On Fri, Feb 11, 2022 at 12:16:52AM +0100, Petr Menšík wrote: > On 2/10/22 22:33, Chris Green wrote: > > As per the subject when does dnsmasq [re]read the leases file? > > > > I am experimenting with my backup DHCP/DNS strategy and I have just > > stopped my dnsmasq server and started another listening on the first > > dnsmasq server's IP address. It's working OK'ish. However the new > > dnsmasq server doesn't (of course) know the name/IP pairs that the old > > dnsmasq server had in its memory. > > > > If I had copied the dnsmasq.lease file across from the old server to > > the new one would that help? Is there some way to tell dnsmasq to > > reload its memory from the file? If dnsmasq is restarted (e.g. by > > systemd) does it read the dnsmasq.leases file? > > > When it starts. It has own data stored in-memory and just rewrites lease > file. It would not read any new leases from it if some other service > pushed them there. If dnsmasq is restarted, it starts a new process. It > has to read all configuration all again, which has to be done for leases. > So does that mean there's no way to 'warm start' an instance of dnsmasq with a set of leases?
Surely when dnsmasq is stopped and then started it reads it's previous leases file so that it still knows the names/IPs of systems that it has provided IPs for. So if I copy that leases file to another system and start a copy of dnsmasq there (with same configuration as the one it's replacing) won't it read that leases file? -- Chris Green _______________________________________________ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/dnsmasq-discuss
