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[04:08] <jtv> Hi bigjools — I have some documentation updates ready for the multiple networks per cluster, but what I'm still missing is a clear designing-your-network document. |
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[04:08] <bigjools> jtv: g'day |
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[04:08] <bigjools> jtv: I think some examples would be good but we don't want to be prescriptive do we? |
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[04:09] <bigjools> it's not like serious users will take notice anyway :) |
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[04:10] <jtv> I'm thinking not so much of an if-all-else-fails-rtfm thing, or a "how to unpack your ipod: 1. do not unpack under water or near impending nuclear explosions" |
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[04:11] <jtv> More "the things you'll want to know before you start with this" |
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[04:11] <bigjools> jtv: sounds good |
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[04:11] <jtv> Something that sets the expectations for what you can do with maas, and what you're going to need. |
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[04:12] <jtv> If you think it's useful for me to write up a first stab at such a document, I can put my current branch up for review first. |
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[04:14] <jtv> Ah. Last night I put up a small branch to remove NodeGroup.get_any_interface(), which thank Kibo we no longer needed. Raphaël not only approved it (his review notes being just "Scary!") but landed it before I changed my mind. :-) |
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[04:22] <bradm> has anyone found any useful docs on getting maas to talk ipmi to hp proliant kit? its not obvious to me after a reasonable search, and if someone could shortcut figuring it out, it'd be great :) |
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[04:23] <jtv> I think that's the same ilo as the microservers, right bigjools? |
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[04:24] <bradm> I've mostly got ilo3 and ilo4, the kit is hp proliant dl380 g6/7/8s, or there abouts |
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[04:24] <jtv> Some of us have that — g7 I think. So it shouldn't be hard to get that documented. |
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[04:25] <jtv> With luck it's merely one of those situations where "yay it works" gives people the signal that they're done, and it's just a matter of getting them to write it down. |
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[04:26] <jtv> I do recall that there were some IPMI things it just won't do — such as a serial console. |
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[04:26] <bradm> yeah, thats fine, I think all I care about is the ability to power on / off the servers |
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[04:26] <bradm> the ilos work well for just about everything else |
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[04:26] <jtv> Hmm that ought to be standard fare... |
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[04:26] <bradm> well, they can power on and off the servers too, but I want MaaS to do it for me |
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[04:26] <bradm> its entirely possible there's something wrong with my ipmi setup, too |
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[04:27] <jtv> Yes, and that should work, right? |
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[04:27] <bradm> doesn't seem to |
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[04:27] <bradm> I've been having to manually power cycle things, over the ilo |
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[04:27] <jtv> :/ |
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[04:27] <jtv> Have you tried it from the command line using ipmitool? |
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[04:27] <bradm> I've got 25 nodes in this maas cluster, it'll be more soon |
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[04:27] <jtv> Because the MAAS configuration should be very similar to that. |
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[04:27] <bradm> hm, no, I haven't |
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[04:28] <bradm> I wasn't even sure if that should work without config on the ilo side of things |
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[04:28] <jtv> MAAS needs to know the ilo's address, and IPMI login credentials. |
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[04:28] <bigjools> bradm: how do you have it set up right now? |
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[04:28] <bigjools> is it configured in maas and just doesn't work? |
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[04:28] <bigjools> or something else? |
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[04:29] <bradm> bigjools: in maas I have a power type of ipmi, driver auto detect, with the user and password |
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[04:29] <bigjools> bradm: can you see the power_on task appearing in the celery log? |
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[04:30] <bradm> bigjools: yes |
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[04:30] <bigjools> bradm: and it just fails then? |
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[04:30] <bigjools> as in doesn't turn it on? |
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[04:30] <bradm> bigjools: yeah |
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[04:31] <bigjools> bradm: did you try changing the driver type? |
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[04:32] <bigjools> bradm: you need 2.0 for proliant |
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[04:32] <bigjools> https://bugs.launchpad.net/maas/+bug/1086162 |
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[04:32] <bradm> bigjools: not yet, I had a quick search and really didn't find much to explain how it should be done |
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[04:32] <ubot5> Ubuntu bug 1086162 in MAAS "IPMI based power management default to IPMI 1.5 based authentication" [High,Triaged] |
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[04:32] <bigjools> bradm: just edit the node |
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[04:32] <bradm> bigjools: yeah, but more as in what the next steps are, I can see how to change the driver :) |
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[04:32] <bradm> bigjools: is there some way to change the default for the maas server? |
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[04:32] <bigjools> well just try that |
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[04:33] <bigjools> not really |
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[04:33] <bigjools> the idea is that when the hardware enlists, its power type is set |
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[04:33] <bigjools> there is no sane default |
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[04:33] <bigjools> did you manually enlist these nodes or do a boot-enlist? |
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[04:33] <bradm> right, I thought there just might be a config setting |
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[04:33] <bradm> so that you could override what the default was |
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[04:33] <bigjools> there used to be a config but I ripped it out :) |
