CODEWITHSUNDEEP
macosdockerpath
Steven Aguilar
Steven Aguilar

Reputation: 3049

Docker /usr/src/app path on Mac OS

I'm currently reading Deploying Rails with Docker, Kubernetes and ECS. In the book a Rails image from Dockerhub is use to create a new application. After running the following command a Rails application is created. 

docker run -it --rm --user "$(id -u):$(id -g)" -v "$PWD":/usr/src/app -w / usr/src/app \
rails rails new --skip-bundle --api --database postgresql webapp

However, Docker needs this path /usr/src/app but this is only on Windows. In Mac OS the folder is /usr/local/ should a app directory be created in local to follow along this path?

Upvotes: 0

Views: 1773

Answers (1)

trust512
trust512

Reputation: 2254

What's inside docker is a totally separate thing from what's happening on your host system. You should leave this "$PWD":/usr/src/app as it is now, because the tutorial will certainly be based on that path.

One word of a note concerning $PWD

It's always easier to read and more consistent if you specify the path directly. Meaning if your project has a directory where all the rails app is setup, you are better off writing such a thing:

[..] -v ./ruby-app-directory:/usr/src/app [..]

or

[..] -v .:/usr/src/app [..]

for example:

$ docker run -it --rm --user "$(id -u):$(id -g)" -v .:/usr/src/app -w / usr/src/app \
rails rails new --skip-bundle --api --database postgresql webapp

than leaving it to the variable.

Example

application tree:

root
  - one-app
    + some.sh
    + Dockerfile
  - second-app
    + some.rails
    + Dockerfile

With above application tree configuration you can use it like this:

$ docker run -it --rm --user "$(id -u):$(id -g)" -v ./second-app:/usr/src/app -w / usr/src/app \
rails rails new --skip-bundle --api --database postgresql webapp

and everything that's inside ./second-app will be placed inside the container in /usr/src/app location (with /usr/src/app as a working directory set up by another argument) so that the command you specify at the end of a docker run command, will be executed in /usr/src/app - the working directory.

Upvotes: 1

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