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Pod AntiAffinity with PodAffinity + NotIn does not work
Context: video 47 from CKA course (Pod Affinity and Pod Anti-Affinity). Code use to produce pod antiaffinity.
Using this code (PodAffinity + NotIn to achieve PodAntiAffinity) does not work for me. The pod is scheduled on the same node as frontend app. Label app=frontend is present on frontend app.
$ kubectl get pods -o wide --show-labels
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES LABELS
frontend 1/1 Running 0 86m 10.244.1.47 pool-axe79dmr0-8or0s <none> <none> app=frontend,run=frontend
$ md5sum podaffinity-required.yaml
8e217e52a432bee34d1aab01226d393c podaffinity-required.yaml
$ kubectl apply -f podaffinity-required.yaml
pod/kplabs-pod-affinity created
$ kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
frontend 1/1 Running 0 87m 10.244.1.47 pool-axe79dmr0-8or0s <none> <none>
kplabs-pod-affinity 1/1 Running 0 11s 10.244.1.3 pool-axe79dmr0-8or0s <none> <none>
But using PodAntiAffinity + In does the trick:
$ kubectl delete -f podaffinity-required.yaml
pod "kplabs-pod-affinity" deleted
$ cat podantiaffinity-required.yaml
apiVersion: v1
kind: Pod
metadata:
name: kplabs-pod-affinity
spec:
affinity:
podAntiAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
- labelSelector:
matchExpressions:
- key: app
operator: In
values:
- frontend
topologyKey: kubernetes.io/hostname
containers:
- name: pod-affinity
image: nginx
$ kubectl apply -f podantiaffinity-required.yaml
pod/kplabs-pod-affinity created
$ kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
frontend 1/1 Running 0 89m 10.244.1.47 pool-axe79dmr0-8or0s <none> <none>
kplabs-pod-affinity 1/1 Running 0 5s 10.244.0.191 worker-node-8ouvr <none> <none>
Other user also had this problem. I'm using the Digital Ocean managed kuberentes created two days ago.
Weave : issue
I am running two worker nodes and by running weave I am getting following error:
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Pulled 4m16s kubelet, worker-1 Container image "docker.io/weaveworks/weave-npc:2.6.0" already present on machine
Normal Created 4m16s kubelet, worker-1 Created container
Normal Started 4m16s kubelet, worker-1 Started container
Normal Pulled 3m45s (x2 over 4m17s) kubelet, worker-1 Container image "docker.io/weaveworks/weave-kube:2.6.0" already present on machine
Normal Created 3m45s (x2 over 4m16s) kubelet, worker-1 Created container
Normal Started 3m45s (x2 over 4m16s) kubelet, worker-1 Started container
Warning Unhealthy 3m24s (x6 over 4m14s) kubelet, worker-1 Readiness probe failed: Get http://127.0.0.1:6784/status: dial tcp 127.0.0.1:6784: connect: connection refused
Warning BackOff 3m14s kubelet, worker-1 Back-off restarting failed container
Normal Scheduled 74s default-scheduler Successfully assigned kube-system/weave-net-9nkg7 to worker-1
Kinldy let me know where I am going wrong
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