SNMPD spamming /var/log/messages is a pet hate of mine. It causes so much rubbish to be sat in the logs. I had a hard time looking for how to do this on centos 7. I eventually managed to work it so im adding it here as i wasnt able to find the relevant resource online.
CD into the relevant directory
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[root@home-server ~]# cd /etc/systemd/system/multi-user.target.wants
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[root@home-server multi-user.target.wants]# vi snmpd.service
Change the Environment variable as so:
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Environment=OPTIONS="-LS0-5d"
Close vi
Restart the service
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[root@home-server multi-user.target.wants]# systemctl restart snmpd.service
Say good bye to all these messages!
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Apr 19 03:25:41 home-server snmpd[980]: Connection from UDP: [192.168.*.*]:39604->[192.168.*.*]:161