#ceph IRC Log

Index

IRC Log for 2016-04-19

Timestamps are in GMT/BST.

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[3:29] <alejandrito> hi, does anyone had a *GOOD* experience or knows anyone who had a good experience of using CEPH in the same hardware of an openstack compute node ?
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[3:41] <lurbs> Don't do it.
[3:42] <IvanJobs> alejandrito, you'd better not, just seperate your concerns.
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[4:23] <alejandrito> lurbs, IvanJobs haahah loved your answers !!! since hyperconvergence with CEPH is a big buzz, but .. can i have the "CEPH" reason no to do it ?
[4:24] <m0zes> because your osds will be fighting for cpu from your vms. leading to incosistent timing all around.
[4:25] <m0zes> and some of the features you would normally turn on in a vmhost actively work against performance in ceph. things like transparent hugepages. numa management, and (probably) page combining.
[4:26] <lurbs> We also managed to hit an XFS kernel bug (with Ceph) that would occasionally take down the node.
[4:27] <lurbs> Having compute on the same hardware made that a *lot* worse.
[4:27] <m0zes> lurbs: you have a reference for the bug?
[4:27] <lurbs> One sec.
[4:27] <m0zes> I like keeping track of potential issues with our setup, even if I haven't hit it.
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[4:29] <lurbs> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1527062
[4:29] <lurbs> Think it was that one.
[4:30] <m0zes> good to know. thanks
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[9:36] <masterpe> What is the best method to "rbd map" on bootup of an system so that the /dev/rbd0 device kan mount via /etc/fstab?
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[9:57] <IvanJobs> I have a question with Ceph Cluster when I add a new OSD to this cluster. the new osd is running and also add it to crush map, mark it in, but still down
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[10:04] <sep> IvanJobs, is the process running ? what does the log for that osd say ?
[10:06] <sep> masterpe, i define the image in /etc/ceph/rbdmap with lines like pool/imagename or pool/imagename@snapshotname ; one line per image. and they are automatically mapped on boot.
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[10:07] <sep> masterpe, then in fstab i have entries like /dev/rbd/poolname/imagename /mountpoint _netdev 0 0 ;; this is on debian jessie
[10:07] <sep> masterpe, not sure about "best" method, but that's how i do it.
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[10:08] <IvanJobs> I used ceph-deploy zap and osd create command, some workmate told to reboot system after all these. I'm trying this now.
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[10:09] <IvanJobs> osdmap e296: 4 osds: 3 up, 4 in; 221 remapped pgs
[10:10] <IvanJobs> after ceph-deploy zap and osd create, we should get a running osd for use right? just ceph osd in {osd id} to get it in?
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[10:12] <IvanJobs> do I need to add this new osd to crush map and explcitly ceph osd in {osd id}? I did not see mount info of my new osd in "mount" output, is it werid?
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[10:23] <sep> IvanJobs, i do not use ceph-deploy so might be some differences. but my workflow is usualy somethingh like ... check ceph osd tree, is the osd listed? ; ceph auth list, does the osd have a key ? and does it match what is in /var/lib/ceph(osd/ceph-$ID/keyring ; ps aux | grep osd.xxx is the process running ? ; mount | grep [osd id] is the disk mounted ? less /var/log/ceph/ceph-osd.id.log, have the process made any output ?
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[10:34] <masterpe> I try to start rbdmap with: "service rbdmap start
[10:34] <masterpe> "
[10:35] <masterpe> But I get the error "start: Job failed to start
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[10:36] <sep> masterpe, was it not allready started ? what does service rbdmap status say ?
[10:36] <masterpe> kernel: [ 617.883857] libceph: no secret set (for auth_x protocol)
[10:36] <masterpe> in the log
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[10:38] <sep> masterpe, the line in rbdmap can have optional arguments giving things like id and keyring
[10:39] <sep> masterpe, some od this should be useful http://www.sebastien-han.fr/blog/2013/11/22/map-slash-unmap-rbd-device-on-boot-slash-shutdown/
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[10:40] <sep> altho i did not need to download any initscript it was included in ceph-common package
[10:41] <masterpe> On the cli I used "rbd map data/elasticsearch --name client.admin --keyring /etc/ceph/keyring -m 10.114.160.50" and in the /etc/ceph/rbdmap I have "data/elasticsearch id=client1,keyring=/etc/ceph/keyring
[10:42] <masterpe> I also try to use "id=client"
[10:42] <masterpe> and id=admin.client
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[10:43] <masterpe> I probebly need to figerout what user i need to use
[10:43] <sep> my root user have access to the keyring and automatically locates it, so i only have pool/image in my file
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[10:45] <sep> probably admin since the name you used was client.admin (client is the "keytype", admin is the id/name)
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[10:53] <masterpe> I have change the id to admin
[10:53] <masterpe> And that was succesvol
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[10:55] <sep> nice :) masterpe, altho you do get a rbd0 device. i prefer to use /dev/rbd/pool/image. since those are less likely to change in case you need to edit the file in the future, or something couses one image to not map in time. etc etc
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[11:06] <masterpe> I use the UUID
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[11:07] <masterpe> My ubuntu system try's to mount the fs before the nic/rbdmap service is up, becource I get an mount error and need to skip
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[11:21] <IvanJobs> I have a question, if I run " ceph-deploy install --release hammer ceph-node4", can I find ceph-disk command on node ceph-node4?
