EU-Vietnam Business Network (EVBN) > Noindex > Docker Compose Networking Deep Dive — Docker Kubernetes Lab 0.1 documentation

Docker Compose Networking Deep Dive — Docker Kubernetes Lab 0.1 documentation

Docker Compose Networking Deep Dive¶

Note

We suggest that you should complete the lab Bridge Networking Deep Dive firstly before going to this lab.

This lab will use example-voting-app as the demo application run by docker-compose, you can find the source code of the project in
https://github.com/DaoCloud/example-voting-app

Using Compose is basically a three-step process.

  1. Define your app’s environment with a Dockerfile so it can be reproduced anywhere.
  2. Define the services that make up your app in docker-compose.yml so they can be run together in an isolated environment.
  3. Lastly, run docker-compose up and Compose will start and run your entire app.

For example-voting-app, we already have Dockerfile and docker-compose.yml, what need to do is docker-compose up.

Install Docker Compose¶

There are many ways to install docker compose .

In our one node docker engine lab environment Lab Environment Quick Setup
we install docker compose as the following way in one docker host.

ubuntu@docker-node1:~$ sudo curl -L 
"https://github.com/docker/compose/releases/download/1.9.0/docker-compose-
$(
uname -s
)
-
$(
uname -m
)
"
 -o /usr/local/bin/docker-compose
ubuntu@docker-node1:~$ sudo chmod +x /usr/local/bin/docker-compose
ubuntu@docker-node1:~$ docker-compose -v
docker-compose version 
1
.9.0, build 
2585387

Start APP¶

Clone example-voting-app repository to docker host, it defined five containers: voting-app, result-app, worker, redis, db.
and two networks: front-tier, back-tier through docker-compose.yml.

version: 
"2"


services:
  voting-app:
    build: ./voting-app/.
    volumes:
     - ./voting-app:/app
    ports:
      - 
"5000:80"

    links:
      - redis
    networks:
      - front-tier
      - back-tier

  result-app:
    build: ./result-app/.
    volumes:
      - ./result-app:/app
    ports:
      - 
"5001:80"

    links:
      - db
    networks:
      - front-tier
      - back-tier

  worker:
    build: ./worker
    links:
      - db
      - redis
    networks:
      - back-tier

  redis:
    image: redis
    ports: 
[
"6379"
]

    networks:
      - back-tier

  db:
    image: postgres:9.4
    volumes:
      - 
"db-data:/var/lib/postgresql/data"

    networks:
      - back-tier

volumes:
  db-data:

networks:
  front-tier:
  back-tier:

Then run docker-compose build to build required docker images. This will take some time.

ubuntu@docker-node1:~$ git clone https://github.com/DaoCloud/example-voting-app
ubuntu@docker-node1:~$ 
cd
 example-voting-app/
ubuntu@docker-node1:~/example-voting-app$ sudo docker-compose build


ubuntu@docker-node1:~/example-voting-app$ sudo docker-compose up
Creating network 
"examplevotingapp_front-tier"
 with the default driver
Creating network 
"examplevotingapp_back-tier"
 with the default driver
Creating volume 
"examplevotingapp_db-data"
 with default driver
....
Creating examplevotingapp_db_1
Creating examplevotingapp_redis_1
Creating examplevotingapp_voting-app_1
Creating examplevotingapp_result-app_1
Creating examplevotingapp_worker_1
Attaching to examplevotingapp_redis_1, examplevotingapp_db_1, examplevotingapp_result-app_1, examplevotingapp_voting-app_1, examplevotingapp_worker_1
...

There will be five containers, two bridge networks and seven veth interfaces created.

ubuntu@docker-node1:~/example-voting-app$ sudo docker ps
CONTAINER ID        IMAGE                         COMMAND                  CREATED             STATUS              PORTS                     NAMES
c9c4e7fe7b6c        examplevotingapp_worker       
"/usr/lib/jvm/java-7-"
   About an hour ago   Up 
5
 seconds                                  examplevotingapp_worker_1
4213167049aa        examplevotingapp_result-app   
"node server.js"
         About an hour ago   Up 
4
 seconds        
0
.0.0.0:5001->80/tcp      examplevotingapp_result-app_1
8711d687bda9        examplevotingapp_voting-app   
"python app.py"
          About an hour ago   Up 
5
 seconds        
0
.0.0.0:5000->80/tcp      examplevotingapp_voting-app_1
b7eda251865d        redis                         
"docker-entrypoint.sh"
   About an hour ago   Up 
5
 seconds        
0
.0.0.0:32770->6379/tcp   examplevotingapp_redis_1
7d6dbb98ce40        postgres:9.4                  
"/docker-entrypoint.s"
   About an hour ago   Up 
5
 seconds        
5432
/tcp                  examplevotingapp_db_1
ubuntu@docker-node1:~/example-voting-app$ sudo docker network ls
NETWORK ID          NAME                          DRIVER              SCOPE
3b5cfe4aafa1        bridge                        bridge              
local

69a019d00603        examplevotingapp_back-tier    bridge              
local

6ddb07377c35        examplevotingapp_front-tier   bridge              
local

b1670e00e2a3        host                          host                
local

6006af29f010        none                          null                
local

ubuntu@docker-node1:~/example-voting-app$ brctl show
bridge name   bridge id               STP enabled     interfaces
br-69a019d00603               
8000
.0242c780244f       no              veth2eccb94
                                                      veth374be12
                                                      veth57f50a8
                                                      veth8418ed3
                                                      veth91d724d
br-6ddb07377c35               
8000
.02421dac7490       no              veth156c0a9
                                                      vethaba6401

Through docker network inspect, we can know which container connnect with the bridge.

