Docker Swarm Sample

Docker swarm sample with NodeJS app on Hyper-V

Prerequisites

• This sample is using Hyper-V

1. Clone sample repository

git clone https://github.com/wswijaya/docker-swarm-node-app.git

2. Build Docker Image and push to Docker Hub

docker build -t <your docker id>/node-app-sample .
docker push <your docker id>/node-app-sample

3. Create VMs

docker-machine create -d hyperv --hyperv-virtual-switch "myswitch" myvm3
docker-machine create -d hyperv --hyperv-virtual-switch "myswitch" myvm2
docker-machine create -d hyperv --hyperv-virtual-switch "myswitch" myvm3
docker-machine create -d hyperv --hyperv-virtual-switch "myswitch" myvm4

4. Create Docker Swarm and set VM1, VM3, and VM4 as manager

docker-machine ssh myvm1 "docker swarm init"
docker-machine ssh myvm1 "docker swarm join-token manager"
docker-machine ssh myvm3 "docker swarm join --token <token> <ip>:<port>"
docker-machine ssh myvm4 "docker swarm join --token <token> <ip>:<port>"
docker-machine ssh myvm1 "docker swarm join-token worker"
docker-machine ssh myvm2 "docker swarm join --token <token> <ip>:<port>"

5. Deploy Services

docker-machine scp docker-compose-node-app.yml myvm1:~
docker-machine ssh myvm1 "docker stack deploy -c docker-compose-node-app.yml nodeapplab"
docker-machine ssh myvm1 "docker stack ps nodeapplab"

6. Test Site

• Node Web App: http://<ip>:4000 or http://<ip>:4000/api
• Docker Visualizer: http://<ip>:9090

7. Remove Services

docker-machine ssh myvm1 "docker stack rm nodeapplab"

8. Remove Docker Swarm

docker-machine ssh myvm1 "docker stack rm nodeapplab"
docker-machine ssh myvm2 "docker swarm leave"
docker-machine ssh myvm3 "docker swarm leave --force"
docker-machine ssh myvm4 "docker swarm leave --force"
docker-machine ssh myvm1 "docker swarm leave --force"

Optional: Configure Load Balancer using HAProxy

Installation steps for HAProxy on Ubuntu -> https://www.digitalocean.com/community/tutorials/how-to-use-haproxy-to-set-up-http-load-balancing-on-an-ubuntu-vps

Sample config file /etc/haproxy/haproxy.cfg

global
      daemon
      maxconn 200

defaults
      mode http
      timeout connect 5000ms
      timeout client 10000ms
      timeout server 10000ms

frontend  http-in
      bind *:9090
      default_backend servers

backend servers
      server vm1 <ip>:<port> maxconn 40
      server vm3 <ip>:<port> maxconn 40
      server vm4 <ip>:<port> maxconn 40