bb-docker

Demo during the Brown Bag session about Docker

Prerequisites

Docker engine and docker-machine installed on Ubuntu 16.04 LTS

Virtualbox installed on your laptop or an account on DigitalOcean

Steps to run the demo

Clone the repo

git clone https://github.com/benfab/bb-docker.git

Deploy the Swarm Cluster

Virtualbox

./create-swarm.sh --driver virtualbox --manager 3 --worker 1

Digitalocean

./create-swarm.sh --driver digitalocean --digitalocean_token <token> --manager 3 --worker 5

Check the Swarm cluster

docker-machine ls

eval "$(docker-machine env <node-name>)"

docker node ls

docker swarm join-token worker

docker swarm join-token manager

Revoke a node certificate

docker-machine regenerate-certs <node-name>

Deploy dockercoins and check the status

cd dockercoins

docker stack deploy --bundle-file dockercoins.dab dockercoins

docker service ls

docker stack ps dockercoins

Expose the port 8000

docker service update dockercoins_webui --publish-add 8000:80

Scale-up the dockercoins service and see the hash speed increasing

docker service scale dockercoins_worker=3

Check the network

docker network ls

Deploy a new service called debug

docker service create --name debug --network dockercoins_default --mode global busybox sleep 1000000

docker ps

docker exec -it <container-id> sh

Resolve the dockercoins_worker service Virtual IP

nslookup dockercoins_worker

Resolve the dockcoins_worker tasks IPs

nslookup tasks.dockercoins_worker

Update the service dockercoins_worker

With the flags specified, 2 tasks will be updated at a time with a delay of 10 seconds between the tasks updates

docker service update dockercoins_worker --update-parallelism 2 --update-delay 10s --image benfab/dockercoins_worker:v0.1

Drain a node

docker node ps <node-name>

docker node update <node-name> --availability drain

check if the tasks have been rescheduled

docker service ps dockercoins_hasher

delete the cluster

cd ..

./delete-swarm.sh