Docker Swarm Presentation

Presentation

Slides

Building a docker swarm cluster

docker-machine create -d virtualbox manager

for i in 1 2; do
    docker-machine create -d virtualbox worker-$i
done

Checking my machines

docker-machine ls

Creating the cluster

eval "$(docker-machine env manager)"

docker swarm init --advertise-addr $(docker-machine ip manager)

Adding the visualizer service

eval "$(docker-machine env manager)"

docker service create \
  --name=visualizer \
  --publish=8000:8080/tcp \
  --constraint=node.role==manager \
  --mount=type=bind,src=/var/run/docker.sock,dst=/var/run/docker.sock \
  --detach=false \
  dockersamples/visualizer

explorer http://$(docker-machine ip manager):8000

Adding workers to the cluster

eval "$(docker-machine env manager)"
JOIN_TOKEN=$(docker swarm join-token -q worker)

for i in 1 2; do
    eval "$(docker-machine env worker-$i)"

    docker swarm join --token $JOIN_TOKEN \
        --advertise-addr $(docker-machine ip worker-$i) \
        $(docker-machine ip manager):2377
done

eval "$(docker-machine env manager)"
docker node ls

Creating network

eval "$(docker-machine env manager)"
docker network create -d overlay routing-mesh

Deploy a new service

eval "$(docker-machine env manager)"
docker service create \
  --name=docker-routing-mesh \
  --publish=8080:8080/tcp \
  --network routing-mesh \
  --reserve-memory 20m \
  lanovoy/docker-swarm-presentation:1.0

Testing the service

curl http://$(docker-machine ip manager):8080
curl http://$(docker-machine ip worker-1):8080
curl http://$(docker-machine ip worker-2):8080

Scaling a service

docker service scale docker-routing-mesh=3

Calling a service

while true; do curl http://$(docker-machine ip manager):8080; sleep 1; printf "\n";  done

Rolling updates

eval "$(docker-machine env manager)"
docker service update \
  --update-failure-action pause \
  --update-parallelism 1 \
  --image lanovoy/docker-swarm-presentation:2.0 \
  docker-routing-mesh

Calling a service

while true; do curl http://$(docker-machine ip manager):8080/health; sleep 1; printf "\n";  done

Docker secret create

docker-machine.exe ssh manager

echo my-very-secret-value | docker secret create my_secret -

Docker secret ls

docker secret ls

Deploy my secret

eval "$(docker-machine env manager)"
docker service update \
  --update-failure-action pause \
  --update-parallelism 1 \
  --secret-add my_secret \
  --image lanovoy/docker-swarm-presentation:2.0 \
  docker-routing-mesh

curl http://$(docker-machine ip manager):8080

docker exec $(docker ps --filter name=docker-routing-mesh -q) ls -l /run/secrets

Drain a node

docker node update --availability=drain worker-2

while true; do curl http://$(docker-machine ip manager):8080/health; sleep 1; printf "\n";  done

Listing nodes

docker node ls

Bring the node back

docker node update --availability=active worker-2