[Ganglia-developers] system UUID (dmidecode)
Hi! Regarding the identification of hosts based on motherboard UUID i
thought to post some info to spare developers of ganglia of some wasted
seconds :)
So : on rhel systems you must do :
yum install python-dmidecode (so gmond should have dependency on this
package that is found in distros repo)
and the small python script (taken from the example of developers of
python-demidecode) would be like this (removed all comments for space
reasons) :
import dmidecode
import sys, os
from pprint import pprint
def print_warnings():
Simple function, dumping out warnings with a prefix if warnings
are found and clearing warning buffer
warn = dmidecode.get_warnings()
if warn:
print ### WARNING: %s % warn
dmidecode.clear_warnings()
root_user = (os.getuid() == 0 and True or False)
if not root_user:
print NOT RUNNING AS ROOT
dmixml = dmidecode.dmidecodeXML()
dmixml.SetResultType(dmidecode.DMIXML_DOC)
xmldoc = dmixml.QuerySection('all')
dmixp = xmldoc.xpathNewContext()
data = dmixp.xpathEval('/dmidecode/SystemInfo/SystemUUID')
for d in data:
print %s % (d.get_content())
del dmixp
del xmldoc
HTH,
Adrian
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Re: [Ganglia-developers] system UUID (dmidecode)
Thanks for the suggestion, but dmidecode is not portable and is super
unreliable since it depends on upstream hardware vendors setting
reasonable values. Even running on a sample of 8-10 models of
motherboards all from the same vendor I get vastly different results
from dmidecode. I'd strongly discourage anybody from trying to integrate
it into other software for anything aside from general informational use.
-Dave
On 08/01/2013 01:50 AM, Adrian Sevcenco wrote:
Hi! Regarding the identification of hosts based on motherboard UUID i
thought to post some info to spare developers of ganglia of some wasted
seconds :)
So : on rhel systems you must do :
yum install python-dmidecode (so gmond should have dependency on this
package that is found in distros repo)
and the small python script (taken from the example of developers of
python-demidecode) would be like this (removed all comments for space
reasons) :
import dmidecode
import sys, os
from pprint import pprint
def print_warnings():
Simple function, dumping out warnings with a prefix if warnings
are found and clearing warning buffer
warn = dmidecode.get_warnings()
if warn:
print ### WARNING: %s % warn
dmidecode.clear_warnings()
root_user = (os.getuid() == 0 and True or False)
if not root_user:
print NOT RUNNING AS ROOT
dmixml = dmidecode.dmidecodeXML()
dmixml.SetResultType(dmidecode.DMIXML_DOC)
xmldoc = dmixml.QuerySection('all')
dmixp = xmldoc.xpathNewContext()
data = dmixp.xpathEval('/dmidecode/SystemInfo/SystemUUID')
for d in data:
print %s % (d.get_content())
del dmixp
del xmldoc
HTH,
Adrian
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Re: [Ganglia-developers] system UUID (dmidecode)
Adrian,
The Host sFlow agent exports UUIDs (and is compatible with Ganglia 3.2+).
http://blog.sflow.com/2011/07/ganglia-32-released.html
The daemon relies on command utilities invoked at startup to find the UUID (for
reasons of portability that Dave mentioned). You could take a look at the logic
in the Linux Host sFlow agent startup script and turn it into a Ganglia metric.
http://sourceforge.net/p/host-sflow/code/413/tree/trunk/src/Linux/scripts/hsflowd
Dave, the script uses the /usr/sbin/dmidecode command line tool. If it can't
find a valid UUID, it uses the UUID of the first local disk. What are the
issues with the vendor supplied UUIDs? Are they all zeros? Not set? Not unique?
Do you have a better way of retrieving persistent UUIDs to Linux systems?
Other operating systems provide different mechanism to read the UUID. You can
browse the Host sFlow source code for the different supported platforms.
