Ray*_*yek 1 python ubuntu flask docker
在 docker 20.10.2（版本 2291f61）中尝试一个简单的python Flask Web 应用程序。
\n执行以下操作：docker build -t hello-world .开始时没问题（请参见下文），但结束时为：
#6 2.866 After this operation, 305 MB of additional disk space will be used.\n#6 2.866 Do you want to continue? [Y/n] Abort.\n------\nexecutor failed running [/bin/sh -c apt-get install python3-pip]: exit code: 1\n我需要以某种方式回答“是”吗？还有其他解决方法吗？
\n编辑1： $ docker build -t Flask-tutorial:latest 。# 做同样的事情。
\n编辑 2：使用 @tentative 的 install -y 想法会更进一步。
\n > [4/6] RUN apt-get install -y flask:\n#7 0.742 Reading package lists...\n#7 2.103 Building dependency tree...\n#7 2.389 Reading state information...\n#7 2.665 E: Unable to locate package flask\n------\nexecutor failed running [/bin/sh -c apt-get install -y flask]: ex\nit code: 100\n编辑3：这里的代码构建了一个图像。
\n编辑4：Dockerfile
\nFROM ubuntu \n\nRUN apt-get update \nRUN apt-get install -y python3-pip\n# add -y to skip the y/n prompt and install\n#RUN apt-get install -y python3-pip flask\nRUN apt-get install -y flask\n\nADD app.py /\nWORKDIR /\n\nEXPOSE 5000\n\nCMD [\xe2\x80\x9cpython3\xe2\x80\x9d,\xe2\x80\x9dapp.py\xe2\x80\x9d]\n编辑 5：新的 docker 文件构建工作。但：
\n$ docker run -i -t --name frog hello-world\n/bin/sh: 1: [\xe2\x80\x9cpython3\xe2\x80\x9d,\xe2\x80\x9dapp.py\xe2\x80\x9d]: not found\n编辑6：将上面的开盘和收盘报价更改为中性报价。从主机运行时应用程序运行良好。容器得到一个：27.0.0.1拒绝连接。
\n编辑7：尝试：
\ndocker run -it -p 5000:5000 --name frog hello-world . \n这会导致连接被拒绝（firefox）、空响应（chrome、edge 和 opera）。这是在 Windows 10 上，防御者已关闭。
\n编辑8：做一个
\nif __name__ == \'__main__\':\n app.run(host=\'0.0.0.0\')\n然后一个
\n卷曲 127.0.0.1:5000 -v
\n从服务器得到空回复。
\n编辑9：仅使用： app.run("0.0.0.0" 有效！
\n原始输出。
\n ray@rays8350 /cygdrive/d/ray/docker/flask/myapp\n $ docker build -t hello-world .\n [+] Building 4.9s (7/9)\n => [internal] load build definition from Dockerfile 0.0s\n => => transferring dockerfile: 32B 0.0s\n => [internal] load .dockerignore 0.0s\n => => transferring context: 2B 0.0s\n => [internal] load metadata for docker.io/library/ubuntu:latest 1.6s\n => [1/6] FROM docker.io/library/ubuntu@sha256:703218c0465075f4425e58fac0 0.0s\n => => resolve docker.io/library/ubuntu@sha256:703218c0465075f4425e58fac0 0.0s\n => [internal] load build context 0.0s\n => => transferring context: 28B 0.0s\n => CACHED [2/6] RUN apt-get update 0.0s\n => ERROR [3/6] RUN apt-get install python3-pip 3.2s\n ------\n > [3/6] RUN apt-get install python3-pip:\n #6 0.588 Reading package lists...\n #6 1.927 Building dependency tree...\n #6 2.258 Reading state information...