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在kubernetes上部署zookeeper,kafka集群

LM123
2019-12-06 17:50:40

本文采用网上镜像:mirrorgooglecontainers/kubernetes-zookeeper:1.0-3.4.10

准备共享存储:nfs,glusterfs,seaweed或其他,并在node节点挂载

本次采用seaweed分布式文件系统

node节点挂载:

./weed mount -filer=192.168.11.103:8801 -dir=/data/ -filer.path=/ &

准备kubernetes集群环境:

[root@k8s-master sts]# kubectl get nodes -o wide
NAME         STATUS   ROLES    AGE   VERSION   INTERNAL-IP      EXTERNAL-IP   OS-IMAGE                KERNEL-VERSION          CONTAINER-RUNTIME
k8s-master   Ready    master   97d   v1.15.0   192.168.10.171   <none>        CentOS Linux 7 (Core)   3.10.0-862.el7.x86_64   docker://19.3.1
k8s-node1    Ready    node     97d   v1.15.0   192.168.11.63    <none>        CentOS Linux 7 (Core)   3.10.0-862.el7.x86_64   docker://19.3.1
[root@k8s-master sts]# 

创建pv

使用本地目录创建pv, 确定node节点已经挂载共享存储..使用本地目录也可以

[root@k8s-master sts]# cat zk-pv.yaml 
kind: PersistentVolume
apiVersion: v1
metadata:
  name: pv-zk1
  namespace: bigdata
  annotations:
    volume.beta.kubernetes.io/storage-class: "anything"
  labels:
    type: local
spec:
  capacity:
    storage: 3Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/data/zookeeper1"
  persistentVolumeReclaimPolicy: Recycle
---
kind: PersistentVolume
apiVersion: v1
metadata:
  name: pv-zk2
  namespace: bigdata
  annotations:
    volume.beta.kubernetes.io/storage-class: "anything"
  labels:
    type: local
spec:
  capacity:
    storage: 3Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/data/zookeeper2"
  persistentVolumeReclaimPolicy: Recycle
---
kind: PersistentVolume
apiVersion: v1
metadata:
  name: pv-zk3
  namespace: bigdata
  annotations:
    volume.beta.kubernetes.io/storage-class: "anything"
  labels:
    type: local
spec:
  capacity:
    storage: 3Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/data/zookeeper3"
  persistentVolumeReclaimPolicy: Recycle
[root@k8s-master sts]# 

如下:

[root@k8s-master sts]# kubectl get pv
NAME     CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS      CLAIM   STORAGECLASS   REASON   AGE
pv-zk1   3Gi        RWO            Recycle          Available           anything                5s
pv-zk2   3Gi        RWO            Recycle          Available           anything                5s
pv-zk3   3Gi        RWO            Recycle          Available           anything                5s

创建zk sts:

