Last year I’d documented monitoring the drive usage on my raspberry. This week after configuring my pi to boot from an external USB drive and mount three partitions with different filesystems in each, vfat, ext4fs, and exFat, I realized that the exFat volume isn’t showing up in the results of snmpwalk.
wim@WimPi4-Backup:~ $ snmpwalk -Os -c public -v 2c localhost iso.3.6.1.2.1.25.2
iso.3.6.1.2.1.25.2.2.0 = INTEGER: 7998784
iso.3.6.1.2.1.25.2.3.1.1.1 = INTEGER: 1
iso.3.6.1.2.1.25.2.3.1.1.3 = INTEGER: 3
iso.3.6.1.2.1.25.2.3.1.1.6 = INTEGER: 6
iso.3.6.1.2.1.25.2.3.1.1.7 = INTEGER: 7
iso.3.6.1.2.1.25.2.3.1.1.8 = INTEGER: 8
iso.3.6.1.2.1.25.2.3.1.1.10 = INTEGER: 10
iso.3.6.1.2.1.25.2.3.1.1.31 = INTEGER: 31
iso.3.6.1.2.1.25.2.3.1.1.36 = INTEGER: 36
iso.3.6.1.2.1.25.2.3.1.1.38 = INTEGER: 38
iso.3.6.1.2.1.25.2.3.1.1.39 = INTEGER: 39
iso.3.6.1.2.1.25.2.3.1.1.50 = INTEGER: 50
iso.3.6.1.2.1.25.2.3.1.1.52 = INTEGER: 52
iso.3.6.1.2.1.25.2.3.1.2.1 = OID: iso.3.6.1.2.1.25.2.1.2
iso.3.6.1.2.1.25.2.3.1.2.3 = OID: iso.3.6.1.2.1.25.2.1.3
iso.3.6.1.2.1.25.2.3.1.2.6 = OID: iso.3.6.1.2.1.25.2.1.1
iso.3.6.1.2.1.25.2.3.1.2.7 = OID: iso.3.6.1.2.1.25.2.1.1
iso.3.6.1.2.1.25.2.3.1.2.8 = OID: iso.3.6.1.2.1.25.2.1.1
iso.3.6.1.2.1.25.2.3.1.2.10 = OID: iso.3.6.1.2.1.25.2.1.3
iso.3.6.1.2.1.25.2.3.1.2.31 = OID: iso.3.6.1.2.1.25.2.1.4
iso.3.6.1.2.1.25.2.3.1.2.36 = OID: iso.3.6.1.2.1.25.2.1.4
iso.3.6.1.2.1.25.2.3.1.2.38 = OID: iso.3.6.1.2.1.25.2.1.4
iso.3.6.1.2.1.25.2.3.1.2.39 = OID: iso.3.6.1.2.1.25.2.1.4
iso.3.6.1.2.1.25.2.3.1.2.50 = OID: iso.3.6.1.2.1.25.2.1.4
iso.3.6.1.2.1.25.2.3.1.2.52 = OID: iso.3.6.1.2.1.25.2.1.4
iso.3.6.1.2.1.25.2.3.1.3.1 = STRING: "Physical memory"
iso.3.6.1.2.1.25.2.3.1.3.3 = STRING: "Virtual memory"
iso.3.6.1.2.1.25.2.3.1.3.6 = STRING: "Memory buffers"
iso.3.6.1.2.1.25.2.3.1.3.7 = STRING: "Cached memory"
iso.3.6.1.2.1.25.2.3.1.3.8 = STRING: "Shared memory"
iso.3.6.1.2.1.25.2.3.1.3.10 = STRING: "Swap space"
iso.3.6.1.2.1.25.2.3.1.3.31 = STRING: "/"
iso.3.6.1.2.1.25.2.3.1.3.36 = STRING: "/dev/shm"
iso.3.6.1.2.1.25.2.3.1.3.38 = STRING: "/run"
iso.3.6.1.2.1.25.2.3.1.3.39 = STRING: "/run/lock"
iso.3.6.1.2.1.25.2.3.1.3.50 = STRING: "/boot"
iso.3.6.1.2.1.25.2.3.1.3.52 = STRING: "/run/user/1000"
iso.3.6.1.2.1.25.2.3.1.4.1 = INTEGER: 1024