\n #6 2.683 The following additional packages will be installed:\n #6 2.683 binutils binutils-common binutils-x86-64-linux-gnu build-essential\n #6 2.683 ca-certificates cpp cpp-9 dirmngr dpkg-dev fakeroot file g++ g++-9 g\n c gcc-9\n #6 2.683 gcc-9-base gnupg gnupg-l10n gnupg-utils gpg gpg-agent gpg-wks-client\n #6 2.683 gpg-wks-server gpgconf gpgsm gpgv libalgorithm-diff-perl\n #6 2.683 libalgorithm-diff-xs-perl libalgorithm-merge-perl libasan5 libasn1-8\n heimdal\n #6 2.683 libassuan0 libatomic1 libbinutils libc-dev-bin libc6 libc6-dev libcc\n -0\n #6 2.684 libcrypt-dev libctf-nobfd0 libctf0 libdpkg-perl libexpat1 libexpat1-\n ev\n #6 2.684 libfakeroot libfile-fcntllock-perl libgcc-9-dev libgdbm-compat4 libg\n bm6\n #6 2.684 libgomp1 libgssapi3-heimdal libhcrypto4-heimdal libheimbase1-heimdal\n #6 2.684 libheimntlm0-heimdal libhx509-5-heimdal libisl22 libitm1 libkrb5-26-\n eimdal\n #6 2.684 libksba8 libldap-2.4-2 libldap-common liblocale-gettext-perl liblsan\n #6 2.684 libmagic-mgc libmagic1 libmpc3 libmpdec2 libmpfr6 libnpth0 libperl5.\n 0\n #6 2.684 libpython3-dev libpython3-stdlib libpython3.8 libpython3.8-dev\n #6 2.684 libpython3.8-minimal libpython3.8-stdlib libquadmath0 libreadline8\n #6 2.685 libroken18-heimdal libsasl2-2 libsasl2-modules libsasl2-modules-db\n #6 2.685 libsqlite3-0 libssl1.1 libstdc++-9-dev libtsan0 libubsan1 libwind0-h\n imdal\n #6 2.686 linux-libc-dev make manpages manpages-dev mime-support netbase opens\n l patch\n #6 2.686 perl perl-modules-5.30 pinentry-curses python-pip-whl python3 python\n -dev\n #6 2.686 python3-distutils python3-lib2to3 python3-minimal python3-pkg-resour\n es\n #6 2.686 python3-setuptools python3-wheel python3.8 python3.8-dev python3.8-m\n nimal\n #6 2.687 readline-common xz-utils zlib1g-dev\n #6 2.690 Suggested packages:\n #6 2.690 binutils-doc cpp-doc gcc-9-locales dbus-user-session libpam-systemd\n #6 2.690 pinentry-gnome3 tor debian-keyring g++-multilib g++-9-multilib gcc-9\n doc\n #6 2.690 gcc-multilib autoconf automake libtool flex bison gdb gcc-doc gcc-9-\n ultilib\n #6 2.690 parcimonie xloadimage scdaemon glibc-doc locales git bzr gdbm-l10n\n #6 2.690 libsasl2-modules-gssapi-mit | libsasl2-modules-gssapi-heimdal\n #6 2.690 libsasl2-modules-ldap libsasl2-modules-otp libsasl2-modules-sql\n #6 2.690 libstdc++-9-doc make-doc man-browser ed diffutils-doc perl-doc\n #6 2.690 libterm-readline-gnu-perl | libterm-readline-perl-perl libb-debug-pe\n l\n #6 2.690 liblocale-codes-perl pinentry-doc python3-doc python3-tk python3-ven\n #6 2.690 python-setuptools-doc python3.8-venv python3.8-doc binfmt-support\n #6 2.690 readline-doc\n #6 3.070 The following NEW packages will be installed:\n #6 3.070 binutils binutils-common binutils-x86-64-linux-gnu build-essential\n #6 3.070 ca-certificates cpp cpp-9 dirmngr dpkg-dev fakeroot file g++ g++-9 g\n c gcc-9\n #6 3.070 gcc-9-base gnupg