Swarm Mode
Doco-CD also supports Docker Swarm mode, which allows you to manage a cluster of Docker engines as a single virtual engine. This is useful for deploying applications across multiple nodes and ensuring high availability.
If the Docker daemon is running in Swarm mode, doco-cd will detect this automatically and deploy everything as Swarm stacks instead of simple Compose projects.
You can overwrite this to always deploy as Compose projects while running doco-cd in a Swarm environment by setting the DOCKER_SWARM_FEATURES environment variable to false (See the Docker-specific App Settings).
The deployment happens the same way as with Docker Compose projects, see the Deploy Settings
When deploying configs or secrets in Swarm mode, doco-cd will add a suffix to the name of configs and secrets. This suffix is a shortened sha256 hash of the config or secret content, which allows doco-cd to rotate them if their contents change. After rotating, doco-cd will also clean up old versions of the configs or secrets to prevent clutter.
For example, if you deploy a stack named myapp with a config named db-settings and the content of the config is hello world, doco-cd will create a config named myapp_db-settings_a948904f in the Swarm cluster.
If you later change the content of the config to hello universe, doco-cd will create a new config named myapp_db-settings_0b5c6934, redeploy the service/container with the new config and remove the old config myapp_db-settings_a948904f from the Swarm cluster.
