MEAN Docker Stack App

This is an example of how to deploy MEAN-stack application with Docker Compose and in a Docker Swarm Cluster.

Code base for this article series

Application structure

• server: Express, Mongoose
• client: Angular, Angular Universal
• database: MongoDB
• reverse proxy: Træfik

Docker images

Build:

docker build -t username/repository:mean-docker-server ./server  
docker build -t username/repository:mean-docker-client ./client 

Push to a registry:

docker push username/repository:mean-docker-server  
docker push username/repository:mean-docker-client  

Run using Docker Compose

Hosts config for reverse proxy:

# windows:      c:/windows/system32/drivers/etc/hosts
# ubuntu/mac:   /etc/hosts

127.0.0.1       docker-example.local
127.0.0.1       api.docker-example.local

# Traefik Dashboard
127.0.0.1       traefik.docker-example.local 

Create reverse proxy network:

docker network create traefik-net  

Run application:

docker-compose up -d

Enter http://docker-example.local in a browser to see the application running.

Scale:

docker-compose up --scale server=2 --scale client=3 -d

Logs:

docker-compose logs  

Stop and remove containers created by up:

docker-compose down

Run in Docker Swarm mode

Create machines

Windows

Setup Hyper-V >>

docker-machine create -d hyperv --hyperv-virtual-switch "myswitch" vm0
docker-machine create -d hyperv --hyperv-virtual-switch "myswitch" vm1
docker-machine create -d hyperv --hyperv-virtual-switch "myswitch" vm2

Mac/Linux

docker-machine create --driver virtualbox vm0
docker-machine create --driver virtualbox vm1
docker-machine create --driver virtualbox vm2

Initialize the swarm

Set environment variables to dictate that docker should run a command against a particular machine:

docker-machine env vm0

Initialize a swarm:

docker swarm init 

Copy pre-configured docker swarm join command

Add nodes

Switch to another machine:

docker-machine env vm1

and run pre-configured join command:

docker swarm join --token SWMTKN-1-52qk72ooyql1zfxb0lezwmj52oipimmgln6zh3skbdokl6pp3c-179u2zzjdffcaqjni4zjst188 192.168.2.40:2377  

And the same with vm2

Hosts

# windows:    c:/windows/system32/drivers/etc/hosts
# ubuntu/mac: /etc/hosts

192.168.2.40       docker-example.local  
192.168.2.40       api.docker-example.local  
192.168.2.40       traefik.docker-example.local  
192.168.2.40       visualizer.docker-example.local 

192.168.2.40 is a manager node IP (vm0). Get it with the docker-machine ls command.

Deploy

Create reverse proxy network:

docker network create -d overlay traefik-net 

Run the following command to deploy the app:

docker stack deploy -c docker-stack.yml meanstack  

Enter http://visualizer.docker-example.local in a browser to see the Docker Swarm visualizer.

Remove the stack:

docker stack rm meanstack

Mongo Replica Set

Set labels for nodes:

docker node update --label-add mongo.replica=0 vm0 
docker node update --label-add mongo.replica=1 vm1 
docker node update --label-add mongo.replica=2 vm2 

Deploy:

docker stack deploy -c docker-stack.mongo-rs.yml meanstack 

Initiate a replica set:

docker exec -it <mongo_container_id> sh

$ mongo

> rs.initiate( {
   _id : "rs0",
   members: [
      { _id: 0, host: "mongo0:27017" },
      { _id: 1, host: "mongo1:27017" },
      { _id: 2, host: "mongo2:27017" }
   ]
})

See the http://visualizer.docker-example.local/ page