I've Python 3 running in a linux server. I need to install some libraries (obviously) so I'm trying :
pip3 install numpyWhich, is resulting in the following error:
Collecting numpy Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x7f7542572828>: Failed to establish a new connection: [Errno -2] Name or service not known',)': /simple/numpy/ Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x7f7542572eb8>: Failed to establish a new connection: [Errno -2] Name or service not known',)': /simple/numpy/ Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x7f7542572be0>: Failed to establish a new connection: [Errno -2] Name or service not known',)': /simple/numpy/ Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x7f7542572d30>: Failed to establish a new connection: [Errno -2] Name or service not known',)': /simple/numpy/ Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x7f7542572860>: Failed to establish a new connection: [Errno -2] Name or service not known',)': /simple/numpy/ Could not find a version that satisfies the requirement numpy (from versions: )
No matching distribution found for numpyQuestions:
- What could be the problem? Why is this error being raised?
- How can this be avoided in the future?
Feel free to ask for more details.
UPDATE:I tried ping google.com and got the error:
ping: google.com: Name or service not knownBut when I tried ping 8.8.8.8, I got:
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=118 time=10.8 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=118 time=10.6 ms
64 bytes from 8.8.8.8: icmp_seq=3 ttl=118 time=10.6 ms
64 bytes from 8.8.8.8: icmp_seq=4 ttl=118 time=10.7 ms
64 bytes from 8.8.8.8: icmp_seq=5 ttl=118 time=10.6 ms
64 bytes from 8.8.8.8: icmp_seq=6 ttl=118 time=10.7 ms
64 bytes from 8.8.8.8: icmp_seq=7 ttl=118 time=10.7 ms
64 bytes from 8.8.8.8: icmp_seq=8 ttl=118 time=10.7 ms
64 bytes from 8.8.8.8: icmp_seq=9 ttl=118 time=10.7 ms
64 bytes from 8.8.8.8: icmp_seq=10 ttl=118 time=10.7 ms
64 bytes from 8.8.8.8: icmp_seq=11 ttl=118 time=10.7 ms
64 bytes from 8.8.8.8: icmp_seq=12 ttl=118 time=10.8 ms
64 bytes from 8.8.8.8: icmp_seq=13 ttl=118 time=10.7 ms
64 bytes from 8.8.8.8: icmp_seq=14 ttl=118 time=10.7 ms
64 bytes from 8.8.8.8: icmp_seq=15 ttl=118 time=10.7 ms
64 bytes from 8.8.8.8: icmp_seq=16 ttl=118 time=10.7 ms
64 bytes from 8.8.8.8: icmp_seq=17 ttl=118 time=10.6 ms
64 bytes from 8.8.8.8: icmp_seq=18 ttl=118 time=10.7 ms
64 bytes from 8.8.8.8: icmp_seq=19 ttl=118 time=10.6 ms
64 bytes from 8.8.8.8: icmp_seq=20 ttl=118 time=10.7 ms
64 bytes from 8.8.8.8: icmp_seq=21 ttl=118 time=10.7 ms
64 bytes from 8.8.8.8: icmp_seq=22 ttl=118 time=10.7 ms
64 bytes from 8.8.8.8: icmp_seq=23 ttl=118 time=10.7 ms
64 bytes from 8.8.8.8: icmp_seq=24 ttl=118 time=10.7 ms
64 bytes from 8.8.8.8: icmp_seq=25 ttl=118 time=10.7 ms
64 bytes from 8.8.8.8: icmp_seq=26 ttl=118 time=10.7 ms
^C
--- 8.8.8.8 ping statistics ---
26 packets transmitted, 26 received, 0% packet loss, time 25046ms
rtt min/avg/max/mdev = 10.655/10.731/10.827/0.073 msA problem with DNS maybe? What should I do?
19 Answers
All I had to do was add nameserver 8.8.8.8 to the /etc/resolv.conf file. 8.8.8.8 is Google's public free DNS server's IP. So, since a system must know the IP address of a domain name, we have to give it a way to do just that. A public DNS server provides this binding of a domain name to the IP address.
For Windows 10 User, Go to Settings -> Network and Internet -> Proxy
Disable Automatically detect settings
If using proxy network and facing same issue then use
pip install --proxy="proxy:portno" numpy
Foe example:
2C:\Users\Dell>pip install --proxy="10.50.225.80:3128" numpy
Check the proxy configuration inside proxy settings. Then use :
pip install --proxy= numpy(Python package name)I have this problem when I use VPN. Not sure what's the reason for this, but switching it off solves the problem.
Not an answer to the original question.
Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x7f7542572828>: Failed to establish a new connection: [Errno -2] Name or service not known',)':The same warning occurs to me when I was writing Dockerfile.
Obviously, it's the network problem.
However, the result of DNS and ping from host to pip source is fine.
Eventually, I deleted the Dockerfile from the start of the pip part to the end.
After I exec into the container, the network is unable to get the DNS server.
Remind by my coworker, there was a change about iptables.
When a change made to iptables, the server needs to restart the docker engine to make it work.
It could be but not limit to sudo service docker restart
However, hope this answer could save some others' time.
I just restarted the network services and then did docker restart. Commands used:
systemctl restart NetworkManager.service
sudo service docker restartYou can close all your proxy programs and leave the Windows proxy section blank. I had this problem with Lantern and Psiphon.
I had this problem on Raspbian 10 after intalling network-manager following the instructions in this link:
After undoing following step, DNS works again!
sudo ln -sf /run/resolvconf/resolv.conf /etc/resolv.conf
(luckily I saved the original file!)