iso.3.6.1.2.1.25.2.3.1.4.3 = INTEGER: 1024
iso.3.6.1.2.1.25.2.3.1.4.6 = INTEGER: 1024
iso.3.6.1.2.1.25.2.3.1.4.7 = INTEGER: 1024
iso.3.6.1.2.1.25.2.3.1.4.8 = INTEGER: 1024
iso.3.6.1.2.1.25.2.3.1.4.10 = INTEGER: 1024
iso.3.6.1.2.1.25.2.3.1.4.31 = INTEGER: 4096
iso.3.6.1.2.1.25.2.3.1.4.36 = INTEGER: 4096
iso.3.6.1.2.1.25.2.3.1.4.38 = INTEGER: 4096
iso.3.6.1.2.1.25.2.3.1.4.39 = INTEGER: 4096
iso.3.6.1.2.1.25.2.3.1.4.50 = INTEGER: 2048
iso.3.6.1.2.1.25.2.3.1.4.52 = INTEGER: 4096
iso.3.6.1.2.1.25.2.3.1.5.1 = INTEGER: 7998784
iso.3.6.1.2.1.25.2.3.1.5.3 = INTEGER: 8101180
iso.3.6.1.2.1.25.2.3.1.5.6 = INTEGER: 7998784
iso.3.6.1.2.1.25.2.3.1.5.7 = INTEGER: 4050768
iso.3.6.1.2.1.25.2.3.1.5.8 = INTEGER: 1200
iso.3.6.1.2.1.25.2.3.1.5.10 = INTEGER: 102396
iso.3.6.1.2.1.25.2.3.1.5.31 = INTEGER: 129057828
iso.3.6.1.2.1.25.2.3.1.5.36 = INTEGER: 999848
iso.3.6.1.2.1.25.2.3.1.5.38 = INTEGER: 399940
iso.3.6.1.2.1.25.2.3.1.5.39 = INTEGER: 1280
iso.3.6.1.2.1.25.2.3.1.5.50 = INTEGER: 130554
iso.3.6.1.2.1.25.2.3.1.5.52 = INTEGER: 199969
iso.3.6.1.2.1.25.2.3.1.6.1 = INTEGER: 6165176
iso.3.6.1.2.1.25.2.3.1.6.3 = INTEGER: 6165176
iso.3.6.1.2.1.25.2.3.1.6.6 = INTEGER: 1999616
iso.3.6.1.2.1.25.2.3.1.6.7 = INTEGER: 4050768
iso.3.6.1.2.1.25.2.3.1.6.8 = INTEGER: 1200
iso.3.6.1.2.1.25.2.3.1.6.10 = INTEGER: 0
iso.3.6.1.2.1.25.2.3.1.6.31 = INTEGER: 2051665
iso.3.6.1.2.1.25.2.3.1.6.36 = INTEGER: 0
iso.3.6.1.2.1.25.2.3.1.6.38 = INTEGER: 299
iso.3.6.1.2.1.25.2.3.1.6.39 = INTEGER: 1
iso.3.6.1.2.1.25.2.3.1.6.50 = INTEGER: 15690
iso.3.6.1.2.1.25.2.3.1.6.52 = INTEGER: 0
wim@WimPi4-Backup:~ $ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/root 493G 7.9G 465G 2% /
devtmpfs 3.6G 0 3.6G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 1.6G 1.2M 1.6G 1% /run
tmpfs 5.0M 4.0K 5.0M 1% /run/lock
/dev/sda1 255M 31M 225M 13% /boot
/dev/sda3 6.8T 3.2T 3.7T 46% /media/WimPi4-Backup
tmpfs 782M 0 782M 0% /run/user/1000You can see the last digit of the OID jumps from 50 to 52, with 50 being “/boot” and 52 “/run/user/1000”. It would make sense that 51 would be “/media/WimPi4-Backup”. I don’t know if the problem is due to the size being 6.8T or the filesystem being exFat.
Looking into this made me want to document some of the other snmp tricks I find interesting.
