英文:
package jar in docker + kubernetes
问题
以下是已经翻译好的内容：
我对Docker和Kubernetes还不熟悉。我已经创建了一个JAR文件，我需要在Kubernetes创建Pod时启动这个JAR文件。我希望能够从Kubernetes的pod.yml文件中传递参数，以调用打包在Docker镜像中的JAR文件中的Java类。
Dockerfile
FROM openjdk:8
ARG JAR_FILE=target/app.jar
cd /usr/local/runme
WORKDIR /usr/local/runme/
COPY ${JAR_FILE} app-jar-with-dependencies.jar
以下是我的Pod文件 -
apiVersion: v1
kind: Pod
metadata:
name: app
labels:
zone: dev
version: v1
spec:
containers:
- name: app-ctr
image: "从上述Dockerfile创建的Docker镜像"
ports:
- containerPort: 8080
env:
- name: NO_OF_CONSUMERS
value: "1"
args: ["-n", "$(NO_OF_CONSUMERS)"]
在我的pom.xml中，我有以下mainClass -
我不确定如何进行下一步。我需要使用ENTRYPOINT、CMD还是其他什么东西。
英文:
I am new to docker, kubernetes. I have created a jar file and I need to start the jar
file when kube creates the pod. I want to pass args from kube pod.yml to call a java class
in the jar file packaged in the docker image -
Dockerfile
==========
FROM openjdk:8
ARG JAR_FILE=target/app.jar
# cd /usr/local/runme
WORKDIR /usr/local/runme/
COPY ${JAR_FILE} app-jar-with-dependencies.jar
The following is my pod file -
apiVersion: v1
kind: Pod
metadata:
name: app
labels:
zone: dev
version: v1
spec:
containers:
- name: app-ctr
image: "docker-image-created-from-above-dockerfile"
ports:
- containerPort: 8080
env:
- name: NO_OF_CONSUMERS
value: "1"
args: [ "-n", "$(NO_OF_CONSUMERS)"]
In my pom.xml I have the following mainClass -
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<archive>
<manifest>
<mainClass>com.app.KafkaConsumer</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
<executions>
<execution>
<id>make-assembly</id> <!-- this is used for inheritance merges -->
<phase>package</phase> <!-- bind to the packaging phase -->
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
I am not sure how to go about this. Do I need to use ENTRYPOINT or CMD or anything else.
答案1
得分: 1
你需要在 Dockerfile 中设置一个入口点，启动应用程序/进程，例如：java -jar app-jar-with-dependencies.jar。然后在 Pod 定义中，当使用 args 时，Kubernetes 将把它们作为运行时参数传递。
英文:
You need to have an entrypoint in the Dockerfile which starts the applicaion/process like java -jar app-jar-with-dependencies.jar. Then in the pod definition when args is used kubernetes will pass them as a run time args.
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