更改apk源为中科大，ruby源为ruby-china，以加快build速度的 metasploit-framework Dockerfile 。源Dockerfile地址：https://github.com/rapid7/metasploit-framework

Dockerfile

FROM ruby:2.4.1-alpine
MAINTAINER Rapid7

ARG BUNDLER_ARGS="--jobs=8 --without development test coverage"
ENV APP_HOME /usr/src/metasploit-framework/
ENV MSF_USER msf
ENV NMAP_PRIVILEGED=""
WORKDIR $APP_HOME

COPY Gemfile* m* Rakefile $APP_HOME
COPY lib $APP_HOME/lib

RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.ustc.edu.cn/g' /etc/apk/repositories && \
    apk update && \
    apk add \
      sqlite-libs \
      nmap \
      nmap-scripts \
      nmap-nselibs \
      postgresql-libs \
      ncurses \
      libcap \
    && apk add --virtual .ruby-builddeps \
      autoconf \
      bison \
      build-base \
      ruby-dev \
      openssl-dev \
      readline-dev \
      sqlite-dev \
      postgresql-dev \
      libpcap-dev \
      libxml2-dev \
      libxslt-dev \
      yaml-dev \
      zlib-dev \
      ncurses-dev \
      git \
    && echo "gem: --no-ri --no-rdoc" > /etc/gemrc \
    && gem sources --add https://gems.ruby-china.org/ --remove https://rubygems.org/ \
    && gem update --system \
    && gem install bundler \
    && bundle config mirror.https://rubygems.org https://gems.ruby-china.org \
    && bundle install --system $BUNDLER_ARGS \
    && apk del .ruby-builddeps \
    && rm -rf /var/cache/apk/*

RUN adduser -g msfconsole -D $MSF_USER

RUN /usr/sbin/setcap cap_net_raw,cap_net_bind_service=+eip $(which ruby)
RUN /usr/sbin/setcap cap_net_raw,cap_net_bind_service=+eip /usr/bin/nmap

USER $MSF_USER

ADD ./ $APP_HOME

CMD ["./msfconsole", "-r", "docker/msfconsole.rc"]

与原文件diff结果：

➜  metasploit-framework git:(master) ✗ git diff Dockerfile
diff --git a/Dockerfile b/Dockerfile
index 141513b..30eae94 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -10,7 +10,8 @@ WORKDIR $APP_HOME
 COPY Gemfile* m* Rakefile $APP_HOME
 COPY lib $APP_HOME/lib
 
-RUN apk update && \
+RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.ustc.edu.cn/g' /etc/apk/repositories && \
+    apk update && \
     apk add \
       sqlite-libs \
       nmap \
@@ -36,8 +37,10 @@ RUN apk update && \
       ncurses-dev \
       git \
     && echo "gem: --no-ri --no-rdoc" > /etc/gemrc \
+    && gem sources --add https://gems.ruby-china.org/ --remove https://rubygems.org/ \
     && gem update --system \
     && gem install bundler \
+    && bundle config mirror.https://rubygems.org https://gems.ruby-china.org \
     && bundle install --system $BUNDLER_ARGS \
     && apk del .ruby-builddeps \
     && rm -rf /var/cache/apk/*

更改进入MSF后的工作目录为 /home/msf/.msf4

➜  metasploit-framework git:(master) ✗ git diff docker/msfconsole.rc
diff --git a/docker/msfconsole.rc b/docker/msfconsole.rc
index 2ced959..da12e89 100644
--- a/docker/msfconsole.rc
+++ b/docker/msfconsole.rc
@@ -7,4 +7,5 @@ else
 end
 run_single("setg LHOST #{lhost}")
 run_single("db_connect #{ENV['DATABASE_URL']}") if ENV['DATABASE_URL']
+run_single("cd /home/msf/.msf4")
 </ruby>