docker生成镜像时无法安装flask

来源：2-4 Vagrant&VirtualBox for Mac

悬崖蓝枫

2020-07-01

WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by ‘NewConnectionError(’<pip._vendor.urllib3.connection.VerifiedHTTPSConnection object at 0x7ffaec8ef730>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution’)’: /simple/flask/

百度了网上的办法，在机器加了nameserver 8.8.8.8，并重启了docker，依然报错，但是在宿主机可以正常安装的，在镜像中就不能装，请求老师解答，我用的时阿里云主机，centos8 64位操作系统，初步判断是容器连不上网，但是尝试网上的解决办法无果

FROM python:3 # 引入python3镜像
LABEL maintainer="XXXXX” #写明dockerfile信息
RUN pip3 install flask #安装flask
COPY hello.py /app/ #把当期目录的hello.py 添加到/app/目录下
WORKDIR /app # 切换到app目录
EXPOSE 5000 # 向往暴露5000端口
CMD [“python3”,"hello.py”] #执行hello.py

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4回答

weixin_慕仙4431864

2020-10-12

我也遇到这个问题，service docker restart重启下

麦兜搞IT

问题解决了么？有点奇怪

2020-10-13

共1条回复

麦兜搞IT

2020-07-16

那您再查一下防火墙的NAT规则？具体方法见https://docker-k8s-lab.readthedocs.io/en/latest/docker/bridged-network.html#nat

悬崖蓝枫

[root@iZm5eg5ahlkal89kmgeqpcZ ~]# ifconfig docker0: flags=4163 mtu 1500 inet 172.17.0.1 netmask 255.255.0.0 broadcast 172.17.255.255 inet6 fe80::42:c4ff:fe53:ad9e prefixlen 64 scopeid 0x20 ether 02:42:c4:53:ad:9e txqueuelen 0 (Ethernet) RX packets 1083 bytes 56934 (55.5 KiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 1242 bytes 104725 (102.2 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 eth0: flags=4163 mtu 1500 inet 172.31.171.191 netmask 255.255.240.0 broadcast 172.31.175.255 inet6 fe80::216:3eff:fe04:310f prefixlen 64 scopeid 0x20 ether 00:16:3e:04:31:0f txqueuelen 1000 (Ethernet) RX packets 8810873 bytes 4019267453 (3.7 GiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 6809206 bytes 5006028415 (4.6 GiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

2020-08-04

共2条回复

麦兜搞IT

2020-07-04

您如果是使用一些image直接创建container，比如centos，进到container内部，在里面能访问外网么？比如ping baidu之类的

悬崖蓝枫

麦兜搞IT

试了一下是可以ping通的，截图放在提问里了

2020-07-13

共3条回复

麦兜搞IT

2020-07-04