Java 在 Kubernetes 上的 Tomcat 中部署 WAR
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Deploy WAR in Tomcat on Kubernetes
提问by Akhil Prajapati
I need to create a Multibranch Jenkins job to deploy a .war file in Tomcat that should run on Kubernetes. Basically, I need the following:
我需要创建一个 Multibranch Jenkins 作业来在 Tomcat 中部署一个应该在 Kubernetes 上运行的 .war 文件。基本上，我需要以下内容：
- A way to install Tomcat on Kubernetes platform.
- Deploy my war file on this newly installed Tomcat.
- 一种在Kubernetes平台上安装Tomcat的方法。
- 在这个新安装的 Tomcat 上部署我的 war 文件。
I need to make use of Dockerfileto make this happen.
我需要利用Dockerfile来实现这一点。
PS: I am very new to Kubernetes and Docker stuff and need basic details as well. I tried finding tutorials but couldn't get any satisfactory article.
PS：我对 Kubernetes 和 Docker 的东西很陌生，也需要基本的细节。我尝试寻找教程，但找不到任何令人满意的文章。
Any help will be highly highly appreciated.
任何帮助都将受到高度赞赏。
采纳答案by Nicolas Pepinster
Docker part
Docker 部分
You can use the tomcat docker official image
In your Dockerfilejust copy your war file in /usr/local/tomcat/webapps/directory :
在您Dockerfile刚刚将您的战争文件复制到/usr/local/tomcat/webapps/目录中：
FROM tomcat
COPY app.war /usr/local/tomcat/webapps/
Build it :
构建它：
docker build --no-cache -t <REGISTRY>/<IMAGE>:<TAG> .
docker build --no-cache -t <REGISTRY>/<IMAGE>:<TAG> .
Once your image is built, push it into a Docker registry of your choice.
构建镜像后，将其推送到您选择的 Docker 注册表中。
docker push <REGISTRY>/<IMAGE>:<TAG>
docker push <REGISTRY>/<IMAGE>:<TAG>
Kubernetes part
Kubernetes 部分
1) Here is a simple kubernetes Deploymentfor your tomcat image
1) 这是您的 tomcat 映像的简单 kubernetes部署
apiVersion: apps/v1
kind: Deployment
metadata:
name: tomcat-deployment
labels:
app: tomcat
spec:
replicas: 1
selector:
matchLabels:
app: tomcat
template:
metadata:
labels:
app: tomcat
spec:
containers:
- name: tomcat
image: <REGISTRY>/<IMAGE>:<TAG>
ports:
- containerPort: 8080
This Deployment definition will create a pod based on your tomcat image.
此部署定义将根据您的 tomcat 映像创建一个 pod。
Put it in a yml file and execute kubectl create -f yourfile.ymlto create it.
将其放入一个 yml 文件并执行kubectl create -f yourfile.yml以创建它。
2) Create a Service:
2）创建服务：
kind: Service
apiVersion: v1
metadata:
name: tomcat-service
spec:
selector:
app: tomcat
ports:
- protocol: TCP
port: 80
targetPort: 8080
You can now access your pod inside the cluster with http://tomcat-service.your-namespace/app(because your war is called app.war)
您现在可以使用http://tomcat-service.your-namespace/app访问集群内的 pod （因为您的 war 被称为app.war）
3) If you have Ingress controller, you can create an Ingress ressourceto expose the application outside the cluster :
3) 如果你有Ingress 控制器，你可以创建一个Ingress 资源来暴露集群外的应用程序：
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: tomcat-ingress
annotations:
nginx.ingress.kubernetes.io/rewrite-target: /
spec:
rules:
- http:
paths:
- path: /app
backend:
serviceName: tomcat-service
servicePort: 80
Now access the application using http://ingress-controller-ip/app
