Docker Tech Talk Demo Script

This Repository contains the code I used for the live demonstration during the tech talk at Credit Agricole - Feb 27, 2016.

The code samples come from exising Docker labs material (see references below).

The slides are available as well

Docker CLI

Using Docker For Mac / Docker For Windows

docker pull alpine

docker image ls

Do this multipe times

docker run -it alpine /bin/sh

hostname
ps -a
ls -l
uptime

CTRL+D

docker run -it --rm busybox 

CTRL+D

docker run -d -p 80:80 --name webserver -v $PWD/static_site:/usr/share/nginx/html:ro nginx:alpine

docker stop webserver
docker rm webserver

Clean up containers

docker container prune

docker run -it --name test ubuntu:latest /bin/bash

apt-get install rolldice

CTRL+D

docker container ls -a

docker commit -t so0k:rolldice test

Instead, use a Dockerfile... static-site\Dockerfile

docker build -t so0k/static-site:latest .

docker run --name static-site -e AUTHOR="Docker Singapore" -d -p 80:80 so0k/static-site

CTRL+D

Docker Compose

Run a simple Flask app with a Redis cache.

cd counter/
docker-compose up

Change the code

vim app.py

Notice application code reloaded...

Another simple Python app (Master-Slave)

cd ../locust/
docker-compose up -d

Start the swarm

curl -XPOST http://127.0.0.1:8089/swarm -d"locust_count=20&hatch_rate=10"

Watch the status

watch -n 1 "curl -s http://127.0.0.1:8089/stats/requests | jq -r '[.user_count, .total_rps, .state] | @tsv'

Stop the swarm

curl http://127.0.0.1:8089/stop

Clean up

cd ../counter
docker-compose down --volume

cd ../locust
docker-compose down --volume

Using Docker-Machine:

• Manage remote hosts
• Provision multiple hosts locally
• ..

docker-machine create --driver xhyve manager

Note: If network is a concern, do this in advance as well as

(cd vote;docker-compose pull)

docker-machine ls

docker-machine ssh manager
uname -a

docker-machine env manager
eval $(docker-machine env manager)

docker run -d --name static-site -e AUTHOR="Docker Singapore!" -d -p 80:80 so0k/static-site

docker-machine ip manager

open website on manager IP..

Notice also:

docker system info

Docker Swarm

Create a Swarm of Nodes

Create another node for the swarm

docker-machine create --driver xhyve worker

docker swarm init

eval $(docker-machine env worker)

docker swarm join \
     --token SWMTKN-?? \
     192.168.64.24:2377

Deploy Stack across swarm

Talk to manager

eval $(docker-machine env manager)

docker stack -h

cd vote/
docker-compose config | less
docker stack deploy -c docker-compose.yaml vote

docker service ls

Ports:

• 8080 for node viz
• 5000 for voting app
• 5001 for result app

Clean up

docker stack rm vote

docker-machine rm manager worker

Unset docker environment:

eval $(docker-machine env -u)

References

• Static site
• Compose
• Locust
• xhyve driver
• aws driver
• Voting App
• What's New in 1.13