DevOps - A simple Docker Swarm application using node.js to run Video on Demand services

Download This video with 4k resolution and then rename it with DolbyVision.mkv

Install the program

1. Build Node js app in docker

docker build -t <app name> .

2. running the services (but we want to run Docker swarm, so we do not need to do)

docker run -it -p 3000:8000 <app name>

Run Docker Swarm

1. Create swarm services (in some case firewall was blocked by ubuntu, you must enable it first with "sudo ufw allow 2377")

docker swarm init --advertise-addr <ip>

2. Copy token to node os
3. Vertify node

docker node ls

4. create services

# for running in one node
docker service create --name <name> -p 3000:8000 <image-name>

or

# for running in global nodes (all nodes connected to the token)
docker service create --name <name> -p 3000:8000 --mode global <image-name>

or

# enter manually the desired number of nodes
docker service create --name <name> -p 3000:8000 --relplicas <n node> <image-name>

5. Check running aplication

docker ps

6. List of Services

docker service ls

7. List task of services

docker service ps <name>

8. Scale app services

docker service scale <name>=<n node>

9. Remove node app (optional)

docker node rm <name>

10. Remove service (optional)

docker service rm <name>

11. Turn off node (optional)

docker node update --availability drain <Node ID>

12. Turn on node (optional)

docker node update --availability active <Node ID>

NGINX Load Balancing

1. Prepare the Diretory

sudo mkdir -p /data/loadbalancer

2. Create load balancer setup file with name "default.conf"

sudo nano /data/loadbalancer/default.conf

3. Write load balancer "default.conf"

server {
   listen 8000;
   location / {
      proxy_pass http://backend;
   }
}
upstream backend {
   server <manager ip>:3000;
   server <worker-1 ip>:3000;
   server <worker-2 ip>:3000;
}

4. create new docker service for nginx load balancer

docker service create \
--name loadbalancer \
--mount type=bind,source=/data/loadbalancer,target=/etc/nginx/conf.d \
--publish 80:80 \
swarm-lb