net-snmpd-lvs-module is a dynamicaly loadable shared object for SNMP to get the configuration and some statistical information from the Linux kernel with IP virtual server support.
Get the source for this module (local copy or Alternate source location). From http://www.linuxvirtualserver.org/software/ipvs.html download the the correct version of ipvsadm, for kernel 2.6 use ipvsadm-1.24 or later, for kernel 2.4 use ipvsadm-1.21. Extract ipvsadm-version.tar.gz, build the library and copy the subtree libipvs into the module's working directory.
Check that the Linux kernel is available under /usr/src/linux. Install net-snmp and its development headers and libraries. Invoke make, this should build lvs.so. Copy LVS-MIB.txt and OC-MIB.txt to /usr/share/snmp/mibs/.
Check that the new MIB is visible by invoking
shell> snmptranslate -m LVS-MIB -On -IR lvsServiceEntry
this should return .18.104.22.168.4.1.8225.4711.18.1 Copy lvs.so to /usr/lib/libnetsnmplvs.so and add the following line to /etc/snmp/snmpd.conf:
dlmod lvs /usr/lib/libnetsnmplvs.so
Restart your snmpd.
Try if everything works invoking:
shell> snmpwalk -c public -v 2c -m LVS-MIB localhost 22.214.171.124.4.1.8225.4711 LVS-MIB::lvsVersion.0 = STRING: "1.2.0" LVS-MIB::lvsNumServices.0 = INTEGER: 2 LVS-MIB::lvsHashTableSize.0 = INTEGER: 4096 LVS-MIB::lvsTcpTimeOut.0 = INTEGER: 900 LVS-MIB::lvsTcpFinTimeOut.0 = INTEGER: 120 LVS-MIB::lvsUdpTimeOut.0 = INTEGER: 300 LVS-MIB::lvsDaemonState.0 = INTEGER: none(0) ...
In case you want to add additional snmp-values to your MIB: Set export MIBS=ALL and create skeleton with
shell> mib2c -c mib2c.interate.conf lvsRealTable
shell> mib2c -c mib2c.interate.conf lvsServiceTable
this should create a file lvsRealTable.c and/or lvsServiceTable.c. Use the generated code as a template for lvs.c and populate the missing parts.
If you find an output for like this:
[root@machine ~]# snmpwalk -c public -v 2c -m LVS-MIB localhost 126.96.36.199.4.1.8225.4711 LVS-MIB::lvs = No more variables left in this MIB View (It is past the end of the MIB tree)
I found the solution to be [quite] less conservative with snmpd.conf here:
«You can add following lines to snmpd.conf ('+' marks which line was added). This is an example and you should be very careful in granting access to your snmp coz potentially it can be a security issue:»
+view all included .1 view systemview included .188.8.131.52.2.1.1
+access notConfigGroup "" any noauth exact all none none access notConfigGroup "" any noauth exact systemview none none
This was verified in CentOS 5.2.
The code for this module currently is maintained by Jacob Rief. This code is based on ucd-snmpd-lvs written by Romeo Benzoni in 2002 and never modified since. As that code did not compile with the newer net-snmp headers, I decided to rewrite the complete code. The only unchanged parts from the ucd-snmpd-lvs project are LVS-MIB.txt and OC-MIB.txt.
The official site does not exist any more, since I left that company. If somebody gives me access to the repository, I will maintain the module there, otherwise I will have to create one at Google-code.