没有端口映射，Docker容器正在运行。

Question

我创建了一个用于从dockerfile构建映像的docker-组合文件，然后运行容器--这是我的代码：

Dockerfile

FROM anapsix/alpine-java

VOLUME [ "/var/run/jars/" ]

ADD hello-world.jar /var/run/jars/

EXPOSE 8080
ENTRYPOINT [ "java" ]
CMD ["-?"]

docker-compose.yml

version: '3'
services:
  hello-world-image:
   build: .
   image: hello-world-image    
  hello-world:
   image: hello-world-image
   container_name: hello-world
   ports:
    - "8080:8080"
   volumes:
     - ./logs_ACM:/root/logs_ACM
   command: -jar /var/run/jars/hello-world.jar
   restart: always

码头ps输出：

CONTAINER ID   IMAGE               COMMAND                  CREATED         STATUS                                  PORTS     NAMES
103b0a3c30e3   hello-world-image   "java -jar /var/run/…"   5 seconds ago   Restarting (1) Less than a second ago             hello-world

当我用"docker“检查正在运行的容器时，端口列是空的，因此即使我在我的docker文件中指定了端口，也没有进行端口映射。为了解决这个问题，需要对我的坞-撰写文件进行哪些更改？

新版本的dockerfile和docker-组合：

FROM anapsix/alpine-java

USER root

RUN mkdir -p /var/run/jars/

COPY spring-petclinic-2.4.2.jar /var/run/jars/

EXPOSE 8081

ENTRYPOINT [ "java" ]

CMD ["-?"]

version: '3'  # '3' means '3.0'
services:
spring-petclinic:
 build: .
# Only if you're planning to `docker-compose push`
# image: registry.example.com/name/hello-world-image:${TAG:-latest}
 ports:
  - "8081:8081"
 volumes:
 # A bind-mount directory to read out log files is a good use of
 # `volumes:`.  This does not require special setup in the Dockerfile.
  - ./logs_ACM:/root/logs_ACM
 command: -jar /var/run/jars/spring-petclinic-2.4.2.jar
mysql:
 image: mysql:5.7
 ports:
  - "3306:3306"
 environment:
  - MYSQL_ROOT_PASSWORD=
  - MYSQL_ALLOW_EMPTY_PASSWORD=true
  - MYSQL_USER=petclinic
  - MYSQL_PASSWORD=petclinic
  - MYSQL_DATABASE=petclinic
 volumes:
  - "./conf.d:/etc/mysql/conf.d:ro"

Answer 1

我认为这里最大的问题是Dockerfile中的VOLUME指令。Dockerfile documentation for VOLUME指出：

在Dockerfile中更改卷：(如果有任何构建步骤)在声明卷后更改卷内的数据，则这些更改将被丢弃。

因此，当您为包含jar文件的目录声明一个VOLUME，然后尝试对其进行ADD内容时，它就会丢失。

在大多数实际情况下，您不需要VOLUME。您应该能够将Dockerfile重写为：

FROM anapsix/alpine-java

# Do not create a VOLUME.

# Generally prefer COPY to ADD.  Will create the target directory if needed.
COPY hello-world.jar /var/run/jars/

EXPOSE 8080

# Don't set an ENTRYPOINT just naming an interpreter.
# Do make the default container command be to run the application.
CMD ["java", "-jar", "/var/run/jars/hello-world.jar"]

在docker-compose.yml文件中，您不需要单独的“服务”来构建映像，而且通常不需要覆盖container_name: (由Compose提供)或command: (来自Dockerfile)。这可以减少为：

version: '3.8'  # '3' means '3.0'
services:
  hello-world:
   build: .
   # Only if you're planning to `docker-compose push`
   # image: registry.example.com/name/hello-world-image:${TAG:-latest}
   ports:
     - "8080:8080"
   volumes:
     # A bind-mount directory to read out log files is a good use of
     # `volumes:`.  This does not require special setup in the Dockerfile.
     - ./logs_ACM:/root/logs_ACM
   # Don't enable auto-restart until you've debugged the start sequence
   # restart: always