Scale app with Docker Sawrm

steps.md

1. Create machines / nodes

node-01
node-02
node-03

2. Update machine

apt-get update
apt-get upgrade -y

3. Enable ports

ufw allow 22/tcp
ufw allow 2376/tcp
ufw allow 2377/tcp
ufw allow 7946/tcp
ufw allow 7946/udp
ufw allow 4789/udp
ufw reload
ufw enable
systemctl restart docker

• https://docs.docker.com/engine/swarm/swarm-tutorial/#open-protocols-and-ports-between-the-host
• https://www.digitalocean.com/community/tutorials/how-to-configure-the-linux-firewall-for-docker-swarm-on-ubuntu-16-04

4. Check ports

lsof -i -P -n | grep LISTEN
netstat -tulpn | grep docker

5. Init Swarm

docker swarm init --advertise-addr
docker swarm join-token manager
docker swarm join-token worker

6. Create visualizer (optional)

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

docker service ls

• http://dockerlabs.collabnix.com/intermediate/workshop/getting-started-with-swarm.html

7. Download repo (bad practice)

git clone repo

8. Build and Deploy

docker-compose -f docker-compose.prod.yml build
docker stack deploy -c docker-compose.prod.yml prod-dashboard
docker service ls

9. Scale service

docker service scale prod-dashboard_api=2

• https://dockerswarm.rocks