Can't install pip packages inside a docker container with Ubuntu

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


        

Answer 1

ok, restarting my docker-machine is solving the problem. thanks – ismailsunni

This was the solution for me:

docker-machine restart <machine-name>

Answer 2

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 3

Im new to Docker and tried all the methods mentioned here, but still didn't get it right. the Docker version was 18, and ubuntu version was 16. I tried this method:- First i was building docker with company's internet network. this network is blocking some sites or some how things didnt go well here. So secondly i connected to my very own network(which im using in mobile phone, for example) and tried. things went right. requirement.txt was installed successfully, and docker was build.

Answer 4

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 5

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 6

For me simply restarting docker daemon helped.

service docker restart