Docker 內pip安裝package報錯: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution'

說來奇幻(對本菜來說, 經常遇到堪稱奇幻的問題)

之前在docker里面各種安裝都沒問題, 也不知道什么引起的, 昨天晚上調試的時候卸載了一個包的版本,然后就安不上了.

宿主機安裝依然各種流暢,唯獨docker容器不行.

網上找了許多方法, 最后在 /etc/resolv.conf 文件內添加如下的代碼解決了:

nameserver 8.8.8.8

https://blog.csdn.net/qq_17351077/article/details/77498173

上面的博客提到了這個方法,但是不明白什么原因, 所以就沒試, 然后在

https://stackoverflow.com/questions/28668180/cant-install-pip-packages-inside-a-docker-container-with-ubuntu/41989423

上又找到了同樣的方案,這次這哥們給了點說明:  Docker沒有使用正確的DNS服務器。將谷歌的DNS服務器地址 添加到那個配置文件

Your problem comes from the fact that Docker is not using the proper DNS server. You can fix it in three different ways :

1. Adding Google DNS to your local config

Modifying /etc/resolv.conf and adding the following lines at the end

# Google IPv4 nameservers nameserver 8.8.8.8 nameserver 8.8.4.4

If you want to add other DNS servers, have a look here.

However this change won't be permanent (see this thread). To make it permanent : $ sudo nano /etc/dhcp/dhclient.conf Uncomment and edit the line with prepend domain-name-server : prepend domain-name-servers 8.8.8.8, 8.8.4.4;

Restart dhclient : $ sudo dhclient.

2. Modifying Docker config

As explained in the docs :

Systems that run Ubuntu or an Ubuntu derivative on the desktop typically use 127.0.0.1 as the default nameserver in /etc/resolv.conf file.

To specify a DNS server for use by Docker :

1. Log into Ubuntu as a user with sudo privileges.

2. Open the /etc/default/docker file for editing :

    $ sudo nano /etc/default/docker

3. Add the following setting for Docker.

    DOCKER_OPTS="--dns 8.8.8.8"

4. Save and close the file.

5. Restart the Docker daemon :

    $ sudo systemctl restart docker

3. Using a parameter when you run Docker

When you run docker, simply add the following parameter : --dns 8.8.8.8

 

我是用的第一個方法, 雖然解決了, 但是為什么之前都沒出現這個問題呢?

我服務器默認的是阿里雲的DNS服務器地址, 查看了下我的電腦虛擬機的,用的是虛擬的局域網IP地址,

docker會繼承宿主機的DNS服務器地址,難不成是阿里雲的DNS服務器的問題?但是我宿主機沒事