Munin 2.0 introduced dynamic CGI graph and HTML generation, allowing monitoring dashboards to scale efficiently without requiring static graph regeneration during every 5-minute cron cycle. Here is how to compile Munin 2.0 from source and integrate it with Nginx using spawn-fcgi on CentOS 6.
Stack: Munin 2.0.x • Nginx • FastCGI (
spawn-fcgi) • CentOS 6 / RHEL 6
1. Installing Build Dependencies
Install Perl module prerequisites and development tools:
yum groupinstall 'Development Tools' -y
yum install perl-CGI perl-FCGI perl-File-Copy-Recursive perl-Module-Build perl-Cache-Cache git spawn-fcgi -y
groupadd munin
useradd munin -g munin -s /sbin/nologin -d /var/www/html/munin2. Compiling Munin 2.0 from Source
cd /usr/src
git clone git://github.com/munin-monitoring/munin.git
cd munin
git checkout tags/2.0.0
make
make install3. Spawning FastCGI Processes for Graph and HTML Generation
Munin 2.0 relies on two FastCGI workers: one for HTML page rendering and one for real-time RRD graph generation.
spawn-fcgi -s /var/run/munin/fcgi-graph.sock -u munin -g munin -- /var/www/html/munin/cgi/munin-cgi-graph
spawn-fcgi -s /var/run/munin/fcgi-html.sock -u munin -g munin -- /var/www/html/munin/cgi/munin-cgi-html4. Nginx Server Configuration
Configure Nginx to proxy requests to the Munin FastCGI sockets:
location ^~ /cgi-bin/munin-cgi-graph/ {
access_log off;
fastcgi_split_path_info ^(/cgi-bin/munin-cgi-graph)(.*);
fastcgi_param PATH_INFO $fastcgi_path_info;
fastcgi_pass unix:/var/run/munin/fcgi-graph.sock;
include fastcgi_params;
}
location /munin/static/ {
alias /etc/munin/static/;
}
location /munin/ {
fastcgi_split_path_info ^(/munin)(.*);
fastcgi_param PATH_INFO $fastcgi_path_info;
fastcgi_pass unix:/var/run/munin/fcgi-html.sock;
include fastcgi_params;
}5. Testing
Execute the Munin cron job under the munin system user to build the initial state:
sudo -u munin munin-cron
