docker容器中不能上網的一種解決方法

After A LOT of time trying to solve this issue I think I finally
found a solution in an ebook I found on the internet.

Here's the steps I took to solve the issue:

$ sudo service docker stop
$ sudo nano /etc/default/docker

Edit the file and uncomment the DOCKER_OPTS option modifying it to somthing like this:
DOCKER_OPTS="--dns 8.8.8.8 --dns 8.8.4.4 --iptables=false --ip-forward=false"

$ sudo su
$ echo 1 > /proc/sys/net/ipv4/ip_forward
// Add the IP range you want to have access to the internet
$ iptables -t nat -A POSTROUTING -s 172.17.0.0/16 -j MASQUERADE
$ service docker restart
$ exit

Now hopefully your containers have access to the internet again.

I hope to help someone :)
轉載自github:
https://github.com/moby/moby/issues/36151#issuecomment-630548256