Looking at just a single drive with grep, in this case the root partition.
wim@WimPi4-Backup:~ $ snmpwalk -Os -c public -v 2c localhost iso.3.6.1.2.1.25.2 | grep "\.31 ="
iso.3.6.1.2.1.25.2.3.1.1.31 = INTEGER: 31
iso.3.6.1.2.1.25.2.3.1.2.31 = OID: iso.3.6.1.2.1.25.2.1.4
iso.3.6.1.2.1.25.2.3.1.3.31 = STRING: "/"
iso.3.6.1.2.1.25.2.3.1.4.31 = INTEGER: 4096
iso.3.6.1.2.1.25.2.3.1.5.31 = INTEGER: 129057828
iso.3.6.1.2.1.25.2.3.1.6.31 = INTEGER: 2051665Translating between text and numeric versions of the snmp OIDs. I have seen demonstrations of this that go deeper than my system, and haven’t yet figured out how to get it to include the MIB details beyond the first level.
wim@WimPi4-Backup:~ $ snmptranslate 1.3.6.1.2.1.25.2
iso.3.6.1.2.1.25.2This page gave me some hints on CPU and memory monitoring.
wim@WimPi4-Backup:~ $ snmpwalk -Os -c public -v 2c localhost iso.3.6.1.4.1.2021.10
iso.3.6.1.4.1.2021.10.1.1.1 = INTEGER: 1
iso.3.6.1.4.1.2021.10.1.1.2 = INTEGER: 2
iso.3.6.1.4.1.2021.10.1.1.3 = INTEGER: 3
iso.3.6.1.4.1.2021.10.1.2.1 = STRING: "Load-1"
iso.3.6.1.4.1.2021.10.1.2.2 = STRING: "Load-5"
iso.3.6.1.4.1.2021.10.1.2.3 = STRING: "Load-15"
iso.3.6.1.4.1.2021.10.1.3.1 = STRING: "0.59"
iso.3.6.1.4.1.2021.10.1.3.2 = STRING: "0.32"
iso.3.6.1.4.1.2021.10.1.3.3 = STRING: "0.20"
iso.3.6.1.4.1.2021.10.1.4.1 = STRING: "12.00"
iso.3.6.1.4.1.2021.10.1.4.2 = STRING: "12.00"
iso.3.6.1.4.1.2021.10.1.4.3 = STRING: "12.00"
iso.3.6.1.4.1.2021.10.1.5.1 = INTEGER: 59
iso.3.6.1.4.1.2021.10.1.5.2 = INTEGER: 32
iso.3.6.1.4.1.2021.10.1.5.3 = INTEGER: 20
iso.3.6.1.4.1.2021.10.1.6.1 = Opaque: Float: 0.590000
iso.3.6.1.4.1.2021.10.1.6.2 = Opaque: Float: 0.320000
iso.3.6.1.4.1.2021.10.1.6.3 = Opaque: Float: 0.200000
iso.3.6.1.4.1.2021.10.1.100.1 = INTEGER: 0
iso.3.6.1.4.1.2021.10.1.100.2 = INTEGER: 0
iso.3.6.1.4.1.2021.10.1.100.3 = INTEGER: 0
iso.3.6.1.4.1.2021.10.1.101.1 = ""
iso.3.6.1.4.1.2021.10.1.101.2 = ""
iso.3.6.1.4.1.2021.10.1.101.3 = ""
wim@WimPi4-Backup:~ $ snmpwalk -Os -c public -v 2c localhost iso.3.6.1.4.1.2021.4
iso.3.6.1.4.1.2021.4.1.0 = INTEGER: 0
iso.3.6.1.4.1.2021.4.2.0 = STRING: "swap"
iso.3.6.1.4.1.2021.4.3.0 = INTEGER: 102396
iso.3.6.1.4.1.2021.4.4.0 = INTEGER: 102396
