This service runs on CCAO's Shiny server/Ubuntu VM and is responsible for keeping CCAO applications and services up-to-date. It utilizes a small application called Watchtower to scan the CCAO container registry at a set interval and automatically pull new Docker images.
The service will only scan/update images with the Docker label com.centurylinklabs.watchtower.enable=true. This label must be added manually when creating CCAO applications and services. Once an image is updated, any new instances will use the updated version. To force a new session/app update, relaunch the application or service using docker-compose.
To start this service, first connect to the Shiny server via SSH (ask IT for login details). Next, go to the folder containing this repository (usually ~/services/service-watchtower) or clone the repo if it doesn't exist locally. Finally, start the service using Docker Compose by typing docker-compose up -d while in the same folder as docker-compose.yml.
This service requires Docker login details in order to scan the CCAO's private container registry. These details are passed to the service by placing a file, config.json, within a subdirectory of the main repository folder called secrets. The directory structure should be:
service_watchtower
├── docker-compose.yaml
└── secrets
└── config.json
The config.json file is generated using docker login and saved to ~/.docker/config.json by default. Be sure to copy the file into secrets before launching the service with docker-compose up -d.