Peter
On Aug 1, 2013, at 9:20 AM, Dave Rawks d...@pandora.com wrote:
Thanks for the suggestion, but dmidecode is not portable and is super
unreliable since it depends on upstream hardware vendors setting
reasonable values. Even running on a sample of 8-10 models of
motherboards all from the same vendor I get vastly different results
from dmidecode. I'd strongly discourage anybody from trying to integrate
it into other software for anything aside from general informational use.
-Dave
On 08/01/2013 01:50 AM, Adrian Sevcenco wrote:
Hi! Regarding the identification of hosts based on motherboard UUID i
thought to post some info to spare developers of ganglia of some wasted
seconds :)
So : on rhel systems you must do :
yum install python-dmidecode (so gmond should have dependency on this
package that is found in distros repo)
and the small python script (taken from the example of developers of
python-demidecode) would be like this (removed all comments for space
reasons) :
import dmidecode
import sys, os
from pprint import pprint
def print_warnings():
Simple function, dumping out warnings with a prefix if warnings
are found and clearing warning buffer
warn = dmidecode.get_warnings()
if warn:
print ### WARNING: %s % warn
dmidecode.clear_warnings()
root_user = (os.getuid() == 0 and True or False)
if not root_user:
print NOT RUNNING AS ROOT
dmixml = dmidecode.dmidecodeXML()
dmixml.SetResultType(dmidecode.DMIXML_DOC)
xmldoc = dmixml.QuerySection('all')
dmixp = xmldoc.xpathNewContext()
data = dmixp.xpathEval('/dmidecode/SystemInfo/SystemUUID')
for d in data:
print %s % (d.get_content())
del dmixp
del xmldoc
HTH,
Adrian
--
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caught up. So what steps can you take to put your SQL databases under
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Re: [Ganglia-developers] system UUID (dmidecode)
I think the more general point here (and has come up in other contexts
such as mobile phones) is that sometimes neither IP nor reverse DNS make
sense and people would like sending something else to be 'smoother' (as
opposed to hacky/spoofy).
My experience with vendor data hasn't given me warm and fuzzies either
(TO BE ENTERED BY O.E.M) but I could see something like UUID on
startup and 'custom bits on the motherboard' as reasonable -- if not
common -- use cases.
On 08/01/2013 12:20 PM, Dave Rawks wrote:
Thanks for the suggestion, but dmidecode is not portable and is super
unreliable since it depends on upstream hardware vendors setting
reasonable values. Even running on a sample of 8-10 models of
motherboards all from the same vendor I get vastly different results
from dmidecode. I'd strongly discourage anybody from trying to integrate
it into other software for anything aside from general informational use.
-Dave
On 08/01/2013 01:50 AM, Adrian Sevcenco wrote:
Hi! Regarding the identification of hosts based on motherboard UUID i
thought to post some info to spare developers of ganglia of some wasted
seconds :)
So : on rhel systems you must do :
yum install python-dmidecode (so gmond should have dependency on this
package that is found in distros repo)
and the small python script (taken from the example of developers of
python-demidecode) would be like this (removed all comments for space
reasons) :
import dmidecode
import sys, os
from pprint import pprint
def print_warnings():
Simple function, dumping out warnings with a prefix if warnings
are found and clearing warning buffer
warn = dmidecode.get_warnings()
if warn:
print ### WARNING: %s % warn
dmidecode.clear_warnings()
root_user = (os.getuid() == 0 and True or False)
if not root_user:
print NOT RUNNING AS ROOT
dmixml = dmidecode.dmidecodeXML()
dmixml.SetResultType(dmidecode.DMIXML_DOC)
xmldoc = dmixml.QuerySection('all')
dmixp = xmldoc.xpathNewContext()
data = dmixp.xpathEval('/dmidecode/SystemInfo/SystemUUID')
for d in data:
print %s % (d.get_content())
del dmixp
del xmldoc
HTH,
Adrian
--
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Re: [Ganglia-developers] system UUID (dmidecode)
