我已将https://github.com/confluentinc/cp-helm-charts/tree/master/charts/cp-kafka部署在prek k8s群集上。 我正在尝试使用带有nginx的TCP控制器公开它。
我的TCP nginx configmap看起来像
data:
"<zookeper-tcp-port>": <namespace>/cp-zookeeper:2181
"<kafka-tcp-port>": <namespace>/cp-kafka:9092
我已经在我的nginx入口控制器中输入了相应的条目
- name: <zookeper-tcp-port>-tcp
port: <zookeper-tcp-port>
protocol: TCP
targetPort: <zookeper-tcp-port>-tcp
- name: <kafka-tcp-port>-tcp
port: <kafka-tcp-port>
protocol: TCP
targetPort: <kafka-tcp-port>-tcp
现在,我正在尝试连接到我的kafka实例。 当我尝试使用kafka工具连接到IP和端口时,出现错误消息
Unable to determine broker endpoints from Zookeeper.
One or more brokers have multiple endpoints for protocol PLAIN...
Please proved bootstrap.servers value in advanced settings
[<cp-broker-address-0>.cp-kafka-headless.<namespace>:<port>][<ip>]
输入后,我假设是正确的经纪人地址(我已经尝试了所有...),我超时了。没有来自nginx控制器excep的日志
[08/Apr/2020:15:51:12 +0000]TCP200000.000
[08/Apr/2020:15:51:12 +0000]TCP200000.000
[08/Apr/2020:15:51:14 +0000]TCP200000.001
我从kafka-zookeeper-0
的吊舱中获取
[2020-04-08 15:52:02,415] INFO Accepted socket connection from /<ip:port> (org.apache.zookeeper.server.NIOServerCnxnFactory)
[2020-04-08 15:52:02,415] WARN Unable to read additional data from client sessionid 0x0, likely client has closed socket (org.apache.zookeeper.server.NIOServerCnxn)
[2020-04-08 15:52:02,415] INFO Closed socket connection for client /<ip:port> (no session established for client) (org.apache.zookeeper.server.NIOServerCnxn)
尽管我不确定它们是否与此有关?
关于我在做什么错的任何想法? 提前致谢。
答案 0 :(得分:1)
TL; DR:
nodeport.enabled
内的值true
更改为cp-kafka/values.yaml
。bootstrap-server
设置为<Cluster_External_IP>:31090
说明:
Headless Service与StatefulSet一起创建。 不会为创建的服务提供
clusterIP
,而是仅包含Endpoints
列表。 然后,这些Endpoints
用于生成以下形式的特定于实例的DNS记录:<StatefulSet>-<Ordinal>.<Service>.<Namespace>.svc.cluster.local
它为每个Pod创建一个DNS名称,例如:
[ root@curl:/ ]$ nslookup my-confluent-cp-kafka-headless
Server: 10.0.0.10
Address 1: 10.0.0.10 kube-dns.kube-system.svc.cluster.local
Name: my-confluent-cp-kafka-headless
Address 1: 10.8.0.23 my-confluent-cp-kafka-1.my-confluent-cp-kafka-headless.default.svc.cluster.local
Address 2: 10.8.1.21 my-confluent-cp-kafka-0.my-confluent-cp-kafka-headless.default.svc.cluster.local
Address 3: 10.8.3.7 my-confluent-cp-kafka-2.my-confluent-cp-kafka-headless.default.svc.cluster.local
我经历了很多试验和错误,直到我意识到它应该如何工作。基于您的TCP Nginx Configmap,我相信您也遇到了同样的问题。
<PortToExpose>: "<Namespace>/<Service>:<InternallyExposedPort>"
。cp-kafka:9092
,它是无头服务,也仅在内部使用,如上所述。nodeport.enabled
设置为true
:External Access Parameters。data:
"31090": default/demo-cp-kafka-0-nodeport:31090
请注意,创建的服务具有选择器statefulset.kubernetes.io/pod-name: demo-cp-kafka-0
,这是服务识别其打算连接的容器的方式。
- containerPort: 31090
hostPort: 31090
protocol: TCP
<Cluster_External_IP>:31090
复制:
-在cp-kafka/values.yaml
中编辑的代码段:
nodeport:
enabled: true
servicePort: 19092
firstListenerPort: 31090
$ helm install demo cp-helm-charts
$ kubectl get pods
NAME READY STATUS RESTARTS AGE
demo-cp-control-center-6d79ddd776-ktggw 1/1 Running 3 113s
demo-cp-kafka-0 2/2 Running 1 113s
demo-cp-kafka-1 2/2 Running 0 94s
demo-cp-kafka-2 2/2 Running 0 84s
demo-cp-kafka-connect-79689c5c6c-947c4 2/2 Running 2 113s
