#ceph IRC Log

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IRC Log for 2011-12-09

Timestamps are in GMT/BST.

[0:09] <todin> joshd: the kernel is the same on all machines. but libapparmor1 is not installed on all.
[0:09] <todin> on the working ones libapparmor1 is installed
[0:11] <joshd> ah, it looks like libvirt is falling back to it's own internal thing when it can't find apparmor or selinux
[0:12] <todin> that's not nice,
[0:15] <joshd> yeah, that'll probably stop any operation on rbd images, since it's using file permissions
[0:16] <todin> how does this nbd or sheepdog handel?
[0:16] <joshd> probably fails the same way
[0:59] <ajm> joshd: opened a bug: http://tracker.newdream.net/issues/1806
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[1:14] <ajm> adam # ceph mds getmap -o map
[1:14] <ajm> adam # ls -l map
[1:14] <ajm> ls: cannot access map: No such file or directory
[1:14] <ajm> it can't write due to permissions
[1:14] <ajm> but I guess it should say something?
[1:17] <joshd> ajm: the error's going where the logs go - if you pass --log-to-stderr you should see it
[1:18] <ajm> quite!
[1:18] <ajm> is there no mdsmaptool ?
[1:21] <joshd> I'm not sure how to read mdsmaps - gregaf would know
[1:21] <gregaf> erm, actually we don't have a good dump tool for that :(
[1:22] <ajm> i see one sage used a while ago here
[1:22] <ajm> http://tracker.newdream.net/issues/1001
[1:22] <ajm> but nothing in git
[1:23] <gregaf> oh, huh
[1:23] <ajm> i wonder if he threw it together then didn't commit it
[1:23] <ajm> trying to figure why these mds'es are broken :/
[1:23] <gregaf> probably
[1:23] <gregaf> grrr
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[1:37] <nwatkins> gregaf: got that fd leak patch deployed. it's lookin good so far!
[1:37] <gregaf> glad to hear it
[1:38] <nwatkins> gregaf: me too...no more restarts. thanks a lot
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[1:43] <Tv> for field in performance_review.keys(): performance_review[field] = 3
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[7:48] <z701> buurp
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[18:20] <wonko_be> hi, just a note, do you guys know that your wiki is being filled with spam?
[18:24] <Tv> wonko_be: yes. grumble grumble.
[18:24] <Tv> wonko_be: that's one of the reasons i'm pushing toward http://ceph.newdream.net/docs/latest/
[18:25] <guido> I'm getting the feeling the projectdoesn't even care about their wiki anymore much
[18:25] <Tv> guido: the spam protection features of the wiki software aren't worth much, it takes a lot of effort to keep it free of spam
[18:26] <Tv> guido: and we're all kind of emacs/vi people, not so happy typing into a textarea in a browser
[18:31] <Tv> also a lot of the wiki content was severely out of date, so we're using this as an opportunity to put some TLC into the documentation
[18:31] <Tv> this is the current poster boy of the new docs: http://ceph.newdream.net/docs/latest/ops/install/mkcephfs/
[18:32] <Tv> but Getting Started and Architecture also have some good stuff, just more general level
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[18:54] <todin> Tv: is there anywhere an explaination of the pg dump output?
[18:54] <Tv> todin: i don't think there's a clear writeup anywhere, it's on my list to get around to :(
[18:55] <Tv> todin: is there some particular aspect i can try to explain?
[19:00] * joshd (~joshd@aon.hq.newdream.net) has joined #ceph
[19:01] <todin> Tv: some of the colums are clear some are not
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[19:01] <todin> where is the diffrents between reported and up?
[19:03] <Tv> todin: ahh that goes pretty deep into how the osd peering works
[19:04] <Tv> http://ceph.newdream.net/docs/latest/dev/peering/ is the beginning of a document describing those internals
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[19:06] <Tv> todin: i think the length of the state column makes the output misleading, be careful in following the columns..
[19:06] <Tv> todin: i think reported is a 4'5 style value, up is a [0] style value
[19:07] <Tv> 4'5 is epoch'version, [0] is list of osds
[19:10] <Tv> yeah it's just \t's not doing widths >8
[19:11] <Tv> "ceph pg dump --format=json" gets around the formatting
[19:11] <Tv> and confirms what i said
[19:58] <guido> Tv: Well, it's certainly very nice to see the documentation shaping up
[20:00] <guido> btw, does anybody know what the current status is with regard to rbd storage pools in libvirt?
[20:01] <Tv> joshd: ^
[20:01] <joshd> guido: not implemented yet
[20:02] <joshd> guido: but you don't need a storage pool to use rbd images with libvirt
[20:16] <todin> joshd: that's right, but it would be nice to create and snaphot images via libvirt
[20:17] <joshd> yeah, the feature's in the tracker, we just haven't gotten to it yet
[20:18] <joshd> http://tracker.newdream.net/issues/1422
[20:18] <todin> joshd: is it easy? I am still looking for easy stuff i could contribute
[20:22] <joshd> now that librbd exists it's a lot easier - and the rbd tool can handle the kernel mapping/unmapping
[20:23] <todin> with librbd you mean the qemu rbd block driver?
[20:24] <joshd> I mean librbd.so - it's the library that provides access to rbd images
[20:24] <joshd> it's used by the rbd tool and the qemu rbd driver
[20:25] <joshd> the python api is documented http://ceph.newdream.net/docs/latest/api/librbdpy/
[20:34] <guido> joshd: What about the C API?
[20:37] <joshd> not really documented yet, but you can get an idea of usage from the tests (https://github.com/NewDreamNetwork/ceph/blob/master/src/test/test_librbd.cc) or the python bindings (https://github.com/NewDreamNetwork/ceph/blob/master/src/pybind/rbd.py)
[20:42] <joshd> if people are interested, I could spend some time documenting it (and the librados C api) next week
[20:43] <todin> joshd: that would be nice
[20:44] <guido> Well, I would be interested
[20:46] <guido> About the documentation, the wiki seems to be mostly abandoned, but the new documentation pages under http://ceph.newdream.net/docs/latest/ are not linked to from anywhere, as far as I can see
[20:48] <joshd> feel free to add links (and doc patches) - where the docs duplicate the wiki, we've tried to replace that with links to the docs
[20:48] <guido> How about just putting a big banner on the wiki's frontpage saying something like "This wiki is being deprecated, click here to go to the new documentation pages (wip)"
[20:51] <Tv> guido: i've done that on individual pages, where the content has moved
[20:51] <Tv> guido: but for a lot of things, the wiki is still the best source
[20:51] <Tv> guido: so.. soon
[20:51] <Tv> the current main website is a mess
[20:52] <Tv> there's a bigger project to revamp it fully
[20:52] <Tv> and us coders are waiting to see if something comes out of that, or not ;)
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