无法在 Docker 入口点命令中使用变量

Question

我正在尝试构建一个 dockerfile。我之前尝试为我的项目使用硬编码路径，并且输出很好。但是，一旦我开始使用变量，java 代码就停止执行。

Dockerfile

FROM java:7
EXPOSE 7100

ARG version
ENV version=$version
RUN echo $version

RUN mkdir -p /cacheDir/services/live/prediction/p7100/$version/logs
RUN ls -tlr /cacheDir/services/live/prediction/p7100/

RUN mkdir -p /cacheDir/services/releases/prediction/p7100/$version/

RUN mkdir -p /cacheDir/services/predictionmodel
ADD target/predictionDependencies/star /cacheDir/services/predictionmodel/ #star here is the operator (*), it was being interpret as comments by this stackoverflow editor. 

ADD /target/prediction-0.0.13-SNAPSHOT.jar /cacheDir/services/releases/prediction/p7100/$version/prediction-0.0.13-SNAPSHOT.jar

ADD /target/instance.properties /cacheDir/services/releases/prediction/p7100/$version/instance.properties

ADD /target/logback.xml /cacheDir/services/releases/prediction/p7100/$version/logback.xml

RUN ls -ltr /cacheDir/services/live/prediction/p7100/$version/
RUN ls -ltr /cacheDir/services/releases/prediction/p7100/$version/
RUN ls -ltr /cacheDir/services/predictionmodel

ENTRYPOINT java -server -Xmx2g -Xloggc:/cacheDir/services/live/prediction/p7100/$version/logs/gc.log -verbose:gc -XX:+PrintGCDateStamps -XX:+PrintGCDetails -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/cacheDir/services/live/prediction/p7100/$version/oom.dump -Dlogback.configurationFile=/cacheDir/services/releases/prediction/p7100/$version/logback.xml -Dlog.home=/cacheDir/services/live/prediction/p7100/$version/logs -Dlogback.debug=true -Dbroker.l^Ct=sv-kafka6.pv.sv.nextag.com:9092,sv-kafka7.pv.sv.nextag.com:9092,sv-kafka8.pv.sv.nextag.com:9092,sv-kafka9.pv.sv.nextag.com:9092 -jar /cacheDir/services/releases/prediction/p7100/$version/prediction-0.0.13-SNAPSHOT.jar 7100 /cacheDir/services/releases/prediction/p7100/$version/instance.properties /com/wizecommerce/services/qa &

用于构建映像的命令。

docker build --build-arg version=0.0.14-SNAPSHOT -t prediction:0.0.14-SNAPSHOT .

图像似乎成功了。但是，当我运行命令时，容器会自行退出。使用的运行命令：

docker run -p 7100:7100 -v ~/PredictionVolume/logs/:/cacheDir/services/live/prediction/p7100/0.0.14-SNAPSHOT/logs/  -t prediction:0.0.14-SNAPSHOT

当试图查看正在运行的容器时，它并没有运行。

我尝试使用我找到的这两种解决方案，但似乎都没有。

How do I use Docker environment variable in ENTRYPOINT array?

其他解决方案是我用这个替换了以下 ENTRYPOINT 命令。

ENTRYPOINT ["sh","-c","java","-server","-Xmx2g","-Xloggc:/cacheDir/services/live/prediction/p7100/${version}/logs/gc.log","-verbose:gc","-XX:+PrintGCDateStamps","-XX:+PrintGCDetails","-XX:+HeapDumpOnOutOfMemoryError","-XX:HeapDumpPath=/cacheDir/services/live/prediction/p7100/${version}/oom.dump","-Dlogback.configurationFile=/cacheDir/services/releases/prediction/p7100/${version}/logback.xml","-Dlog.home=/cacheDir/services/live/prediction/p7100/${version}/logs","-Dlogback.debug=true","-Dbroker.l^Ct=sv-kafka6.pv.sv.nextag.com:9092,sv-kafka7.pv.sv.nextag.com:9092,sv-kafka8.pv.sv.nextag.com:9092,sv-kafka9.pv.sv.nextag.com:9092","-jar","/cacheDir/services/releases/prediction/p7100/${version}/prediction-0.0.13-SNAPSHOT.jar","7100","/cacheDir/services/releases/prediction/p7100/${version}/instance.properties","/com/wizecommerce/services/qa","&"]

但是使用这个命令，输出就像是，如果你在终端上输入 java 显示所有可用的选项将显示在屏幕上（终端）。

任何人都可以提出一条出路吗？ 谢谢！！！

Answer 1

试试这个：

ENTRYPOINT ["sh","-c","java -server -Xmx2g ..."]

当您使用sh -c 时，它需要一个单个 参数，即要运行的命令，用空格分隔参数，就像您在命令行中输入它一样。您目前只运行 java 并将一堆额外的不适当参数传递给 sh。

另外，最后去掉与符号& - 你不想尝试后台处理进程。