I 100% agree that we should be able to use some sort of unique and persistent way to identify hosts, but I don't think that dmidecode is the way to do it. Generating a UUID once and then persisting it in a file would be my preference, but I think that more generally if we were to allow a user specified callback to provide the ID string would be the ideal situation and would be the most flexible. Some users may want to use the UUID from a disk or a filesystem label, others may find that their vendors provide the info in something usable via dmidecode, and yet others may just want to populate hostname as the identifier. Moving away from DNS would be a big win, IMHO, for a large percentage of users, but lets not adopt something that is equally troublesome for some other equally large percentage of users... -Dave On 08/01/2013 10:24 AM, Chris Burroughs wrote: I think the more general point here (and has come up in other contexts such as mobile phones) is that sometimes neither IP nor reverse DNS make sense and people would like sending something else to be 'smoother' (as opposed to hacky/spoofy). My experience with vendor data hasn't given me warm and fuzzies either (TO BE ENTERED BY O.E.M) but I could see something like UUID on startup and 'custom bits on the motherboard' as reasonable -- if not common -- use cases. On 08/01/2013 12:20 PM, Dave Rawks wrote: Thanks for the suggestion, but dmidecode is not portable and is super unreliable since it depends on upstream hardware vendors setting reasonable values. Even running on a sample of 8-10 models of motherboards all from the same vendor I get vastly different results from dmidecode. I'd strongly discourage anybody from trying to integrate it into other software for anything aside from general informational use. -Dave -- Get your SQL database under version control now! Version control is standard for application code, but databases havent caught up. So what steps can you take to put your SQL databases under version control? Why should you start doing it? Read more to find out. http://pubads.g.doubleclick.net/gampad/clk?id=49501711iu=/4140/ostg.clktrk ___ Ganglia-developers mailing list Ganglia-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ganglia-developers
Re: [Ganglia-developers] system UUID (dmidecode)
On 08/01/2013 10:23 AM, Peter Phaal wrote: Adrian, The Host sFlow agent exports UUIDs (and is compatible with Ganglia 3.2+). http://blog.sflow.com/2011/07/ganglia-32-released.html The daemon relies on command utilities invoked at startup to find the UUID (for reasons of portability that Dave mentioned). You could take a look at the logic in the Linux Host sFlow agent startup script and turn it into a Ganglia metric. http://sourceforge.net/p/host-sflow/code/413/tree/trunk/src/Linux/scripts/hsflowd Dave, the script uses the /usr/sbin/dmidecode command line tool. If it can't find a valid UUID, it uses the UUID of the first local disk. The UUID of the first disk is a completely different level of persistence than something less likely to be replaced during normal operation such as a CPU serial. But, realistically we aren't going to get something that is derived from hardware and meets everyone's definition of persistent and unique. What are the issues with the vendor supplied UUIDs? Are they all zeros? Not set? Not unique? All of the above. Do you have a better way of retrieving persistent UUIDs to Linux systems? Part of the problem is that people have differing levels of their need for persistence AND we need something agnostic of the underlying OS and host architecture. Not everyone running ganglia is running X86/AMD64 linux. Other operating systems provide different mechanism to read the UUID. You can browse the Host sFlow source code for the different supported platforms. Peter -Dave On Aug 1, 2013, at 9:20 AM, Dave Rawks d...@pandora.com mailto:d...@pandora.com wrote: Thanks for the suggestion, but dmidecode is not portable and is super unreliable since it depends on upstream hardware vendors setting reasonable values. Even running on a sample of 8-10 models of motherboards all from the same vendor I get vastly different results from dmidecode. I'd strongly discourage anybody from trying to integrate it into other software for anything aside from general informational use. -Dave -- Get your SQL database under version control now! Version control is standard for application code, but databases havent caught up. So what steps can you take to put your SQL databases under version control? Why should you start doing it? Read more to find out. http://pubads.g.doubleclick.net/gampad/clk?id=49501711iu=/4140/ostg.clktrk ___ Ganglia-developers mailing list Ganglia-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ganglia-developers