[11:21] <IvanJobs> I have tried this, but ceph-disk is not there, but ceph-node{1-3} I deployed before has this ceph-disk command, can anyone tell me why?
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[11:26] <masterpe> after commentout in /etc/init/rbdmap.conf the lint " and remote-filesystems)" on start on\
[11:26] <masterpe> it has been fixed
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[11:44] <oms101> hi all, am following the HEPIX conferance and saw the following very interesting slides: https://umich.app.box.com/s/f8ftr82smlbuf5x8r256hay7660soafk is a really good overview of ceph, and https://indico.cern.ch/event/466991/contributions/2136880/attachments/1259352/1860646/jrha-hepix-2016-why-so-sirius.pdf about STFC's useage of ceph, and the interestign usage of ceph in USA research project: https://indico.cern.ch/
[11:44] <oms101> event/466991/contributions/1143627/
[11:45] <Walex> oms101: HEPiX is usually quite interesting, thanks for the pointers
[11:46] <oms101> np
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[12:08] <sep> masterpe, i'd image that was _netdev in fstab was suposed to fix ?
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[12:24] <masterpe> I had _netdev is fstab but still the startup squinse was not correct. The service rbdmap got started on the end
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[13:30] <Be-El> what is a good rule of thumb for the space needed by ceph mons?
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[13:31] <Jeeves_> root@node01:/var/lib/ceph# du -chs mon/
[13:31] <Jeeves_> 434M mon/
[13:31] <Jeeves_> 434M total
[13:32] <via> yeah, my 3+ year old cluster has 55M mon directories
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[13:35] <Be-El> so using 10-20GB should but the servers on the safe side
[13:35] <Be-El> thx
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[14:12] <tonythomas> Hey, I am trying to setup a file system storage cluster using ceph, and came across your documentation at http://docs.ceph.com/docs/master/start/quick-start-preflight/ -- in the 3 tier storage node setup, I see a 4th one - the admin-node. So, should I have total 4 machines for the setup ?
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[14:15] <sep> tonythomas, the admin node, is the one you run ceph-deploy from, you could use your laptop as that if you so wanted.
[14:15] <tonythomas> sep: so, that needn't be online 24x7, once the storage is deployed ?
[14:15] <sep> tonythomas, but the data you generate on the admin node, will be tied to the cluster. so it's not good to loose those. so make sure you have backups etc of them
[14:15] <sep> correct.
[14:16] <sep> but needed if you want to do changes/maintainance using ceph-deploy in the future.
[14:16] <tonythomas> sep: okey - so that would mean like adding a new storage volume later ?
[14:17] <sep> forinstance. i do not use ceph-deploy so i do not know where it's usage ends in normal operations
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[14:18] <tonythomas> sep: okey. I will keep backups of whatever that shows up. Just to ask one more thing, the latest stable version == hammer, right ?
[14:19] <sep> http://docs.ceph.com/docs/master/releases/ infernalis is latest stable,
[14:19] <sep> but hammer is LTS
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[14:26] <tonythomas> sep: okey. I will go for hammer then !
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[14:54] <Mika_c> Hi all, I have a question about firefly. My cluster have 3Mons and 6 OSD servers. But CPU utilization very very high that using by OSD daemons on one OSD server. Almost %200~%400 .
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[14:56] <Mika_c> I found a post "syncfs causes high cpu load" http://tracker.ceph.com/issues/12405 then follow the post to change vfs_cache_pressure. But not working. Any ideas???
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[15:08] <davidb1> Hi everyone, it might be a stupid question but I do not get the difference between Noout and Nodown option; in any case it causes slow requests and in the end I/Owait on VMs; can you please describe those and how to properly reboot a cephnode without doing so much backfills.
