One more note about this... this morning I had an itch I could not
scratch, about why the entire issue resulted. So, I completely
uninstalled net-snmp-5.9 via make uninstall, deleted the source
directory, then I installed the existing official net-snmp package for
Debian 10 buster (which is 5.7.1 if memory serves), I validated snmp was
working as expected. I then uninstalled the official package via apt
remove --purge. Copied down a clean copy of net-snmp 5.9 and proceeded
following my notes, running configure, make, and make install. I
confirmed that /usr/local/sbin is the default path, I confirmed that
/usr/local/sbin, was in libc.conf under /etc/ld.so.conf.d/, and then ran
ldd. This time ldd did not report any missing libraries? That strikes
me as odd! So I guess the next step is a completely clean Debian 10
buster OS install, and see if I can get any consistency for the issue or
not. Clearly this issue occurs because there is enough communication
about it via Google search. And clearly I did trip over it yesterday.
But it is a bit of mystery at this point how or why.
-DD
On 5/14/2021 09:39, Dachshund Digital wrote:
Actually I figured this out... not completely sure why it happens on
my system, and I found a few references to it happening for others via
google as well... so it is not a one off issue per se.
One odd quirk is that my install of net-snmp defaults on Debian 10
/usr/local/sbin, not /usr/sbin/, I ran ./configure with no added
options for not sure why this delta emerges. But this is only an
issue for the unit file (systemd) default file that needs to be
tweaked for the different path. It is this difference in path that
resulted that is at the heart of the issue. But I digress, to fix the
'not found' (they do exist, just not found) libraries issue there are
two options to that I have found that work.
Option 1:
Edit the hidden bashrc file for the user that will run snmpd, add
the the following line...
export LD_LIBRARY_PATH=/usr/local/lib
Logout and login to invoke bashrc execution.
Option 2, which I like better is to do the following...
Check for or Create /etc/ld.so.conf.d/libc.conf. Some systems I
reviewed had libc.conf with the needed path, some did not. One google
reference created a local.conf file with the same path as well.
# nano /etc/ld.so.conf.d/libc.conf
/usr/local/lib
Then run ldconfig
After the above changes...
# ldd /usr/local/sbin/snmpd
linux-gate.so.1 (0xb7fa8000)
libnetsnmpagent.so.40 => /usr/local/lib/libnetsnmpagent.so.40
(0xb7f1c000)
libnetsnmpmibs.so.40 => /usr/local/lib/libnetsnmpmibs.so.40
(0xb7cc7000)
libnetsnmp.so.40 => /usr/local/lib/libnetsnmp.so.40 (0xb7be5000)
libperl.so.5.28 => /usr/lib/i386-linux-gnu/libperl.so.5.28
(0xb787d000)
libdl.so.2 => /lib/i386-linux-gnu/libdl.so.2 (0xb7877000)
libpthread.so.0 => /lib/i386-linux-gnu/libpthread.so.0
(0xb7856000)
libc.so.6 => /lib/i386-linux-gnu/libc.so.6 (0xb7678000)
libcrypt.so.1 => /lib/i386-linux-gnu/libcrypt.so.1 (0xb7645000)
libm.so.6 => /lib/i386-linux-gnu/libm.so.6 (0xb753f000)
/lib/ld-linux.so.2 (0xb7faa000)
The libraries that were not found are now found! This should let
snmpd fine the libraries as expected, via direct run or via systemd
unit file for same. Providing you update the unit file for the path
delta as noted above.Just for reference, the tweaked unit file is
below... For my test, I did not create a specific user, used root.
This is not a best practice, the current Debian 10 package (based on
5.7.1) uses 'Debian-snmp' as execution user, you should consider doing
this if moving to 5.9 when compiled from source.
# cat /lib/systemd/system/snmpd.service
[Unit]
Description=Simple Network Management Protocol (SNMP) daemon.
