CC Swarm Demo

demo_script.txt

# Delete any old containers and services

sudo docker service ls
sudo docker service rm $(sudo docker service ls -q)
sudo docker rm -f $(sudo docker ps -a -q)

# Show you can just run containers with the "exact same CLI"

docker run -it debian


# Show that we are running with a different default runtime

systemctl status docker

#Needed only for the first time
docker swarm init

# Show the nodes that are currently present in the swarm
docker node ls

# Kick off a scaleable web server that responds back with the hostname of the actual container
# that is responding to the request
docker service create --name my_web --replicas 3 --publish 8080:80 nginx /bin/bash -c "hostname > /usr/share/nginx/html/hostname; nginx -g \"daemon off;\""

# show that there are 3 containers each in its own qemu-kvm VM
sudo docker service ls
docker ps
ps auxw | grep qemu

# Kick off multiple queries, you should see responses from different hosts
curl 127.0.0.1:8080/hostname; curl 127.0.0.1:8080/hostname; curl 127.0.0.1:8080/hostname; curl 127.0.0.1:8080/hostname;

# show that there are 3 containers each in its own qemu-kvm VM
docker ps
ps auxw | grep qemu

# Now scale it up
docker service scale my_web=8

# Show we have 8 containers
sudo docker service ls


# You will have 8 unique responses
curl 127.0.0.1:8080/hostname; curl 127.0.0.1:8080/hostname; curl 127.0.0.1:8080/hostname; curl 127.0.0.1:8080/hostname;
curl 127.0.0.1:8080/hostname; curl 127.0.0.1:8080/hostname; curl 127.0.0.1:8080/hostname; curl 127.0.0.1:8080/hostname;


# show that there are 8 containers each in its own qemu-kvm VM
docker ps
ps auxw | grep qemu
docker service remove my_web

systemctl status docker

and

systemctl status docker-cor