[root@k8s-master sts]# cat zk-sts.yaml 
---
apiVersion: v1
kind: Service
metadata:
  name: zk-hs
  namespace: bigdata
  labels:
    app: zk
spec:
  ports:
  - port: 2888
    name: server
  - port: 3888
    name: leader-election
  clusterIP: None
  selector:
    app: zk
---
apiVersion: v1
kind: Service
metadata:
  name: zk-cs
  namespace: bigdata
  labels:
    app: zk
spec:
  ports:
  - port: 2181
    name: client
  selector:
    app: zk
---
apiVersion: policy/v1beta1
kind: PodDisruptionBudget
metadata:
  name: zk-pdb
  namespace: bigdata
spec:
  selector:
    matchLabels:
      app: zk
  maxUnavailable: 1
---
apiVersion: apps/v1beta1
kind: StatefulSet
metadata:
  name: zk
  namespace: bigdata
spec:
  serviceName: zk-hs
  replicas: 3
  updateStrategy:
    type: RollingUpdate
  podManagementPolicy: Parallel
  updateStrategy:
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: zk
    spec:
      containers:
      - name: kubernetes-zookeeper
        imagePullPolicy: IfNotPresent
        image: "mirrorgooglecontainers/kubernetes-zookeeper:1.0-3.4.10"
        resources:
          requests:
            memory: "128Mi"
            cpu: "0.1"
        ports:
        - containerPort: 2181
          name: client
        - containerPort: 2888
          name: server
        - containerPort: 3888
          name: leader-election
        command:
        - sh
        - -c
        - "start-zookeeper 
          --servers=3 
          --data_dir=/var/lib/zookeeper/data 
          --data_log_dir=/var/lib/zookeeper/data/log 
          --conf_dir=/opt/zookeeper/conf 
          --client_port=2181 
          --election_port=3888 
          --server_port=2888 
          --tick_time=2000 
          --init_limit=10 
          --sync_limit=5 
          --heap=512M 
          --max_client_cnxns=60 
          --snap_retain_count=3 
          --purge_interval=12 
          --max_session_timeout=40000 
          --min_session_timeout=4000 
          --log_level=INFO"
        readinessProbe:
          exec:
            command:
            - sh
            - -c
            - "zookeeper-ready 2181"
          initialDelaySeconds: 10
          timeoutSeconds: 5
        livenessProbe:
          exec:
            command:
            - sh
            - -c
            - "zookeeper-ready 2181"
          initialDelaySeconds: 10
          timeoutSeconds: 5
        volumeMounts:
        - name: datadir
          mountPath: /var/lib/zookeeper
      securityContext:
        runAsUser: 1000
        fsGroup: 1000
  volumeClaimTemplates:
  - metadata:
      name: datadir
      annotations:
        volume.beta.kubernetes.io/storage-class: "anything"
    spec:
      accessModes: [ "ReadWriteOnce" ]
      resources:
        requests:
          storage: 3Gi
[root@k8s-master sts]#

源模板文件:https://github.com/kow3ns/kubernetes-zookeeper/blob/master/manifests/zookeeper_mini.yaml

注意:有修改

由于镜像默认是zookeeper用户,所有会出现没有权限创建zookeeper目,如下所示:

修改挂载目录权限即可.简单暴力: chmod 777 ${{dirname}}

 

zk启动成功后:如下,pvc绑定pv

[root@k8s-master sts]# kubectl get pods -n bigdata
NAME   READY   STATUS    RESTARTS   AGE
zk-0   1/1     Running   0          18m
zk-1   1/1     Running   3          18m
zk-2   1/1     Running   2          18m
[root@k8s-master sts]# kubectl get pv
NAME     CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM                  STORAGECLASS   REASON   AGE
pv-zk1   3Gi        RWO            Recycle          Bound    bigdata/datadir-zk-2   anything                23m
pv-zk2   3Gi        RWO            Recycle          Bound    bigdata/datadir-zk-0   anything                23m
pv-zk3   3Gi        RWO            Recycle          Bound    bigdata/datadir-zk-1   anything                23m
[root@k8s-master sts]# kubectl get pvc -n bigdata
NAME           STATUS   VOLUME   CAPACITY   ACCESS MODES   STORAGECLASS   AGE
datadir-zk-0   Bound    pv-zk2   3Gi        RWO            anything       23m
datadir-zk-1   Bound    pv-zk3   3Gi        RWO            anything       23m
datadir-zk-2   Bound    pv-zk1   3Gi        RWO            anything       23m
[root@k8s-master sts]# 

在node节点查看数据目录结构如下:

[root@k8s-node1 data]# tree -L 3 /data/
/data/
├── test
│   ├── a.txt
│   └── aaa.jpg
├── zookeeper1
│   └── data
│       ├── log
│       ├── myid
│       └── version-2
├── zookeeper2
│   └── data
│       ├── log
│       ├── myid
│       └── version-2
└── zookeeper3
    └── data
        ├── log
        ├── myid
        └── version-2

13 directories, 5 files
[root@k8s-node1 data]# 

查看主机名:

[root@k8s-master sts]# for i in 0 1 2; do kubectl exec zk-$i -n bigdata -- hostname; done
zk-0
zk-1
zk-2

查看myid

[root@k8s-master sts]# for i in 0 1 2; do echo "myid zk-$i";kubectl exec zk-$i -n bigdata -- cat /var/lib/zookeeper/data/myid; done
myid zk-0
1
myid zk-1
2
myid zk-2
3

