{ config, lib, pkgs, ... }: # TODO: support munin-async # TODO: LWP/Pg perl libs aren't recognized # TODO: support fastcgi # http://munin-monitoring.org/wiki/CgiHowto2 # spawn-fcgi -s /var/run/munin/fastcgi-graph.sock -U www-data -u munin -g munin /usr/lib/munin/cgi/munin-cgi-graph # spawn-fcgi -s /var/run/munin/fastcgi-html.sock -U www-data -u munin -g munin /usr/lib/munin/cgi/munin-cgi-html # https://paste.sh/vofcctHP#-KbDSXVeWoifYncZmLfZzgum # nginx http://munin.readthedocs.org/en/latest/example/webserver/nginx.html with lib; let nodeCfg = config.services.munin-node; cronCfg = config.services.munin-cron; muninPlugins = pkgs.stdenv.mkDerivation { name = "munin-available-plugins"; buildCommand = '' mkdir -p $out cp --preserve=mode ${pkgs.munin}/lib/plugins/* $out/ for file in $out/*; do case "$file" in plugin.sh) continue;; esac # read magic makers from the file family=$(sed -nr 's/.*#%#\s+family\s*=\s*(\S+)\s*/\1/p' $file) cap=$(sed -nr 's/.*#%#\s+capabilities\s*=\s*(.+)/\1/p' $file) wrapProgram $file \ --set PATH "/run/current-system/sw/bin:/run/current-system/sw/sbin" \ --set MUNIN_LIBDIR "${pkgs.munin}/lib" \ --set MUNIN_PLUGSTATE "/var/run/munin" # munin uses markers to tell munin-node-configure what a plugin can do echo "#%# family=$family" >> $file echo "#%# capabilities=$cap" >> $file done # NOTE: we disable disktstats because plugin seems to fail and it hangs html generation (100% CPU + memory leak) rm -f $out/diskstats ''; buildInputs = [ pkgs.makeWrapper ]; }; muninConf = pkgs.writeText "munin.conf" '' dbdir /var/lib/munin htmldir /var/www/munin logdir /var/log/munin rundir /var/run/munin ${cronCfg.extraGlobalConfig} ${cronCfg.hosts} ''; nodeConf = pkgs.writeText "munin-node.conf" '' log_level 3 log_file Sys::Syslog port 4949 host * background 0 user root group root host_name ${config.networking.hostName} setsid 0 # wrapped plugins by makeWrapper being with dots ignore_file ^\. allow ^127\.0\.0\.1$ ${nodeCfg.extraConfig} ''; in { options = { services.munin-node = { enable = mkOption { default = false; description = '' Enable Munin Node agent. Munin node listens on 0.0.0.0 and by default accepts connections only from 127.0.0.1 for security reasons. See . ''; }; extraConfig = mkOption { default = ""; description = '' munin-node.conf extra configuration. See ''; }; # TODO: add option to add additional plugins }; services.munin-cron = { enable = mkOption { default = false; description = '' Enable munin-cron. Takes care of all heavy lifting to collect data from nodes and draws graphs to html. Runs munin-update, munin-limits, munin-graphs and munin-html in that order. HTML output is in /var/www/munin/, configure your favourite webserver to serve static files. ''; example = literalExample '' services = { munin-node.enable = true; munin-cron = { enable = true; hosts = ''' [''${config.networking.hostName}] address localhost '''; extraGlobalConfig = ''' contact.email.command mail -s "Munin notification for ''${var:host}" someone@example.com '''; }; }; ''; }; extraGlobalConfig = mkOption { default = ""; description = '' munin.conf extra global configuration. See . Useful to setup notifications, see ''; }; hosts = mkOption { example = '' [''${config.networking.hostName}] address localhost ''; description = '' Definitions of hosts of nodes to collect data from. Needs at least one hosts for cron to succeed. See ''; }; }; }; config = mkMerge [ (mkIf (nodeCfg.enable || cronCfg.enable) { environment.systemPackages = [ pkgs.munin ]; users.extraUsers = [{ name = "munin"; description = "Munin monitoring user"; group = "munin"; uid = config.ids.uids.munin; }]; users.extraGroups = [{ name = "munin"; gid = config.ids.gids.munin; }]; }) (mkIf nodeCfg.enable { systemd.services.munin-node = { description = "Munin Node"; after = [ "network.target" ]; wantedBy = [ "multi-user.target" ]; path = [ pkgs.munin ]; environment.MUNIN_PLUGSTATE = "/var/run/munin"; preStart = '' echo "updating munin plugins..." mkdir -p /etc/munin/plugins rm -rf /etc/munin/plugins/* PATH="/run/current-system/sw/bin:/run/current-system/sw/sbin" ${pkgs.munin}/sbin/munin-node-configure --shell --families contrib,auto,manual --config ${nodeConf} --libdir=${muninPlugins} --servicedir=/etc/munin/plugins 2>/dev/null | ${pkgs.bash}/bin/bash ''; serviceConfig = { ExecStart = "${pkgs.munin}/sbin/munin-node --config ${nodeConf} --servicedir /etc/munin/plugins/"; }; }; }) (mkIf cronCfg.enable { services.cron.systemCronJobs = [ "*/5 * * * * munin ${pkgs.munin}/bin/munin-cron --config ${muninConf}" ]; system.activationScripts.munin-cron = stringAfter [ "users" "groups" ] '' mkdir -p /var/{run,log,www,lib}/munin chown -R munin:munin /var/{run,log,www,lib}/munin ''; })]; }