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[15:25] <Gugge-47527> davidb1: set the osd's noout, stop the osd's
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[15:25] <Gugge-47527> should not cause any backfill
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[15:27] <davidb1> this one I get it thx
[15:28] <davidb1> but what are the usecases of nodown ?
[15:28] <davidb1> (and thx Gugge-47527 btw)
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[15:39] <Gugge-47527> davidb1: i have no idea when nodown is a good idea :)
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[16:01] <davidb1> anyone else ?
[16:02] <davidb1> trying to know how nodown could be usefull
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[17:29] <tonythomas> hello! I was trying to setup a FS storage cluster using ceph, and I could complete till the step where we have one monitor node, and two OSD's running with a 'HEALTH_OK'. I am confused with http://docs.ceph.com/docs/master/start/quick-ceph-deploy/#operating-your-cluster -- but it seems that ceph is operational ( even though I am not able to find where to
[17:29] <tonythomas> access the storage ). While creating the metadata-server, the docs say that it can run along the monitor in the monitor node itself. Should I go with that, or have a separate machine for MDS ?
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[17:38] <xcezzz> tonythomas: while it is better to have separate machines, and spread out your failure points??? for testing it doesn???t matter
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[17:39] <tonythomas> xcezzz: thanks for that one. I just executed the command to add it to my monitor though :]
[17:40] <xcezzz> tonythomas: well with ceph in production??? you are DEFINITELY going to want at least 3 mons
[17:41] <xcezzz> and you can then just migrate them off your ???now??? mds server
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[17:43] <xcezzz> no real experience with cephfs though so not sure if you can spread out MDS???s yet properly??? just rocking the rbds
[17:44] <tonythomas> xcezzz: I can add this 3 mons to the osd's, as given in the example ?
[17:44] <xcezzz> ummm???. yes??? you can honestly put them wherever you want
[17:44] <xcezzz> you just testing right?
[17:45] <tonythomas> xcezzz: well, it seems like I will end up testing ( not-inentional ), but I am here - http://docs.ceph.com/docs/master/cephfs/createfs/ -- and trying to setup the File system cluster
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[17:46] <xcezzz> i dunno what your enviro is??? but like a heavy rebalance will make the load on OSD nodes skyrocket??? which will affect any other services running on them too???. like mons falling behind or out of quorum more elections, etc???
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[17:51] <tonythomas> xcezzz: yeah :( can you tell me why my $ ceph osd lspools returns 0 data,1 metadata,2 rbd ? Is it like, there is no pool for my data ?
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[17:52] <tonythomas> okey. I got it, its serial number :\
[17:53] <xcezzz> cephfs relies on multiple pools to provide the cephfs interface
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[17:53] <xcezzz> the mds is what makes it seem like a FS???
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[18:01] <tonythomas> xcezzz: okey. looks like those were the default. Now I get this error on mounting ' sudo mount -t ceph 192.168.1.8:6789:/ /mnt/mycephfs
[18:01] <tonythomas> mount error 22 = Invalid argument'
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[18:28] <rkeene> :-(
[18:28] <rkeene> # rados rmpool metadata metadata --yes-i-really-really-mean-it
[18:28] <rkeene> pool metadata does not exist
[18:28] <rkeene> (rados lspools lists it, of course)
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[18:31] <lookcrabs> Can pgs being deep scrubbed satisfy read requests?
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[18:50] <xcezzz> lookcrabs: yes
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[18:52] <tonythomas> xcezzz: I tried passing the correct username and password while mounting the fs, but I get - mount error 5 = Input/output error
[18:53] <rkeene> How can I remove a pool that Ceph thinks is still being used ?
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[18:54] <xcezzz> tonythomas: username and password?
[18:54] <xcezzz> tonythomas: you mean name and secret?
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[18:55] <tonythomas> xcezzz: oops. sorry, yes
[18:55] <rkeene> # ceph osd pool delete data data --yes-i-really-really-mean-it
[18:55] <rkeene> Error EBUSY: pool 'data' is in use by CephFS
[18:55] <rkeene> How do I delete this pool ?
[18:56] <tonythomas> xcezzz: so, I gave that command from my admin machine, and the secret is the same as what was found in /etc/ceph/ceph.client.admin.keyring in my monitor machine
[18:56] <xcezzz> rkeene: the MDS is offline and down?
