ctdb_exporter

Prometheus exporter for CTDB

Usage

Usage of ./ctdb_exporter:
-web.listen-address string
The address to listen on for HTTP requests. (default ":9725")
-web.endpoint
The endpoint exposing metrics. (default "/metrics")
-ctdb.bin-path
The complete path to ctdb binary. (default "/usr/bin/ctdb")
-ctdb.sudo
Prefix ctdb commands with sudo. (default true)

Requirements

CTDB
sudo (optional)

Sudo

This tool is most likely going to need sudo as default CTDB configuration locks ctdb.socket access to root only. Assuming you are running the exporter with the user prometheus, the easiest way to handle this would be creating a /etc/sudoers.d/ctdb_exporter file containing :

prometheus ALL=(ALL) NOPASSWD: /usr/bin/ctdb pnn,/usr/bin/ctdb recmaster,/usr/bin/ctdb status -Y,/usr/bin/ctdb statistics -Y

Prometheus configuration

Minimal Prometheus scrape configuration :

scrape_configs:
  - job_name: "ctdb"
    static_configs:
      - targets:
        - samba-01.example.com:9725
        - samba-02.example.com:9725

Exposed metrics

ctdb_up will return 0 on scrape errors.

The results of ctdb status -Y on master node and ctdb statistics -Y on all nodes will be returned as gauges.

Example metrics :

ctdb_up 1
...
ctdb_banned{id="1",ip="0.0.0.1"} 0
ctdb_banned{id="2",ip="0.0.0.2"} 0
ctdb_disconnected{id="1",ip="0.0.0.1"} 0
ctdb_disconnected{id="2",ip="0.0.0.2"} 0
...
ctdb_num_clients{id="1"} 12
ctdb_num_clients{id="2"} 21