查看完整域名

[root@k8s-master sts]# for i in 0 1 2; do kubectl exec zk-$i -n bigdata -- hostname -f; done
zk-0.zk-hs.bigdata.svc.cluster.local
zk-1.zk-hs.bigdata.svc.cluster.local
zk-2.zk-hs.bigdata.svc.cluster.local

查看配置:

[root@k8s-master sts]# kubectl exec zk-0 -n bigdata -- cat /opt/zookeeper/conf/zoo.cfg
#This file was autogenerated DO NOT EDIT
clientPort=2181
dataDir=/var/lib/zookeeper/data
dataLogDir=/var/lib/zookeeper/data/log
tickTime=2000
initLimit=10
syncLimit=5
maxClientCnxns=60
minSessionTimeout=4000
maxSessionTimeout=40000
autopurge.snapRetainCount=3
autopurge.purgeInteval=12
server.1=zk-0.zk-hs.bigdata.svc.cluster.local:2888:3888
server.2=zk-1.zk-hs.bigdata.svc.cluster.local:2888:3888
server.3=zk-2.zk-hs.bigdata.svc.cluster.local:2888:3888
[root@k8s-master sts]# 

测试zookeeper集群整体性:

在zk-1节点写入数据并查看

[root@k8s-master sts]# kubectl exec -ti zk-1 -n bigdata -- bash 
zookeeper@zk-1:/$ zkCli.sh 
Connecting to localhost:2181
[zk: localhost:2181(CONNECTED) 0] create /hello world
Created /hello
[zk: localhost:2181(CONNECTED) 1] get /hello
world
cZxid = 0x100000004
ctime = Wed Nov 13 02:41:56 UTC 2019
mZxid = 0x100000004
mtime = Wed Nov 13 02:41:56 UTC 2019
pZxid = 0x100000004
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 5
numChildren = 0
[zk: localhost:2181(CONNECTED) 2] 

在其他节点查看数据是否同步:

比如在zk-0节点查看数据:

[root@k8s-master sts]# kubectl exec -ti zk-0 -n bigdata -- bash 
zookeeper@zk-0:/$ zkCli.sh 
Connecting to localhost:2181
[zk: localhost:2181(CONNECTED) 0] ls /
[hello, zookeeper]
[zk: localhost:2181(CONNECTED) 1] ls /hello
[]
[zk: localhost:2181(CONNECTED) 2] get /hello
world
cZxid = 0x100000004
ctime = Wed Nov 13 02:41:56 UTC 2019
mZxid = 0x100000004
mtime = Wed Nov 13 02:41:56 UTC 2019
pZxid = 0x100000004
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 5
numChildren = 0
[zk: localhost:2181(CONNECTED) 3] 

具体使用:

将应用接入zookeeper集群

部署kafka集群

创建pv

[root@k8s-master sts]# cat kafka-pv.yaml 
kind: PersistentVolume
apiVersion: v1
metadata:
  name: pv-kafka1
  namespace: bigdata
  annotations:
    volume.beta.kubernetes.io/storage-class: "anything"
  labels:
    type: local
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/data/kafka1"
  persistentVolumeReclaimPolicy: Recycle
---
kind: PersistentVolume
apiVersion: v1
metadata:
  name: pv-kafka2
  namespace: bigdata
  annotations:
    volume.beta.kubernetes.io/storage-class: "anything"
  labels:
    type: local
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/data/kafka2"
  persistentVolumeReclaimPolicy: Recycle
---
kind: PersistentVolume
apiVersion: v1
metadata:
  name: pv-kafka3
  namespace: bigdata
  annotations:
    volume.beta.kubernetes.io/storage-class: "anything"
  labels:
    type: local
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/data/kafka3"
  persistentVolumeReclaimPolicy: Recycle
[root@k8s-master sts]# 

