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: 3Gi accessModes: - ReadWriteOnce nfs: server: nfs.wego.red path: /vdc/kafka/data1 --- apiVersion: v1 kind: PersistentVolume metadata: name: kafka-data2 spec: capacity: storage: 3Gi accessModes: - ReadWriteOnce nfs: server: nfs.wego.red path: /vdc/kafka/data2 --- apiVersion: v1 kind: PersistentVolume metadata: name: kafka-data3 spec: capacity: storage: 3Gi accessModes: - ReadWriteOnce nfs: server: nfs.wego.red path: /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-hs
namespace: default
labels:
app: kafka
spec:
ports:
- port: 9093
name: server
clusterIP: None
selector:
app: kafka
---
apiVersion: policy/v1beta1
kind: PodDisruptionBudget
metadata:
name: kafka-pdb
namespace: default
spec:
selector:
matchLabels:
app: kafka
maxUnavailable: 1
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: kafka
namespace: default
spec:
serviceName: kafka-hs
replicas: 3
selector:
matchLabels:
app: kafka
podManagementPolicy: Parallel
updateStrategy:
type: RollingUpdate
template:
metadata:
labels:
app: kafka
spec:
terminationGracePeriodSeconds: 300
containers:
- name: k8skafka
imagePullPolicy: IfNotPresent
image: harbor.wego.red/library/kubernetes-kafka:v10.2.1
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.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_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"
volumeClaimTemplates:
- metadata:
name: datadir
spec:
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: k8skafka
imagePullPolicy: IfNotPresent
image: 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 world CTRL+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:9093 kafka-1.kafka-hs.default.svc.cluster.local:9093 kafka-2.kafka-hs.default.svc.cluster.local:9093
