无法建立新连接：[Errno -2]名称或服务未知'，'）：/ simple / flask /

Question

Docker在运行“RUN pip install flask”时失败，Docker文件的内容如下：

FROM python:3.4

RUN mkdir /code

COPY app.py /code/app.py

WORKDIR /code

RUN pip install flask redis

CMD ['python', 'app.py']

**When I run in the terminal : "$ sudo docker build -t fig_ex .", it shows:**

Sending build context to Docker daemon 3.072 kB

Step 1 : FROM python:3.4

---> d87c6dbd17a7

Step 2 : RUN mkdir /code

---> Using cache

---> 4049bfe07335

Step 3 : COPY app.py /code/app.py

---> Using cache

---> bbe0353172b6

Step 4 : WORKDIR /code

---> Using cache

---> 2535608c604c

Step 5 : RUN pip install flask redis

---> Running in 4a49dee8c8b1

收集烧瓶

Retrying (Retry(total=4, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7f0f88deec18>: Failed to establish a new connection: [Errno -2] Name or service not known',)': /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 0x7f0f88dee2b0>: Failed to establish a new connection: [Errno -2] Name or service not known',)': /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 0x7f0f88dee908>: Failed to establish a new connection: [Errno -2] Name or service not known',)': /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 0x7f0f88dd0978>: Failed to establish a new connection: [Errno -2] Name or service not known',)': /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 0x7f0f8914d630>: Failed to establish a new connection: [Errno -2] Name or service not known',)': /simple/flask/

无法找到满足要求瓶的版本（来自版本:)

找不到烧瓶的匹配分布

命令'/ bin / sh -c pip install flask redis'返回非零代码：1

我重启了所有内容，但仍然出现错误。 我的泊坞版版本是1.12.3。

谢谢！

Answer 1

对于Ubuntu用户

您需要在docker config

中添加新的DNS地址

1. sudo nano /lib/systemd/system/docker.service 在ExecStar之后添加dns。 --dns 10.252.252.252 --dns 10.253.253.253 看起来应该是这样的： ExecStart=/usr/bin/dockerd -H fd:// --dns 10.252.252.252 --dns 10.253.253.253

2. systemctl daemon-reload

3. sudo service docker restart
4. 应该工作