如何在 Kubernetes 上运行 Jenkins 和 Docker？
[英]How to run Jenkins with Docker on Kubernetes?
问题描述
I'm attempting to execute a Jenkins & Docker CLI container on Kubernetes.
我正在尝试在 Kubernetes 上执行 Jenkins 和 Docker CLI 容器。 Here are my steps:这是我的步骤：
I create the pod using:我使用以下方法创建 pod：
kubectl --kubeconfig my-kubeconfig.yml run my-jenkins-pod --image=trion/jenkins-docker-client --restart=Never
Which creates a pod-based on the image https://hub.docker.com/r/trion/jenkins-docker-client它基于图像https://hub.docker.com/r/trion/jenkins-docker-client创建一个 pod
I create the deployment using:我使用以下方法创建部署：
kubectl --kubeconfig my-kubeconfig.yml apply -f /kub/kube
/kub/kube contains jenkins-deployment-yaml which I have configured as: /kub/kube包含我已配置为jenkins-deployment-yaml ：
apiVersion: v1
kind: Service
metadata:
name: my-jenkins-pod
spec:
ports:
- protocol: "TCP"
port: 50000
targetPort: 5001
selector:
app: my-jenkins-pod
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: my-jenkins-pod
spec:
selector:
matchLabels:
app: my-jenkins-pod
replicas: 1
template:
metadata:
labels:
app: my-jenkins-pod
spec:
containers:
- name: ml-services
image: trion/jenkins-docker-client
ports:
- containerPort: 5001
To access the Jenkins container I expose the IP using:要访问 Jenkins 容器，我使用以下方法公开 IP：
kubectl --kubeconfig my-kubeconfig.yml expose deployment my-jenkins-pod --type=LoadBalancer --name=my-jenkins-pod-public
To return the IP of the Jenkins and Docker image I use:要返回 Jenkins 和 Docker 图像的 IP，我使用：
kubectl --kubeconfig my-kubeconfig.yml get services my-jenkins-pod-public
Which returns:返回：
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
my-jenkins-pod-public LoadBalancer 9.5.52.28 161.61.222.16 5001:30878/TCP 10m
To test I open the URL at location:为了测试，我在以下位置打开 URL：
http://161.61.222.16:5001/ http://161.61.222.16:5001/
Which returns:返回：
This page isn’t working
161.61.222.16 didn’t send any data.
ERR_EMPTY_RESPONSE
It seems the service has started but the port mappings are incorrect?服务好像已经启动了，但是端口映射不正确？
The log of the pod my-jenkins-pod contains: pod my-jenkins-pod 的日志包含：
Running from: /usr/share/jenkins/jenkins.war webroot: EnvVars.masterEnvVars.get("JENKINS_HOME") 2021-04-03 11:15:42.899+0000 [id=1] INFO org.eclipse.jetty.util.log.Log#initialized: Logging initialized @274ms to org.eclipse.jetty.util.log.JavaUtilLog 2021-04-03 11:15:43.012+0000 [id=1] INFO winstone.Logger#logInternal: Beginning extraction from war file 2021-04-03 11:15:44.369+0000 [id=1] WARNING oejshandler.ContextHandler#setContextPath: Empty contextPath 2021-04-03 11:15:44.416+0000 [id=1] INFO org.eclipse.jetty.server.Server#doStart: jetty-9.4.39.v20210325;
************************************************************* Jenkins initial setup is required.
************************************************************* 2021-04-03 11:16:08.107+0000 [id=27] INFO jenkins.InitReactorRunner$1#onAttained: Completed initialization 2021-04-03 11:16:08.115+0000 [id=20] INFO hudson.WebAppMain$3#run: Jenkins is fully up and running 2021-04-03 11:16:08.331+0000 [id=40] INFO hmDownloadService$Downloadable#load: Obtained the updated data file for hudson.tasks.Maven.MavenInstaller 2021-04-03 11:16:08.332+0000 [id=40] INFO hudson.util.Retrier#start: Performed the action check updates server successfully at the attempt #1 2021-04-03 11:16:08.334+0000 [id=40] INFO hudson.model.AsyncPeriodicWork#lambda$doRun$0: Finished Download metadata.
