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--- communitycloud:services:monitoring [2012/09/08 12:36]
tkilla created
+++ communitycloud:services:monitoring [2017/09/23 04:09] (current)
tkilla [Plugins]
@@ Line 3: / Line 3: @@
   * munin graphs
   * monit service check & alarm system
+===== monit =====
+syntax is a bit tricky, but it is a reliable system..
+TBD
+monit mailq via external script: https://lists.nongnu.org/archive/html/monit-general/2015-01/msg00015.html
 ===== munin =====
@@ Line 8: / Line 18: @@
 "Munin is a networked resource monitoring tool that can help analyze resource trends and "what just happened to kill our performance?" problems"... http://munin-monitoring.org/
-...tbd... FIXME
+  * "munin" is the central server - run as cronjob every 5 min
-\\
+  * "munin-node" is a client - run as service
-\\
+**Configuration:**
+http://munin-monitoring.org/wiki/munin-node-configure
+**Plugin base setup:**
+  munin-node-configure --suggest   # test
+  munin-node-configure --shell     # install symlinks
+**Test a plugin:**
+  munin-run <plugin-name>
+**Test Server connection:**
+It should reply with the same hostname as setup in munin.conf. If not, edit munin-node.conf host_name on client
+  telnet <ip or localhost> <port>   # default port is 4949
+**Debug:**
+http://munin-monitoring.org/wiki/FAQ_no_graphs
 ==== access munin-nodes via SSH tunnel ====
@@ Line 17: / Line 52: @@
 run this on the node:
-  ssh -L 4950:localhost:4949 -f -N -p22 root@10.23.0.2
+  ssh -L 4950:localhost:4949 -f -N -p22 -M -S /var/run/ssh_tunnel_xs.sock -o ExitOnForwardFailure=yes root@10.23.0.2
-this tunnels munin port 4949 on the node to port 4950 on the master
+this tunnels munin port 4949 on the node to port 4950 on the master, using a socket to be able to stop the tunnel:
-FIXME autossh would be better to keep the connection, but this doesnt work:
+  ssh -S /var/run/ssh_tunnel_xs.sock -O exit root@10.23.0.2
-  autossh -M 4951 -N -R 4949:localhost:4950 -p22 root@10.23.0.2
+SSH tunnel init script to autostart on boot: {{:communitycloud:services:sshtunnel.sh|}}
+\\
+autossh would be better to keep the connection, but this doesnt work: FIXME
+  autossh -M 4951 -N -R 4949:localhost:4950 -p22 root@10.23.0.2
+\\
 edit **/etc/munin/munin.conf** to access the node on localhost:
@@ Line 40: / Line 82: @@
 more info: http://munin-monitoring.org/wiki/faq#Q:HowcanIuseanSSHtunneltoconnecttoanode
+==== Plugins ====
+=== smart ===
+  ln -s /usr/share/munin/plugins/smart_ /etc/munin/plugins/smart_sda
+  ln -s /usr/share/munin/plugins/smart_ /etc/munin/plugins/smart_sdb
+=== nginx ===
+http://localhost/nginx_status required for nginx plugin
+  ln -s /usr/share/munin/plugins/nginx_* /etc/munin/plugins/
+nginx vhost /sites-available/local:
+  server {
+    listen   127.0.0.1:80;
+    access_log off;
+    server_name _;
+    server_name_in_redirect off;
+    root  /home/local;
+    # nginx_status configuration, need for Munin
+    location /nginx_status {
+        stub_status on;
+        access_log   off;
+        allow 127.0.0.1;
+        deny all;
+    }
+    location / {
+        return 301 http://<domain>$request_uri;
+    }
+  }
+required packages:
+  apt-get install  libio-all-lwp-perl
+/etc/munin/plugin-conf.d/munin-node:
+  [nginx*]
+   env.url http://127.0.0.1/nginx_status
+=== apache ===
+needs the apache status page
+config:
+  [apache]
+   env.url   http://127.0.0.1:%d/server-status?auto
+   env.ports 80
+packages:
+  apt install libwww-perl
+symlinks:
+  ln -s /usr/share/munin/plugins/apache_* /etc/munin/plugins/
+=== mysql / mariadb ===
+mysql user required:
+  CREATE USER 'munin'@'localhost' IDENTIFIED BY 'PASSWD_HERE';
+  GRANT PROCESS, REPLICATION CLIENT ON *.* TO 'munin'@'localhost';
+  apt-get install libcache-{perl,cache-perl} libdbd-mysql-perl
+/etc/munin/plugin-conf.d/munin-node:
+  [mysql*]
+   env.mysqlconnection DBI:mysql:information_schema;host=127.0.0.1;port=3306
+   env.mysqluser munin
+   env.mysqlpassword PASSWD_HERE
+   env.cachenamespace munin_mysql_pri
+   # for myisam / queries..:
+   env.mysqlopts -h localhost -u munin --password=PASSWD_HERE
+enable replication graph:
+  ln -s /usr/share/munin/plugins/mysql_ /etc/munin/plugins/mysql_replication
+bugfix: https://github.com/munin-monitoring/munin/pull/109/
+=== php-fpm ===
+https://github.com/MorbZ/munin-php-fpm
+follow install howto
+=== http wget website loadtime ===
+  ln -s /usr/share/munin/plugins/http_loadtime /etc/munin/plugins/
+/etc/munin/plugin-conf.d/munin-node:
+  [http_loadtime]
+  env.target https://<domain>/
+=== processes ===
+just name the symlink like the program you want to monitor (e.g. rsync):
+  ln -s /usr/share/munin/plugins/ps_ /etc/munin/plugins/ps_rsync
+----
+=== todo ===
+very good list and setup of plugins: http://kevin.deldycke.com/2011/06/munin-monitor-debian-squeeze-server/
+nginx access by project
+log analyser:  https://github.com/munin-monitoring/contrib/blob/master/plugins/nginx/nginx_byprojects/byprojects_access
+  * needs logtail
+  * access.logs must be configured in /usr/share/munin/plugins/nginx_byprojects_access
+  * FIXME: doesn't work
+Alerts:
+Do not work..for me.. yet..:
+  * https://www.linuxquestions.org/questions/linux-software-2/munin-changing-cpu-notify-threshold-606308/
+  * http://blog-en.openalfa.com/how-to-configure-alerts-in-munin

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