| --- | Log | opened Mon Oct 04 00:00:27 2010 |
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| 10:40 | <icenine457> | hey all, is there a reliable, scriptable (shell) means of obtaining the hostname/ip of a virtual guest using xen tools? |
| 10:42 | <deshantm> | icenine457: a tricky problem, i think |
| 10:42 | <icenine457> | tell me about it - we're looking to do it for EVERY virtualization package to integrate with our product |
| 10:42 | <deshantm> | I would think you could set things up to support it |
| 10:43 | <deshantm> | your product is outside of the system then i assume |
| 10:43 | <icenine457> | yep |
| 10:43 | <deshantm> | like you can modify things? |
| 10:43 | <icenine457> | we're using NRPE to get information about systems |
| 10:43 | <deshantm> | NRPE? |
| 10:43 | <icenine457> | so we run shell scripts on the host to obtain info |
| 10:44 | <icenine457> | its like a rootkit :P it gets in and runs shell scripts for you, sort of like puppet or cfengine i guess, but more focused on gathering information |
| 10:44 | <icenine457> | so basically all i can use is shell tools to get this dataa |
| 10:44 | <deshantm> | and only on the host/dom0 system? |
| 10:45 | <icenine457> | well if we discover that guest belongs to a host, as long as we can determine the hostname of the host, thatd be fine too |
| 10:45 | <icenine457> | we're trying to establish a heirarchal relationship between the two (im a host that has these ips/hostnames as guests) |
| 10:45 | <deshantm> | I've heard people use ARP tables to get the IPs |
| 10:46 | <deshantm> | since you can get the MAC usually |
| 10:51 | <icenine457> | the problem i think may be that they may not be on the same physical network even - a lot of our systems use dedicated physical connections |
| 10:51 | <icenine457> | i dont think i can rely on that unfortunately |
| 10:53 | <deshantm> | icenine457: from the host you should have access to spy on enough traffic to figure out the hosts |
| 10:53 | <deshantm> | i don't know as there are any implemented network introspection techniques |
| 10:54 | <icenine457> | ill get access to a machine and start playing with it |
| 10:54 | <icenine457> | but at least i can tell my boss itll be difficult now :) thanks |
| 10:54 | <deshantm> | probably wouldn't hurt to post to xen-devel |
| 10:56 | <icenine457> | http://forums.novell.com/novell-product-support-forums/suse-linux-enterprise-server-sles/sles-virtualization/410368-determine-physical-host-xen-virtual-guest-post1978816.html |
| 10:57 | <icenine457> | looks like i could 1) find out if we have VMs, 2) tell the host vm to drop off its hostname in the guest VMs fs, 3) check if the file we expect to contain the host vm is there |
| 10:57 | <icenine457> | at that point ive established a relationship between the systems i think |
| 10:58 | <icenine457> | grr but thats only paravirtualized guests |
| 10:58 | <deshantm> | yeah, i was just going to mention that |
| 10:59 | <deshantm> | if you are able to run something on the guest, you can easily get its IP and hostname |
| 10:59 | <icenine457> | but i wouldnt know that its a guest yet :P |
| 10:59 | <icenine457> | chicken/egg situation |
| 11:03 | <deshantm> | but on the host you can get a local console |
| 11:04 | <icenine457> | so something like an expect script to obtain the info maybe? |
| 11:06 | <deshantm> | yeah, i just don't know how reliable it would be with HVM guest supporting it |
| 11:06 | <deshantm> | are you able to put stuff in the HVM guests ahead of time |
| 11:06 | <deshantm> | they can support a console |
| 11:06 | <icenine457> | im going to say its not possible without considerable access to the machine, which we generally dont have |
| 11:07 | <icenine457> | we can i think; if thats the case ill just go with libguestfs |
| 11:07 | <icenine457> | then i can just `cat /etc/hostname` or whatever on the guests of a given host |
| 11:07 | <deshantm> | I think we limited access, and if you can't put stuff in ahead of time, network tracing is probably your best best |
| 11:08 | <deshantm> | since the host still does own the network |
| 11:08 | <icenine457> | i appreciate the input, thanks deshantm :) |
| 11:08 | <deshantm> | icenine457: best of luck |
| 11:08 | <icenine457> | i think ill need it :| |
| 11:09 | <deshantm> | also, ##xen on freenode is a bit more active than this channel |
| 11:09 | <deshantm> | posting to xen-users or xen-devel may be of help at times too |
| 11:10 | <icenine457> | ill try that once i get access to a xen machine and fail at getting it to work :P |
| 11:10 | <icenine457> | notice how anticipatory i am of that scenario haha |
| 11:11 | <icenine457> | er, how anticipating i am of of* |
| 11:12 | <deshantm> | yeah, haha |
| 11:12 | <deshantm> | maybe your ideas will "just work" |
| 11:12 | <icenine457> | gotta hope for the best :) |
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| --- | Log | closed Tue Oct 05 00:00:31 2010 |
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