Custom Datadog Synthetics Private Location Worker Docker image

README.md

Custom Datadog Synthetics Private Location Worker Docker image

https://docs.datadoghq.com/synthetics/private_locations/?tab=docker

Why a custom image?

The datadog/synthetics-private-location-worker Docker image doesn't allow to set check runner's JSON config using environment variables, but only by mounting a JSON config file as a Docker volume.

This custom image uses an entrypoint script that allows you to set the check runner's JSON config by passing it as an environment variable (SYNTHETICS_CHECK_RUNNER_CONFIG_JSON).

Private location worker usage/config options remain unchanged.

$ docker build -t custom-synthetics-image .
$ docker run --rm -it -e SYNTHETICS_CHECK_RUNNER_CONFIG_JSON="__JSON_CONFIG__" custom-synthetics-image --help

Dockerfile

FROM datadog/synthetics-private-location-worker:1.0.1

COPY entrypoint.sh /home/dog/custom-entrypoint.sh

ENTRYPOINT ["/home/dog/custom-entrypoint.sh"]

entrypoint.sh

#!/bin/bash

set -o errexit
set -o nounset

SYNTHETICS_CHECK_RUNNER_CONFIG_JSON=${SYNTHETICS_CHECK_RUNNER_CONFIG_JSON:-}

if [ -z "$SYNTHETICS_CHECK_RUNNER_CONFIG_JSON" ]; then
  >&2 echo "SYNTHETICS_CHECK_RUNNER_CONFIG_JSON environment variable is not set!"
  exit 1
fi

# default synthetics-check-runner config path
echo -n "$SYNTHETICS_CHECK_RUNNER_CONFIG_JSON" > /etc/datadog/synthetics-check-runner.json

# default synthetics-check-runner entrypoint
/home/dog/entrypoint.sh "$@"