We had to downgrade to NDO2 recently since our Nagios UAT server is not updating anything on the UI . We even clean the config prior to do that
Here is the log when we start the servers
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[1690483716] Nagios 4.4.10 starting... (PID=1688)
[1690483716] Local time is Thu Jul 27 14:48:36 EDT 2023
[1690483716] LOG VERSION: 2.0
[1690483716] qh: Socket '/usr/local/nagios/var/rw/nagios.qh' successfully initialized
[1690483716] qh: core query handler registered
[1690483716] qh: echo service query handler registered
[1690483716] qh: help for the query handler registered
[1690483716] wproc: Successfully registered manager as @wproc with query handler
[1690483716] wproc: Registry request: name=Core Worker 1693;pid=1693
[1690483716] wproc: Registry request: name=Core Worker 1694;pid=1694
[1690483716] wproc: Registry request: name=Core Worker 1695;pid=1695
[1690483716] wproc: Registry request: name=Core Worker 1692;pid=1692
[1690483716] ndomod: NDOMOD 2.1.3 (2017-04-13) Copyright (c) 2009 Nagios Core Development Team and Community Contributors
[1690483716] ndomod: Could not open data sink! I'll keep trying, but some output may get lost...
[1690483716] ndomod registered for process data
[1690483716] ndomod registered for log data'
[1690483716] ndomod registered for system command data'
[1690483716] ndomod registered for event handler data'
[1690483716] ndomod registered for notification data'
[1690483716] ndomod registered for comment data'
[1690483716] ndomod registered for downtime data'
[1690483716] ndomod registered for flapping data'
[1690483716] ndomod registered for program status data'
[1690483716] ndomod registered for host status data'
[1690483716] ndomod registered for service status data'
[1690483716] ndomod registered for adaptive program data'
[1690483716] ndomod registered for adaptive host data'
[1690483716] ndomod registered for adaptive service data'
[1690483716] ndomod registered for external command data'
[1690483716] ndomod registered for aggregated status data'
[1690483716] ndomod registered for retention data'
[1690483716] ndomod registered for contact data'
[1690483716] ndomod registered for contact notification data'
[1690483716] ndomod registered for acknowledgement data'
[1690483716] ndomod registered for state change data'
[1690483716] ndomod registered for contact status data'
[1690483716] ndomod registered for adaptive contact data'
[1690483716] Event broker module '/usr/local/nagios/bin/ndomod.o' initialized successfully.
[1690483717] Successfully launched command file worker with pid 1741
[1690483743] Caught SIGTERM, shutting down...
[1690483743] Successfully shutdown... (PID=1688)
[1690483743] ndomod: Shutdown complete.
[1690483743] Event broker module '/usr/local/nagios/bin/ndomod.o' deinitialized successfully.
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systemctl status npcd
â npcd.service - Nagios Process Control Daemon
Loaded: loaded (/etc/systemd/system/npcd.service; enabled; vendor preset: disabled)
Active: inactive (dead) since Thu 2023-07-27 14:49:02 EDT; 4min 7s ago
Process: 1244 ExecStart=/usr/local/nagios/bin/npcd -f /usr/local/nagios/etc/pnp/npcd.cfg (code=exited, status=0/SUCCESS)
Main PID: 1244 (code=exited, status=0/SUCCESS)
systemctl status nagios
â nagios.service - Nagios Core 4.4.13
Loaded: loaded (/usr/lib/systemd/system/nagios.service; enabled; vendor preset: disabled)
Active: inactive (dead) since Thu 2023-07-27 14:49:03 EDT; 4min 9s ago
Docs: https://www.nagios.org/documentation
Process: 1892 ExecStopPost=/bin/rm -f /usr/local/nagios/var/rw/nagios.cmd (code=exited, status=0/SUCCESS)
Process: 1888 ExecStop=/bin/kill -s TERM ${MAINPID} (code=exited, status=0/SUCCESS)
Process: 1683 ExecStart=/usr/local/nagios/bin/nagios -d /usr/local/nagios/etc/nagios.cfg (code=exited, status=0/SUCCESS)
Process: 1661 ExecStartPre=/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg (code=exited, status=0/SUCCESS)
Main PID: 1688 (code=exited, status=0/SUCCESS)
systemctl status ndo2db
â ndo2db.service - Nagios Data Out Daemon
Loaded: loaded (/usr/lib/systemd/system/ndo2db.service; enabled; vendor preset: disabled)
Active: failed (Result: exit-code) since Thu 2023-07-27 14:48:36 EDT; 4min 41s ago
Docs: http://www.nagios.org/documentation
Process: 1664 ExecStopPost=/bin/rm -f /usr/local/nagios/var/ndo2db.lock (code=exited, status=0/SUCCESS)
Process: 1660 ExecStart=/usr/local/nagios/bin/ndo2db -c /usr/local/nagios/etc/ndo2db.cfg -f (code=exited, status=203/EXEC)
Process: 1658 ExecStartPre=/bin/rm -f /usr/local/nagios/var/ndo.sock (code=exited, status=0/SUCCESS)
Process: 1657 ExecStartPre=/bin/rm -f /usr/local/nagios/var/ndo2db.lock (code=exited, status=0/SUCCESS)
Main PID: 1660 (code=exited, status=203/EXEC)
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NAME="Red Hat Enterprise Linux Server"
VERSION="7.9 (Maipo)"
ID="rhel"
ID_LIKE="fedora"
VARIANT="Server"
VARIANT_ID="server"
VERSION_ID="7.9"
PRETTY_NAME="Red Hat Enterprise Linux Server 7.9 (Maipo)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:redhat:enterprise_linux:7.9:GA:server"
HOME_URL="https://www.redhat.com/"
BUG_REPORT_URL="https://bugzilla.redhat.com/"
REDHAT_BUGZILLA_PRODUCT="Red Hat Enterprise Linux 7"
REDHAT_BUGZILLA_PRODUCT_VERSION=7.9
REDHAT_SUPPORT_PRODUCT="Red Hat Enterprise Linux"
REDHAT_SUPPORT_PRODUCT_VERSION="7.9"