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kubernetes集群 应用实践 kafka部署

零.1、环境说明

零.2、kafka架构说明

zookeeper在kafka集群中的作用

一、Broker注册

二、Topic注册

三、Topic Partition选主

四、生产者负载均衡

五、消费者负载均衡

一、持久化存储资源准备

1.1 创建共享目录

[root@nfsserver ~]# mkdir -p /vdc/kafka/data1
[root@nfsserver ~]# mkdir -p /vdc/kafka/data2
[root@nfsserver ~]# mkdir -p /vdc/kafka/data3

1.2 验证共享目录

[root@nfsserver ~]# tree /vdc/kafka
/vdc/kafka
├── data1
├── data2
└── data3
​
3 directories, 0 files

1.3 共享存储目录

[root@nfsserver ~]# cat /etc/exports
/vdc/zk/data1   *(rw,sync,no_root_squash)
/vdc/zk/data2   *(rw,sync,no_root_squash)
/vdc/zk/data3   *(rw,sync,no_root_squash)
/vdc/kafka/data1        *(rw,sync,no_root_squash)
/vdc/kafka/data2        *(rw,sync,no_root_squash)
/vdc/kafka/data3        *(rw,sync,no_root_squash)

[root@nfsserver ~]# exportfs -a

[root@nfsserver ~]# showmount -e 192.168.122.250
Export list for 192.168.122.250:
/vdc/kafka/data3 *
/vdc/kafka/data2 *
/vdc/kafka/data1 *
/vdc/zk/data3    *
/vdc/zk/data2    *
/vdc/zk/data1    *

二、k8s集群中kafka持久化存储PV准备

2.1 创建PV资源清单文件

[root@nginxk8syaml kafka]# cat kafka-pv.yaml
apiVersion: v1
kind: PersistentVolume
metadata:name: kafka-data1
spec:capacity:storage: 3GiaccessModes:- ReadWriteOncenfs:server: nfs.wego.redpath: /vdc/kafka/data1
---
apiVersion: v1
kind: PersistentVolume
metadata:name: kafka-data2
spec:capacity:storage: 3GiaccessModes:- ReadWriteOncenfs:server: nfs.wego.redpath: /vdc/kafka/data2
---
apiVersion: v1
kind: PersistentVolume
metadata:name: kafka-data3
spec:capacity:storage: 3GiaccessModes:- ReadWriteOncenfs:server: nfs.wego.redpath: /vdc/kafka/data3

2.2 定位资源清单文件位置

2.3 应用资源清单文件

[root@master1 ~]# kubectl apply -f http://nginxk8syaml.k8sonline.com.cn/kafka/kafka-pv.yaml
persistentvolume/kafka-data1 created
persistentvolume/kafka-data2 created
persistentvolume/kafka-data3 created

2.4 验证PV创建情况

[root@master1 ~]# kubectl get pv
NAME                                       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS      CLAIM                                            STORAGECLASS          REASON   AGE
kafka-data1                                3Gi        RWO            Retain           Available                                                                                   19s
kafka-data2                                3Gi        RWO            Retain           Available                                                                                   19s
kafka-data3                                3Gi        RWO            Retain           Available                                                                                   19s

三、k8s集群中部署kafka

3.1 kafka资源清单文件

[root@nginxk8syaml kafka]# cat kafka.yaml
---
apiVersion: v1
kind: Service
metadata:name: kafka-hsnamespace: defaultlabels:app: kafka
spec:ports:- port: 9093name: serverclusterIP: Noneselector:app: kafka
---
apiVersion: policy/v1beta1
kind: PodDisruptionBudget
metadata:name: kafka-pdbnamespace: default
spec:selector:matchLabels:app: kafkamaxUnavailable: 1
---
apiVersion: apps/v1
kind: StatefulSet
metadata:name: kafkanamespace: default
spec:serviceName: kafka-hsreplicas: 3selector:matchLabels:app: kafkapodManagementPolicy: ParallelupdateStrategy:type: RollingUpdatetemplate:metadata:labels:app: kafkaspec:terminationGracePeriodSeconds: 300containers:- name: k8skafkaimagePullPolicy: IfNotPresentimage: harbor.wego.red/library/kubernetes-kafka:v10.2.1resources:requests:memory: "256Mi"cpu: "0.1"ports:- containerPort: 9093name: servercommand:- 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.default.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_OPTSvalue : "-Xmx256M -Xms256M"- name: KAFKA_OPTSvalue: "-Dlogging.level=INFO"volumeMounts:- name: datadirmountPath: /var/lib/kafkareadinessProbe:exec:command:- sh- -c- "/opt/kafka/bin/kafka-broker-api-versions.sh --bootstrap-server=localhost:9093"volumeClaimTemplates:- metadata:name: datadirspec:accessModes: [ "ReadWriteOnce" ]resources:requests:storage: 3Gi

3.1.1 修改容器镜像

在课程目录中有相关镜像，直接导入harbor主机并上传到harbor仓库

修改容器镜像
containers:- name: k8skafkaimagePullPolicy: IfNotPresentimage: harbor.wego.red/library/kubernetes-kafka:v10.2.1

3.1.2 修改zookeeper连接地址

修改zookeeper.connect连接地址，使用k8s集群内域名，需要DNS服务。
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.default.svc.cluster.local:2181 \

3.2 应用kafka资源清单文件

[root@master1 ~]# kubectl apply  -f http://nginx.wego.red/kafka/kafka.yaml
service/kafka-hs created
poddisruptionbudget.policy/kafka-pdb created
statefulset.apps/kafka created

