Keepalived loses contact with snmpd when snmpd restarts

I'm just starting to experiment with enabling SNMP on keepalived (the "-x"
option) and I'm seeing some strangeness.  In particular, sometimes snmpd
loses contact with keepalived and all SNMP requests are rejected.

I've narrowed the problem down to the following situation: keepalived has
to start after snmpd.  If you restart snmpd, SNMP queries related to
keepalived fail until keepalived is restarted.  Simply reloading snmpd
doesn't have this problem.

Here's a session where I demonstrate the problem:


#
# snmpwalk -v2c -c public  localhost KEEPALIVED-MIB::vrrpInstanceTable
KEEPALIVED-MIB::vrrpInstanceName.1 = STRING: VI_V4_LO
...(good output)...
# service snmpd reload           <<< RELOAD WORKS FINE
Reloading snmpd:                                           [  OK  ]
# snmpwalk -v2c -c public  localhost KEEPALIVED-MIB::vrrpInstanceTable
KEEPALIVED-MIB::vrrpInstanceName.1 = STRING: VI_V4_LO
...(good output)...
# service snmpd restart           <<< RESTART... NOW WE'LL HAVE TROUBLE
Stopping snmpd:                                            [  OK  ]
Starting snmpd:                                            [  OK  ]
# snmpwalk -v2c -c public  localhost KEEPALIVED-MIB::vrrpInstanceTable
KEEPALIVED-MIB::vrrpInstanceTable = No Such Object available on this agent
at this OID
# snmpwalk -v2c -c public  localhost KEEPALIVED-MIB::vrrpInstanceTable
KEEPALIVED-MIB::vrrpInstanceTable = No Such Object available on this agent
at this OID
# service keepalived restart         <<< RESTART KEEKALIVED TO FIX
Stopping keepalived:                                       [  OK  ]
Starting keepalived:                                       [  OK  ]
# snmpwalk -v2c -c public  localhost KEEPALIVED-MIB::vrrpInstanceTable
KEEPALIVED-MIB::vrrpInstanceName.1 = STRING: VI_V4_LO
...(good output)...
#
#
# cat /etc/redhat-release
CentOS release 6.6 (Final)
# keepalived --version
Keepalived v1.2.13 (03/19,2015)
# snmpd --version

NET-SNMP version:  5.5
Web:               http://www.net-snmp.org/
Email:             [email protected]


Sadly the fix is to restart keepalived.  If the host is master, the system
transitions to being BACKUP.

Can anyone else reproduce this situation?  is there a fix or workaround?

Thanks!
Tom

-- 
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Skype: YesThatTom
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