registry-monitor

Simple go application that monitors a Docker registry by conducting pushes and pulls and reports the status to an HTTP endpoint.

Running the monitor

To run the monitor, execute the following command with the flag values replaced:

Flag Name	Description
username	The registry username for auth
password	The registry password for auth
registry-host	The registry hostname. Example: quay.io
repository	The full name of the repository. Example: quay.io/some/repository
base-image-id	The Docker V1 ID of an image in the repository to use as the base

./registry-monitor -username=USERNAME -password=PASSWORD -registry-host=REGISTRYHOST -repository=registryname/some/repository -base-layer-id=DOCKERV1ID

The monitor can also be run itself via Docker:

docker run --privileged -e UNDER_DOCKER=true -v /var/run/docker.sock:/var/run/docker.sock -p 8000:8000 registry-monitor -username=USERNAME -password=PASSWORD -registry-host=REGISTRYHOST -repository=registryname/some/repository -base-layer-id=DOCKERV1ID

Docker Example:

docker run --privileged -e UNDER_DOCKER=true -v /var/run/docker.sock:/var/run/docker.sock -p 8000:8000 registry-monitor -username=myuser+robot -password=myrobottoken -registry-host=quay.io -repository=quay.io/myuser/monitorrepo -base-layer-id=4f83eba78c

Reading the monitor

The monitor exposes three HTTP endpoints on port 8000:

/status returns 200 OK if the pull and push has succeeded within the last monitoring period. /health returns 200 OK if the monitor binary itself is healthy. If non-200, the binary should be terminated and restarted. /metrics returns a Prometheus metrics endpoint for retrieving the results of the monitor.