smallDNS - Simple multi-agent locally listable DNS

Super simple DNS implementation where each machine pings the master server with it's hostname and ip address.

The server stores keeps a locally hosted, file based, DNS map which stores the mapping from hostnames to ip addresses.

The client scripts ping the server if they notice a change in ip address (either from reboot or lease renewal).

Features:

• Client scripts can be deployed on multiple agents without any setup
• Server keeps track of any agents that have been added
• Client will only ping the server if a change is noticed
• Server can generate a hosts file that can be merged with /etc/hosts

Limitations:

• The server needs to have a static ip address that must be configured in the client script

Requirements:

• Go (server)
• Bash, wget (client)

Command Line Arguments:

• -debug prints debug information
• -udp pings with udp instead of icmp (doesn't require root, but doesn't seem to work on linux)
• -port <port number> serves on the specified port (default 7979)

Suggested deployment:

• Run dnsServer.go on server
• Set up cron job to execute pingDNS.sh at a reasonable interval (example in crontab.entry)