mirror of https://github.com/docker/docs.git
104 lines
4.3 KiB
Markdown
104 lines
4.3 KiB
Markdown
---
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description: Customize the voting app
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keywords: multi-container, services, swarm mode, cluster, voting app, docker-stack.yml, docker stack deploy
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title: Customize the app and redeploy
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---
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In this step, we'll make a simple change to the application and redeploy it.
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We'll change the focus of the poll from Cats or Dogs to .NET or Java.
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In the real world, you might do this by making code changes and rebuilding to
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create new images, or new versions of the same images.
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For our example, we've done this for you. We already have a different version of
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the application available as built images. So, all you need to do is reconfigure
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`docker-stack.yml` to point to the new images, then redeploy.
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## Update docker-stack.yml to reference new images
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Go back to `docker-stack.yml` and replace the `before` tags on both the `vote` and `result` images to reference `after` tags. These new image tags will call different versions of the images.
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## Redeploy
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Run the same deploy command again to run the app with the new configuration.
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```none
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docker stack deploy --compose-file docker-stack.yml vote
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```
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The output will look similar to this:
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```none
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docker@manager:~$ docker stack deploy --compose-file docker-stack.yml vote
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Updating service vote_redis (id: md73fohylg8q85aryz07852o0)
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Updating service vote_db (id: gny9ieqxancnufrg1oeazz9gq)
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Updating service vote_vote (id: 0ig0s4gb10q8auek9tris5i8z)
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Updating service vote_result (id: lqwxjmmdhmegs2aw0a6ehipsp)
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Updating service vote_worker (id: 8u4cfu60dtliz77x1o74kiwpr)
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Updating service vote_visualizer (id: ya2vt9z2b4to248tccjjeqitw)
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```
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## Try it out
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Take the app for another test drive.
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You'll see the new voting choices for Java and .NET at `<MANAGER-IP>:5000`.
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And the related results at `<MANAGER-IP>:5001`.
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The visualizer at `<MANAGER-IP>:8080` will show some differences, such as
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updates to the containers, and some services might have moved between the
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manager and the worker.
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However, the PostgreSQL container (`vote_db`) and the
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visualizer (`vote_visualizer`) will still be running on the manager because of
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the `[node.role == manager]` constraints on those services, which we
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did not change.
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## Resources
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* [Introducing Docker 1.13.0](https://blog.docker.com/2017/01/whats-new-in-docker-1-13/) blog post
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from [Docker Core Engineering](https://blog.docker.com/author/core_eng/)
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* A deeper dive voting app walkthrough is available on
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[Docker Labs](https://github.com/docker/labs/) as [Deploying an app to a Swarm](https://github.com/docker/labs/blob/master/beginner/chapters/votingapp.md).
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The lab walkthrough provides more technical detail on deployment configuration,
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Compose file keys, the application, stack and services concepts, and
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networking.
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* [Source code for the Voting App](https://github.com/docker/example-voting-app) (to go along with the lab walkthrough) is also available on Docker Labs.
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* The images you used are available on [Docker Hub](https://hub.docker.com/). When you ran `docker-stack.yml` you pulled those images from Docker Hub.
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* To learn how to build your own images, see
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[Build your own image](/engine/getstarted/step_four.md) in Get Started with
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Docker and topics on images in [Learn by example](/engine/tutorials/index.md).
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* For more about the `docker-stack.yml` and the `docker stack deploy` commands,
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see [deploy](/compose/compose-file.md#deploy) in the Compose file reference and
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[`docker stack deploy`](/engine/reference/commandline/stack_deploy.md)
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in the Docker Engine command line reference.
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* To learn about all new features in Compose, see
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[Compose file version 3 reference](/compose/compose-file/index.md) and
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[Compose file versions and upgrading](/compose/compose-file/compose-versioning.md).
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* For more about swarm mode, start with the
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[Swarm mode overview](/engine/swarm/index.md).
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* For information about Docker CE and Docker EE, see [Docker Community Edition](https://www.docker.com/community-edition) and [Docker Enterprise Edition](https://www.docker.com/enterprise-edition).
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## What's next?
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* To learn about shutting down the sample app and cleaning up, see [Graceful shutdown, reboot, and clean-up](cleanup.md).
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