Taher Bohari
000aa4520e
In given manifest, podManagementPolicy is set as Parallel, but in later section of page, the console logs of "kubectl get pods -w -l app=zk" command displays ordered behavior, which is not the actual result in case of Parallel option. Sample logs from doc : NAME READY STATUS RESTARTS AGE zk-0 0/1 Pending 0 0s zk-0 0/1 Pending 0 0s zk-0 0/1 ContainerCreating 0 0s zk-0 0/1 Running 0 19s zk-0 1/1 Running 0 40s zk-1 0/1 Pending 0 0s zk-1 0/1 Pending 0 0s zk-1 0/1 ContainerCreating 0 0s zk-1 0/1 Running 0 18s zk-1 1/1 Running 0 40s zk-2 0/1 Pending 0 0s zk-2 0/1 Pending 0 0s zk-2 0/1 ContainerCreating 0 0s zk-2 0/1 Running 0 19s zk-2 1/1 Running 0 40s ## here pods are created in order Actual results after applying the given manifest : [taher@kubernetes-docker ~]$ kubectl apply -f zookeeper.yaml service/zk-hs created service/zk-cs created poddisruptionbudget.policy/zk-pdb created statefulset.apps/zk created [taher@kubernetes-docker ~]$ kubectl get pods -w -l app=zk NAME READY STATUS RESTARTS AGE zk-0 0/1 Pending 0 3s zk-1 0/1 Pending 0 3s zk-2 0/1 ContainerCreating 0 3s zk-1 0/1 Pending 0 4s zk-0 0/1 Pending 0 4s zk-1 0/1 Pending 0 5s zk-0 0/1 Pending 0 5s zk-1 0/1 Pending 0 5s zk-1 0/1 ContainerCreating 0 5s zk-0 0/1 Pending 0 5s zk-2 0/1 Running 0 19s zk-1 0/1 Running 0 24s zk-2 1/1 Running 0 35s zk-1 1/1 Running 0 37s ## here pods are created in parallel Resolution : Either change the value of podManagementPolicy option to OrderedReady or remove that option, so that StatefulSet will take it's default behavior.
134 lines
2.8 KiB
YAML
134 lines
2.8 KiB
YAML
apiVersion: v1
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kind: Service
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metadata:
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name: zk-hs
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labels:
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app: zk
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spec:
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ports:
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- port: 2888
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name: server
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- port: 3888
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name: leader-election
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clusterIP: None
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selector:
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app: zk
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---
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apiVersion: v1
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kind: Service
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metadata:
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name: zk-cs
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labels:
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app: zk
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spec:
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ports:
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- port: 2181
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name: client
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selector:
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app: zk
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---
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apiVersion: policy/v1beta1
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kind: PodDisruptionBudget
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metadata:
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name: zk-pdb
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spec:
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selector:
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matchLabels:
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app: zk
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maxUnavailable: 1
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---
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apiVersion: apps/v1
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kind: StatefulSet
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metadata:
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name: zk
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spec:
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selector:
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matchLabels:
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app: zk
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serviceName: zk-hs
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replicas: 3
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updateStrategy:
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type: RollingUpdate
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podManagementPolicy: OrderedReady
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template:
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metadata:
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labels:
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app: zk
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spec:
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affinity:
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podAntiAffinity:
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requiredDuringSchedulingIgnoredDuringExecution:
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- labelSelector:
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matchExpressions:
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- key: "app"
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operator: In
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values:
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- zk
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topologyKey: "kubernetes.io/hostname"
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containers:
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- name: kubernetes-zookeeper
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imagePullPolicy: Always
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image: "k8s.gcr.io/kubernetes-zookeeper:1.0-3.4.10"
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resources:
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requests:
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memory: "1Gi"
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cpu: "0.5"
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ports:
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- containerPort: 2181
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name: client
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- containerPort: 2888
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name: server
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- containerPort: 3888
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name: leader-election
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command:
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- sh
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- -c
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- "start-zookeeper \
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--servers=3 \
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--data_dir=/var/lib/zookeeper/data \
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--data_log_dir=/var/lib/zookeeper/data/log \
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--conf_dir=/opt/zookeeper/conf \
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--client_port=2181 \
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--election_port=3888 \
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--server_port=2888 \
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--tick_time=2000 \
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--init_limit=10 \
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--sync_limit=5 \
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--heap=512M \
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--max_client_cnxns=60 \
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--snap_retain_count=3 \
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--purge_interval=12 \
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--max_session_timeout=40000 \
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--min_session_timeout=4000 \
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--log_level=INFO"
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readinessProbe:
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exec:
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command:
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- sh
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- -c
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- "zookeeper-ready 2181"
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initialDelaySeconds: 10
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timeoutSeconds: 5
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livenessProbe:
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exec:
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command:
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- sh
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- -c
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- "zookeeper-ready 2181"
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initialDelaySeconds: 10
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timeoutSeconds: 5
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volumeMounts:
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- name: datadir
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mountPath: /var/lib/zookeeper
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securityContext:
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runAsUser: 1000
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fsGroup: 1000
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volumeClaimTemplates:
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- metadata:
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name: datadir
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spec:
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accessModes: [ "ReadWriteOnce" ]
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resources:
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requests:
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storage: 10Gi
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