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Description of problem:
The snmpd service reporting error for hostname resolution which are configured in /etc/snmpd.conf at boot
cannot resolve source hostname
# vi /etc/snmp/snmpd.conf
rocommunity public_server node2.example.com
rocommunity public_server node3.example.com
rocommunity public_server node4.example.com
rocommunity public_server node5.example.com
At boot these hostnames are not getting resolved due to dependencies of unit files.
Nov 19 12:41:18 node1 NetworkManager[1181]: <info> [1574163678.0176] hostname: hostname: using hostnamed
Nov 19 12:41:18 node1 NetworkManager[1181]: <info> [1574163678.0179] hostname: hostname changed from (none) to "node1.example.com"
Nov 19 12:41:18 node1 NetworkManager[1181]: <info> [1574163678.0184] dns-mgr[0x555ae735a250]: init: dns=default,systemd-resolved rc-manager=symlink
Nov 19 12:41:18 node1 crond[1257]: (CRON) INFO (running with inotify support)
Nov 19 12:41:18 node1 snmpd[1238]: /etc/snmp/snmpd.conf: line 44: Error: cannot resolve source hostname
Nov 19 12:41:18 node1 snmpd[1238]: /etc/snmp/snmpd.conf: line 45: Error: cannot resolve source hostname
Nov 19 12:41:18 node1 snmpd[1238]: /etc/snmp/snmpd.conf: line 46: Error: cannot resolve source hostname
Nov 19 12:41:18 node1 snmpd[1238]: /etc/snmp/snmpd.conf: line 47: Error: cannot resolve source hostname
Nov 19 12:41:18 node1 snmpd[1238]: net-snmp: 4 error(s) in config file(s)
Nov 19 12:41:18 node1 NetworkManager[1181]: <info> [1574163678.0899] Loaded device plugin: NMTeamFactory (/usr/lib64/NetworkManager/1.20.0-3.el8/libnm-device-plugin-team.so)
Nov 19 12:41:18 node1 NetworkManager[1181]: <info> [1574163678.0900] manager: rfkill: Wi-Fi enabled by radio killswitch; enabled by state file
Nov 19 12:41:18 node1 NetworkManager[1181]: <info> [1574163678.0901] manager: rfkill: WWAN enabled by radio killswitch; enabled by state file
Nov 19 12:41:18 node1 NetworkManager[1181]: <info> [1574163678.0902] manager: Networking is enabled by state file
The snmpd service depends on network-online.target instead of network.target.
[Unit]
Description=Simple Network Management Protocol (SNMP) Daemon.
After=syslog.target network.target
Version-Release number of selected component (if applicable):
How reproducible:
5.8-10.el8.x86_64
Steps to Reproduce:
1. Configure hostnames in community strings
2. Reboot the system
3.
Actual results:
snmpd reports Error: cannot resolve source hostname
Expected results:
snmpd should start only after network-online.target and should resolve the hostnames.
Additional info:
Similar bugzilla filed for RHEL 7.2 :
Bug 1388118 - snmpd starts before the network stack is online (network.target vs network-online.target)
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory (net-snmp bug fix and enhancement update), and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2020:4576