• Upgraded all packages: 
    dnf upgrade -y
  • I enabled FIPS: 
    fips-mode-setup --enable
  • Rebooted the server: 
    reboot
  • Ensured that FIPS mode was enabled: ``` [root@rocky-linux-810-fips-nagios-server ~]# fips-mode-setup –check

FIPS mode is enabled.

* I then followed the [Nagios Installation Guide](https://support.nagios.com/kb/article/nagios-core-installing-nagios-core-from-source-96.html#RHEL) and ran the following commands:
* Installed the required packages:

dnf install -y gcc glibc glibc-common perl httpd php wget gd gd-devel dnf install -y openssl-devel

* Switched to the `tmp` directory:

cd /tmp

* Pulled the latest source code:

wget –output-document=”nagioscore.tar.gz” $(wget -q -O - https://api.github.com/repos/NagiosEnterprises/nagioscore/releases/latest | grep ‘“browser_download_url”:’ | grep -o ‘https://[^”]*’)

* Ran `tar -xzf` on the file:

tar xzf nagioscore.tar.gz

* Changed into the `cd /tmp/nagios-*` directory:

cd /tmp/nagios-*

* Compiled it successfully:

./configure make all

* Created the `nagios` user and group:

[root@rocky-linux-810-fips-nagios-server nagios-4.5.9]# make install-groups-users groupadd -r nagios useradd -g nagios nagios

* Added the `apache` user to the `nagios` group:

usermod -a -G nagios apache

* Installed all binaries:

make install

* Installed the `nagios` Daemon and enabled the `httpd.service`:

make install-daemoninit systemctl enable httpd.service

* Installed Command Mode:

make install-commandmode

* Installed Configuration files:

make install-config

* Installed the Apache Web Server files:

make install-webconf

* I disabled `firewalld`, similarly to what you had performed on your system:

systemctl disable –now firewalld

* I disabled `SELinux`:

setenforce 0 sed -i ‘s/SELINUX=enforcing/SELINUX=permissive/’ /etc/selinux/config

* Created the `nagiosadmin` account:

htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin


* For the `Nagios` `nagios.cfg` file configuration, I went through the [Nagios Core configuration documentation in full](https://assets.nagios.com/downloads/nagioscore/docs/nagioscore/3/en/configmain.html) and
* My log file was stored under `/usr/local/nagios/var/nagios.log`
* I did not observe any changes of note aside from added object configuration commands in your `nagios.cfg` file, so I have not modified this file.
* I verified my configuration using `/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg` and observed no Warnings or Errors:

Total Warnings: 0 Total Errors: 0

Things look okay - No serious problems were detected during the pre-flight check

* Similarly under `/etc/httpd/conf.d/nagios.conf`, I did not see any major changes required with your config file and have not changed it.

* Started the `httpd` service:

systemctl enable –now httpd.service

* Started the `Nagios` service:

systemctl enable –now nagios.service

* I set up a GUI on the `Nagios` server so I could easily access the `Nagios Web Interface`:

dnf group install -y “Server with GUI” systemctl set-default graphical reboot

* After opening `Firefox`, I was able to navigate to `localhost/nagios` and successfully log in using my `nagiosadmin` credentials.

* For the `Nagios` plugin installation, I followed these steps:
* Installed the required packages:

dnf install -y gcc glibc glibc-common make gettext automake autoconf wget openssl-devel net-snmp net-snmp-utils

* Changed into the `/tmp` directory:

cd /tmp

* Downloaded the plugins tarball:

wget –output-document=”nagios-plugins.tar.gz” $(wget -q -O - https://api.github.com/repos/nagios-plugins/nagios-plugins/releases/latest | grep ‘“browser_download_url”:’ | grep -o ‘https://[^”]*’)

* Ran `tar -zxf` on the tarball:

tar zxf nagios-plugins.tar.gz

* I changed into the directory:

cd /tmp/nagios-plugins-*

* Successfully installed the packages with:

./configure make make install

* Confirmed the plugins were available at `/usr/local/nagios/libexec/`:

[root@rocky-linux-810-fips-nagios-server nagios-plugins-2.4.12]# ls -l /usr/local/nagios/libexec/ | wc -l 65

* Pulled down the latest version of the `nrpe` plugin:

wget https://github.com/NagiosEnterprises/nrpe/releases/download/nrpe-4.1.3/nrpe-4.1.3.tar.gz

* Ran `tar -zxf`:

tar -zxf ./nrpe-4.1.3.tar.gz

* Changed directories:

cd nrpe-4.1.3/

* Compiled and installed `nrpe`:

./configure make all

* Installed the plugin daemon and the sample config files:

make install-plugin make install-daemon make install-init

* Checked that the `Nagios` Server could connect to the Client:

/usr/local/nagios/libexec/check_nrpe -H 10.25.96.4

* This was successful and I could connect to the non-FIPS node from the FIPS node:

[root@rocky-linux-810-fips-nagios-server nrpe-4.1.3]# /usr/local/nagios/libexec/check_nrpe -H 10.25.96.4 NRPE v4.1.3

[root@rocky-linux-810-fips-nagios-server nrpe-4.1.3]# /usr/local/nagios/libexec/check_nrpe -H 10.25.96.4 -c check_users USERS OK - 1 users currently logged in |users=1;5;10;0

[root@rocky-linux-810-fips-nagios-server nrpe-4.1.3]# /usr/local/nagios/libexec/check_nrpe -H 10.25.96.4 -c check_load OK - load average per CPU: 0.00, 0.00, 0.00|load1=0.000;0.150;0.300;0; load5=0.000;0.100;0.250;0; load15=0.000;0.050;0.200;0; [root@rocky-linux-810-fips-nagios-server nrpe-4.1.3]# ```

Updated: