10/13/2021 0 Comments Docker For Mac Compose Version 3
The latest and recommended version of the Compose file format is defined by the Compose Specification. This is specified with a version: '3' or version: '3.1' , etc., entry at the root of the YAML. Version 3.x, designed to be cross-compatible between Compose and the Docker Engine’s swarm mode.
Docker Compose Version 3 Update On PodmanThe file is named Dockerfile and we'll house it in a new directory called dockerbuild. If you want to know how to use Podman v3.0 to convert Docker Compose YAML to a.So let's say we want to create a Dockerfile that will use the latest NGINX image, but install php and php-fpm. If you use an older version, it can still successfully run on newer versions of Docker.Before we get into this, make sure to read the following pieces:Brent Baude checks in with an update on Podman on macOS and Windows. As of the writing of this post, 3.8 is the latest, which maps to the Docker Engine 19.03.0+.It is in the web section that we instruct the docker-compose command to use the Dockerfile in the same directory (the. This docker-compose.yml file might look like: version: '3'The important section here is web. The docker-compose.yml fileNow let's craft a docker-compose.yml file which uses that Dockerfile, but also adds a database to the stack. But we want to integrate that file into docker-compose.yml. It's an incredibly simple example, but one that's easy to follow.You could then run the docker build command with that Dockerfile, like so: docker build -t "webdev:Dockerfile".Write once, use oftenWith this system, you can write once and use often. Why go through all the trouble of re-defining the NGINX container within docker-compose.yml when you can simply repurpose the Dockerfile. Why? Say you've defined a very complex Dockerfile for an NGINX container and you want to reuse that in a container deployment within a complete stack. You could then deploy the new container with the command (run from within the directory housing the docker-compose.yml file): docker-compose upThe command would first build the NGINX container from the Dockerfile and then deploy the db container as defined in the db: section.Of course, you could also define everything within the docker-compose.yml file, but making use of both Dockerfile and docker-compose.yml makes for a much more flexible and efficient system. Say, for example, the docker-compose.yml file is in ~/dockerbuild and the Dockercompose file is in ~/nginxbuild, you could declare that with the line: build: ~/nginxbuildSave and close the file. If we wanted to house our Dockerfile in a completely separate directory, it would be declared here.Deploy the entire stack with the docker compose command.And that is the fundamental difference between Dockerfile and docker-compse.yml files. Define complex stacks (comprising of individual containers) based on those Dockerfile images from within docker-compose.yml. Remember, docker-compose.yml files are used for defining and running multi-container Docker applications, whereas Dockerfiles are simple text files that contain the commands to assemble an image that will be used to deploy containers.
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