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

I needed to add --network=host to my docker build command:

docker build --network=host -t image_name .

Answer 2

In case someone is reading this using docker-compose. I managed to resolve this by changing my yaml file as follows

version: 3.4
service: my-app
  build:
  context: .
  network: host

which is equivalent to writing

docker build . --network host

Answer 3

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

Answer 4

Configuring docker DNS to Google DNS (8.8.8.8) or 10.0.0.2 did not work in my company environment.

Running: $ drill @8.8.8.8 www.amazon.com or @10.0.0.2 confirmed this.

In order to find a DNS that would work I ran: $ drill www.amazon.com and it gave me the DNS IP that is being used in my network.

Then I set it in Ubuntu using the following step to configure docker's DNS.

Changed dns in /etc/docker/daemon.json

{
    "dns": ["the DNS ip from step1"]
}

Restart docker: sudo service docker restart

Answer 5

For Ubuntu users

You need to add new DNS addresses in the docker config

sudo nano /lib/systemd/system/docker.service

Add the dns after ExecStar.

--dns 10.252.252.252 --dns 10.253.253.253

Should look like that:

ExecStart=/usr/bin/dockerd -H fd:// --dns 10.252.252.252 --dns 10.253.253.253

Then do:

systemctl daemon-reload
sudo service docker restart

Should work.

Answer 6

Let it run. Sometimes pypi is having connection issues which are noisily put in your face to make you think it is broke. Just to be sure, let it roll, you might find it works it out for itself.

The bottom line, despite these red error lines, is "Successfully built"

$ docker build .
Sending build context to Docker daemon 2.048 kB
Step 1 : FROM docker-registry.aws.example.com:5000/cmcrc/python2:20160517120608
 ---> 1e5034711aa9
Step 2 : RUN pip install prometheus-client requests
 ---> Running in f3c580fc93ae
Collecting prometheus-client
  Retrying (Retry(total=4, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.HTTPConnection object at 0x7fe15a1d8610>: Failed to establish a new connection: [Errno -2] Name or service not known',)': /pypi/prometheus-client/
  Retrying (Retry(total=3, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.HTTPConnection object at 0x7fe15a1d87d0>: Failed to establish a new connection: [Errno -2] Name or service not known',)': /pypi/prometheus-client/
  Retrying (Retry(total=2, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.HTTPConnection object at 0x7fe15a1d8990>: Failed to establish a new connection: [Errno -2] Name or service not known',)': /pypi/prometheus-client/
  Retrying (Retry(total=1, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.HTTPConnection object at 0x7fe15a1d8b50>: Failed to establish a new connection: [Errno -2] Name or service not known',)': /pypi/prometheus-client/
  Retrying (Retry(total=0, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.HTTPConnection object at 0x7fe15a1d8d10>: Failed to establish a new connection: [Errno -2] Name or service not known',)': /pypi/prometheus-client/
  Downloading prometheus_client-0.0.13.tar.gz
Collecting requests
  Retrying (Retry(total=4, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.HTTPConnection object at 0x7fe159e9d4d0>: Failed to establish a new connection: [Errno -2] Name or service not known',)': /pypi/requests/
  Retrying (Retry(total=3, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.HTTPConnection object at 0x7fe159e9da10>: Failed to establish a new connection: [Errno -2] Name or service not known',)': /pypi/requests/
  Retrying (Retry(total=2, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.HTTPConnection object at 0x7fe159e9dc50>: Failed to establish a new connection: [Errno -2] Name or service not known',)': /pypi/requests/
  Retrying (Retry(total=1, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.HTTPConnection object at 0x7fe159e9de10>: Failed to establish a new connection: [Errno -2] Name or service not known',)': /pypi/requests/
  Retrying (Retry(total=0, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.HTTPConnection object at 0x7fe159e9dfd0>: Failed to establish a new connection: [Errno -2] Name or service not known',)': /pypi/requests/
  Downloading requests-2.10.0-py2.py3-none-any.whl (506kB)
Building wheels for collected packages: prometheus-client
  Running setup.py bdist_wheel for prometheus-client: started
  Running setup.py bdist_wheel for prometheus-client: finished with status 'done'
  Stored in directory: /root/.cache/pip/wheels/04/94/f5/b803b2ff65e8344e99ca99b7f7cb8194224017167809a32b78
Successfully built prometheus-client
Installing collected packages: prometheus-client, requests
Successfully installed prometheus-client-0.0.13 requests-2.10.0
 ---> 19c5e3cfe08f
Removing intermediate container f3c580fc93ae
Successfully built 19c5e3cfe08f