So, Raspberry Pi OS, latest of this date, only has Net-SNMP 5.7.3
available in the official repository. This works, but a few
informational errors result, such as the given version still reports
attempting to access the PCI bus, which Pi devices lack. I have seen
references to this issue being fix... but I guess the fix was reverted
or not applied by the package owner?
The package owner of the Debian 10 (Buster) package for Pi OS, has not
updated the official package for a very long time as well, it appears.
I figured I should be able to compile 5.9, which I downloaded and
compiled using the posted instructions on Source Forge. Other than the
tweak for shared library issue, and a few compiler warnings, the make
and make install worked fine. I did have to add the libperl-dev package
as well. but I suspect that is only because running ./configure I
accepted all the defaults, which includes the Perl support?
But I have a few questions outstanding.
1) Is there a better way to upgrade to 5.9? Right now I have 5.7.3 and
5.9 both, which I don't really need.
2) Since I already had the current official package installed,
/etc/snmp/snmpd.conf existed, is there anything new or special under 5.9
that is different from 5.7.3 in the snmpd.conf of key importance? Ran
snmpconf -g basic_setup, to generate a newer conf file, seems to work
fine, I did not setup any OID restrictions.
3) I had to make a small change to the unit file for snmpd, to match the
one referenced in the 5.9 sources. This change included changes to the
path and the command line parameters for snmpd. Can someone please
explain why the drastic change in the command line parameters used with
5.7.3, but not 5.9?
For example... Original 5.9 unit file I had to change the path...
-----
#
# SNMP agent service file for systemd
#
#
# The service should be enabled, i.e. snmpd should start during machine
boot.
# Socket activation shall not be used. See README.systemd for details.
[Unit]
Description=Simple Network Management Protocol (SNMP) daemon.
After=syslog.target network.target
[Service]
# Type=notify is also supported. It should be set when snmpd.socket is
not used.
Type=simple
#ExecStart=/usr/sbin/snmpd -f
ExecStart=/usr/local/sbin/snmpd -f
[Install]
WantedBy=multi-user.target
-----
And the 5.7.3 unit file was quite different, especially the command line
parameters for snmpd...
-----
[Unit]
Description=Simple Network Management Protocol (SNMP) Daemon.
After=network.target
ConditionPathExists=/etc/snmp/snmpd.conf
[Service]
Environment="MIBSDIR=/usr/share/snmp/mibs:/usr/share/snmp/mibs/iana:/usr/share/snmp/mibs/ietf:/usr/share/mibs/site:/usr/share/snmp/mibs:/usr/share/mibs/iana:/usr/share/mibs/ietf:/usr/share/mibs/netsnmp"
Environment="MIBS="
Type=simple
ExecStartPre=/bin/mkdir -p /var/run/agentx
ExecStart=/usr/sbin/snmpd -Lsd -Lf /dev/null -u Debian-snmp -g
Debian-snmp -I -smux,mteTrigger,mteTriggerConf -f -p /run/snmpd.pid
ExecReload=/bin/kill -HUP $MAINPID
[Install]
WantedBy=multi-user.target
-----
3) I have done a few basic snmp queries, and so far so good, I think.
Anything I am missing here? Interesting that the snmpd.conf location
has changed to /usr/local/share/snmp/.
# netstat -ntulp | grep 161
udp 0 0 0.0.0.0:161 0.0.0.0:*
5543/snmpd
udp6 0 0 ::1:161 :::* 5543/snmpd
For example...
# snmpwalk -Os -c [redacted] -v 1 192.168.1.139 .1.3.6.1.2.1.1.1
sysDescr.0 = STRING: Linux raspberrypi 5.10.11+ #1399 Thu Jan 28
12:02:28 GMT 2021 armv6l
Thanks in advance.
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