glorpen-docker-exporter 1.0.0

Description:

glorpendockerexporter 1.0.0

Prometheus Docker Exporter
Exports stats from Docker API (/containers/<id>/stat endpoint).
Metrics are collected on each request, everything in single thread.
Fetching stats from Docker API for lots of containers on a small machine could take few seconds,
but this implementation will not use host CPU excessively (looking at you, cAdvisor!).
Supported metrics

cpu
block i/o (cgroups v2)
memory
network

Usage
usage: glorpen-docker-exporter [-h] [-a ADDR] [-p PORT] [--sysfs SYSFS]

options:
-h, --help show this help message and exit
-a ADDR, --addr ADDR address to lsiten on, defaults to 0.0.0.0
-p PORT, --port PORT port to listen on, defaults to 8080
--sysfs SYSFS, -s SYSFS
path to sysfs to use, defaults to /sys

Access to /sys is needed for resolving block device names (/sys/dev/block).
Exporter needs r/w access to Docker socket (eg. /run/docker.sock).
Supported Docker envs:

DOCKER_HOST: The URL to the Docker host.
DOCKER_TLS_VERIFY: Verify the host against a CA certificate.
DOCKER_CERT_PATH: A path to a directory containing TLS certificates to use when connecting to the Docker host.

Docker
docker run -v /sys:/sys:ro -v /run/docker.sock:/run/docker.sock:rw glorpen/prometheus-docker-exporter:1.0.0

Pypi
pip install glorpen-docker-exporter
python -m glorpen-docker-exporter

Example Prometheus queries
CPU usage per container (as in docker stat command):
delta(container_cpu_seconds_total[2m]) / delta(container_cpu_system_seconds_total[2m]) * avg_over_time(container_cpu_online[2m])

Container HDD reads and writes:
rate(container_blkio_reads_bytes_total[2m]) > 0
rate(container_blkio_writes_bytes_total[2m]) > 0