Can't install pip packages inside a docker con

Question

I'm following the fig guide to using docker with a python application, but when docker gets up to the command

RUN pip install -r requirements.txt

I get the following error message:

Step 3 : RUN pip install -r requirements.txt
 ---> Running in fe0b84217ad1
Collecting blinker==1.3 (from -r requirements.txt (line 1))
  Retrying (Retry(total=4, connect=None, read=None, redirect=None)) after connection broken by 'ProtocolError('Connection aborted.', gaierror(-2, 'Name or service not known'))': /simple/blinker/

This repeats several times and then I get another message:

Could not find any downloads that satisfy the requirement blinker==1.3 (from -r requirements.txt (line 1))
  No distributions at all found for blinker==1.3 (from -r requirements.txt (line 1))

So for some reason pip can't access any packages from inside a docker container. Is there anything I need to do to allow it internet access?

However pip works fine to install things outside of the docker container, and worked fine even with that exact package (blinker==1.3) so that's not the problem. Also this problem isn't specific to that package. I get the same issue with any pip install command for any package.

Does anyone have any idea what's going on here?

Answer 1

In my case, with docker version 1.13.0 and docker-machine 0.9.0 under Ubuntu 16.04 I had to modify slightly Tanzaho's answer (2. Modifying Docker config) as follows:

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

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

   sudo vim /etc/default/docker
   

3. Add the following setting for Docker.

   DOCKER_OPTS="--dns 8.8.8.8 --dns 8.8.4.4"
   

4. Save and close the file.

5. Restart the Docker daemon :

   sudo service docker restart
   

Answer 2

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

Answer 3

I had same problem.The cause of error is proxy.

So, I edit Dockerfile following

RUN pip install -r /app/requirements.txt --proxy=http://user:pass@addr:port

Answer 4

For me, it was caused by being connected to my university VPN. Disconnecting "solved" the problem.

Answer 5

For me, I was unable to install pip due to the docker's DNS not configured properly. I've tried the above steps, however, configuring docker DNS to Google DNS does not work for my laptop. Docker's DNS can be properly configured only if I set its DNS to my laptop's assigned IP.

If you use Ubuntu, you can use the following steps to configure your docker's DNS:

1. Find out your device's assigned IP. You can find this by either

   • Checking the inet addr of your ethernet or wlan in ifconfig
   • Choosing any address in nmcli dev list | grep 'DNS'

2. Change dns in /etc/docker/daemon.json

   {
       "dns": ["your_ip_in_step_1"]
   }
   

3. Restart docker: sudo service docker restart

Answer 6

I do not know the reason, but the error means that pip is trying to resolve the /simple/blinker/ as a DNS hostname instead of the pypi.python.org part, which seems very odd since I cannot even come up with any URL for which urlparse could return such a string as a hostname part. I'd check if there is some problem with ~/.pip/pip.conf