6 solutions to the problem of no Internet access in Docker containers

Note: The following method is a solution that allows you to ping the public IP in the container. If you cannot ping the public IP, the host may not be able to access the Internet (try ping 8.8.8.8).

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1. Use the –net:host option

 sudo docker run –net:host –name ubuntu_bash -i -t ubuntu:latest /bin/bash

2. Use the –dns option

 sudo docker run –dns 8.8.8.8–dns 8.8.4.4–name ubuntu_bash -i -t ubuntu:latest /bin/bash

3. Change DNS server

 vi /etc/default/docker
 # Remove the # sign before “ docker_OPTS =”–dns 8.8.8.8 –dns 8.8.4.4″”

4. No need for dnsmasq

 vi /etc/
 NetworkManager
 /
 NetworkManager
 .conf
 # Add a # before dns = dnsmasq to comment it out, then 
 
 sudo restart network-manager
 sudo restart docker

5. Rebuild the docker0 network

 pkill docker
 iptables -t nat -F
 ifconfig docker0 down
 brctl delbr docker0
 docker -d

6. Modify /etc/hosts directly in docker