Docker容器化部署Python应用执行docker build命令生成docker容器报错:Smporary failure in name resolution

问题简述

因项目需求python项目需要使用Docker容器化部署，Dockerfile文件编辑内容如下：

FROM python:3.6.10
RUN mkdir /usr/src/myapp -p
COPY . /usr/src/myapp
WORKDIR /usr/src/myapp
RUN pip3 install -r requirements.txt
WORKDIR /usr/src/myapp/ETLProject
CMD python manage.py runserver 0:8888

执行docker build命令时到pip3 install -r requirements.txt发生报错

报错信息

WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.VerifiedHTTPSmporary failure in name resolution',)': /simple/some-package/

问题原因

Docker未使用正确的DNS设定造成解析错误

解决方式

指定Docker使用的DNS

1. 打开/etc/default/docker

vim /etc/default/docker

2. 更改 DNS 設定

DOCKER_OPTS="--dns 8.8.8.8"

3. 重启docker

systemctl restart docker

4.再次执行docker build命令成功生成容器ID如下：