Docker Command Line, Using and Choosing containers

Docker on
Command Line
Do you know what command line is?

Docker on Command Line
Command line. The most efficient way to use Docker.
● Your Containers and Images
● Working with a Registry
● Running and executing containers
● Build your own containers
● Container management

Docker Help
All possible commands.
$ docker help run

● Container is a runnable artifact.
● Images are a copy of a filesystem.
● You can run an image inside a container.
You start from someone elses image
and build on top of that!
Your Containers and Images

Working with a Registry
All installs are by default connected to Docker Hub
$ docker pull, commit, push
Git-like commands for working with a container and a registry.
$ docker login

Choosing Containers
● Docker Hub (https://hub.docker.com)
● Smaller = better (generally) - Love Alpine.
● Official containers and non-official containers
● Check out how they are built
You should all star my projects ;-)

Running a container
Run container is to start it.
$ docker run
At this point you would add extra detail to the command to make it
(connect to ports, mount volumes).
$ docker run -p 8080:80 -v $(pwd):/app nginx:alpine

Execute into a running container
Exec to a container is to execute a program inside it.
$ docker exec
Whatever goes after the docker command will try to run on the
system (depending on the endpoint - which we will discuss later).
$ docker -it exec [container] /bin/sh

Build your own images
Using Dockerfile you can build your own images
$ docker build
This is defined and created in layers.
$ docker build -t i-love-containers .

$ vim index.html
PRESS: i (enter [INSERT] mode)
<h1>I LOVE CONTAINERS</h1>
PRESS: [Esc]
Type: :wq
Or write on your local machine and drag into browser window.

$ vim Dockerfile
FROM nginx:latest
COPY ./index.html /usr/share/nginx/html/index.html

$ docker build
$ docker build -t i-love-containers .

$ docker run
$ docker run -p 8082:80 i-love-containers

JavaScript (package.json)
{
"name": "i-love-containers",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "echo "Error: no test specified" && exit 1"
},
"author": "",
"license": "ISC",
"dependencies": {
"express": "^4.16.3"
}
}

JavaScript (index.js)
var express = require('express');
var app = express();
app.get('/', function (req, res) {
res.send('I Love JS Containers!');
});
app.listen(3000, function () {
console.log('Example app listening on port 3000!');
});

Run it
$ docker run -it -p 3000:3000 -v $(pwd):/app node:8-
alpine /bin/sh
$ cd /app
$ npm install
$ node index.js

Dockerfile
FROM node:8-alpine
COPY ./ /app
RUN cd /app && npm install
EXPOSE 3000
CMD ["node", "/app/index.js"]

Build it & Run it
$ docker build -y i-love-js-containers
$ docker run -d -p 3000:3000 i-love-js-containers

CONNECT WITH
ME…
Will Hall
Digital Architect
@hn_will
www.linkedin.com/in/willhallonline
www.willhallonline.co.uk

Docker Command Line, Using and Choosing containers

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