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temp/Dockerfile

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+FROM redis:2.8.13
+
+# switch to root to build image
+# =================================================
+USER root
+
+# prepare rootfs
+# =================================================
+RUN mkdir /rootfs
+WORKDIR /rootfs
+RUN mkdir bin etc dev dev/pts lib usr proc sys tmp
+RUN mkdir -p usr/lib64 usr/bin usr/local/bin
+RUN touch etc/resolv.conf
+RUN cp /etc/nsswitch.conf etc/nsswitch.conf
+RUN echo root:x:0:0:root:/:/bin/sh > etc/passwd
+RUN echo root:x:0: > etc/group
+RUN ln -s lib lib64
+RUN ln -s bin sbin
+
+# install busybox
+# =================================================
+ADD https://busybox.net/downloads/binaries/1.21.1/busybox-x86_64 /sbin/busybox
+RUN chmod +x /sbin/busybox
+RUN cp /sbin/busybox bin
+RUN busybox --install -s bin
+
+# extract redis-server
+# =================================================
+RUN cp /usr/local/bin/redis-server usr/bin/redis-server
+
+# extract redis-server's dependencies
+# =================================================
+RUN bash -c "cp /lib/x86_64-linux-gnu/lib{m,dl,pthread,c}.so.* lib64"
+RUN cp /lib64/ld-linux-x86-64.so.2 lib64/
+
+# build rootfs
+RUN tar cf /rootfs.tar .

temp/README.md

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+$docker run -d temp:latest
+$docker ps
+CONTAINER ID        IMAGE               COMMAND                  	CREATED             STATUS              PORTS                    NAMES
+2779bca0c7e5        temp:latest            "/entrypoint.sh demo"   2 seconds ago       Up 1 seconds        6379/tcp                 stoic_galileo
+$docker cp 2779bca0c7e5:/rootfs.tar /tmp/