Temporary failure resolving ‘mirrors.163.com‘

Err:4 http://mirrors.163/debian-security buster/updates InRelease
  Temporary failure resolving 'mirrors.163'
Reading package lists...
W: Failed to fetch http://mirrors.163/debian/dists/buster/InRelease  Temporary failure resolving 'mirrors.163'
W: Failed to fetch http://mirrors.163/debian/dists/buster-updates/InRelease  Temporary failure resolving 'mirrors.163'
W: Failed to fetch http://mirrors.163/debian/dists/buster-backports/InRelease  Temporary failure resolving 'mirrors.163'
W: Failed to fetch http://mirrors.163/debian-security/dists/buster/updates/InRelease  Temporary failure resolving 'mirrors.163'
W: Some index files failed to download. They have been ignored, or old ones used instead.

解决办法：

touch daemon.json
{                                                                          
    "dns": ["8.8.8.8", "114.114.114.114"]                                                                           
}   
sudo service docker restart