On 05/25/2016 11:25 AM, Chuck Lever wrote: > >> On May 25, 2016, at 8:14 AM, Steve Dickson <SteveD@xxxxxxxxxx> wrote: >> Does that even work? How can you have multiple domains >> on the same host? > > Which interface is used for the TXT record query? I'm assuming the interfaces in /etc/resolv.conf > If a system is on multiple networks with their > own DNS services, it is possible for them to see > a different TXT lookup result depending on which > interfaces happen to be up when the query is done, > and what DNS service has been set up by DHCP. >From my understand of the BIND api, which is very limited, domain names and field names are use to do lookups. Not interfaces. > > >> I would say we document the fact the first TXT record >> processed is the one we go with. All others are ignored. > > Can that value be guaranteed to be the same after > every boot, even in the face of things like changing > order of interface bring-up and DHCP? none... we are asking for a TXT record called _nfsv4idmapdomain for from a particular domain. why would we care what interface it comes from? > > The problem with "first TXT record processed" is that > the order these records are processed can change, and > thus the ID mapping domain name is potentially > different after every boot. > > I think none of the automated mechanisms are 100% > reliable in this scenario, so the best that can be > done is to use the Domain setting in idmapd.conf. > But admins generally ignore this and hilarity ensues. > > It may not be possible to solve it, but at least we > should provide tools for tracking down the issue if > it should occur. Maybe start by reporting the system's > ID mapping domain setting in the system log at boot > time, and how it was derived. I think this is a phase two thing... Lets the the core up and working and then go from there. steved. -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
