How can I use version managers with Docker?

How can I use version managers with Docker?

You can use version managers like nvm or rvm inside Docker containers to manage different versions of Node.js or Ruby.

Can you give me an example Dockerfile using nvm?

Sure! Here's a simple Dockerfile:

FROM ubuntu:20.04

RUN apt-get update && apt-get install -y curl

RUN curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.1/install.sh | bash

ENV NVM_DIR /root/.nvm
RUN ["/bin/bash", "-c", "source $NVM_DIR/nvm.sh && nvm install node"]

This installs nvm and the latest Node.js version.

What if I want to use a specific version of Node.js?

You can specify the version in the Dockerfile like this:

RUN ["/bin/bash", "-c", "source $NVM_DIR/nvm.sh && nvm install 14.17.0"]

This will install Node.js version 14.17.0.

Is it possible to use rvm for Ruby in a similar way?

Yes, you can use rvm in a Dockerfile as well. Just install rvm and specify the Ruby version you want to use.