Database monitoring#

To monitor databases in NGN Cloud, we recommend enabling cloud Prometheus-based monitoring service. If you have your own Prometheus- or Zabbix-based monitoring server, you can connect PaaS services to it.

Databases in NGN Cloud are deployed with monitoring agents already installed. Exporters from the Prometheus project ecosystem are used as agents. Each of them runs in the background mode and listens to a specific port. You can make an HTTP GET request to the port at any time to get the metrics.

Exporter	PaaS	Metrics	Metric collection point	Description
node_exporter	All services	Host properties, OS metrics, utilization of system resources	http://<IP>:9100/metrics	Project page node_exporter
mysqld_exporter	MySQL	Variables and statuses of a running DBMS, full list of MySQL metrics	http://<IP>:9104/metrics	Project page mysqld_exporter
postgres_exporter	PostgreSQL	Metrics of a running DBMS, full list of PostgreSQL metrics	http://<IP>:9187/metrics	Project page postgres_exporter
redis_exporter	Redis	Metrics of a running DBMS, full list of Redis metrics	http://<IP>:9121/metrics	Project page redis_exporter
mongodb_exporter	MongoDB	Metrics of a running DBMS, full list of Mongo DB metrics	http://<IP>:9216/metrics	Project page mongodb_exporter

DBMS listens to addresses and ports can be found in the Information tab.

You can use addresses not only to connect applications to the DBMS but also to connect to monitoring agents.

For example, to get metrics from MySQL that listens to the following addresses:

../../../_images/AdressesMySQL_example.png

you need to use the following cluster endpoints:

And to get metrics from the host and VM OS, you should use the following endpoints:

For a Prometheus server, the configuration for working with such a service might look like this (http:// and /metrics are default values and are not specified in the given configuration for connection points):

scrape_configs:
- job_name: node
  static_configs:
  - targets:
    - 172.31.1.37:9100
    - 172.31.0.55:9100
    - 172.31.2.40:9100
- job_name: mysqld
  static_configs:
  - targets:
    - 172.31.1.37:9104
    - 172.31.0.55:9104
    - 172.31.2.40:9104

Zabbix monitoring server can also use data that exporters provide via integration with the help of their HTTP client; for details, see.