feat: support for VIP with keepalived - Githubissues

DrPsychick / docker-dnsmasq

dnsmasq docker image, fully configurable through ENV

GNU General Public License v3.0

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feat: support for VIP with keepalived #34

Open DrPsychick opened 1 week ago

DrPsychick commented 1 week ago

Purpose: Cheap way to have a "High availability" setup of DNS/DHCP with dnsmasq

Idea:

two dnsmasq container instances, each with an individual IP
a shared VIP controlled through keepalived which is used for DNS/DHCP
if the master fails, the backup takes over the VIP and serves DNS/DHCP requests

Know issues:

DHCP leases file is not shared, so clients will get a new lease (might cause a short connectivity interruption)
Communication to/from the host to the container through macvlan is not possible out of the box (has been the case before as well). This post might help: https://blog.oddbit.com/post/2018-03-12-using-docker-macvlan-networks/#host-access

Further reading on scripts for keepalived: https://tobrunet.ch/keepalived-check-and-notify-scripts/

DrPsychick commented 1 week ago

Ready to be merged, testing it and leaving this open for a while to get community feedback.

Impact: increases container size a bit, but does change default behaviour.

To try it out, simply use drpsychick/dnsmasq:latest-dev