The install seemed to go OK and have disabled SElinux
starting the service seems to work and I see the following when running ps -eaf
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[root@prometheus nagios]# ps -eaf | grep nagios
nagios 1825 1 0 17:11 ? 00:00:00 /usr/sbin/nagios -d /etc/nagios/nagios.cfg
nagios 1829 1825 0 17:11 ? 00:00:00 /usr/sbin/nagios --worker /var/spool/nagios/cmd/nagios.qh
nagios 1830 1825 0 17:11 ? 00:00:00 /usr/sbin/nagios --worker /var/spool/nagios/cmd/nagios.qh
nagios 1831 1825 0 17:11 ? 00:00:00 /usr/sbin/nagios --worker /var/spool/nagios/cmd/nagios.qh
nagios 1832 1825 0 17:11 ? 00:00:00 /usr/sbin/nagios --worker /var/spool/nagios/cmd/nagios.qh
nagios 1833 1825 0 17:11 ? 00:00:00 /usr/sbin/nagios --worker /var/spool/nagios/cmd/nagios.qh
nagios 1834 1825 0 17:11 ? 00:00:00 /usr/sbin/nagios --worker /var/spool/nagios/cmd/nagios.qh
nagios 1837 1825 0 17:11 ? 00:00:00 /usr/sbin/nagios -d /etc/nagios/nagios.cfg
root 2135 2043 0 17:23 pts/1 00:00:00 grep nagios
Can't see anything obvious in the nagios.log
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[1517505097] Nagios 4.3.4 starting... (PID=1825)
[1517505097] Local time is Thu Feb 01 17:11:37 GMT 2018
[1517505097] LOG VERSION: 2.0
[1517505097] qh: Socket '/var/spool/nagios/cmd/nagios.qh' successfully initialized
[1517505097] qh: core query handler registered
[1517505097] nerd: Channel hostchecks registered successfully
[1517505097] nerd: Channel servicechecks registered successfully
[1517505097] nerd: Channel opathchecks registered successfully
[1517505097] nerd: Fully initialized and ready to rock!
[1517505097] wproc: Successfully registered manager as @wproc with query handler
[1517505097] wproc: Registry request: name=Core Worker 1829;pid=1829
[1517505097] wproc: Registry request: name=Core Worker 1830;pid=1830
[1517505097] wproc: Registry request: name=Core Worker 1832;pid=1832
[1517505097] wproc: Registry request: name=Core Worker 1831;pid=1831
[1517505097] wproc: Registry request: name=Core Worker 1833;pid=1833
[1517505097] wproc: Registry request: name=Core Worker 1834;pid=1834
[1517505097] Successfully launched command file worker with pid 1837
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[root@prometheus nagios]# getenforce
Disabled
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[root@prometheus nagios]# /usr/sbin/nagios -v /etc/nagios/nagios.cfg
Nagios Core 4.3.4
Copyright (c) 2009-present Nagios Core Development Team and Community Contributors
Copyright (c) 1999-2009 Ethan Galstad
Last Modified: 2017-08-24
License: GPL
Website: https://www.nagios.org
Reading configuration data...
Read main config file okay...
Read object config files okay...
Running pre-flight check on configuration data...
Checking objects...
Checked 8 services.
Checked 1 hosts.
Checked 1 host groups.
Checked 0 service groups.
Checked 1 contacts.
Checked 1 contact groups.
Checked 24 commands.
Checked 5 time periods.
Checked 0 host escalations.
Checked 0 service escalations.
Checking for circular paths...
Checked 1 hosts
Checked 0 service dependencies
Checked 0 host dependencies
Checked 5 timeperiods
Checking global event handlers...
Checking obsessive compulsive processor commands...
Checking misc settings...
Total Warnings: 0
Total Errors: 0
Things look okay - No serious problems were detected during the pre-flight check
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nagios-common-4.3.4-7.el6.x86_64
nagios-plugins-perl-2.2.1-4git.el6.x86_64
nagios-plugins-ntp-perl-2.2.1-4git.el6.x86_64
nagios-plugins-breeze-2.2.1-4git.el6.x86_64
nagios-plugins-flexlm-2.2.1-4git.el6.x86_64
nagios-plugins-file_age-2.2.1-4git.el6.x86_64
nagios-plugins-mailq-2.2.1-4git.el6.x86_64
nagios-plugins-ups-2.2.1-4git.el6.x86_64
nagios-plugins-dhcp-2.2.1-4git.el6.x86_64
nagios-plugins-cluster-2.2.1-4git.el6.x86_64
nagios-plugins-mrtgtraf-2.2.1-4git.el6.x86_64
nagios-plugins-time-2.2.1-4git.el6.x86_64
nagios-plugins-ldap-2.2.1-4git.el6.x86_64
nagios-plugins-real-2.2.1-4git.el6.x86_64
nagios-plugins-procs-2.2.1-4git.el6.x86_64
nagios-plugins-mysql-2.2.1-4git.el6.x86_64
nagios-plugins-overcr-2.2.1-4git.el6.x86_64
nagios-plugins-oracle-2.2.1-4git.el6.x86_64
nagios-plugins-hpjd-2.2.1-4git.el6.x86_64
nagios-plugins-disk-2.2.1-4git.el6.x86_64
nagios-plugins-ping-2.2.1-4git.el6.x86_64
nagios-plugins-http-2.2.1-4git.el6.x86_64
nagios-plugins-smtp-2.2.1-4git.el6.x86_64
nagios-plugins-sensors-2.2.1-4git.el6.x86_64
nagios-plugins-fping-2.2.1-4git.el6.x86_64
nagios-plugins-game-2.2.1-4git.el6.x86_64
nagios-plugins-pgsql-2.2.1-4git.el6.x86_64
nagios-4.3.4-7.el6.x86_64
nagios-plugins-2.2.1-4git.el6.x86_64
nagios-plugins-snmp-2.2.1-4git.el6.x86_64
nagios-plugins-disk_smb-2.2.1-4git.el6.x86_64
nagios-plugins-wave-2.2.1-4git.el6.x86_64
nagios-plugins-ircd-2.2.1-4git.el6.x86_64
nagios-plugins-rpc-2.2.1-4git.el6.x86_64
nagios-plugins-dummy-2.2.1-4git.el6.x86_64
nagios-plugins-nagios-2.2.1-4git.el6.x86_64
nagios-plugins-ntp-2.2.1-4git.el6.x86_64
nagios-plugins-load-2.2.1-4git.el6.x86_64
nagios-plugins-ssh-2.2.1-4git.el6.x86_64
nagios-plugins-tcp-2.2.1-4git.el6.x86_64
nagios-plugins-mrtg-2.2.1-4git.el6.x86_64
nagios-plugins-by_ssh-2.2.1-4git.el6.x86_64
nagios-plugins-nwstat-2.2.1-4git.el6.x86_64
nagios-plugins-nt-2.2.1-4git.el6.x86_64
nagios-plugins-users-2.2.1-4git.el6.x86_64
nagios-plugins-icmp-2.2.1-4git.el6.x86_64
nagios-plugins-log-2.2.1-4git.el6.x86_64
nagios-plugins-ide_smart-2.2.1-4git.el6.x86_64
nagios-plugins-dns-2.2.1-4git.el6.x86_64
nagios-plugins-dig-2.2.1-4git.el6.x86_64
nagios-plugins-swap-2.2.1-4git.el6.x86_64
nagios-plugins-all-2.2.1-4git.el6.x86_64