Nagios Server on Rocky Linux 9.5 FIPS with EPEL Packages Setup

  • I went through the exact same setup steps as I listed before.
  • Enabled the EPEL repo: 
    dnf config-manager --set-enabled powertools
dnf install epel-release
  • Installed the nagios package: 
    dnf install -y nagios
  • Continued on from the “* Added the apache user to the nagios group:” step: 
    usermod -a -G nagios apache
  • Enabled the httpd.service file: 
    systemctl enable httpd.service
  • Disabled the firewall: 
    systemctl disable --now firewalld
  • Disabled SELinux: 
    setenforce 0
sed -i 's/SELINUX=enforcing/SELINUX=permissive/' /etc/selinux/config
  • Installed the nagios-plugins-all package: 
    dnf install -y nagios-plugins-all
  • Installed the nrpe plugin: 
    dnf install -y nrpe
  • No problems with the nagios configuration: 
    nagios -v /etc/nagios/nagios.cfg
Total Warnings: 0
Total Errors:   0
  • Started the httpd service: 
    systemctl enable --now httpd.service
  • Output from systemctl status httpd: ``` ● httpd.service - The Apache HTTP Server Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor preset: disabled) Drop-In: /usr/lib/systemd/system/httpd.service.d └─php-fpm.conf Active: active (running) since Wed 2025-01-22 06:08:36 UTC; 4s ago Docs: man:httpd.service(8) Main PID: 5779 (httpd) Status: “Started, listening on: port 80” Tasks: 213 (limit: 48980) Memory: 44.6M CGroup: /system.slice/httpd.service ├─5779 /usr/sbin/httpd -DFOREGROUND ├─5785 /usr/sbin/httpd -DFOREGROUND ├─5786 /usr/sbin/httpd -DFOREGROUND ├─5787 /usr/sbin/httpd -DFOREGROUND └─5788 /usr/sbin/httpd -DFOREGROUND

Jan 22 06:08:36 rocky-linux-810-fips-nagios-server systemd[1]: Starting The Apache HTTP Server… Jan 22 06:08:36 rocky-linux-810-fips-nagios-server httpd[5779]: AH00558: httpd: Could not reliably determine the server’s fully qualified domain name, using ::1. Set the ‘Serv> Jan 22 06:08:36 rocky-linux-810-fips-nagios-server systemd[1]: Started The Apache HTTP Server.

* Started the `nagios` service:

systemctl enable –now nagios.service

* From `systemctl status nagios`, this also started without issue:

● nagios.service - Nagios Core 4.4.9 Loaded: loaded (/usr/lib/systemd/system/nagios.service; enabled; vendor preset: disabled) Active: active (running) since Wed 2025-01-22 06:09:26 UTC; 13s ago Docs: https://www.nagios.org/documentation Process: 6040 ExecStart=/usr/sbin/nagios -d /etc/nagios/nagios.cfg (code=exited, status=0/SUCCESS) Process: 6038 ExecStartPre=/usr/sbin/nagios -v /etc/nagios/nagios.cfg (code=exited, status=0/SUCCESS) Main PID: 6041 (nagios) Tasks: 8 (limit: 48980) Memory: 7.1M CGroup: /system.slice/nagios.service ├─6041 /usr/sbin/nagios -d /etc/nagios/nagios.cfg ├─6042 /usr/sbin/nagios –worker /var/spool/nagios/cmd/nagios.qh ├─6043 /usr/sbin/nagios –worker /var/spool/nagios/cmd/nagios.qh ├─6044 /usr/sbin/nagios –worker /var/spool/nagios/cmd/nagios.qh ├─6045 /usr/sbin/nagios –worker /var/spool/nagios/cmd/nagios.qh ├─6046 /usr/sbin/nagios –worker /var/spool/nagios/cmd/nagios.qh ├─6047 /usr/sbin/nagios –worker /var/spool/nagios/cmd/nagios.qh └─6048 /usr/sbin/nagios -d /etc/nagios/nagios.cfg

Jan 22 06:09:26 rocky-linux-810-fips-nagios-server nagios[6041]: qh: echo service query handler registered Jan 22 06:09:26 rocky-linux-810-fips-nagios-server nagios[6041]: qh: help for the query handler registered Jan 22 06:09:26 rocky-linux-810-fips-nagios-server nagios[6041]: wproc: Successfully registered manager as @wproc with query handler Jan 22 06:09:26 rocky-linux-810-fips-nagios-server nagios[6041]: wproc: Registry request: name=Core Worker 6045;pid=6045 Jan 22 06:09:26 rocky-linux-810-fips-nagios-server nagios[6041]: wproc: Registry request: name=Core Worker 6046;pid=6046 Jan 22 06:09:26 rocky-linux-810-fips-nagios-server nagios[6041]: wproc: Registry request: name=Core Worker 6042;pid=6042 Jan 22 06:09:26 rocky-linux-810-fips-nagios-server nagios[6041]: wproc: Registry request: name=Core Worker 6043;pid=6043 Jan 22 06:09:26 rocky-linux-810-fips-nagios-server nagios[6041]: wproc: Registry request: name=Core Worker 6044;pid=6044 Jan 22 06:09:26 rocky-linux-810-fips-nagios-server nagios[6041]: wproc: Registry request: name=Core Worker 6047;pid=6047 Jan 22 06:09:27 rocky-linux-810-fips-nagios-server nagios[6041]: Successfully launched command file worker with pid 6048

* Started the `nrpe` service:

systemctl start nrpe

* When running the `/usr/lib64/nagios/plugins/check_nrpe -H 127.0.0.1` command, there is no issue there:

/usr/lib64/nagios/plugins/check_nrpe -H 127.0.0.1 NRPE v4.1.2

* Users can be seen on the `Nagios` Client machine:

/usr/lib64/nagios/plugins/check_nrpe -H 10.55.96.4 -c check_users USERS OK - 1 users currently logged in |users=1;5;10;0

* Similarly the load can be seen as well:

/usr/lib64/nagios/plugins/check_nrpe -H 10.55.96.4 -c check_load OK - load average per CPU: 0.01, 0.01, 0.00|load1=0.007;0.150;0.300;0; load5=0.007;0.100;0.250;0; load15=0.000;0.050;0.200;0; ```

Updated: