Solve the DNS issue when play docker on ubuntu
Docker 在Ubuntu上面的dns問題
Issue description
Recently, I met an issue during dockerfile building. When I try to build a docker image on Ubuntu 16.04.3, it always failed. After a few checking, I found that the DNS does not work in container.
The impact is that, if my dockerfile has update actions (apt updat/apk update), it never works. In this case, I can't install any software during docker image building.
Environment
Ubuntu 16.04.3
docker-ce 17.09.0-ce
Solve docker DNS issue on ubuntu
I checked many solution online, there is a simple way to solve this.
- Check you local DNS
nmcli dev show|grep "IP4.DNS"
IP4.DNS[1]: xxx.xxx.xxx.xxx
- Create or modify /etc/docker/daemon.json
sudo vim /etc/docker/daemon.json
{
"dns": ["xxx.xxx.xxx.xxx","8.8.8.8"]
}
- Restart docker service
sudo service docker restart
Extend learning
How docker DNS works? see this article