创建kafka StatefulSet

[root@k8s-master sts]# cat kafka-sts.yaml 
---
apiVersion: v1
kind: Service
metadata:
  name: kafka-hs
  namespace: bigdata
  labels:
    app: kafka
spec:
  ports:
  - port: 9093
    name: server
  clusterIP: None
  selector:
    app: kafka
---
apiVersion: policy/v1beta1
kind: PodDisruptionBudget
metadata:
  name: kafka-pdb
  namespace: bigdata
spec:
  selector:
    matchLabels:
      app: kafka
  maxUnavailable: 1
---
apiVersion: apps/v1beta1
kind: StatefulSet
metadata:
  name: kafka
  namespace: bigdata
spec:
  serviceName: kafka-hs
  replicas: 3
  podManagementPolicy: Parallel
  updateStrategy:
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: kafka
    spec:
      terminationGracePeriodSeconds: 300
      containers:
      - name: k8skafka
        imagePullPolicy: IfNotPresent
        image: mirrorgooglecontainers/kubernetes-kafka:1.0-10.2.1
        resources:
          requests:
            memory: "256Mi"
            cpu: "0.1"
        ports:
        - containerPort: 9093
          name: server
        command:
        - sh
        - -c
        - "exec kafka-server-start.sh /opt/kafka/config/server.properties --override broker.id=${HOSTNAME##*-} 
          --override listeners=PLAINTEXT://:9093 
          --override zookeeper.connect=zk-cs.bigdata.svc.cluster.local:2181 
          --override log.dir=/var/lib/kafka 
          --override auto.create.topics.enable=true 
          --override auto.leader.rebalance.enable=true 
          --override background.threads=10 
          --override compression.type=producer 
          --override delete.topic.enable=false 
          --override leader.imbalance.check.interval.seconds=300 
          --override leader.imbalance.per.broker.percentage=10 
          --override log.flush.interval.messages=9223372036854775807 
          --override log.flush.offset.checkpoint.interval.ms=60000 
          --override log.flush.scheduler.interval.ms=9223372036854775807 
          --override log.retention.bytes=-1 
          --override log.retention.hours=168 
          --override log.roll.hours=168 
          --override log.roll.jitter.hours=0 
          --override log.segment.bytes=1073741824 
          --override log.segment.delete.delay.ms=60000 
          --override message.max.bytes=1000012 
          --override min.insync.replicas=1 
          --override num.io.threads=8 
          --override num.network.threads=3 
          --override num.recovery.threads.per.data.dir=1 
          --override num.replica.fetchers=1 
          --override offset.metadata.max.bytes=4096 
          --override offsets.commit.required.acks=-1 
          --override offsets.commit.timeout.ms=5000 
          --override offsets.load.buffer.size=5242880 
          --override offsets.retention.check.interval.ms=600000 
          --override offsets.retention.minutes=1440 
          --override offsets.topic.compression.codec=0 
          --override offsets.topic.num.partitions=50 
          --override offsets.topic.replication.factor=3 
          --override offsets.topic.segment.bytes=104857600 
          --override queued.max.requests=500 
          --override quota.consumer.default=9223372036854775807 
          --override quota.producer.default=9223372036854775807 
          --override replica.fetch.min.bytes=1 
          --override replica.fetch.wait.max.ms=500 
          --override replica.high.watermark.checkpoint.interval.ms=5000 
          --override replica.lag.time.max.ms=10000 
          --override replica.socket.receive.buffer.bytes=65536 
          --override replica.socket.timeout.ms=30000 
          --override request.timeout.ms=30000 
          --override socket.receive.buffer.bytes=102400 
          --override socket.request.max.bytes=104857600 
          --override socket.send.buffer.bytes=102400 
          --override unclean.leader.election.enable=true 
          --override zookeeper.session.timeout.ms=6000 
          --override zookeeper.set.acl=false 
          --override broker.id.generation.enable=true 
          --override connections.max.idle.ms=600000 
          --override controlled.shutdown.enable=true 
          --override controlled.shutdown.max.retries=3 
          --override controlled.shutdown.retry.backoff.ms=5000 
          --override controller.socket.timeout.ms=30000 
          --override default.replication.factor=1 
          --override fetch.purgatory.purge.interval.requests=1000 
          --override group.max.session.timeout.ms=300000 
          --override group.min.session.timeout.ms=6000 
          --override inter.broker.protocol.version=0.10.2-IV0 
          --override log.cleaner.backoff.ms=15000 
          --override log.cleaner.dedupe.buffer.size=134217728 
          --override log.cleaner.delete.retention.ms=86400000 
          --override log.cleaner.enable=true 
          --override log.cleaner.io.buffer.load.factor=0.9 
          --override log.cleaner.io.buffer.size=524288 
          --override log.cleaner.io.max.bytes.per.second=1.7976931348623157E308 
          --override log.cleaner.min.cleanable.ratio=0.5 
          --override log.cleaner.min.compaction.lag.ms=0 
          --override log.cleaner.threads=1 
          --override log.cleanup.policy=delete 
          --override log.index.interval.bytes=4096 
          --override log.index.size.max.bytes=10485760 
          --override log.message.timestamp.difference.max.ms=9223372036854775807 
          --override log.message.timestamp.type=CreateTime 
          --override log.preallocate=false 
          --override log.retention.check.interval.ms=300000 
          --override max.connections.per.ip=2147483647 
          --override num.partitions=3 
          --override producer.purgatory.purge.interval.requests=1000 
          --override replica.fetch.backoff.ms=1000 
          --override replica.fetch.max.bytes=1048576 
          --override replica.fetch.response.max.bytes=10485760 
          --override reserved.broker.max.id=1000 "
        env:
        - name: KAFKA_HEAP_OPTS
          value : "-Xmx256M -Xms256M"
        - name: KAFKA_OPTS
          value: "-Dlogging.level=INFO"
        volumeMounts:
        - name: datadir
          mountPath: /var/lib/kafka
        readinessProbe:
          exec:
           command:
            - sh
            - -c
            - "/opt/kafka/bin/kafka-broker-api-versions.sh --bootstrap-server=localhost:9093"
      securityContext:
        runAsUser: 1000
        fsGroup: 1000
  volumeClaimTemplates:
  - metadata:
      name: datadir
      annotations:
        volume.beta.kubernetes.io/storage-class: "anything"

