Deploy the app (Engine)

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 docker-stack.yml either from the lab or by copying it from the example given here.

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
   

   You can use vi or cat to inspect the file.

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
   

   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
   0y3q6lgc0drn  vote_result      replicated  2/2       dockersamples/examplevotingapp_result:before
   fvsaqvuec4yw  vote_redis       replicated  2/2       redis:alpine
   igev2xk5s3zo  vote_worker      replicated  1/1       dockersamples/examplevotingapp_worker:latest
   vpfjr9b0qc01  vote_visualizer  replicated  1/1       dockersamples/visualizer:stable
   wctxjnwl22k4  vote_vote        replicated  2/2       dockersamples/examplevotingapp_vote:before
   zp0zyvgaguox  vote_db          replicated  1/1       postgres:9.4
   

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.