我目前正在对接一个由R笔记本和闪亮的 Jmeter 板组成的混合体，它将在一个闪亮的服务器中提供服务。从Dockerfile中可以注意到，我从rocker/shiny映像开始，并完成以下构建步骤：
1.从renv.lock文件安装所需的软件包
1.执行main.R，它将负责呈现. rmd文件，并将. html输出放在/reports文件夹中。
1.在shiny-server文件夹中复制编织的文档和闪亮的 Jmeter 板以备使用。
1.复制闪亮的服务器配置文件
1.删除临时文件（工作目录和下载的包）。
1.暴露8080端口。
现在，以这种方式构建的结果图像重约1. 79GB，这听起来远远高于我的预期（基本rocker/shiny图像只有约400MB）。
我想知道我错过了什么（太多的层重复也许？）或什么是错的Dockerfile。
项目文件夹结构：

.
├── cool-report.Rproj
├── Dockerfile
├── R
│   └── main.R
├── readme.md
├── renv
│   ├── activate.R
│   ├── library
│   ├── settings.dcf
│   └── staging
├── renv.lock
├── rmarkdown
│   ├── area1.Rmd
│   ├── area2.Rmd
│   └── data
│       ├── data_import_1.R
│       └── data_import_2.R
├── shiny
│   └── mtcars_example
│       └── app.R
└── shiny-server.conf

停靠文件：

FROM rocker/shiny:latest

COPY . /tmp
WORKDIR /tmp

RUN echo "options(renv.consent=TRUE)" >> .Rprofile

# Install packages from renv
RUN R -e "install.packages('remotes', repos = c(CRAN = 'https://cloud.r-project.org'))" \
  && R -e "remotes::install_github('rstudio/renv')" \
  && R -e "renv::restore(confirm = FALSE)"

# Render report(s)
RUN Rscript ./R/main.R

# Copy reports and shiny dashboards
RUN cp -r ./reports /srv/shiny-server/reports \
  && cp -r shiny/* /srv/shiny-server/reports

WORKDIR /

# Copy config files and server executable
COPY shiny-server.conf /etc/shiny-server/shiny-server.conf

# Cleanup temp files
RUN rm -rf /tmp/*

# Expose port as on shiny-server.conf
EXPOSE 8080

docker image history -H <image-id>输出：

andodet@t480s:~/code/study/cool-report$ docker image history -H d21975ad912d
IMAGE               CREATED             CREATED BY                                      SIZE                COMMENT
d21975ad912d        About an hour ago   /bin/sh -c #(nop)  EXPOSE 8080                  0B
11345fbe7c72        About an hour ago   /bin/sh -c rm -rf /tmp/*                        0B
ce8b33984b85        About an hour ago   /bin/sh -c #(nop) COPY file:1d2d0c462c909cc4…   741B
761bc2a982cd        About an hour ago   /bin/sh -c #(nop) WORKDIR /                     0B
5aa2ae037138        About an hour ago   /bin/sh -c cp -r ./reports /srv/shiny-server…   1.76MB
12b3a3505ae9        About an hour ago   /bin/sh -c Rscript ./R/main.R                   1.76MB
69cacc1ad08d        About an hour ago   /bin/sh -c R -e "install.packages('remotes',…   328MB
eb07c8335c8f        2 hours ago         /bin/sh -c echo "options(renv.consent=TRUE)"…   53B
55a14476302f        2 hours ago         /bin/sh -c #(nop) WORKDIR /tmp                  0B
84e502e37546        2 hours ago         /bin/sh -c #(nop) COPY dir:dfcc724126bc931ba…   31.3MB
f40ad3a5dadd        5 weeks ago         /bin/sh -c #(nop)  CMD ["/usr/bin/shiny-serv…   0B
<missing>           5 weeks ago         /bin/sh -c #(nop) COPY file:fef7b189480bb622…   359B
<missing>           5 weeks ago         /bin/sh -c #(nop)  EXPOSE 3838                  0B
<missing>           5 weeks ago         /bin/sh -c wget --no-verbose https://downloa…   513MB
<missing>           5 weeks ago         /bin/sh -c apt-get update && apt-get install…   313MB
<missing>           2 months ago        /bin/sh -c #(nop)  CMD ["R"]                    0B
<missing>           2 months ago        /bin/sh -c apt-get update   && apt-get insta…   506MB
<missing>           2 months ago        /bin/sh -c #(nop)  ENV R_VERSION=3.6.1 LC_AL…   0B
<missing>           2 months ago        /bin/sh -c #(nop)  ENV BUILD_DATE=2019-12-12    0B
<missing>           2 months ago        /bin/sh -c #(nop)  ARG BUILD_DATE               0B
<missing>           2 months ago        /bin/sh -c #(nop)  ARG R_VERSION                0B
<missing>           2 months ago        /bin/sh -c #(nop)  LABEL org.label-schema.li…   0B
<missing>           2 months ago        /bin/sh -c #(nop)  CMD ["bash"]                 0B
<missing>           2 months ago        /bin/sh -c #(nop) ADD file:8f7dc710e276f54a3…   101MB