How to Install and Configure Munin Monitoring with Nginx and CGI on CentOS 8

Setting up Munin on CentOS 8 via EPEL 8 provides turnkey server performance graphs. This guide walks through configuring systemd timer units, fastcgi spawners for dynamic graph generation, and integrating the dashboard into an Nginx virtual host.

Packages: munin • munin-node • munin-cgi • spawn-fcgi

1. Installing Packages from EPEL 8

dnf install epel-release -y
dnf install munin munin-cgi munin-node spawn-fcgi nginx -y

2. Enabling Node and Systemd Services

systemctl enable --now munin-node
systemctl enable --now munin-cgi-graph.socket
systemctl enable --now munin-cgi-html.socket

3. Nginx Server Block (/etc/nginx/conf.d/munin.conf)

server {
    listen 80;
    server_name munin.example.com;

    location / {
        root /var/www/html/munin;
        index index.html;
    }

    location ^~ /munin-cgi/munin-cgi-graph/ {
        fastcgi_split_path_info ^(/munin-cgi/munin-cgi-graph)(.*);
        fastcgi_param PATH_INFO $fastcgi_path_info;
        fastcgi_pass unix:/run/munin/fcgi-graph.sock;
        include fastcgi_params;
    }
}