Deploy an app from the UIEstimated reading time: 4 minutes
With Docker Universal Control Plane you can deploy applications from the UI
docker-compose.yml files. In this example, we’re going to deploy an
application that allows users to vote on whether they prefer cats or dogs. 😺 🐶
Deploy the voting application
The application we’re going to deploy is composed of several services:
vote: The web application that presents the voting interface via port 5000
result: A web application that displays the voting results via port 5001
visualizer: A web application that shows a map of the deployment of the various services across the available nodes via port 8080
redis: Collects raw voting data and stores it in a key/value queue
db: A PostgreSQL service which provides permanent storage on a host volume
worker: A background service that transfers votes from the queue to permanent storage
In your browser, log in to the UCP web UI, and navigate to the Stacks page. Click Create Stack to deploy a new application.
Give the application a name, like “VotingApp”, and in the Mode field, select Services.
Paste the following YAML into the COMPOSE.YML editor.
version: "3" services: redis: image: redis:alpine ports: - "6379" networks: - frontend deploy: replicas: 2 update_config: parallelism: 2 delay: 10s restart_policy: condition: on-failure db: image: postgres:9.4 volumes: - db-data:/var/lib/postgresql/data networks: - backend deploy: placement: constraints: [node.role == manager] vote: image: manomarks/examplevotingapp_vote ports: - 5000:80 networks: - frontend depends_on: - redis deploy: replicas: 6 update_config: parallelism: 2 restart_policy: condition: on-failure result: image: manomarks/examplevotingapp_result ports: - 5001:80 networks: - backend deploy: replicas: 2 update_config: parallelism: 2 delay: 10s restart_policy: condition: on-failure worker: image: manomarks/examplevotingapp_worker networks: - frontend - backend deploy: mode: replicated replicas: 2 labels: [APP=VOTING] restart_policy: condition: on-failure delay: 10s max_attempts: 3 window: 120s placement: constraints: [node.role == worker] visualizer: image: manomarks/visualizer ports: - "8080:8080" stop_grace_period: 1m30s volumes: - "/var/run/docker.sock:/var/run/docker.sock" networks: frontend: backend: volumes: db-data:
When “Services” is selected, you can define services in this YAML file that have a
deploy:key, which schedules the containers on certain nodes, defines their restart behavior, configures the number of replicas, and so on. These features are provided by the Compose V3 file format. Learn about Compose files.
Click Create to build and deploy the application. When you see the Created successfully message, click Done.
In the left pane, click Services to see the details of the services that
you deployed across your nodes. Click the
VotingApp_vote service and find
the Published Endpoint field in the details pane. Click the link to visit
the voting page, which is published on port
Click Cats and Dogs a few times to register some votes, and notice that each click is processed by a different container.
Go back to the Services page in the UCP web UI. Click the
VotingApp_result service and find the Published Endpoint field in
the details pane. It has the same URL as the other
but it’s published on port
5001. Click the link to view the vote tally.
Back in the Services page, click the
VotingApp_visualizer service and find the Published Endpoint field in
the details pane. You’ll see a link to your UCP instance’s URL that includes
the published port of the visualizer service, which is 8080 in this case.
Visiting this URL accesses the running instance of the
service in your browser, which shows a map of how this application was deployed:
You can see some of the characteristics of the deployment specification
from the Compose file in play. For example, the manager node is running the
PostgreSQL container, as configured by setting
[node.role == manager] as a
constraint in the
deploy key for the
There are some limitations when deploying docker-compose.yml applications from the UI. You can’t reference any external files, so the following Docker Compose keywords are not supported:
To overcome these limitations, you can deploy your apps from the CLI.
Also, UCP doesn’t store the compose file used to deploy the application. You can use your version control system to persist that file.