java 在 docker 中调试 spring-boot
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debug spring-boot in docker
提问by Jarle Hansen
For some reason I have issues connecting remote debug to a spring-boot app running inside docker. I start the java app with:
出于某种原因，我在将远程调试连接到在 docker 中运行的 spring-boot 应用程序时遇到了问题。我使用以下命令启动 Java 应用程序：
java -Xdebug -Xrunjdwp:server=y,transport=dt_socket,address=8000,suspend=n -jar app.jar
For docker I expose these ports on docker-compose:
对于 docker，我在 docker-compose 上公开这些端口：
ports:
- "8080:8080"
- "8000:8000"
However, the debugger is not able to connect on port 8000. It works when I run the server locally but not inside docker. Any idea why?
但是，调试器无法在端口 8000 上连接。当我在本地运行服务器但不在 docker 内部时，它可以工作。知道为什么吗？
Docker ps output:
Docker ps 输出：
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
0d17e6851807 pocmanager_manager:latest "/bin/sh -c 'java -D 3 seconds ago Up 2 seconds 0.0.0.0:8000->8000/tcp, 0.0.0.0:8080->8080/tcp pocmanager_manager_1
35ed2e2c32bc redis:latest "/entrypoint.sh redi 14 seconds ago Up 13 seconds 0.0.0.0:6379->6379/tcp pocmanager_redis_1
回答by nekperu15739
i have to realize that in the dockerFile the Expose command only do the half of work, this mean that only expose the port inside the docker, but not outside, in your example the result will be like this:
我必须意识到在 dockerFile 中，Expose 命令只完成了一半的工作，这意味着只公开 docker 内部的端口，而不是外部，在您的示例中，结果将是这样的：
Debug works with the JAVA_OPTS and remote debug, the dockerFile looks like this:
调试与 JAVA_OPTS 和远程调试一起使用，dockerFile 如下所示：
FROM frolvlad/alpine-oraclejdk8:slim
VOLUME /tmp
ADD gs-spring-boot-docker-0.1.0.jar app.jar
RUN sh -c 'touch /app.jar'
ENTRYPOINT [ "sh", "-c", "java $JAVA_OPTS -jar /app.jar" ]
and executing this command:
并执行此命令：
docker run -e "JAVA_OPTS=-agentlib:jdwp=transport=dt_socket,address=8000,server=y,suspend=y" -p 8080:8080 -p 8000:8000 -t springio/gs-spring-boot-docker
As you can see, you should expose the debug port, during the run, in my case(eclipse) 8000
如您所见，您应该在运行期间公开调试端口，在我的情况下（eclipse）8000
回答by SWiggels
Hi I faced the same problem.
嗨，我遇到了同样的问题。
I added the following to the entrypoint in the Dockerfile:
我在 Dockerfile 的入口点添加了以下内容：
"-agentlib:jdwp=transport=dt_socket,address=8000,server=y,suspend=n"
“-agentlib:jdwp=transport=dt_socket,address=8000,server=y,suspend=n”
Now it looks like this:
现在它看起来像这样：
FROM java:8
VOLUME /tmp
ADD realName*.jar app.jar
EXPOSE 4786
RUN sh -c 'touch /app.jar'
ENTRYPOINT
["java","-agentlib:jdwp=transport=dt_socket,address=8000,server=y,suspend=n","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
I did not Exposeport 8000 in the Dockerfile.
我没有Expose在 Dockerfile 中端口 8000。
Hope this helps.
希望这可以帮助。
回答by Palanivelrajan
I think the reason for this might be, your Virtual Box VM configuration does not tunnel the debug port to the host machine.
我认为原因可能是，您的 Virtual Box VM 配置没有将调试端口隧道连接到主机。
Check this link https://github.com/boot2docker/boot2docker/blob/master/doc/WORKAROUNDS.md
检查此链接 https://github.com/boot2docker/boot2docker/blob/master/doc/WORKAROUNDS.md
Basically, in your case, you have to command prompt and run
基本上，在您的情况下，您必须命令提示符并运行
VBoxManage modifyvm "boot2docker-vm" --natpf1 "tcp-port8000,tcp,,8000,,8000";
VBoxManage modifyvm "boot2docker-vm" --natpf1 "tcp-port8000,tcp,,8000,,8000";
Note : Make sure VBoxManage is in your PATH
注意：确保 VBoxManage 在您的 PATH 中
