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Watchtower provides an HTTP API mode that enables an HTTP endpoint that can be requested to trigger container updating. The current available endpoint list is:
/v1/update- triggers an update for all of the containers monitored by this Watchtower instance.
To enable this mode, use the flag --http-api-update. For example, in a Docker Compose config file:
version: '3'
services:
app-monitored-by-watchtower:
image: myapps/monitored-by-watchtower
labels:
- "com.centurylinklabs.watchtower.enable=true"
watchtower:
image: containrrr/watchtower
volumes:
- /var/run/docker.sock:/var/run/docker.sock
command: --debug --http-api-update
environment:
- WATCHTOWER_HTTP_API_TOKEN=mytoken
labels:
- "com.centurylinklabs.watchtower.enable=false"
ports:
- 8080:8080
By default, enabling this mode prevents periodic polls (i.e. what is specified using --interval or --schedule). To run periodic updates regardless, pass --http-api-periodic-polls.
Notice that there is an environment variable named WATCHTOWER_HTTP_API_TOKEN. To prevent external services from accidentally triggering image updates, all of the requests have to contain a "Token" field, valued as the token defined in WATCHTOWER_HTTP_API_TOKEN, in their headers. In this case, there is a port bind to the host machine, allowing to request localhost:8080 to reach Watchtower. The following curl command would trigger an image update:
curl -H "Authorization: Bearer mytoken" localhost:8080/v1/update
In order to update only certain images, the image names can be provided as URL query parameters. The following curl command would trigger an update for the images foo/bar and foo/baz:
curl -H "Authorization: Bearer mytoken" localhost:8080/v1/update?image=foo/bar,foo/baz