On Thu, 2 Mar 2017, Xiaoxi Chen wrote: > >Still applies. Just create a Round Robin DNS record. The clients will > obtain a new monmap while they are connected to the cluster. > It works to some extent, but causing issue for "mount -a". We have such > deployment nowaday, a GTM(kinds of dns) record created with all MDS ips and > it works fine in terms of failover/ mount. > > But, user usually automation such mount by fstab and even, "mount -a " are > periodically called. With such DNS approach above, they will get mount point > busy message every time. Just due to mount.ceph resolve the DNS name to > another IP, and kernel client was feeling like you are trying to attach > another fs... The kernel client is (should be!) smart enough to tell that it is the same mount point and will share the superblock. If you see a problem here it's a bug. sage > > > 2017-03-02 0:29 GMT+08:00 Wido den Hollander <wido@xxxxxxxx>: > > > Op 1 maart 2017 om 16:57 schreef Sage Weil > <sage@xxxxxxxxxxxx>: > > > > > > On Wed, 1 Mar 2017, Wido den Hollander wrote: > > > > Op 1 maart 2017 om 15:40 schreef Xiaoxi Chen > <superdebuger@xxxxxxxxx>: > > > > > > > > > > > > Well , I think the argument here is not all about security > gain, it just > > > > NOT a user friendly way to let "df" show out 7 IPs of > monitors....Much > > > > better if they seeing something like > "mycephfs.mydomain.com". > > > > > > > > > > mount / df simply prints the monmap. It doesn't print what > you added when you mounted the filesystem. > > > > > > Totally normal behavior. > > > > Yep. This *could* be changed, though: modern kernels have DNS > resolution > > capability. Not sure if all distros compile it in, but if so, > mount.ceph > > could first try to pass in the DNS name and only do the DNS > resolution if > > the kernel can't. And the kernel client could be updated to > remember the > > DNS name and use that. It's a bit friendlier, but imprecise, > since DNS > > might change. What does NFS do in this case? (Show an IP or a > name?) > > > > A "df" will show the entry as it's in the fstab file, but mount > will show the IPs as well. > > But Ceph is a different story here due to the monmap. > > Wido > > > sage > > > > > > > > And using DNS give you the flexibility of changing your > monitor quorum > > > > members , without notifying end user to change their fstab > entry , or > > > > whatever mount point record. > > > > > > > > > > Still applies. Just create a Round Robin DNS record. The > clients will obtain a new monmap while they are connected to the > cluster. > > > > > > Wido > > > > > > > 2017-03-01 18:46 GMT+08:00 gjprabu <gjprabu@xxxxxxxxxxxx>: > > > > > > > > > Hi Robert, > > > > > > > > > > This container host will be provided to end user and > we don't want to > > > > > expose this ip to end users. > > > > > > > > > > Regards > > > > > Prabu GJ > > > > > > > > > > > > > > > ---- On Wed, 01 Mar 2017 16:03:49 +0530 *Robert Sander > > > > > <r.sander@xxxxxxxxxxxxxxxxxxx > <r.sander@xxxxxxxxxxxxxxxxxxx>>* wrote ---- > > > > > > > > > > On 01.03.2017 10:54, gjprabu wrote: > > > > > > Hi, > > > > > > > > > > > > We try to use host name instead of ip address but > mounted partion > > > > > > showing up address only . How show the host name > instead of ip address. > > > > > > > > > > What is the security gain you try to achieve by hiding > the IPs? > > > > > > > > > > Regards > > > > > -- > > > > > Robert Sander > > > > > Heinlein Support GmbH > > > > > Schwedter Str. 8/9b, 10119 Berlin > > > > > > > > > > http://www.heinlein-support.de > > > > > > > > > > Tel: 030 / 405051-43 > > > > > Fax: 030 / 405051-19 > > > > > > > > > > Zwangsangaben lt. §35a GmbHG: > > > > > HRB 93818 B / Amtsgericht Berlin-Charlottenburg, > > > > > Geschäftsführer: Peer Heinlein -- Sitz: Berlin > > > > > > > > > > _______________________________________________ > > > > > ceph-users mailing list > > > > > ceph-users@xxxxxxxxxxxxxx > > > > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > > > > > > > > > > > > > > > > > _______________________________________________ > > > > > ceph-users mailing list > > > > > ceph-users@xxxxxxxxxxxxxx > > > > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > > > > > > > > > > > _______________________________________________ > > > > ceph-users mailing list > > > > ceph-users@xxxxxxxxxxxxxx > > > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > _______________________________________________ > > > ceph-users mailing list > > > ceph-users@xxxxxxxxxxxxxx > > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > > > >
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