Docker service registrator for Kong

Manages the upstream target registration in Kong for Docker containers running on this host.

When a container is started, the registrator will create a upstream target for each exposed port of a container which has a matching SERVICE_<exposed-port>_NAME environment variable. If the container exposes a single port, it is sufficient to have a SERVICE_NAME environment variable.

In addition, if the container has an environment variable named KONG_<exposed_port>_API, containing a json string with a Kong API definition it is registered too. If the name and the upstream_url are missing, it will set using the SERVICE_NAME value. If the container exposes a single port, it is sufficient to have a KONG_API variable.

The registrator has three commands: remove-all, sync and daemon.

Daemon mode

When the registrator starts in daemon mode it will first do a full sync, to ensure that the upstream targets are actually reflecting docker instances running on this host.

After that, it will process Docker container start and die events to update the upstreams.

Sync

You can run a standalone sync command to ensure that the upstream targets are actually reflecting docker instances running on this host.

Remove all

When the host is shutdown, it is wise to run the remove-all command to upstream targets pointing to this host.

remove-all  - remove all upstream targets pointing to this host, but run on host shutdown
sync        - synchronise the upstream targets with the running containers 
daemon      - continuously update the upstream targets by subscribing to the Docker event stream

you must specify, either the dns name or the Route53 hosted zone id:

  --dns-name TEXT        to append to the service name to create an upstream name, defaults to '.docker.internal'
  --admin_url TEXT       pointing to the Kong admin API, defaults to http://localhost:8001
  --hostname HOSTNAME    to use in targets.