Docker课程教程，python pip失败

我按照https://docker-curriculum.com/中的教程生成我的第一个Docker镜像。在第2.4节中，我们将学习如何使用基本映像python:3-onbuild来配置一个简单的Dockerfile，它将自动运行pip并安装requirements.txt的依赖关系。Docker课程教程，python pip失败

的问题是，当我尝试建立搬运工，包装简单地加载失败：

[email protected]:~/workspace/docker-curriculum/flask-app$ docker build -t prakhar1989/catnip . 
Sending build context to Docker daemon 8.704kB 
Step 1/3 : FROM python:3-onbuild 
# Executing 3 build triggers... 
Step 1/1 : COPY requirements.txt /usr/src/app/ 
---> Using cache 
Step 1/1 : RUN pip install --no-cache-dir -r requirements.txt 
---> Running in 74c4e94fa1ba 
Collecting Flask (from -r requirements.txt (line 1)) 
    Retrying (Retry(total=4, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7fc6592831d0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution',)': /simple/flask/ 
    Retrying (Retry(total=3, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7fc659283cc0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution',)': /simple/flask/ 
    Retrying (Retry(total=2, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7fc659283208>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution',)': /simple/flask/ 
    Retrying (Retry(total=1, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7fc659283470>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution',)': /simple/flask/ 
    Retrying (Retry(total=0, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7fc659283ba8>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution',)': /simple/flask/ 
    Could not find a version that satisfies the requirement Flask (from -r requirements.txt (line 1)) (from versions:) 
No matching distribution found for Flask (from -r requirements.txt (line 1)) 
The command '/bin/sh -c pip install --no-cache-dir -r requirements.txt' returned a non-zero code: 1 
[email protected]:~/workspace/docker-curriculum/flask-app$

我已经采取了看看这个stackoverflow solution。这些答案似乎已经解决了许多人无法与域名服务器（DNS）连接的问题，但重置码头或添加DNS到/etc/dhcp/dhclient.conf没有为我做任何事情。

我已经安装了Docker版本17.09.0-ce并且在Ubuntu 16.04上运行，有什么想法？

来源

2017-10-11 Max

@JanezKuhar这似乎不是问题，因为我正在拉一个'用户图像'，它就像克隆某人的存储库。我也尝试了你的解决方案，这导致了相同的结果 – Max

错误信息表明尝试访问https://pypi.python.org/pypi时出现连接错误。您正在构建图像的机器是否可以连接到该网站？ – jwodder

不，我不能。本质上问题是我无法连接到服务器，因为我的机器找不到正确的DNS。但在SO解决方案中尝试解决方案后，我仍然无法连接 – Max

如果您正在使用代理服务器。码头集装箱根本无法到达互联网的可能性很大。

您可以通过运行

$ docker run -it busybox sh 
/# ping google.com

如果它挂你知道你有一个问题进行测试。现在我们必须找到主机用来连接互联网的网络接口。 ipconfig会给你一个名字列表，无论哪一个用来连接互联网都是你的IFACENAME。现在运行：

$ nmcli dev list | grep 'IP4.DNS'     # Ubuntu <= 14 
$ nmcli device show IFACENAME | grep IP4.DNS   # Ubuntu >= 15

这将列出您的代理服务器所在的IP_ADDRESS。可能有1个以上，只是使用第一个。使用以下内容创建文件/etc/docker/daemon.json：

{ 
    "dns": ["IP_ADDRESS", "8.8.8.8"] 
}

最后，

$ sudo service docker restart

现在，您应该能够从一个容器内ping通。

来源

2017-10-11 21:58:35 Max

Docker课程教程，python pip失败

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