The ungleich monitoring infrastructure » History » Revision 8
Revision 7 (Nico Schottelius, 07/04/2020 09:04 PM) → Revision 8/35 (Nico Schottelius, 07/04/2020 09:05 PM)
h1. The ungleich monitoring infrastructure
{{>toc}}
h2. Introduction
We use the following technology / products for the monitoring:
* consul (service discovery)
* prometheus (exporting, gathering, alerting)
* Grafana (presenting)
Prometheus and grafana are located on the monitoring control machines
* monitoring.place5.ungleich.ch
* monitoring.place6.ungleich.ch
h2. Consul
We use a consul cluster for each datacenter (e.g. place5 and place6).
The servers are located on the physical machines (red{1..3} resp. black{1..3}) and the agents are running on all other monitored machines (such as servers and VMs)
consul is configured to publish the service its host is providing (e.g. the exporters)
There is a inter-datacenter communication (wan gossip) [https://www.consul.io/docs/guides/datacenters.html]
h2. Prometheus
Prometheus is responsible to get all data out (exporters) of the monitored host and store them. Also to send out alerts if needed (alertmanager)
h3. Exporters
* Node (host specific metrics (e.g. CPU-, RAM-, Disk-usage..))
* Ceph (Ceph specific metrics (e.g. pool usage, osds ..))
* blackbox (Metrics about online state of http/https services)
The node exporter is located on all monitored hosts
Ceph exporter is porvided by ceph itself and is located on the ceph manager.
The blackbox exporter is located on the monitoring control machine itself.
h3. Alerts
We configured the following alerts:
* ceph osds down
* ceph health state is not OK
* ceph quorum not OK
* ceph pool disk usage too high
* ceph disk usage too high
* instance down
* disk usage too high
* Monitored website down
h2. Grafana
Grafana provides dashboards for the following:
* Node (metrics about CPU-, RAM-, Disk and so on usage)
* blackbox (metrics about the blackbox exporter)
* ceph (important metrics from the ceph exporter)
h3. Authentication
The grafana authentication works over ldap. (See [[The ungleich LDAP guide]])
All users in the @devops@ group will be mapped to the Admin role, all other users will be Viewers
h2. Monit
We use "monit":https://mmonit.com/ for monitoring and restarting daemons. See `__ungleich_monit` type in dot-cdist.
h2. Misc
* You're probably looking for the `__dcl_monitoring_server` type, which centralize a bunch of stuff.
* This page needs some love!
h2. Service/Customer monitoring
* A few blackbox things can be found on the datacenter monitoring infrastructure.
* There's a new prometheus+grafana setup at https://service-monitoring.ungleich.ch/, deployed by @fnux for Matrix-as-a-Service monitoring. At time of writing, it also monitors the VPN server and staticwebhosting. No alertmanager yet. Partially manual.
h2. Monitoring Guide
h3. Configuring prometheus
Use @promtool check config@ to verify the configuration.
<pre>
[21:02:48] server1.place11:~# promtool check config /etc/prometheus/prometheus.yml
Checking /etc/prometheus/prometheus.yml
SUCCESS: 4 rule files found
Checking /etc/prometheus/blackbox.rules
SUCCESS: 3 rules found
Checking /etc/prometheus/ceph-alerts.rules
SUCCESS: 8 rules found
Checking /etc/prometheus/node-alerts.rules
SUCCESS: 8 rules found
Checking /etc/prometheus/uplink-monitoring.rules
SUCCESS: 1 rules found
</pre>
h3. Querying prometheus
Use @promtool query instant@ to query values:
<pre>
[21:00:26] server1.place11:~# promtool query instant http://localhost:9090 'probe_success{dc="place5"} == 1'
probe_success{dc="place5", instance="193.192.225.73", job="routers-place5", protocol="ipv4", sensiblehostname="router1"} => 1 @[1593889492.577]
probe_success{dc="place5", instance="195.141.230.103", job="routers-place5", protocol="ipv4", sensiblehostname="router2"} => 1 @[1593889492.577]
probe_success{dc="place5", instance="2001:1700:3500::12", job="routers-place5", protocol="ipv6", sensiblehostname="router2"} => 1 @[1593889492.577]
probe_success{dc="place5", instance="2001:1700:3500::2", job="routers-place5", protocol="ipv6", sensiblehostname="router1"} => 1 @[1593889492.577]
</pre>