iso.3.6.1.4.1.2021.4.5.0 = INTEGER: 7998784
iso.3.6.1.4.1.2021.4.6.0 = INTEGER: 1856952
iso.3.6.1.4.1.2021.4.11.0 = INTEGER: 1959348
iso.3.6.1.4.1.2021.4.12.0 = INTEGER: 16000
iso.3.6.1.4.1.2021.4.13.0 = INTEGER: 1200
iso.3.6.1.4.1.2021.4.14.0 = INTEGER: 1999656
iso.3.6.1.4.1.2021.4.15.0 = INTEGER: 4033748
iso.3.6.1.4.1.2021.4.18.0 = Counter64: 102396
iso.3.6.1.4.1.2021.4.19.0 = Counter64: 102396
iso.3.6.1.4.1.2021.4.20.0 = Counter64: 7998784
iso.3.6.1.4.1.2021.4.21.0 = Counter64: 1856952
iso.3.6.1.4.1.2021.4.22.0 = Counter64: 1959348
iso.3.6.1.4.1.2021.4.23.0 = Counter64: 16000
iso.3.6.1.4.1.2021.4.24.0 = Counter64: 1200
iso.3.6.1.4.1.2021.4.25.0 = Counter64: 1999656
iso.3.6.1.4.1.2021.4.26.0 = Counter64: 4033748
iso.3.6.1.4.1.2021.4.100.0 = INTEGER: 0
iso.3.6.1.4.1.2021.4.101.0 = ""
wim@WimPi4-Backup:~ $ snmpwalk -Os -c public -v 2c localhost iso.3.6.1.4.1.2021.11
iso.3.6.1.4.1.2021.11.1.0 = INTEGER: 1
iso.3.6.1.4.1.2021.11.2.0 = STRING: "systemStats"
iso.3.6.1.4.1.2021.11.3.0 = INTEGER: 0
iso.3.6.1.4.1.2021.11.4.0 = INTEGER: 0
iso.3.6.1.4.1.2021.11.5.0 = INTEGER: 23
iso.3.6.1.4.1.2021.11.6.0 = INTEGER: 0
iso.3.6.1.4.1.2021.11.7.0 = INTEGER: 145
iso.3.6.1.4.1.2021.11.8.0 = INTEGER: 211
iso.3.6.1.4.1.2021.11.9.0 = INTEGER: 0
iso.3.6.1.4.1.2021.11.10.0 = INTEGER: 0
iso.3.6.1.4.1.2021.11.11.0 = INTEGER: 98
iso.3.6.1.4.1.2021.11.50.0 = Counter32: 9645
iso.3.6.1.4.1.2021.11.51.0 = Counter32: 0
iso.3.6.1.4.1.2021.11.52.0 = Counter32: 35652
iso.3.6.1.4.1.2021.11.53.0 = Counter32: 2081635
iso.3.6.1.4.1.2021.11.54.0 = Counter32: 52147
iso.3.6.1.4.1.2021.11.55.0 = Counter32: 0
iso.3.6.1.4.1.2021.11.56.0 = Counter32: 0
iso.3.6.1.4.1.2021.11.57.0 = Counter32: 9693796
iso.3.6.1.4.1.2021.11.58.0 = Counter32: 9290848
iso.3.6.1.4.1.2021.11.59.0 = Counter32: 2942581
iso.3.6.1.4.1.2021.11.60.0 = Counter32: 2871454
iso.3.6.1.4.1.2021.11.61.0 = Counter32: 964
iso.3.6.1.4.1.2021.11.62.0 = Counter32: 0
iso.3.6.1.4.1.2021.11.63.0 = Counter32: 0
iso.3.6.1.4.1.2021.11.64.0 = Counter32: 0
iso.3.6.1.4.1.2021.11.65.0 = Counter32: 0
iso.3.6.1.4.1.2021.11.66.0 = Counter32: 0
iso.3.6.1.4.1.2021.11.67.0 = INTEGER: 4The load section should be self-explanatory since it has string descriptions included in the data.
