bahmutov/README.md

## README.md

      
    Raw
  

              README.md
            
          
    Goal: run a simple NodeJS application inside a Docker container

Subgoal: give it access to local files.

docker run -it --rm --name example -v "$PWD":/usr/src/app -w /usr/src/app node:5-slim node index.js

output:
current working directory /usr/src/app
Hello, World!

Unwrapped command line
run - execute the image right away
-i  - inherit STDIO and STDOUT from the current shell process
-t  - execute the command (the command "node index.js" is at the end)
--rm - remove existing running image
--name example - give the running container user friendly name "example"
-v "$PWD":/usr/src/app - mount current directory inside the docker container as a volume, 
                         set its path as "/usr/src/app"
-w /usr/src/app - set the working directory before running the command
node:5-slim - use the "node:5-slim" as the docker base image for our container (small!)
node index.js - the command to run inside the new container


More Docker examples at https://gist.github.com/bahmutov/1003fa86980dda147ff6
Node Docker images at the docker hub


## hello.txt
Hello, World!

## index.js
console.log('current working directory', process.cwd())
var read = require('fs').readFileSync
console.log(read('./hello.txt', 'utf8'))
	console.log('current working directory', process.cwd())
	var read = require('fs').readFileSync
	console.log(read('./hello.txt', 'utf8'))