Run a local prometheus with short scraping interval for development purposes

quick-prometheus

#!/bin/bash
set -e

datadir=$1
app_port=$2
metrics_path=${3:-/metrics}

if [[ -z "$datadir" || -z "$app_port" ]]; then
  echo "Usage: $0 DATADIR APPLICATION_PORT [METRICS_PATH]"
  exit 1
fi

mkdir -p $datadir/data

cat >$datadir/prometheus.yml <<EOF
global:
  evaluation_interval: 5s
  scrape_interval: 1s
  scrape_timeout: 1s

scrape_configs:
- job_name: my-application
  metrics_path: ${metrics_path}
  static_configs:
  - targets:
    - host.docker.internal:${app_port}
EOF

if [[ "$OSTYPE" == "linux-gnu"* ]]; then
  EXTRA_ARGS="--add-host=host.docker.internal:127.0.0.1"
fi

DOCKER=docker
if command -v "podman"; then
  DOCKER=podman
fi

exec $DOCKER run \
  -it \
  --rm \
  --publish 9090:9090 \
  --volume $datadir:/etc/prometheus \
  --volume $datadir/data:/prometheus \
  --user root \
  $EXTRA_ARGS \
  prom/prometheus