[18:57] <tonythomas> xcezzz: and I see a mon0 192.168.1.8:6789 session established in my admin dmesg though
[18:57] <rkeene> xcezzz, There are no ceph-mds processes running (because they are in a segfault loop)
[18:57] <rkeene> xcezzz, So since no ceph-mds's are running I can delete these pools and rm -rf the mds data
[18:58] <xcezzz> rkeene: are their active clients on any part of the ceph pools? meaning could you possibly cycle the mons?
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[18:59] <rkeene> I can definitely cycle the mons -- but would that help me delete a pool ?
[19:00] <rkeene> The pool "data" is damaged, I need to delete it -- no ceph-mds processes can work
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[19:01] <xcezzz> well cycling mons/osds sometimes get the cluster to rejigger itself when it comes to incomplete pgs, or ???still mounted??? rbd stuff??? i am not too familiar with cephfs but when we have had rbd???s think they are still mapped we were able to clear it up by cycling the mons and retrying it
[19:01] <rkeene> Just kill the ceph-mon process and restart it ?
[19:03] <rkeene> Okay, I restarted all the ceph-mon... that made no difference to anything
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[19:04] <rkeene> root@aurae-storage-1:~# ceph fs rm cephfs
[19:04] <rkeene> Error EINVAL: all MDS daemons must be inactive before removing filesystem
[19:04] <rkeene> root@aurae-storage-1:~# ceph osd pool delete data data --yes-i-really-really-mean-it
[19:04] <rkeene> Error EBUSY: pool 'data' is in use by CephFS
[19:04] <rkeene> And of course, since the "data" pool is damaged no ceph-mds's can run, so there are 0 working ceph-mdses
[19:05] <xcezzz> ceph daemon mds.x session ls
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[19:06] <rkeene> Hmm ?
[19:07] <rkeene> root@aurae-storage-1:~# ceph daemon mds.0 session ls
[19:07] <rkeene> admin_socket: exception getting command descriptions: [Errno 2] No such file or directory
[19:07] <rkeene> (Remember, there are no ceph-mds processes running or possible to run)
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[19:13] <rkeene> Ah ha, ceph mds fail worked
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[19:14] <rkeene> Thanks !
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[20:49] <lookcrabs> thanks xcezzz I thought so but I couldn't find any explicit documentation stating it.
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[20:50] <xcezzz> lookcrabs: if your looking for some tools to help with scrubs that are more manual/gentle then check out CERN???s ceph scripts
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[20:53] <lookcrabs> xcezzz: I have checked out Cerns scripts. They are great!
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[20:54] <xcezzz> indeed! that gentle pg split was a lifesaver
[20:54] <lookcrabs> I am actually having an issue with RadosGW just hanging more or less. It doesn't accept any new connections, it doesn't fail or die, doesn't log any failures. It continues to log some kind of multipart handling but that's it. It fails to respnd to curl etc. I opened up a ticket with redhat and they are (in my opinion) just jerking me around more or less
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[21:00] <Kvisle> lookcrabs: how's your cluster doing?
[21:00] <Kvisle> is it currently in HEALTH_OK?
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[21:02] <Kvisle> I've had apache run out of workers because radosgw have attempted to perform IO against pg's that needed recovery while norecover was set -- and those operations were blocked ... the second norecover was unset, things started working again
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[21:15] <lookcrabs> Kvisle: cluster is health_ok
[21:15] <lookcrabs> can write objects to the .rgw.buckets pool via rados.
[21:15] <lookcrabs> other gateway works
[21:15] <lookcrabs> using civetweb myself. Why Apache may I ask?
[21:16] <lookcrabs> Kvisle: ^
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[21:16] <Kvisle> lookcrabs: no clear reason ... I was following the appropriate installation docs at the time, and it does what I need
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[21:22] <lookcrabs> ah indeed. Do you have 100-continue working?
[21:22] <lookcrabs> I am just using civetweb mostly for the same reasons. It just seems simpler to set up overall
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[21:30] <axion_joey> Hey Everyone. First off I'm an idiot. I just set up a small ceph cluster using ceph-deploy. Then because I'm an idiot, I accidentally deleted the vm that was running ceph-deploy. Am I screwed. The cluster is working perfectly, but I'm worried that I've lost the ability to change or manage it.
