10.96.0.10:53 rr
  -> 10.11.0.193:53               Masq    1      0          237       
[root@online-node-81-111 ~]# curl 10.110.95.160
curl: (7) Failed connect to 10.110.95.160:80; Connection refused

// should have one entry below

[root@online-node-81-111 ~]# ipvsadm -Ln |grep -A 3 10.110.95.160
TCP  10.110.95.160:80 rr persistent 10800
  -> 10.11.3.17:8000              Masq    1      0          0         
  -> 10.11.3.17:8001              Masq    1      0          0         
UDP  10.96.0.10:53 rr
[root@online-node-81-111 ~]# curl 10.110.95.160
curl: (7) Failed connect to 10.110.95.160:80; Connection refused  // this should be ok
[root@online-node-81-111 ~]# curl 10.11.3.17:8000
<pre>
</pre>
[root@online-node-81-111 ~]# curl 10.11.3.17:8001
curl: (7) Failed connect to 10.11.3.17:8001; Connection refused
[root@online-node-81-111 ~]#

apiVersion: v1
kind: Namespace
metadata:
  name: t
---
# Service
apiVersion: v1
kind: Service
metadata:
  name: fs
  namespace: t
spec:
  ports:
  - name: web
    targetPort: 8001
    port: 80
  selector:
    app: fs
  sessionAffinity: ClientIP

# Deployment
---
apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: fs
  namespace: t
  labels:
    app: fs
spec:
  replicas: 1
  selector:
    matchLabels:
      app: fs
  template:
    metadata:
      labels:
        app: fs
    spec:
      nodeSelector:
        func: "monitor"
      containers:
        - name: fs
          image: chinglinwen/fs
          ports:
          - containerPort: 8000

version

Running /usr/local/bin/kube-router version v0.2.5, built on 2019-02-01T04:01:01+0000, go1.10.8
CentOS Linux release 7.4.1708 (Core)

[aauren]

Thanks for reporting! This should be resolved by #842 Duplicate of #715