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[04:33] <bradm> it was a boot-enlist |
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[04:34] <bigjools> makes no sense in non-heterogeneous environs |
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[04:34] <bradm> so us heterogeneous folk have to suffer for it? :) |
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[04:34] <bigjools> ok so the bug is that the power type is not detected in the enlistment code |
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[04:35] <bigjools> bradm: does this help https://bugs.launchpad.net/maas/+bug/1086162/comments/6 |
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[04:35] <ubot5> Ubuntu bug 1086162 in MAAS "IPMI based power management default to IPMI 1.5 based authentication" [High,Triaged] |
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[04:36] <bradm> bigjools: it, uh, could? although I'm not exactly sure why you need something installed on the server if I'm talking ipmi to the ilo |
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[04:37] <bigjools> that's just a quick hack to make it use 2.0 on the cluster controller |
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[04:37] <bradm> oh, so it should be on the maas server? I don't even have that directory |
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[04:37] <bigjools> you can also use maas shell to mass-edit the Node rows in the DB |
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[04:38] <bigjools> bradm: oh ignore me |
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[04:38] <bigjools> we don't use freeipmi any more |
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[04:39] <bradm> whew :) |
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[04:39] <bradm> ok, so I'll try setting the IPMI version to 2.0 for my next install, shouldn't be too long |
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[04:39] <bigjools> bradm: just edit one node to use LAN_2_0 and see if it works |
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[04:40] <bradm> a default setting for the ipmi type would be mighty useful |
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[04:40] <bradm> any time you have to set something manually is an opportunity for error |
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[04:43] <bradm> oh, bah, the only free node I have doesn't have network for whatever reason, but it does have ilo |
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[04:54] <bigjools> bradm: well the point is that the enlistment should work in the first place. Defaults are workarounds. |
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[04:54] <bigjools> jtv: hahaha. The iLO web interface for the N40L has a "use this tagged vlan" setting |
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[04:55] <bradm> bigjools: right, thats true. but bugs do exist in software, and its nice to be able to tweak things to work around them. |
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[04:55] <bigjools> bradm: there's nothing stopping you from tweaking the setting |
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[04:55] <bradm> bigjools: and having to do it to every single server, and then remembering to do it every time I add a new one.. |
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[04:58] <bradm> any sysadmin who's told they have to tweak a setting for every single server will say "Why isn't the default configurable?" |
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[04:59] * jtv flashes bigjools an angry look |
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[04:59] * bigjools bats eyelids at jtv |
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[05:00] <bigjools> bradm: even if you had a default power type, you still need to set the credentials |
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[05:00] <bigjools> it makes no sense for this at all |
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[05:32] <bradm> bigjools: hmm, I'm not sure I agree - its another thing that whoever sets it up will have to remember to reset - its obvious you have to do IP, username and password, but I could easily see the fact that it needs to be overridden overlooked by someone. |
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[05:32] <bradm> bigjools: but its not a huge deal |
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[05:32] <bigjools> bradm: you have to remember to set the credentials anyway |
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[05:32] <bigjools> if you['re doing it manually |
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[05:33] <bigjools> you're just asking for a workaround for a weird bug here, I'd rather fix the bug! |
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[05:33] <bigjools> if we set defaults for power types then it makes it harder to flag to the user that the power was not configured yet |
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[05:36] <bradm> bigjools: mmm, yeah, I guess. I just find it frustrating when software makes me have to set values on things that could have a default. I'm not sure how often someone would need to change this |
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[05:37] <bigjools> bradm: exactly, it needs setting once, correctly, when enlisting. you're having to set it because of a bug, not because it has no default |
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[05:39] <bradm> bigjools: I have to wait for someone in the UK to wake up and start work before I can really test this, I've got openstack deployed to this maas server right now |
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[05:39] <bigjools> bradm: ok let me know when you can |
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[05:39] <bigjools> bradm: I think roaksoax will be interested in this, I though ipmi detection worked better on proliant |
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[05:40] <bigjools> thought* |
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[05:43] <bradm> bigjools: I wouldn't rule out some kind of misconfiguration here, I don't really know what I'm doing and am randomly clicking buttons. Plus I was handed over an existing setup :) |
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[05:43] <bigjools> bradm: heh ok |
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[05:43] <bradm> this ipmi type stuff isn't really documented anywhere obvious that I've seen |
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[05:49] <bradm> I'd kind of expected at least a mention of it in http://maas.ubuntu.com/docs/nodes.html, maybe |
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[05:57] <bigjools> bradm: ok |
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[10:17] <melmoth> hola. I have been asked how to tell maas to use a specific preseed file for a given node |
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[10:17] <melmoth> according to https://maas.ubuntu.com/docs/development/preseeds.html#user-provided-preseeds it s possible |
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[10:17] <melmoth> but i dont undertsand how to get a list of valid value for all the "macro" defined {prefix}_{node_architecture}_{node_subarchitecture}_{release}_{node_name} |
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[11:09] <gmb> rvba, allenap, jtv: If you have a second, https://code.launchpad.net/~gmb/maas/bug-1274871/+merge/204195 is up for review. |
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[11:21] <rvba> gmb: lgtm |
