dockerfile VOLUME

FROM java:8
VOLUME /tmp /usr/tmp
COPY /target/springbootdemo.jar app.jar
RUN bash -c 'touch /app.jar'
EXPOSE 10001
ENTRYPOINT ["java","-jar","/app.jar"]

1. VOLUME /tmp 将容器中的 /tmp 目录映射到宿主机的目录
2. 查看映射的宿主机目录

docker inspect add8a379065c

"Mounts": [
            {
                "Type": "volume",
                "Name": "3c18486ccfe419156ef62d346d29f6668ec34a236497c47f7e7907e95c310d0e",
                "Source": "/var/lib/docker/volumes/3c18486ccfe419156ef62d346d29f6668ec34a236497c47f7e7907e95c310d0e/_data",
                "Destination": "/tmp",
                "Driver": "local",
                "Mode": "",
                "RW": true,
                "Propagation": ""
            },
            {
                "Type": "volume",
                "Name": "c5b6e1e0f6db6e70f15d836caa9663173e4bd8e23db1817146c31348d931a43b",
                "Source": "/var/lib/docker/volumes/c5b6e1e0f6db6e70f15d836caa9663173e4bd8e23db1817146c31348d931a43b/_data",
                "Destination": "/usr/tmp",
                "Driver": "local",
                "Mode": "",
                "RW": true,
                "Propagation": ""
            }
        ]

"/var/lib/docker/volumes/3c18486ccfe419156ef62d346d29f6668ec34a236497c47f7e7907e95c310d0e/_data"
即为 宿主机 对应 容器 /tmp 的映射目录