Apache SeaTunnel k8s 集群模式 Zeta 引擎部署指南

SeaTunnel提供了一种运行Zeta引擎(cluster-mode)的方法，可以让Kubernetes在本地运行Zeta引擎，实现更高效的应用程序部署和管理。在本文中，我们将探索SeaTunnel k8s运行zeta引擎(cluster-mode模式)的更多信息，了解如何更好地利用Zeta引擎的优势。

将SeaTunnel上传至服务器上。我之前已经解压并执行过install-plugin.sh，这里为了方便，我直接用的执行过install-plugin.sh脚本之后的seatunnel做演示。

执行过install-plugin后的lib目录包含如下：

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tar -zxvf apache-seatunnel-2.3.3-bin.tar.gz
sh apache-seatunnel-2.3.3/bin/install-plugin.sh
tar -czvf  apache-seatunnel-2.3.3-bin.tar.gz  apache-seatunnel-2.3.3

构建seatunnel镜像。在安装seatunnel的同级文件夹下创建Dockerfile。配置如下，可自行选择版本：

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FROM openjdk:8
ENV SEATUNNEL_HOME="/opt/seatunnel"
ENV SEATUNNEL_VERSION="2.3.3"
COPY /apache-seatunnel-${SEATUNNEL_VERSION}-bin.tar.gz /opt/apache-seatunnel-${SEATUNNEL_VERSION}-bin.tar.gz
WORKDIR /opt
RUN tar -xzvf apache-seatunnel-${SEATUNNEL_VERSION}-bin.tar.gz
RUN mv apache-seatunnel-${SEATUNNEL_VERSION} seatunnel
RUN rm -f /opt/apache-seatunnel-${SEATUNNEL_VERSION}-bin.tar.gz
WORKDIR /opt/seatunnel

执行命令

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docker build -t seatunnel:2.3.3 -f Dockerfile.

查看镜像

docker images

如下所示镜像

将镜像load进k8s，这里用的minikube做演示
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```
minikube image load seatunnel:2.3.3
```
上述可参考：手把手教你掌握SeaTunnel k8s运行Zeta引擎本地模式的技巧

创建configmap如下

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kubectl create configmap hazelcast-client  --from-file= config/hazelcast-client.yaml
kubectl create configmap hazelcast  --from-file=config/hazelcast.yaml
kubectl create configmap seatunnelmap  --from-file=config/seatunnel.yaml

使用Reloader实现更新configmap后自动重启pod

wget https://raw.githubusercontent.com/stakater/Reloader/master/deployments/kubernetes/reloader.yaml

kubectl apply -f reloader.yaml

创建seatunnel-cluster.yml如下

apiVersion: v1
kind: Service
metadata:
name: seatunnel
spec:
selector:
app: seatunnel
ports:
- port: 5801
  name: seatunnel
  clusterIP: None
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: seatunnel
annotations:
configmap.reloader.stakater.com/reload: "hazelcast,hazelcast-client,seatunnelmap"
spec:
serviceName: "seatunnel"
replicas: 3
selector:
matchLabels:
app: seatunnel
template:
metadata:
labels:
app: seatunnel
spec:
containers:
- name: seatunnel
image: seatunnel:2.3.3
imagePullPolicy: IfNotPresent
ports:
- containerPort: 5801
name: client
command: ["/bin/sh","-c","/opt/seatunnel/bin/seatunnel-cluster.sh -DJvmOption=-Xms2G -Xmx2G"]
resources:
limits:
cpu: "1"
memory: 4G
requests:
cpu: "1"
memory: 2G
volumeMounts:
- mountPath: "/opt/seatunnel/config/hazelcast.yaml"
name: hazelcast
subPath: hazelcast.yaml
- mountPath: "/opt/seatunnel/config/hazelcast-client.yaml"
name: hazelcast-client
subPath: hazelcast-client.yaml
- mountPath: "/opt/seatunnel/config/seatunnel.yaml"
name: seatunnelmap
subPath: seatunnel.yaml
volumes:
- name: hazelcast
configMap:
name: hazelcast
- name: hazelcast-client
configMap:
name: hazelcast-client
- name: seatunnelmap
configMap:
name: seatunnelmap
执行

kubectl apply -f seatunnel-cluster.yml

修改configmap中的配置

kubectl edit cm hazelcast

修改集群地址
这里采用的是headless service访问模式
一般pod之间访问其格式为 ...svc.cluster.local

如下示例

seatunnel-0.seatunnel.default.svc.cluster.local
seatunnel-1.seatunnel.default.svc.cluster.local
seatunnel-2.seatunnel.default.svc.cluster.local

友情提示：不要用tab，用空格。不然会报错

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kubectl edit cm hazelcast-client

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kubectl edit cm seatunnelmap

此处改为自己的hdfs地址。

可以看到如下

待所有节点都更新完毕处于running状态后可进入容器内查看路径是否已修改

kubectl exec -it seatunnel-0 /bin/bash
cat config/hazelcast.yaml

在容器内查看日志

tail -200f logs/seatunnel-engine-server.log

我们发现集群已经正常运行.

运行任务

我们可以再新打开一个连接，登录另一个pod节点执行任务来测试集群：

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kubectl exec -it seatunnel-1 /bin/bash

bin/seatunnel.sh --config config/v2.streaming.conf.template

我们发现其他pod内也已经开始运行任务

原文链接：https://blog.csdn.net/weixin_41854429/article/details/132836402

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