虽然Docker history命令可以看到所有历史层级的操作，但是还是需要手动去写Dockerfile
dfimage就是这样一个工具
dfimage是一个alpine的镜像，启动的时候，通过将docker.sock映射到容器内部来运行，通常将这个操作做成别名
下载镜像docker run -v /var/run/docker.sock:/var/run/docker.sock --rm alpine/dfimage:latest设置别名alias dfimage="docker run -v /var/run/docker.sock:/var/run/docker.sock --rm alpine/dfimage:latest"测试Nginx查看1、先pull下nginx镜像
docker pull nginx:latest2、测试
dfimage -sV=1.36 nginx:latest输出的结果
Analyzing nginx:latestDocker Version: 19.03.12GraphDriver: overlay2Environment Variables|PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin|NGINX_VERSION=1.21.0|NJS_VERSION=0.5.3|PKG_RELEASE=1~busterOpen Ports|80Image user|User is rootPotential secrets:Dockerfile:CMD ["bash"]LABEL maintainer=NGINX Docker Maintainers <docker-maint@nginx.com>ENV NGINX_VERSION=1.21.0ENV NJS_VERSION=0.5.3ENV PKG_RELEASE=1~busterRUN set -x  && addgroup --system --gid 101 nginx  && adduser --system --disabled-login --ingroup nginx --no-create-home --home /nonexistent --gecos "nginx user" --shell /bin/false --uid 101 nginx  && apt-get update  && apt-get install --no-install-recommends --no-install-suggests -y gnupg1 ca-certificates  && NGINX_GPGKEY=573BFD6B3D8FBC641079A6ABABF5BD827BD9BF62; found=''; for server in ha.pool.sks-keyservers.net hkp://keyserver.ubuntu.com:80 hkp://p80.pool.sks-keyservers.net:80 pgp.mit.edu ; do echo "FetchingGPG key $NGINX_GPGKEY from $server"; apt-key adv --keyserver "$server" --keyserver-options timeout=10 --recv-keys "$NGINX_GPGKEY"  && found=yes  && break; done; test -z "$found"  && echo >&2 "error: failed to fetch GPG key $NGINX_GPGKEY"  && exit 1; apt-get remove --purge --auto-remove -y gnupg1  && rm -rf /var/lib/apt/lists/*  && dpkgArch="$(dpkg --print-architecture)"  && nginxPackages=" nginx=${NGINX_VERSION}-${PKG_RELEASE} nginx-module-xslt=${NGINX_VERSION}-${PKG_RELEASE} nginx-module-geoip=${NGINX_VERSION}-${PKG_RELEASE} nginx-module-image-filter=${NGINX_VERSION}-${PKG_RELEASE} nginx-module-njs=${NGINX_VERSION}+${NJS_VERSION}-${PKG_RELEASE} "  && case "$dpkgArch" in amd64|i386|arm64) echo "deb https://nginx.org/packages/mainline/debian/ buster nginx" >> /etc/apt/sources.list.d/nginx.list  && apt-get update ;; *) echo "deb-src https://nginx.org/packages/mainline/debian/ buster nginx" >> /etc/apt/sources.list.d/nginx.list  && tempDir="$(mktemp -d)"  && chmod 777 "$tempDir"  && savedAptMark="$(apt-mark showmanual)"  && apt-get update  && apt-get build-dep -y $nginxPackages  && ( cd "$tempDir"  && DEB_BUILD_OPTIONS="nocheck parallel=$(nproc)" apt-get source --compile $nginxPackages )  && apt-mark showmanual | xargs apt-mark auto > /dev/null  && { [ -z "$savedAptMark" ] || apt-mark manual $savedAptMark; }  && ls -lAFh "$tempDir"  && ( cd "$tempDir"  && dpkg-scanpackages . > Packages )  && grep '^Package: ' "$tempDir/Packages"  && echo "deb [ trusted=yes ] file://$tempDir ./" > /etc/apt/sources.list.d/temp.list  && apt-get -o Acquire::GzipIndexes=false update ;; esac  && apt-get install --no-install-recommends --no-install-suggests -y $nginxPackages gettext-base curl  && apt-get remove --purge --auto-remove -y  && rm -rf /var/lib/apt/lists/* /etc/apt/sources.list.d/nginx.list  && if [ -n "$tempDir" ]; then apt-get purge -y --auto-remove  && rm -rf "$tempDir" /etc/apt/sources.list.d/temp.list; fi  && ln -sf /dev/stdout /var/log/nginx/access.log  && ln -sf /dev/stderr /var/log/nginx/error.log  && mkdir /docker-entrypoint.dCOPY file:65504f71f5855ca017fb64d502ce873a31b2e0decd75297a8fb0a287f97acf92 in /docker-entrypoint.shCOPY file:0b866ff3fc1ef5b03c4e6c8c513ae014f691fb05d530257dfffd07035c1b75da in /docker-entrypoint.ddocker-entrypoint.d/docker-entrypoint.d/10-listen-on-ipv6-by-default.shCOPY file:0fd5fca330dcd6a7de297435e32af634f29f7132ed0550d342cad9fd20158258 in /docker-entrypoint.ddocker-entrypoint.d/docker-entrypoint.d/20-envsubst-on-templates.shCOPY file:09a214a3e07c919af2fb2d7c749ccbc446b8c10eb217366e5a65640ee9edcc25 in /docker-entrypoint.ddocker-entrypoint.d/docker-entrypoint.d/30-tune-worker-processes.shENTRYPOINT ["/docker-entrypoint.sh"]EXPOSE 80STOPSIGNAL SIGQUITCMD ["nginx" "-g" "daemon off;"]