Home made dyndns service based on dnsmasq (resolver), php/httpd (registering server) and curl (registering client)
You don't have control over DHCP and/or dns and want your vms to be accesible by name? Want to skip the hurdle of associating MACs with ips in DHCP or similar hurdles for the random MACs of vms? Just use a local dns resolver (that can also do caching) in a minimal cpu/memory print
- Configure dnsmasq 1.1 Have in dnsmasq config the following : Have /etc/resolv_dnsmasq.conf contain a local resolver (optional) and some global ones (8.8.8.8) : resolv-file=/etc/resolv_dnsmasq.conf strict-order # parse /etc/resolv.conf in order conf-dir=/etc/dnsmasq.d # parse declarations in this director. !!! N.B.!!! to be writeable by http (see step 3) make it root:apache 775
1.2 have in /etc/resolv.conf : nameserver 127.0.0.1
one could add other backup nameservers (in case the local dnsmasq is not running)
-
Make sure dnsmasq is restarted each time content of /etc/dnsmasq.d is modified - only for systemd copy dnsmasq_restarter.path and dnsmasq_restarter.service in /etc/systemd/system systemctl enable --now dnsmasq_restarter.path dnsmasq_restarter.service
-
Serve by a php enabled server the contents of www_html_dnsmasq : a php that writes a pair of name/ip in /etc/dnsmasq.d (the regex should validate the hostname) and an necessary .htacess (no one wants headaches - the included one have format for apache 2.4)
-
Because is possible to have my network configuration mechanisms (ifcfg-, NetworkManager, systemd-networkd) the most common way to register the ip would be through crond so just put regip in /root/bin and see regip_install for creating the /etc/cron.d/regip file
if vm/kickstarted machine have multiple ips, curl have the option "--interface" that takes either an interface name or an ip.