Installs dnsmasq into an Alpine Linux container

Dnsmasq provides network infrastructure for small networks: DNS, DHCP, router advertisement and network boot. It is designed to be lightweight and have a small footprint, suitable for resource constrained routers and firewalls.

http://www.thekelleys.org.uk/dnsmasq/doc.html

docker create --name=dnsmasq  \
  -v /etc/localtime:/etc/localtime:ro \
  -v <path to dnsmasq config>:/etc/dnsmasq.d \
  -e DOCKUID=<UID default:10015> \
  -e DOCKGID=<GID default:10015> \
  -e DOCKDROPRIV=<0|1 default:0> \
  -e DOCKDNSCACHE=<integer default:150> \
  -e DOCKDNS1=<ip default:8.8.8.8> \
  -e DOCKDNS2=<ip default:8.8.4.4> \
  -p 53:<53 or 5353 default:53>/udp digrouz/docker-alp-dnsmasq dnsmasq

When you start the dnsmasq image, you can adjust the configuration of the dnsmasq instance by passing one or more environment variables on the docker run command line.

This variable is not mandatory and specifies the user id that will be set to run the application. It has default value 10015.

This variable is not mandatory and specifies the group id that will be set to run the application. It has default value 10015.

This variable allows to run dnsmasq with an unprivilegied user inside the container. Due to what unprivilegied run means, if this variable set to 1, dnsmasq will listen to port 5353 otherwise the default port 53 will be used. It has default value 0.

This variable is not mandatory and specifies the size of dnsmasq's cache. Setting the cache size to zero disables caching. The default is 150.

This variable is not mandatory and specifies the primary name server that will be use to foward requests. It has default value 8.8.8.8.

This variable is not mandatory and specifies the secondary name server that will be use to foward requests. It has default value 8.8.4.4.

• The docker entrypoint will upgrade operating system at each startup.