I have five web servers, centos7 and net-snmp, 1:5.7.2-43.el7. I'm also running fail2ban. On the first four web servers, fail2ban is at 0.10.4-1.el7, but on more recently built web5, fail2ban is at 0.10.5-2.el7.
This morning, nagios reported that it couldn't find the fail2ban process on web5, though not on any of the others. The check is against HOST-RESOURCES-MIB::hrSWRunName. Investigation with snmpwalk shows that web5 does not have an entry for fail2ban-server in the hrSWRunName table. Webs 1-4 do. 'ps ax' looks identical, as does the contents of /proc/PID/cmdline. Note that the command line is "/usr/bin/python -s /usr/bin/fail2ban-server -xf start" On webs 1-4, HOST-RESOURCES-MIB::hrSWRunName contains "fail2ban-server". On Web5, the variable contains "/usr/bin/python". Since all of my servers will soon upgrade to the newer fail2ban version, I expect to lose my nagios test for this process, unless I can figure out what is going on. Can somebody tell me where does net-snmp get it's process names? Why would they be different? Same version of net-snmp. Different versions of fail2ban as indicated above. Perhaps I can find an SNMP test for HOST-RESOURCES-MIB::hrSWRunParameters. Thanks, Ed Greenberg
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