Munin dynazoom graphs with nginx and spawn-fcgi

munin-fcgi.service

[Unit]
Description=Munin FCGI
After=network.target

[Service]
Type=forking
PIDFile=/var/run/munin/fcgi-graph.pid
Restart=always

ExecStartPre=/bin/mkdir -p /var/lib/munin/cgi-tmp/munin-cgi-graph
ExecStartPre=/bin/chown www-data:munin /var/lib/munin/cgi-tmp/munin-cgi-graph

ExecStart=/usr/bin/spawn-fcgi \
  -s /var/run/munin/fcgi-graph.sock \
  -P /var/run/munin/fcgi-graph.pid \
  -U www-data -u www-data -g munin -M 0660 \
  -- /usr/lib/munin/cgi/munin-cgi-graph

[Install]
WantedBy=multi-user.target

nginx.conf

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:/var/run/munin/fcgi-graph.sock;
    include fastcgi_params;
}