• Continuing with docker lesson at https://www.youtube.com/watch?v=9zUHg7xjIqQ&t=1596s

• You don’t even need to copy node_modules over to your docker image. Remember to use a .dockerignore as basic one looks like this:

node_modules
Dockerfile
.dockerignore
.git
.gitignore

• If we want to use docker for local dev, changes don’t come to get synced magically. a new image needs to be rebuilt and run every time. A workaround for this is to use a bind mount volume. The full cmd would look something like:

docker run -v <full-path-from-host>:<docker-path> -p 1234:3000 -d --name node-app node-app-image

• if we want the bind mount to be read-only we can use ro

-v <full-path-from-host>:<docker-path>:ro . this means docker cant create new files on the host machine.

• To use environment variables set by a user we can use the $ syntax in our Dockerfile

EXPOSE $PORT

This mean can use the following cli flag when running the container `docker run -env PORT=<PORT-number>`

docker-basics