Docker Node JS set env

Question

How to set node ENV process.env.mysql-host with docker run?

Can i somehow do like this? docker run --mysql-host:127.0.0.1 -p 80:80 -d myApp

I am using FROM node:onbuild as image.

Answer 1

Node's process.env is an object containing the user environment. Docker's CLI allows you to set the environment variable for the container using the -e or --env options.

You can run

docker run --env mysql_host=127.0.0.1 -p 80:80 -d myApp

To pass the mysql_host into the container.

Answer 2

I don't know much about node, but I think you just need to do:

docker run -e mysql-host=127.0.0.1 -p 80:80 -d myApp

Note that this will look for mysql-host in the same container, not on the host, if that's what you're expecting. I think what you really want to do is:

$ docker run -d --name db mysql
...
$ docker run -d --link db:mysql-host -p 80:80 -d myApp

Which will run the myApp container linked to the db container and resolvable as "mysql-host" inside the myApp container with no need for environment variables.