Is Jenkins server is started at port 8080? Jenkins 服务器是否在 8080 端口启动？ because of this log message:由于此日志消息：
11:15:45.241+0000 [id=1] INFO oejserver.AbstractConnector#doStart: Started ServerConnector@4f0f2942{HTTP/1.1, (http/1.1)}{0.0.0.0:8080} 2021-04-03
I tried changing jenkins-deployment-yaml to point at port 8080 instead of 50000 , resulting in the updated jenkins-deployment-yaml :我尝试将jenkins-deployment-yaml更改为指向端口8080而不是50000 ，从而导致更新的jenkins-deployment-yaml ：
apiVersion: v1
kind: Service
metadata:
name: my-jenkins-pod
spec:
ports:
- protocol: "TCP"
port: 8080
But the same error is returned when I attempt to access http://161.61.222.16:5001/但是当我尝试访问http://161.61.222.16:5001/时返回相同的错误
Are my port mappings incorrect?我的端口映射不正确吗？ Is this a correct method of adding an existing docker container that is available on the docker hub to a Kubernetes cluster?这是将 docker 集线器上可用的现有 docker 容器添加到 Kubernetes 集群的正确方法吗？
Update:更新：
The result of command kubectl describe services my-jenkins-pod-public is:命令kubectl describe services my-jenkins-pod-public的结果是：
Name: my-jenkins-pod-public
Namespace: default
Labels: <none>
Annotations: kubernetes.digitalocean.com/load-balancer-id: d46ae9ae-6e8a-4fd8-aa58-43c08310059a
Selector: app=my-jenkins-pod
Type: LoadBalancer
IP Families: <none>
IP: 10.245.152.228
IPs: 10.245.152.228
LoadBalancer Ingress: 161.61.222.16
Port: <unset> 5001/TCP
TargetPort: 5001/TCP
NodePort: <unset> 30878/TCP
Endpoints: 10.214.12.12:5001
Session Affinity: None
External Traffic Policy: Cluster
Events: <none>
Trying to access http://161.61.222.16:30878/ via browser returns:尝试通过浏览器访问http://161.61.222.16:30878/返回：
This site can't be reached159.65.211.46 refused to connect.
Checking the connection Checking the proxy and the firewall ERR_CONNECTION_REFUSED
Trying to access http://161.61.222.16:5001/ via browser returns:尝试通过浏览器访问http://161.61.222.16:5001/返回：
This page isn't working 161.61.222.16 didn't send any data.
Seems the port 5001 is exposed/accessible but is not sending any data.似乎端口5001已公开/可访问，但未发送任何数据。
I also tried accessing 10.214.12.12 on ports 5001 & 30878 but both requests time out.我还尝试在端口5001和30878上访问10.214.12.12 ，但两个请求都超时。
1 个解决方案
解决方案1
2 已采纳 2021-04-03 12:14:18
You need to use http://161.61.222.16:30878/ from outside of the host which is running containers on.您需要从运行容器的主机外部使用http://161.61.222.16:30878/ 。 Port 5001 is just accessible inside the cluster with internal IP (9.5.52.28 is in your case).端口 5001 只能在集群内部使用内部 IP 访问（在您的情况下为 9.5.52.28）。 Whenever you expose your deployment, automatically (also you can define manually) one of the NodePort (by default between 30000 - 32767)assign to the service for external request.每当您公开您的部署时，会自动（也可以手动定义）其中一个 NodePort（默认情况下在 30000 - 32767 之间）分配给服务以进行外部请求。
For service details, you need to run the below command.有关服务详细信息，您需要运行以下命令。 The command output will give you NodePort and another details.命令 output 将为您提供 NodePort 和其他详细信息。
kubectl describe services my-service
Please check related kubernetes documentation请查看相关 kubernetes 文档
Also you have configured service with port 5001 but Jenkins working with 8080 as far as I see in logs.此外，据我在日志中看到的，您还使用端口 5001 配置了服务，但 Jenkins 使用 8080。 Try to change target port of service to 8080 from 5001尝试将目标服务端口从 5001 更改为 8080
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