On Thu, 16 May 2002 21:14:34 -0400, "Skip Gaede" <[EMAIL PROTECTED]> wrote:
> Brian,
>
> You clearly know your SNMP stuff!
Oh, no...I'm just a wanderer bangin' on things until they work. I've been exposed
to SNMP several times and it just never really sank in.
> In going through the EXAMPLE.conf file
> supplied with 4.2.5 ucd-snmp from sourceforge, it looks like we might be
> able to collect the raw data needed from the clients by capturing the data in
> three tables maintained in the /proc filesystem
>
> /proc/stat
> /proc/meminfo
> /proc/net/dev
>
> I added the following three lines to your config file:
>
> exec .1.3.6.1.4.1.2021.50 meminfo /bin/sh /tmp/meminfo.sh
> exec .1.3.6.1.4.1.2021.51 kernelstats /bin/sh /tmp/kernelstats.sh
> exec .1.3.6.1.4.1.2021.52 netinfo /bin/sh /tmp/netinfo.sh
>
> Each of the scripts "cats" the corresponding file in the /proc filesystem,
> and the data can be obtained with the command
>
> snmpwalk -v 1 ws004 public .1.3.6.1.4.1.2021.50
>
> [skip@sgaede skip]$ snmpwalk -v 1 localhost private .1.3.6.1.4.1.2021.50
> enterprises.2021.50.1.1 = 1
> enterprises.2021.50.2.1 = "meminfo"
> enterprises.2021.50.3.1 = "/bin/sh /tmp/meminfo.sh"
> enterprises.2021.50.100.1 = 0
> enterprises.2021.50.101.1 = " total: used: free: shared: \
> buffers: cached:"
> enterprises.2021.50.101.2 = "Mem: 261877760 257609728 4268032 0 \
> 16596992 67489792"
> enterprises.2021.50.101.3 = "Swap: 254943232 246378496 8564736"
> enterprises.2021.50.101.4 = "MemTotal: 255740 kB"
> enterprises.2021.50.101.5 = "MemFree: 4168 kB"
> enterprises.2021.50.101.6 = "MemShared: 0 kB"
> enterprises.2021.50.101.7 = "Buffers: 16208 kB"
> enterprises.2021.50.101.8 = "Cached: 61908 kB"
> enterprises.2021.50.101.9 = "SwapCached: 4000 kB"
> enterprises.2021.50.101.10 = "Active: 45356 kB"
> enterprises.2021.50.101.11 = "Inactive: 184456 kB"
> enterprises.2021.50.101.12 = "HighTotal: 0 kB"
> enterprises.2021.50.101.13 = "HighFree: 0 kB"
> enterprises.2021.50.101.14 = "LowTotal: 255740 kB"
> enterprises.2021.50.101.15 = "LowFree: 4168 kB"
> enterprises.2021.50.101.16 = "SwapTotal: 248968 kB"
> enterprises.2021.50.101.17 = "SwapFree: 8364 kB"
> enterprises.2021.50.101.18 = "NrSwapPages: 2091 pages"
> enterprises.2021.50.102.1 = 0
>
>
> I did the work on the server, and am now compiling the code for the clients.
> What do you think: is this sufficient or should we create a custom MIB?
Actually, there are two issues here:
1. All this information is a part of the MIB that comes with Redhat. There's even
a means to enumerate the information- one entry is a process number, and there's a
corresponding entry for that process's shared memory, system memory and all sorts of
things I didn't think I'd ever use, anywhere...but here. I'm a big fan of relying on
previous work where it exists, and where it allows us the answers we need. It's all
there...let's not burden the system being monitored with any more computation than it
needs.
2. SNMP by nature, is very low level. They don't send ASCII strings unless it's
the only way. You generally get numbers, not pretty-printed names identifying them,
and making the job of a remote computer making sense of it all that much easier. and
if/when the results of cat'ing these structures changes, we won't have to publish
duplicate-looking releases, ya know?
I'd say (for systems using Redhat and/or Mandrake) we stick to the original
standard...the last thing we need is YET ANOTHER confusing standard to adhere to, and
to wonder which is in use.
Take another look at the results of the snmpwalk generated from my configfile.
There are **boatloads** of information there, all laid out so that perl programmers
and such would be able to loop through'em and get all the details in as few transfers
as possible. Look close though- there's a LOT of data there, when you walk it all.
------------------------------------------------------------------------
Brian Fahrländer Linux Zealot, Conservative, and Technomad
Evansville, IN My Voyage: http://www.CounterMoon.com
ICQ 5119262
AOL: WheelDweller
Yahoo: WheelDweller Me: http://www.kamakiriad.com/aboutme.html
------------------------------------------------------------------------
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