    spec:
      accessModes: [ "ReadWriteOnce" ]
      resources:
        requests:
          storage: 5Gi
[root@k8s-master sts]#

注意:修改

 --override zookeeper.connect=zk-cs.bigdata.svc.cluster.local:2181   zookeeper地址

image: mirrorgooglecontainers/kubernetes-kafka:1.0-10.2.1  镜像地址

正常情况下就跑起来了:

[root@k8s-master sts]# kubectl get pods -n bigdata
NAME      READY   STATUS    RESTARTS   AGE
kafka-0   1/1     Running   0          3m30s
kafka-1   1/1     Running   0          3m30s
kafka-2   1/1     Running   0          3m30s
zk-0      1/1     Running   0          139m
zk-1      1/1     Running   3          139m
zk-2      1/1     Running   2          139m
[root@k8s-master sts]# 

通过zookeeper查看broker:

[root@k8s-master sts]# kubectl exec -ti zk-1 -n bigdata bash
zookeeper@zk-1:/$ zkCli.sh 
Connecting to localhost:2181
[zk: localhost:2181(CONNECTED) 0] ls /
[cluster, controller, controller_epoch, brokers, zookeeper, admin, isr_change_notification, consumers, hello, config]
[zk: localhost:2181(CONNECTED) 1] ls /brokers
[ids, topics, seqid]
[zk: localhost:2181(CONNECTED) 2] ls /brokers/ids
[0, 1, 2]
[zk: localhost:2181(CONNECTED) 3] 
[zk: localhost:2181(CONNECTED) 3] get /brokers/ids/0
{"listener_security_protocol_map":{"PLAINTEXT":"PLAINTEXT"},"endpoints":["PLAINTEXT://kafka-0.kafka-hs.bigdata.svc.cluster.local:9093"],"jmx_port":-1,"host":"kafka-0.kafka-hs.bigdata.svc.cluster.local","timestamp":"1573619460916","port":9093,"version":4}
cZxid = 0x10000004b
ctime = Wed Nov 13 04:31:00 UTC 2019
mZxid = 0x10000004b
mtime = Wed Nov 13 04:31:00 UTC 2019
pZxid = 0x10000004b
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x16e628b4c0a0006
dataLength = 254
numChildren = 0
[zk: localhost:2181(CONNECTED) 4] get /brokers/ids/1
{"listener_security_protocol_map":{"PLAINTEXT":"PLAINTEXT"},"endpoints":["PLAINTEXT://kafka-1.kafka-hs.bigdata.svc.cluster.local:9093"],"jmx_port":-1,"host":"kafka-1.kafka-hs.bigdata.svc.cluster.local","timestamp":"1573619460909","port":9093,"version":4}
cZxid = 0x100000048
ctime = Wed Nov 13 04:31:00 UTC 2019
mZxid = 0x100000048
mtime = Wed Nov 13 04:31:00 UTC 2019
pZxid = 0x100000048
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x36e628b4c540004
dataLength = 254
numChildren = 0
[zk: localhost:2181(CONNECTED) 5] get /brokers/ids/2
{"listener_security_protocol_map":{"PLAINTEXT":"PLAINTEXT"},"endpoints":["PLAINTEXT://kafka-2.kafka-hs.bigdata.svc.cluster.local:9093"],"jmx_port":-1,"host":"kafka-2.kafka-hs.bigdata.svc.cluster.local","timestamp":"1573619460932","port":9093,"version":4}
