如何在ENTRYPOINT dockerfile中访问构建args [英] How to access build args in ENTRYPOINT dockerfile

问题描述

我正在尝试基于payara dockerimage在payara micro中部署应用程序，并且我需要在ENTRYPOINT(基本上我想以ENTRYFORM访问构建args)exec形式中传递一个论据快照版本，因为ENTRYPOINT的exec形式是首选:我的docker文件如下:

I am trying to deploy an app in payara micro based on payara dockerimage and I need to pass one arguement snapshotversion in ENTRYPOINT(basically i want to access the build args in ENTRYFORM) exec form, as exec form of ENTRYPOINT is preferred: my docker file is as follows:

FROM payara/micro:5.193.1

ARG snapshotversion
ENV snapshotvs=$snapshotversion

RUN jar xf payara-micro.jar

COPY /service/war/target/app-emailverification-service-war-${snapshotversion}.war ${DEPLOY_DIR}/
COPY ojdbc6.jar ${PAYARA_HOME}/
COPY --chown=payara domain.xml /opt/payara/MICRO-INF/domain/domain.xml

RUN cd /opt/payara/MICRO-INF/domain && ls -lrt
#ENTRYPOINT ["java", "-jar", "/opt/payara/payara-micro.jar", "--deploy", "/opt/payara/deployments/app-service-war-$snapshotvs.war", "--domainConfig", "/opt/payara/MICRO-INF/domain/domain.xml","--addLibs", "/opt/payara/ojdbc6.jar"]

ENTRYPOINT java -jar /opt/payara/payara-micro.jar --deploy /opt/payara/deployments/app-service-war-$snapshotvs.war --domainConfig /opt/payara/MICRO-INF/domain/domain.xml --addLibs /opt/payara/ojdbc6.jar

注释的ENTRYPOINT不起作用.容器日志显示无效部署.我在这里想念什么?另外，我该如何使用CMD.有人可以举一个例子.

The commented ENTRYPOINT does not work. Container logs says invalid deployment. What am i missing here? Also how can I use CMD with this. Can someone post an example.

推荐答案

注释行不起作用，因为它是 ENTRYPOINT 的 exec 形式，但不能不要调用shell(/bin/sh -c )，因此不会发生变量替换.

The commented line doesn't work, because it is an exec form of ENTRYPOINT, which doesn't invoke shell (/bin/sh -c), so variable substitution doesn't happening.

如果要使用 exec 格式和环境变量，则需要直接指定它:

If you want to use an exec form and environment variables you need to specify it directly:

    ENTRYPOINT ["sh", "-c", "your command with env variable"]

关于如何与此一起使用 CMD 的问题，例如:

To your question about how can you use CMD with this, for example like this:

    ENTRYPOINT ["sh", "-c"]
    CMD ["your command with env variable"]

您提到，您想在 ENTRYPOINT 指令中使用build args.这实际上是不可能的，因为 ARG 和 ENV 都没有在 ENTRYPOINT 或 CMD 中扩展: https://docs.docker.com/engine/reference/builder/#scope

You mentioned, that you want to use build args in ENTRYPOINT instruction. It's not really possible, because nor ARG nor ENV are expanded in ENTRYPOINT or CMD: https://docs.docker.com/engine/reference/builder/#environment-replacement, https://docs.docker.com/engine/reference/builder/#scope

此外，您还可以查看具有最佳做法的出色页面用于专门编写Dockerfile和 ENTRYPOINT 指令.

Also you could take a look at great page with best practices for writing Dockerfile and ENTRYPOINT instructions specifically.

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