How to use Docker Compose files without the docker-compose command

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Learn how you should use docker-compose.yml recordsdata with out the docker-compose command.

The way to use Docker Compose recordsdata with out the docker-compose command
Learn how you should use docker-compose.yml recordsdata with out the docker-compose command.

Containers have grow to be an integral software in enterprise expertise. However for these new to containers, it may be a bit complicated. That is very true while you understand what number of completely different strategies there are to deploying such apps and providers onto your community. 

Do you utilize Docker, Docker Compose, or Kubernetes? What when you’ve opted to go the extra versatile Docker Compose route, however do not need to set up the docker-compose command? Or possibly you’ve got plenty of recordsdata constructed for Docker Compose, however need to run them with Docker?

SEE: 10 issues corporations are conserving in their very own information facilities (TechRepublic obtain)

You may. Because of the docker stack command it’s attainable to utilize these docker-compose.yml recordsdata, to deploy a full stack of containers to your already-running Docker Swarm cluster, with solely Docker put in. Which means you’ve got a selection between utilizing a Dockerfile or docker-compose.yml file for the deployment of your container stacks.

However how do you do that? Let me present you.

What you will want

The one belongings you’ll have to make this work are:

  • A working set up of Docker
  • A deployed docker swarm cluster
  • A docker-compose.yml file to make use of

To learn how to deploy a Docker Swarm, learn
The way to create a Docker swarm
.

A fast caveat

Earlier than you dive in, there’s one caveat you must find out about first. Utilizing the docker stack command will fail in case your docker-compose.yml file depends upon a Dockerfile to construct a picture. Such a docker-compose.yml part would possibly seem like:

net:
     construct: .
     ports:
     - "8080:80"

The above will fail. As an alternative, you’d must declare this part like so:

net:
     picture: nginx
     ports:
     - "8080:80"

Our pattern YML file

For the needs of this demonstration, we’ll reuse the file from the “The way to construct a Docker Compose file” article (minus the construct part). So our docker-compose.yml file will seem like this:

Model: 'three'
providers:
  net:
    picture: nginx
    ports:
     - "8080:80"
  db:
    picture: mysql
    ports:
    - "3336:3306"
    surroundings:
    - MYSQL_ROOT_PASSWORD=password
    - MYSQL_USER=person
    - MYSQL_PASSWORD=password
    - MYSQL_DATABASE=demodb

You may change any of the MYSQL variables to fit your wants. We’ll save that file in a listing referred to as ~/dockerbuild. 

Deploy with docker stack

That docker-compose.yml file may very well be deployed utilizing the docker-compose up command. Nonetheless, we’ll do the identical factor with the docker stack command. We’ll identify our stack nginxdb, so the command to deploy can be:

docker stack deploy -c docker-compose.yml nginxdb

The breakdown of the command is:

  • docker stack is the primary command.
  • deploy signifies we’re deploying the stack.
  • -c signifies that what follows is the configuration file for use.
  • docker-compose.yml is the configuration file.
  • nginxdb is the identify of the stack to be deployed.

The command ought to report again the next:

Creating service nginx_web
Creating service nginx_db

If we problem the command docker ps -a we will see that our two containers have been deployed (Determine A).

Determine A

dockerstacka.jpg

One factor to know is that, with docker-compose, you’ve got easy accessibility to bringing down these containers with:

docker-compose down

Since we’re in Docker Swarm mode, to cease a container, you should scale it right down to zero. To do that, you should know the identify of the container, utilizing docker ps -a after which scale it down with the command:

docker service scale NAME=zero

The place NAME is the identify of the working container(s) to be stopped.

And that is the gist of utilizing a docker-compose.yml file, with out having so as to add docker-compose into the combination. That is simply one other software in your container toolbox. Give docker stack a go and see when you desire it to the docker-compose tackle deploying containers.

Additionally see

dockerhero.jpgdockerhero.jpg

Picture: Docker

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