Stackfiles for your serviceEstimated reading time: 2 minutes
What are stack files?
A stack is a logical grouping of related services that are usually deployed together and require each other to work as intended. If you are familiar with fig or Docker Compose then you should feel right at home with stacks. You can learn more about stacks here.
Service definitions in the stack file
The services that you created in this tutorial form a stack with three services: the load-balancer, the web application, and the redis cache.
Look at the file called
docker-cloud.yml in your quickstart to see the stack
file that defines the three services (lb, web, redis) you created in the
previous steps, including all modifications and environment variables.
This is what the
docker-cloud.yml file looks like. (If you are using the
quickstart-go version, you see
quickstart-go instead of
lb: image: dockercloud/haproxy autorestart: always links: - web ports: - "80:80" roles: - global web: image: dockercloud/quickstart-python autorestart: always links: - redis environment: - NAME=Friendly Users deployment_strategy: high_availability target_num_containers: 4 redis: image: redis autorestart: always environment: - REDIS_PASS=password - REDIS_APPENDONLY=yes - REDIS_APPENDFSYNC=always
You can use this stack file to quickly deploy this cluster of three services to another set of nodes. You can also edit the file to change the configuration.
Run a stack
To create the services in a stack file you use the simple
stack up command.
You can run this in the path containing your stackfile (docker-cloud.yml), like so:
$ docker-cloud stack up
Or you can specify the YML file to use and its location:
$ docker-cloud up -f /usr/dockercloud/quickstart-python/docker-cloud.yml
Next, we do some data management with volumes.Python, service, stack