Ubuntu DNS issue for Docker

 https://stackoverflow.com/questions/47580528/error-response-from-daemon-get-https-registry-1-docker-io-v2-dial-tcp-look

1. Open config file sudo nano /etc/resolv.conf and add the following under existing nameservers

   nameserver 8.8.8.8

   nameserver 8.8.4.4

2. run following commands to restart daemon and docker service

   sudo systemctl daemon-reload

   sudo systemctl restart docker