The swap section was explained as:
Total Swap Size: iso.3.6.1.4.1.2021.4.3.0
Available Swap Space: iso.3.6.1.4.1.2021.4.4.0
Total RAM in machine: iso.3.6.1.4.1.2021.4.5.0
Total RAM used: iso.3.6.1.4.1.2021.4.6.0
Total RAM Free: iso.3.6.1.4.1.2021.4.11.0
Total RAM Shared: iso.3.6.1.4.1.2021.4.13.0
Total RAM Buffered: iso.3.6.1.4.1.2021.4.14.0
Total Cached Memory: iso.3.6.1.4.1.2021.4.15.0
The systemStats section details some CPU information:
percentage of user CPU time: iso.3.6.1.4.1.2021.11.9.0
raw user cpu time: iso.3.6.1.4.1.2021.11.50.0
percentages of system CPU time: iso.3.6.1.4.1.2021.11.10.0
raw system cpu time: iso.3.6.1.4.1.2021.11.52.0
percentages of idle CPU time: iso.3.6.1.4.1.2021.11.11.0
raw idle cpu time: iso.3.6.1.4.1.2021.11.53.0
raw nice cpu time: iso.3.6.1.4.1.2021.11.51.0
wim@WimPi4-Backup:~ $ snmpwalk -Os -c public -v 2c localhost iso.3.6.1.4.1.2021.100
iso.3.6.1.4.1.2021.100.1.0 = INTEGER: 1
iso.3.6.1.4.1.2021.100.2.0 = STRING: "5.9"
iso.3.6.1.4.1.2021.100.3.0 = STRING: "$Date$"
iso.3.6.1.4.1.2021.100.4.0 = STRING: "Wed May 10 10:58:41 2023"
iso.3.6.1.4.1.2021.100.5.0 = STRING: "$Id$"
iso.3.6.1.4.1.2021.100.6.0 = STRING: " '--build=aarch64-linux-gnu' '--includedir=${prefix}/include' '--mandir=${prefix}/share/man' '--infodir=${prefix}/share/info' '--localstatedir=/var' '--disable-option-checking' '--disable-silent-rules' '--libdir=${prefix}/lib/aarch64-linux-gnu' '--runstatedir=/run' '--disable-maintainer-mode' '--disable-dependency-tracking' '--prefix=/usr' '--sysconfdir=/etc' '--mandir=/usr/share/man' '--with-persistent-directory=/var/lib/snmp' '--enable-ucd-snmp-compatibility' '--with-cflags=-g -O2 -ffile-prefix-map=/build/net-snmp-9s20VA/net-snmp-5.9+dfsg=. -fstack-protector-strong -Wformat -Werror=format-security -DNETSNMP_USE_INLINE' '--with-ldflags=-Wl,-z,relro -Wl,-z,now' '--with-perl-modules=INSTALLDIRS=vendor' '--enable-as-needed' '--with-logfile=none' '--without-rpm' '--with-libwrap' '--with-openssl' '--without-dmalloc' '--without-efence' '--without-rsaref' '--with-sys-contact=root' '--with-sys-location=Unknown' '--with-mib-modules=smux ucd-snmp/dlmod mibII/mta_sendmail disman/event-mib ucd-snmp/diskio ucd-snmp/lmsen"
iso.3.6.1.4.1.2021.100.10.0 = INTEGER: 0
iso.3.6.1.4.1.2021.100.11.0 = INTEGER: 0
iso.3.6.1.4.1.2021.100.12.0 = INTEGER: 0
iso.3.6.1.4.1.2021.100.13.0 = INTEGER: 0
iso.3.6.1.4.1.2021.100.20.0 = INTEGER: 0The most interesting detail in that section is the current system date.
wim@WimPi4-Backup:~ $ snmpwalk -Os -c public -v 2c localhost iso.3.6.1.4.1.2021.13.16
iso.3.6.1.4.1.2021.13.16.2.1.1.1 = INTEGER: 1
iso.3.6.1.4.1.2021.13.16.2.1.2.1 = STRING: "temp1"
iso.3.6.1.4.1.2021.13.16.2.1.3.1 = Gauge32: 46738I thought I might have found the system temperature, but it varies from the commands I’ve been using to monitor the temperature.
wim@WimPi4-Backup:~ $ /usr/bin/vcgencmd measure_temp
temp=43.3'C
wim@WimPi4-Backup:~ $ cat /sys/class/thermal/thermal_zone0/temp
42842If you have any suggestions if interesting things to monitor on the Pi with SNMP, please leave them in comments.
WimsWorld 