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‎intro-to-docker-pt2.html

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<!doctype html>
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<html lang="en">
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<head>
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<!--
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The contents of this file are based on index.html from the reveal.js project.
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Some details such as dependancies may not be needed or may change in the future.
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Once it has been written, this template and any lectures based off of it should
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be accompanied by a shell script to set up and/or run the presentation with minimal
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user interference.
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-->
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<meta charset="utf-8">
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<title>Zip Code Lecture: Intro to Docker</title>
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<meta name="description" content="A reveal.js-based Zip Code Wilmington Lesson: Intro to Docker">
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<!-- TODO: Put your name here: -->
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<meta name="author" content="Roberto DeDeus">
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padding: 0px 4px;
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<div class="slides">
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<section>
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<!-- This logo is used in every copy of this file. Drop a new file
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into img/Logo.jpg to change it across all slide decks -->
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So that new slides are easily recognizable while editing markdown
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<section data-markdown="md/intro-to-docker-pt2.md"
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<script src="lib/js/head.min.js"></script>
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<script src="js/reveal.js"></script>
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dependencies: [
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{ src: 'lib/js/classList.js', condition: function() { return !document.body.classList; } },
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{ src: 'plugin/markdown/marked.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
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‎intro-to-docker.html

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‎md/intro-to-docker-pt1.2.md