cZxid = 0x10000004e
ctime = Wed Nov 13 04:31:00 UTC 2019
mZxid = 0x10000004e
mtime = Wed Nov 13 04:31:00 UTC 2019
pZxid = 0x10000004e
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x26e628b922c0005
dataLength = 254
numChildren = 0
[zk: localhost:2181(CONNECTED) 6] 

kafka基本操作测试 

[root@k8s-master sts]# kubectl exec -it kafka-0 -n bigdata sh
$ pwd
/opt/kafka/bin
#创建test topic
$  ./kafka-topics.sh --create --topic test --zookeeper zk-cs.bigdata.svc.cluster.local:2181    --partitions 3 --replication-factor 3
Created topic "test".
#查看topic
$ ./kafka-topics.sh --zookeeper zk-cs.bigdata.svc.cluster.local:2181 --list
test
$ 

##模拟生产者,消费者

#生产者
$  ./kafka-console-producer.sh --topic test --broker-list kafka-0.kafka-hs.bigdata.svc.cluster.local:9093,kafka-1.kafka-hs.bigdata.svc.cluster.local:9093,kafka-2.kafka-hs.bigdata.svc.cluster.local:9093
this is a test message
hell world
#消费者消费数据
$  ./kafka-console-consumer.sh --topic test --zookeeper zk-cs.bigdata.svc.cluster.local:2181 --from-beginning
Using the ConsoleConsumer with old consumer is deprecated and will be removed in a future major release. Consider using the new consumer by passing [bootstrap-server] instead of [zookeeper].
hell world
this is a test message

具体业务接入kafka示例:

k8s集群内部域名:

broker-list:kafka-0.kafka-hs.bigdata.svc.cluster.local:9093,kafka-1.kafka-hs.bigdata.svc.cluster.local:9093,kafka-2.kafka-hs.bigdata.svc.cluster.local:9093
zookeeper:zk-cs.bigdata.svc.cluster.local:2181

k8s集群外部域名:

broker-list:

zookeeper:

通过nodeport:

zk:

apiVersion: v1
kind: Service
metadata:
  name: zk-cs
  namespace: bigdata
  labels:
    app: zk
spec:
  type: NodePort
  ports:
  - port: 2181
    targetPort: 2181
    name: client
    nodePort: 32181
  selector:
    app: zk

外网访问:

 ./bin/zkCli.sh -server 192.168.100.102:32181

[zk: 192.168.100.102:32181(CONNECTED) 1] ls /
[cluster, controller_epoch, brokers, zookeeper, admin, isr_change_notification, consumers, hello, config]
[zk: 192.168.100.102:32181(CONNECTED) 2] get /hello  
world
cZxid = 0x100000004
ctime = Wed Nov 13 10:41:56 CST 2019
mZxid = 0x100000004
mtime = Wed Nov 13 10:41:56 CST 2019
pZxid = 0x100000004
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 5
numChildren = 0
[zk: 192.168.100.102:32181(CONNECTED) 3] 
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