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Setup for voting app example
multi-container, services, swarm mode, cluster, voting app, docker-stack.yml, docker stack deploy
Deploy the application

In these steps, you'll use the docker-stack.yml file to deploy the voting application to the swarm you just created.

Copy docker-stack.yml to the manager

The docker-stack.yml file must be located on a manager for the swarm where you want to deploy the application stack.

  1. Get the docker-stack.ymlfile from the source code in the lab.

    Copy-and-paste the contents of that file into a file of the same name on your host.

    Tip: To avoid text encoding errors from a direct file download, especially on Windows, create the file directly in a Linux environment on your local machine and copy-paste the raw text from the original docker-stack.yml. A file downloaded on a Windows system might include ^M line endings, which will prevent the app from running in the Docker Linux based environment.

  2. Copy docker-stack.yml from your host machine onto the manager.

    $ docker-machine scp ~/sandbox/voting-app/docker-stack.yml manager:/home/docker/.
docker-stack.yml                                                                      100% 1558     1.5KB/s   00:00

  3. Log into the manager node.

    $ docker-machine ssh manager

    The ssh login should put you in /home/docker/ by default.

  4. Check to make sure that the .yml file is there, using ls.

    docker@manager:~$ ls /home/docker/
docker-stack.yml

Deploy the app

We'll deploy the application from the manager.

  1. Deploy the application stack based on the .yml using the command docker stack deploy as follows.

    docker stack deploy --compose-file docker-stack.yml vote

    • The --compose-file option specifies the path to our stack file. In this case, we assume it's in the current directory so we simply name the stack file: docker-stack.yml.

    • For the example, we name this app vote, but we could name it anything we want.

      Here is an example of the command and the output.

    docker@manager:~$ docker stack deploy --compose-file docker-stack.yml vote
Creating network vote_default
Creating network vote_backend
Creating network vote_frontend
Creating service vote_result
Creating service vote_worker
Creating service vote_visualizer
Creating service vote_redis
Creating service vote_db
Creating service vote_vote

  2. Verify that the stack deployed as expected with docker stack services <APP-NAME>.

    docker@manager:~$ docker stack services vote
ID            NAME             MODE        REPLICAS  IMAGE
1zkatkq7sf8n  vote_result      replicated  1/1       dockersamples/examplevotingapp_result:after
hphnxyt93h42  vote_redis       replicated  2/2       redis:alpine
jd0wafumrcil  vote_vote        replicated  2/2       dockersamples/examplevotingapp_vote:after
msief4cqme29  vote_visualizer  replicated  1/1       dockersamples/visualizer:stable
qa6y8sfmtjoz  vote_db          replicated  1/1       postgres:9.4
w04bh1vumnep  vote_worker      replicated  1/1       dockersamples/examplevotingapp_worker:latest

What's next?

In the next steps, we'll view components of the running app on web pages, and take the app for a test drive.