Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On 09/06/2011 01:07 PM, Lars Ellenberg wrote: > On Tue, Sep 06, 2011 at 12:06:05PM -0400, Digimer wrote: >> I find myself setting up clusters in one location, then moving them to a >> second location which requires a new set of IPs. With the other cluster >> applications, this is not a problem because I can use resolvable names >> and update just /etc/hosts. However, this doesn't seem to be possible in >> DRBD. >> >> Am I missing something obvious? If it is possible, please let me know. >> >> If it's not possible, may I ask why not? Would it be possible to request >> this ability as a feature request for a future release? > > drbdsetup already does a lookup, and we likely will relax the parser to > allow hostnames instead of IP addresses as well "soon". > > The basic problem: if the link goes away because of one node chaning its > IP, we cannot possibly do a dns lookup from kernel space... > Well, we could. But that would be a good reason to kick us out of the > kernel and never talk to us again ;) > > So what you would need to do, if you expect the IP to change, > is to "periodically" run drbdadm adjust, just in case. > Or ask your cloud provider for persistent addresses... > > If you do not expect the IP to change "at random", just wait a bit, as I > said this will likely show up as a "convenience" feature" in the near > future. Thanks for the explanation. In my case, this isn't in the cloud. It's much more benal in that I tend to move clusters between my office and my home lab for various reasons, and they use different IP space. Really, I should make them compatible, but that's all secondary to the curiosity of why I couldn't use hostnames. DNS lookups in kernel space makes sense though. :) -- Digimer E-Mail: digimer at alteeve.com Freenode handle: digimer Papers and Projects: http://alteeve.com Node Assassin: http://nodeassassin.org "At what point did we forget that the Space Shuttle was, essentially, a program that strapped human beings to an explosion and tried to stab through the sky with fire and math?"