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[21:31] <diq> you should only need the various keys, secrets, and ceph.conf. Those are probably on every node in your cluster
[21:31] <lookcrabs> ^
[21:31] <lookcrabs> you can probably copy out the monitor bootstrab key and the admin key from a monitor and then should be back to where you were
[21:32] <lookcrabs> really you just need the admin key and can grab the rest from auth I Think
[21:33] <lookcrabs> axion_joey: key should hopefully be in /etc/ceph on some other node. anywhere you pointed 'ceph-deploy admin ${node} '
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[21:34] <axion_joey> thanks guys
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[21:35] <axion_joey> in /etc/ceph on a monitoring node I have ceph.client.admin.keyring, ceph.conf, rbdmap and tmpci4phQ
[21:35] <axion_joey> is that enough
[21:35] <axion_joey> if not then I can blow everything out and start over before we put this in production.
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[21:40] <lookcrabs> ceph.client.admin.keyring is your keyring you need to run ceph auth commands.
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[21:40] <lookcrabs> copy that and the ceph.conf back to your admin node and from there you should be okay
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[21:41] <lookcrabs> ceph admin *
[21:41] <axion_joey> will do.
[21:41] <axion_joey> thanks so much
[21:41] <lookcrabs> np hope that helps please let us know if you need anything else ^_^
[21:42] <axion_joey> will do.
[21:42] <axion_joey> besides making some really stupid mistakes, this has been really easy to deploy
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[22:10] <SDub> I have a question about using ceph with glance
[22:10] <SDub> I'm creating an image with glance, the size of the raw file is 8.3GB
[22:10] <SDub> I have 12.5GB available in my OSDs
[22:10] <SDub> I can watch the OSD fill up to beyond 8.3GB, well into 11GB+
[22:11] <SDub> why does it need more space than the actual file size
[22:11] <Kvisle> replication?
[22:11] <SDub> ooh.
[22:11] <SDub> that may be why.
[22:12] <SDub> is that a default enabled feature or is that something that would be set in the config?
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[22:14] <Kvisle> it's enabled by default, and if you don't want replication - ceph is probably not what you're looking for.
[22:15] <SDub> I'm running a staging version of openstack on a bunch of vagrant VMs, so I don't have a ton of space :) ceph is definitely what I want. You're right, looks like replication is enabled for my images pool, thanks Kvisle!
[22:16] <T1> I think you misunderstand how ceph works.. and why replication is important
[22:18] <Kvisle> well, it's different when it's for poc'ing ... but yeah; replication with a min_size of 2 for data integrity.
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[22:20] <SDub> ?
[22:20] <SDub> it's pretty obvious why replication is important, I'm not bashing it, or disabling it
[22:20] <SDub> I just forgot that ceph did that
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[22:23] <Kvisle> :)
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[22:39] <crodrigue> Greetings, everyone. I???m having issues getting the GPG key for the Debian ceph repository. Is this a known issue with a workaround?
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[22:50] <laevar> hi, after upgrading from 10.1.1 to 10.1.2 the monitors didn't restart and crash. I have only one monitor (on 10.1.1) left and i am not sure what to do now
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[23:19] <lookcrabs> laevar: I mean.. I guess you could revert to the previous version?
[23:19] <lookcrabs> honestly though it would be best to figure out why the monitors are not starting
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[23:20] <lookcrabs> laevar: I am still using hammer (sticking to lts releases) but what happens when you try to start a monitor?
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[23:22] <lookcrabs> another thing you could do is remove and re-add the bad monitors from the one remaining monitor? I think it would be best to try to get them back up prior to trying that as well though
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[23:31] <laevar> lookcrabs: yes i am reverting the version at the moment..
[23:32] <laevar> lookcrabs: i also tried to remove and add the monitor, but that fails too
[23:33] <laevar> lookcrabs: the crash log isnt helping me at all
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[23:36] <lookcrabs> what happens when you try to start one manually?
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[23:36] <lookcrabs> I would bump up verbosity and restart manually and see what happens
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[23:49] <laevar> lookcrabs: http://pastebin.com/VHtKkSEn
[23:49] <laevar> lookcrabs: i downgraded and is fine again. but it seems there is some upgrade-bug?
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[23:57] * ffilz (~ffilz@c-76-115-190-27.hsd1.or.comcast.net) Quit (Ping timeout: 480 seconds)
[23:58] * thomnico (~thomnico@12.237.105.2) Quit (Ping timeout: 480 seconds)
[23:58] * zwu (~root@58.135.81.96) Quit (Ping timeout: 480 seconds)
[23:58] * ffilz (~ffilz@c-76-115-190-27.hsd1.or.comcast.net) has joined #ceph
[23:58] * thomnico (~thomnico@2a01:e35:8b41:128::10) has joined #ceph
[23:59] * joao|afk (~joao@8.184.114.89.rev.vodafone.pt) has joined #ceph

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