demo-cp-kafka-rest-56dfdd8d94-79kpx 2/2 Running 1 113s
demo-cp-ksql-server-c498c9755-jc6bt 2/2 Running 2 113s
demo-cp-schema-registry-5f45c498c4-dh965 2/2 Running 3 113s
demo-cp-zookeeper-0 2/2 Running 0 112s
demo-cp-zookeeper-1 2/2 Running 0 93s
demo-cp-zookeeper-2 2/2 Running 0 74s
$ kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
demo-cp-control-center ClusterIP 10.0.13.134 <none> 9021/TCP 50m
demo-cp-kafka ClusterIP 10.0.15.71 <none> 9092/TCP 50m
demo-cp-kafka-0-nodeport NodePort 10.0.7.101 <none> 19092:31090/TCP 50m
demo-cp-kafka-1-nodeport NodePort 10.0.4.234 <none> 19092:31091/TCP 50m
demo-cp-kafka-2-nodeport NodePort 10.0.3.194 <none> 19092:31092/TCP 50m
demo-cp-kafka-connect ClusterIP 10.0.3.217 <none> 8083/TCP 50m
demo-cp-kafka-headless ClusterIP None <none> 9092/TCP 50m
demo-cp-kafka-rest ClusterIP 10.0.14.27 <none> 8082/TCP 50m
demo-cp-ksql-server ClusterIP 10.0.7.150 <none> 8088/TCP 50m
demo-cp-schema-registry ClusterIP 10.0.7.84 <none> 8081/TCP 50m
demo-cp-zookeeper ClusterIP 10.0.9.119 <none> 2181/TCP 50m
demo-cp-zookeeper-headless ClusterIP None <none> 2888/TCP,3888/TCP 50m
$ cat nginx-tcp-configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: tcp-services
namespace: kube-system
data:
31090: "default/demo-cp-kafka-0-nodeport:31090"
$ kubectl apply -f nginx-tcp.configmap.yaml
configmap/tcp-services created
$ kubectl edit deploy nginx-ingress-controller -n kube-system
$kubectl get deploy nginx-ingress-controller -n kube-system -o yaml
{{{suppressed output}}}
ports:
- containerPort: 31090
hostPort: 31090
protocol: TCP
- containerPort: 80
name: http
protocol: TCP
- containerPort: 443
name: https
protocol: TCP
35.226.189.123
上,现在让我们尝试从群集外部进行连接。为此,我将连接到拥有迷你库的另一个VM,因此可以使用kafka-client
pod进行测试:user@minikube:~$ kubectl get pods
NAME READY STATUS RESTARTS AGE
kafka-client 1/1 Running 0 17h
user@minikube:~$ kubectl exec kafka-client -it -- bin/bash
root@kafka-client:/# kafka-console-consumer --bootstrap-server 35.226.189.123:31090 --topic demo-topic --from-beginning --timeout-ms 8000 --max-messages 1
Wed Apr 15 18:19:48 UTC 2020
Processed a total of 1 messages
root@kafka-client:/#
如您所见,我能够从外部访问kafka。
zookeeper-external-0.yaml
apiVersion: v1
kind: Service
metadata:
labels:
app: cp-zookeeper
pod: demo-cp-zookeeper-0
name: demo-cp-zookeeper-0-nodeport
namespace: default
spec:
externalTrafficPolicy: Cluster
ports:
- name: external-broker
nodePort: 31181
port: 12181
protocol: TCP
targetPort: 31181
selector:
app: cp-zookeeper
statefulset.kubernetes.io/pod-name: demo-cp-zookeeper-0
sessionAffinity: None
type: NodePort
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
demo-cp-zookeeper-0-nodeport NodePort 10.0.5.67 <none> 12181:31181/TCP 2s
data:
"31090": default/demo-cp-kafka-0-nodeport:31090
"31181": default/demo-cp-zookeeper-0-nodeport:31181
ports:
- containerPort: 31181
hostPort: 31181
protocol: TCP
pod/zookeeper-client created
user@minikube:~$ kubectl exec -it zookeeper-client -- /bin/bash
root@zookeeper-client:/# zookeeper-shell 35.226.189.123:31181
Connecting to 35.226.189.123:31181
Welcome to ZooKeeper!
JLine support is disabled
如果您有任何疑问,请在评论中告诉我!