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# Intro to Docker
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### Unit: 1 Containers
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CLI Monitoring
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-
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### What’s going on in Containers:
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● docker container top - process list in one container
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● docker container inspect - details of one container config
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● docker container stats - performance stats for all containers
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-
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### Let’s start a nginx container
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● docker container run -d --name nginx nginx
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● docker container top nginx
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-
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### Let’s start a mysql container
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● docker container run -d --name mysql -e MYSQL_RANDOM_ROOT_PASSWORD=true mysql
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● docker container top mysql
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-
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### Docker container inspect
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● docker container inspect mysql
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● This will return a JSON array of all the data involved in starting up the
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container
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-
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### Docker container stats
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● docker container stats
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● This will give you a running play on the processes running in containers on
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your machine
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● This is not what you would use in production
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● It’s great for when you are working on your local machine
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-
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### Getting a Shell inside Containers
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● docker container run -it
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○ starts new containers interactively
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● docker container exec -it
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○ run additional command in existing container
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● Different Linux distros in containers
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-
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### Container flags `-i` , `-t` or `-it`
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● -t pseudo-tty
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○ Simulates a real terminal, like what SSH does
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● -i, --interactive
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○ Keep STDIN open even if not attached
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○ This allows us to keep the session open even when there are no commands
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-
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### Container additional commands
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● usage : docker container run [OPTIONS] IMAGE [COMMAND] [ARGS...]
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● docker container run -it --name proxy nginx bash
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○ Here by placing bash after the image name ‘nginx’ we are overriding the default action of
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this container
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○ This will log you in as the root user of the container
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○ Try using ls
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○ Using the exit command to leave the container and end.
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○ Containers only run as log as the command on startup
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-
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### Let’s pull down a full distribution
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● docker container run -it --name ubuntu ubuntu
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○ Once logged in run apt-get update
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○ This is a stripped down version of Ubuntu , and would not contain all the things that comes
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with a full distribution by default.
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○ You can even install things normally apt-get install -y curl
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○ Once you exit the container again... it will stop the container
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○ If we restarted the container CURL would be installed
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### Docker container start
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● docker container start --help
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● -a, --attach :: Attach STDOUT/STDERR and forward signals
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● docker container start -ai ubuntu
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Docker container exec
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● Let's say we want to look inside of an container already running a process
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● docker container exec -it mysql bash
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○ Will place you in a container inside of sql
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○ In this shell we can jump directly into the mysql command line
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○ Try ps aux
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○ When you finally exit the process will continue
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○ run docker ps
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### Linux Alpine
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● A small security focused distribution of linux
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● Lets pull down a copy of alpine and take a look
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○ docker pull alpine
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○ docker image ls
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● Let’s try :
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○ docker container run -it alpine bash
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○ The above will not work because bash is not part of the distribution
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● Lets try:
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○ docker container run -alpine sh
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○ The above will work because sh is include in this image, although it has less features
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available than bash.
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-
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# Unit: 1 Containers
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### Networking Concepts
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-
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### Docker Networks: Concepts
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● Review of docker container run -p
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● For local dev/testing, networks usually “just work”
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○ Dockers motto Batteries are included but removable
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● Quick porr check with docker container port <container>
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● Learn concepts of Docker Networking
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-
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### Docker Network Defaults
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● Each container connected to a private virtual network “bridge” ○ This is the default docker system network
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● Each virtual network routes through NAT firewall on host IP
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○ The docker daemon configures the host ip address on its default interface so that
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containers can get out to the internet
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● All containers on a virtual network can talk to each other with -p
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● Best practice is to create a new virtual network for each app
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○ Network “zcw_web_app” for mysql and php/apache containers
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○ Network “zcw_api” for mongo and nodejs containers
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-
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### Docker Networks Cont.
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● “Batteries Included, But Removable”
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○ Default work well in many cases, but easy to swap out parts to customize it
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● Things you can change
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○ Make new virtual networks
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○ Attach containers to more than one virtual network (or none)
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○ Skip virtual networks and use host IP (--net=host)
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■ You lose contanerization benefits but it’s unavoidable ○ Use different Docker network drivers to gain new abilities
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### `-p (--publish)`
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● Publishing ports is always in HOST:CONTAINER format
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● RUN: docker container run -p 80:80 --name webhost -d nginx
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● RUN: docker container port webhost
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○ 80/tcp -> 0.0.0.0:80
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### Inspect `--format`
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● docker container inspect --format '{{ .NetworkSettings.IPAddress }}' webhost ○ Will return the ip address of the container ‘172.17.0.3’
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● Run: ifconfig en0
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○ Will return the ip address of local machine ‘10.0.0.92’
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○ Notice that the two machines are not on the same network
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○ There is an edge firewall that blocks calls in and out
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○ Docker has a default bridge that maps to our local ethernet interface
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○ Using the -p on docker will allow external traffic into the docker virtual network
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○ Containers on the same network have access to each other, unless you use -p there will be
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no incoming calls.
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-
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### Docker Networks: Concepts recap
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● Review of docker container run -p
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● For local/dev testing, networks usually “just work”
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● Quick port check with docker container port <container>
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● Learn concepts of Docker networking
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# Unit: 1 Containers
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### CLI Management
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### Docker Networks : CLI Management
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● Show networks docker network ls
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● Inspect a network docker network inspect
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● Create a network docker network create --driver
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● Attach a network to a container docker network connect
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● Detach a network from container docker network disconnect
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### Docker Networks
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● Run : docker network ls
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● Run : docker network inspect bridge
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○ Will list the containers that are attached to this network
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● Three default networks
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○ Host network - a special network that skips virtual networks but sacrifices security of a
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container
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○ Bridge network - default network for docker host
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○ None network - it has not attachment
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### Docker Networks
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● Run : docker network create zcw_app_network
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● Run : docker network ls
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○ We can now see our new network with a driver of bridge ■ Bridge is the default network driver
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● Run : docker network create --help
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● Run : docker container run -d --name new_nginx --network zcw_app_network nginx
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● Run : docker network inspect zcw_app_network
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### Docker Networks :
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● Docker network connect
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○ Dynamically creates a NIC (networking interface card) in a container on an existing virtual
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network
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● Run : docker network ls
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● Run : docker network inspect bridge
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### Lab : CLI Testing
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● Use different Linux distro containers to check curl cli tool versions
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● Use two different terminal windows to start bash in both centos:7 and
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ubuntu:14.04, using -it
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● Use the docker container --rm options so you can save cleanup
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● Ensure curl is installed and on latest version for that distro
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○ ubuntu : apt-get update && apt-get install curl
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○ Centos : yum update curl
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● check curl --version
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