gnupg-l10n gnupg-utils gpg gpg-agent gpg-wks-client\n #6 3.071 gpg-wks-server gpgconf gpgsm libalgorithm-diff-perl\n #6 3.071 libalgorithm-diff-xs-perl libalgorithm-merge-perl libasan5 libasn1-8\n heimdal\n #6 3.072 libassuan0 libatomic1 libbinutils libc-dev-bin libc6-dev libcc1-0\n #6 3.072 libcrypt-dev libctf-nobfd0 libctf0 libdpkg-perl libexpat1 libexpat1-\n ev\n #6 3.073 libfakeroot libfile-fcntllock-perl libgcc-9-dev libgdbm-compat4 libg\n bm6\n #6 3.073 libgomp1 libgssapi3-heimdal libhcrypto4-heimdal libheimbase1-heimdal\n #6 3.073 libheimntlm0-heimdal libhx509-5-heimdal libisl22 libitm1 libkrb5-26-\n eimdal\n #6 3.073 libksba8 libldap-2.4-2 libldap-common liblocale-gettext-perl liblsan\n #6 3.074 libmagic-mgc libmagic1 libmpc3 libmpdec2 libmpfr6 libnpth0 libperl5.\n 0\n #6 3.075 libpython3-dev libpython3-stdlib libpython3.8 libpython3.8-dev\n #6 3.075 libpython3.8-minimal libpython3.8-stdlib libquadmath0 libreadline8\n #6 3.077 libroken18-heimdal libsasl2-2 libsasl2-modules libsasl2-modules-db\n #6 3.077 libsqlite3-0 libssl1.1 libstdc++-9-dev libtsan0 libubsan1 libwind0-h\n imdal\n #6 3.077 linux-libc-dev make manpages manpages-dev mime-support netbase opens\n l patch\n #6 3.078 perl perl-modules-5.30 pinentry-curses python-pip-whl python3 python\n -dev\n #6 3.078 python3-distutils python3-lib2to3 python3-minimal python3-pip\n #6 3.079 python3-pkg-resources python3-setuptools python3-wheel python3.8\n #6 3.080 python3.8-dev python3.8-minimal readline-common xz-utils zlib1g-dev\n #6 3.083 The following packages will be upgraded:\n #6 3.086 gpgv libc6\n #6 3.106 2 upgraded, 113 newly installed, 0 to remove and 4 not upgraded.\n #6 3.106 Need to get 72.4 MB of archives.\n #6 3.106 After this operation, 305 MB of additional disk space will be used.\n #6 3.106 Do you want to continue? [Y/n] Abort.\n ------\n executor failed running [/bin/sh -c apt-get install python3-pip]: exit code: 1\n \n ray@rays8350 /cygdrive/d/ray/docker/flask/myapp\n $\n您应该更改RUNDockerfile 中的行，apt-get以使用该-y标志来跳过要求您确认“是”的情况。
本教程中的 Dockerfile 实际上似乎已经过时或有错误。您需要使用pip3now 来安装Flask并在命令-y中包含该标志apt-get。我编辑了教程中的 Dockerfile 并发布在下面：
FROM ubuntu
RUN apt-get update -y && \
apt-get install -y python3-pip && \
pip3 install Flask
COPY app.py /
WORKDIR /
EXPOSE 5000
CMD ["python3","app.py"]
编辑要解决此答案中 Windows 上的连接问题，您可以通过更改 Python 应用程序中的 main 函数来解决此问题：
FROM ubuntu
RUN apt-get update -y && \
apt-get install -y python3-pip && \
pip3 install Flask
COPY app.py /
WORKDIR /
EXPOSE 5000
CMD ["python3","app.py"]
对此：
if __name__ == '__main__':
app.run()
原因是你需要绑定Flask0.0.0.0而不是容器中的localhost接口，否则，它不会转发到容器之外。修复该问题后，您应该能够localhost:5000在主机上访问该应用程序。
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