After=syslog.target network.target
[Service]
Type=simple
ExecStartPre=/bin/mkdir -p /var/run/agentx
#ExecStart=/usr/local/sbin/snmpd -LS6d -Lf /dev/null -u Debian-snmp -g
Debian-snmp -I -smux,mteTrigger,mteTriggerConf -f -p /run/snmpd.pid
ExecStart=/usr/local/sbin/snmpd -LS6d -Lf /dev/null -I
-smux,mteTrigger,mteTriggerConf -f -p /run/snmpd.pid
ExecReload=/bin/kill -HUP $MAINPID
[Install]
WantedBy=multi-user.target
-DD
On 5/13/2021 20:25, Bart Van Assche wrote:
I can't reproduce this. If I build and install Net-SNMP from the v5.9
branch, the installed binary runs fine:
|./configure --enable-developer --enable-ipv6
--prefix=/home/bart/net-snmp-V5-9-patches --with-cflags=-g -O1 -pipe
-DNETSNMP_USE_ASSERT -D_FORTIFY_SOURCE=2 -fno-strict-aliasing
-fno-inline -fno-inline-functions -fno-inline-functions- called-once
-fno-early-inlining -Wno-inline -fno-inline-small-functions -DNETSN
MP_USE_ASSERT --with-defaults --enable-new-features
--with-perl-modules --with- default-snmp-version=2
--with-transports=IPX STD DTLSUDP TLSTCP --with-security -modules=usm
tsm --with-mib-modules=agent/extend examples/data_set examples/del
ayed_instance examples/example examples/notification
examples/scalar_int exampl es/ucdDemoPublic examples/watched smux
disman/event disman/expression disman/mt eEventNotificationTable
disman/mteEventTable disman/mteObjectsTable disman/mteT
riggerBooleanTable disman/mteTriggerDeltaTable
disman/mteTriggerExistenceTable disman/mteTriggerTable
disman/mteTriggerThresholdTable disman/nslookup-mib dism an/ping-mib
disman/schedule disman/traceroute-mib examples/netSnmpHostsTable ha
rdware/cpu hardware/memory host ip-forward-mib
ip-mib/inetNetToMediaTable ip-mi b/ipv4InterfaceTable
ip-mib/ipv6InterfaceTable mibII/mta_sendmail misc/ipfwacc
snmp-notification-mib tcp-mib testhandler tunnel ucd-snmp/diskio
ucd-snmp/exten sible udp-mib Rmon Rmon/alarm snmp-usm-dh-objects-mib
tlstm-mib tsm-mib --with- ldflags=-L/usr/local/lib CFLAGS=-g -O1
-pipe -DNETSNMP_USE_ASSERT -D_FORTIFY_SO URCE=2 -fno-strict-aliasing
-fno-inline -fno-inline-functions -fno-inline-func tions-called-once
-fno-early-inlining -Wno-inline -fno-inline-small-functions C
PPFLAGS=-g -O1 -pipe -DNETSNMP_USE_ASSERT -D_FORTIFY_SOURCE=2
-fno-strict-aliasing -fno-inline -fno-inline-functions
-fno-inline-functions-called-once -fno-early-inlining -Wno-inline
-fno-inline-small-functions LDFLAGS= && make && make install |
From the installation directory (/home/bart/net-snmp-V5-9-patches):
|$ ldd sbin/snmpd linux-vdso.so.1 (0x00007ffd7f3d8000)
libnetsnmpagent.so.40 =>
/home/bart/net-snmp-V5-9-patches/lib/libnetsnmpagent.so.40
(0x00007fd958ca7000) libnetsnmpmibs.so.40 =>
/home/bart/net-snmp-V5-9-patches/lib/libnetsnmpmibs.so.40
(0x00007fd95899d000) libnetsnmp.so.40 =>
/home/bart/net-snmp-V5-9-patches/lib/libnetsnmp.so.40
(0x00007fd9588c0000) libpthread.so.0 =>
/lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fd958897000) libc.so.6
=> /lib/x86_64-linux-gnu/libc.so.6 (0x00007fd9586d2000)
libperl.so.5.32 => /lib/x86_64-linux-gnu/libperl.so.5.32
(0x00007fd958344000) libcrypto.so.1.1 =>
/lib/x86_64-linux-gnu/libcrypto.so.1.1 (0x00007fd95804e000)
libpci.so.3 => /lib/x86_64-linux-gnu/libpci.so.3 (0x00007fd95803d000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fd958037000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fd957ef3000)
libssl.so.1.1 => /lib/x86_64-linux-gnu/libssl.so.1.1
(0x00007fd957e60000) /lib64/ld-linux-x86-64.so.2 (0x00007fd958d27000)
libcrypt.so.1 => /lib/x86_64-linux-gnu/libcrypt.so.1
(0x00007fd957e25000) libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1
(0x00007fd957e06000) libresolv.so.2 =>
/lib/x86_64-linux-gnu/libresolv.so.2 (0x00007fd957dec000)
libudev.so.1 => /lib/x86_64-linux-gnu/libudev.so.1
(0x00007fd957dc4000) $ ./sbin/snmpd -f -Lo -c
~/software/tools/snmpd.conf -r :1161 [ snmpd runs fine ] |
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