3.3 验证kafka创建情况

[root@master1 ~]# kubectl get pods
NAME                                      READY   STATUS    RESTARTS   AGE
busybox-pod                               1/1     Running   397        28d
kafka-0                                   1/1     Running   0          106s
kafka-1                                   1/1     Running   0          106s
kafka-2                                   1/1     Running   0          106s
nfs-client-provisioner-5786f95795-54v4s   1/1     Running   4          9d
zok-0                                     1/1     Running   2          3h38m
zok-1                                     1/1     Running   1          3h38m
zok-2                                     1/1     Running   1          3h37m

四、通过zookeeper查看broker

[root@master1 ~]# kubectl get pods
NAME                                      READY   STATUS    RESTARTS   AGE
zok-0                                     1/1     Running   2          5h4m
zok-1                                     1/1     Running   1          5h3m
zok-2                                     1/1     Running   1          5h3m

[root@master1 ~]# kubectl exec -it zok-1 -n default bash
root@zok-1:/# zkCli.sh
Connecting to localhost:2181
Welcome to ZooKeeper![zk: localhost:2181(CONNECTING) 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] get /brokers/ids/0
{"listener_security_protocol_map":{"PLAINTEXT":"PLAINTEXT"},"endpoints":["PLAINTEXT://kafka-0.kafka-hs.default.svc.cluster.local:9093"],"jmx_port":-1,"host":"kafka-0.kafka-hs.default.svc.cluster.local","timestamp":"1581591232561","port":9093,"version":4}
cZxid = 0x20000001a
ctime = Thu Feb 13 10:53:52 UTC 2020
mZxid = 0x20000001a
mtime = Thu Feb 13 10:53:52 UTC 2020
pZxid = 0x20000001a
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x1703e20e92c0000
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.default.svc.cluster.local:9093"],"jmx_port":-1,"host":"kafka-1.kafka-hs.default.svc.cluster.local","timestamp":"1581591238213","port":9093,"version":4}
cZxid = 0x20000001e
ctime = Thu Feb 13 10:53:58 UTC 2020
mZxid = 0x20000001e
mtime = Thu Feb 13 10:53:58 UTC 2020
pZxid = 0x20000001e
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x1703e20e92c0001
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.default.svc.cluster.local:9093"],"jmx_port":-1,"host":"kafka-2.kafka-hs.default.svc.cluster.local","timestamp":"1581591242262","port":9093,"version":4}
cZxid = 0x200000022
ctime = Thu Feb 13 10:54:02 UTC 2020
mZxid = 0x200000022
mtime = Thu Feb 13 10:54:02 UTC 2020
pZxid = 0x200000022
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x2703e207a150000
dataLength = 254
numChildren = 0

五、kafka应用操作测试

5.1 查看pod

[root@master1 ~]# kubectl get pods
NAME                                      READY   STATUS    RESTARTS   AGE
busybox-pod                               1/1     Running   398        28d
kafka-0                                   1/1     Running   0          87m
kafka-1                                   1/1     Running   0          87m
kafka-2                                   1/1     Running   0          87m

5.2 进入kafka pod

[root@master1 ~]# kubectl exec -it kafka-0 -n default bash
# pwd
/
# ls
KEYS  boot  etc   lib    media  opt   root  sbin  sys  usr
bin   dev   home  lib64  mnt    proc  run   srv   tmp  var
# cd /opt/kafka/bin
# pwd
/opt/kafka/bin
# ls
connect-distributed.sh               kafka-replica-verification.sh
connect-standalone.sh                kafka-run-class.sh
kafka-acls.sh                        kafka-server-start.sh
kafka-broker-api-versions.sh         kafka-server-stop.sh
kafka-configs.sh                     kafka-simple-consumer-shell.sh
kafka-console-consumer.sh            kafka-streams-application-reset.sh
kafka-console-producer.sh            kafka-topics.sh
kafka-consumer-groups.sh             kafka-verifiable-consumer.sh
kafka-consumer-offset-checker.sh     kafka-verifiable-producer.sh
kafka-consumer-perf-test.sh          windows
kafka-mirror-maker.sh                zookeeper-security-migration.sh
kafka-preferred-replica-election.sh  zookeeper-server-start.sh
kafka-producer-perf-test.sh          zookeeper-server-stop.sh
kafka-reassign-partitions.sh         zookeeper-shell.sh
kafka-replay-log-producer.sh

5.3 创建test topic

root@kafka-0:/opt/kafka/bin# ./kafka-topics.sh --create --topic test --zookeeper zk-cs.default.svc.cluster.local:2181    --partitions 3 --replication-factor 3

输出
Created topic "test".

5.4 查看 topic

root@kafka-0:/opt/kafka/bin# ./kafka-topics.sh --zookeeper zk-cs.default.svc.cluster.local:2181 --list

输出
test

5.5 模拟生产者

终端1

root@kafka-0:/opt/kafka/bin# ./kafka-console-producer.sh --topic test --broker-list kafka-0.kafka-hs.default.svc.cluster.local:9093,kafka-1.kafka-hs.default.svc.cluster.local:9093,kafka-2.kafka-hs.default.svc.cluster.local:9093
this is a test message
hello worldCTRL+C即可退出

5.6 模拟消费者

终端2

[root@master1 ~]# kubectl exec -it kafka-0 bash
root@kafka-0:/# cd /opt/kafka/bin
root@kafka-0:/opt/kafka/bin# ./kafka-console-consumer.sh --topic test --zookeeper zk-cs.default.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].
this is a test message
hello world

六、集群内业务系统访问kafka

broker-list:kafka-0.kafka-hs.default.svc.cluster.local:9093kafka-1.kafka-hs.default.svc.cluster.local:9093kafka-2.kafka-hs.default.svc.cluster.local:9093