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Docker_DNS_Fix_Firewall_Hypervisor

The Docker-Deamon has problems with name resolution behind a hypervisor or a firewall. Post-Installation DNS-Fix for Docker-Deamons behind a hypervisor or a firewall. You have to execute this script as root on the VM.

Disclaimer

Please use this script only, if you know what you are doing. Using it at your own risk.

Firewall

Dont forget to edit /etc/ufw/user.rules

 ### tuple ### allow any 53 0.0.0.0/0 any 172.18.0.0/16 in
 -A ufw-user-input -p tcp --dport 53 -s 172.18.0.0/16 -j ACCEPT # Docker Network
 -A ufw-user-input -p udp --dport 53 -s 172.18.0.0/16 -j ACCEPT # Docker Network
 -A ufw-user-input -p tcp --dport 53 -s XXX.XXX.XXX.XXX/24 -j ACCEPT # Network ID
 -A ufw-user-input -p udp --dport 53 -s XXX.XXX.XXX.XXX/24 -j ACCEPT # Network ID