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[11:22] <gmb> Ta |
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[11:32] <allenap> melmoth: I’m looking into that... |
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[11:39] <allenap> melmoth: So, if you look in /etc/maas/preseeds there are several files. To override curtin_userdata for an amd64 node named fred on which you want to run precises, for example, you’d create a file called curtin_userdata_amd64_generic_precise_fred. |
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[11:39] <allenap> melmoth: It’s a bit clumsy, I grant you, but perhaps you could explain what you need to do and I can see if there’s another way to do it? |
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[11:56] <melmoth> allenap, a customer (i m doing support) wants to generate per host preseed file, and i need to tell him how to do that |
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[11:57] <melmoth> so i have been given the url with the user-provider preseed, and i m just wondering what he should put in place of the {settings} to get a preseed that match a given node |
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[11:58] <allenap> melmoth: Okay. Generally, our advice would be: if the machine boots without customising the preseed, wait until it’s up then use, say, Juju or another tool to customise it at that point. |
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[11:59] <melmoth> what he wants is to install stuff on a given disk , so it needs to change that in the preseed |
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[11:59] <allenap> melmoth: Also, the templates are Tempita templates, so you can use any construct that they support, including embedding arbitrary Python. http://pythonpaste.org/tempita/ |
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[12:02] <allenap> melmoth: In other words, you could customise an existing preseed and get it to lookup rules in a separate file according to node name. The node object is passed into the template, so you can use node.name, iirc. |
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[13:39] <gmb> allenap, rvba, jtv: Another wee branch for you to give some love to: https://code.launchpad.net/~gmb/maas/bug-1274912/+merge/204234 |
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[13:40] <jtv> gmb: I'll take it. |
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[13:40] <gmb> Thankee |
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[13:41] <jtv> gmb: kindly COMMENT this kind of magic! In fact I would say this kind of magic is far too vague. Future generations will scratch their heads and be afraid to change the logic. |
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[13:42] <jtv> Can't get_effective_power_type() just return None for "none" or something? |
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[13:42] <gmb> jtv: Sure; I just did the same thing as start_power_nodes does because I was being lazy. |
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[13:42] <jtv> !? |
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[13:42] <gmb> I'll go fix it the *right way* :) |
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[13:43] <gmb> jtv: Seriously, go look :) |
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[13:43] <jtv> Suppressing a wildly generic error from a function somewhere else that might, now or in the future, raise it for unrelated reasons... <shudder> |
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[13:43] * jtv goes look |
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[13:43] <jtv> start_power_nodes..? |
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[13:43] <gmb> er |
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[13:43] <jtv> Who is start_power_nodes? |
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[13:43] <gmb> start_nodes() |
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[13:43] <gmb> Sorry. |
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[13:44] <gmb> power mad. |
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[13:44] <jtv> Let's try to keep the golden middle between power mad and power hungry. |
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[13:45] <jtv> Argh. So... repeating the same nonobvious try/except around the same function in multiple places... If only we had a mechanism for writing code just once and then invoking it from multiple places! |
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[13:46] <gmb> jtv: So, I'm guessing this raising of a ValueError (which is, as you say, weirdlybollocks) is to do with this: |
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[13:46] <gmb> 458 # For strings, Django insists on abusing the empty string ("blank") |
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[13:46] <gmb> 459 # to mean "none." |
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[13:46] <gmb> 460 power_type = CharField( |
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[13:46] <gmb> 461 max_length=10, choices=POWER_TYPE_CHOICES, null=False, blank=True, |
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[13:46] <gmb> 462 default='') |
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[13:46] <gmb> So basically you're not allowed to have no power type |
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[13:47] <jtv> Might be, yes. Django hasn't really embraced the null. |
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[13:47] <jtv> IIRC null=False means "do not go to the extreme measure of representing a null value as a null in the database." |
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[13:47] <rvba> Yes, that's what it means. |
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[13:48] <gmb> Yes. |
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[13:48] <jtv> Whereas blank=True means "this field may be left null, but we may store it as an empty string." |
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[13:48] * jtv giggles insanely |
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[13:48] <gmb> You're not allowed a power type, unless we actually want to use the power type you don't have, in which case we don't worry about the fact that you don't have one. |
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[13:48] <jtv> So we may have an "if power_type is None" somewhere that should be an "if power_type == ''" |
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[13:48] <gmb> s/not allowed a/not allowed not to have a/ |
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[13:49] <jtv> For a moment you sounded like my government. |
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[13:49] <gmb> jtv: No, I don't think so, but I'll check. |
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[13:50] <gmb> jtv: However, we treat '' as the node saying "I don't know what power type I have" |
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[13:52] <jtv> Ahhhh, get_effective_power_type deliberately raises that ValueError, but documents it as "an error." |
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[13:53] <jtv> One approach that's easy in Python and works well for these situations is to create an ad-hoc exception class, and document the function as raising that. |
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[13:58] <gmb> jtv: Right, I'll do that. Makes sense. |
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[14:58] <allenap> $Obligatory_rant_about_Django |
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