There are two containers connect with docker network examplevotingapp_front-tier.

ubuntu@docker-node1:~/example-voting-app$ sudo docker network inspect examplevotingapp_front-tier

[

    
{

        
"Name"
: 
"examplevotingapp_front-tier"
,
        
"Id"
: 
"6ddb07377c354bcf68542592a8c6eb34d334ce8515e64832b3c7bf2af56274ca"
,
        
"Scope"
: 
"local"
,
        
"Driver"
: 
"bridge"
,
        
"EnableIPv6"
: false,
        
"IPAM"
: 
{

            
"Driver"
: 
"default"
,
            
"Options"
: null,
            
"Config"
: 
[

                
{

                    
"Subnet"
: 
"172.18.0.0/16"
,
                    
"Gateway"
: 
"172.18.0.1/16"

                
}

            
]

        
}
,
        
"Internal"
: false,
        
"Containers"
: 
{

            
"4213167049aa7b2cc1b3096333706f2ef0428e78b2847a7c5ddc755f5332505c"
: 
{

                
"Name"
: 
"examplevotingapp_result-app_1"
,
                
"EndpointID"
: 
"00c7e1101227ece1535385e8d6fe9210dfcdc3c58d71cedb4e9fad6c949120e3"
,
                
"MacAddress"
: 
"02:42:ac:12:00:03"
,
                
"IPv4Address"
: 
"172.18.0.3/16"
,
                
"IPv6Address"
: 
""

            
}
,
            
"8711d687bda94069ed7d5a7677ca4c7953d384f1ebf83c3bd75ac51b1606ed2f"
: 
{

                
"Name"
: 
"examplevotingapp_voting-app_1"
,
                
"EndpointID"
: 
"ffc9905cbfd5332b9ef333bcc7578415977a0044c2ec2055d6760c419513ae5f"
,
                
"MacAddress"
: 
"02:42:ac:12:00:02"
,
                
"IPv4Address"
: 
"172.18.0.2/16"
,
                
"IPv6Address"
: 
""

            
}

        
}
,
        
"Options"
: 
{}
,
        
"Labels"
: 
{}

    
}


]

There are five containers connect with docker network examplevotingapp_back-tier.

ubuntu@docker-node1:~/example-voting-app$ sudo docker network inspect examplevotingapp_back-tier

[

    
{

        
"Name"
: 
"examplevotingapp_back-tier"
,
        
"Id"
: 
"69a019d00603ca3a06a30ac99fc0a2700dd8cc14ba8b8368de4fe0c26ad4c69d"
,
        
"Scope"
: 
"local"
,
        
"Driver"
: 
"bridge"
,
        
"EnableIPv6"
: false,
        
"IPAM"
: 
{

            
"Driver"
: 
"default"
,
            
"Options"
: null,
            
"Config"
: 
[

                
{

                    
"Subnet"
: 
"172.19.0.0/16"
,
                    
"Gateway"
: 
"172.19.0.1/16"

                
}

            
]

        
}
,
        
"Internal"
: false,
        
"Containers"
: 
{

            
"4213167049aa7b2cc1b3096333706f2ef0428e78b2847a7c5ddc755f5332505c"
: 
{

                
"Name"
: 
"examplevotingapp_result-app_1"
,
                
"EndpointID"
: 
"cb531eb6deb08346d1dbcfa65ea67d43d4c2f244f002b195fc4dadd2adb0b47d"
,
                
"MacAddress"
: 
"02:42:ac:13:00:06"
,
                
"IPv4Address"
: 
"172.19.0.6/16"
,
                
"IPv6Address"
: 
""

            
}
,
            
"7d6dbb98ce408c1837f42fdf743e365cc9b0ee2b7dffd108d97e81b172d43114"
: 
{

                
"Name"
: 
"examplevotingapp_db_1"
,
                
"EndpointID"
: 
"67007a454f320d336c13e30e028cd8e85537400b70a880eabdd1f0ed743b7a6a"
,
                
"MacAddress"
: 
"02:42:ac:13:00:03"
,
                
"IPv4Address"
: 
"172.19.0.3/16"
,
                
"IPv6Address"
: 
""

            
}
,
            
"8711d687bda94069ed7d5a7677ca4c7953d384f1ebf83c3bd75ac51b1606ed2f"
: 
{

                
"Name"
: 
"examplevotingapp_voting-app_1"
,
                
"EndpointID"
: 
"d414b06b9368d1719a05d527500a06fc714a4efae187df32c1476385ee03ae67"
,
                
"MacAddress"
: 
"02:42:ac:13:00:05"
,
                
"IPv4Address"
: 
"172.19.0.5/16"
,
                
"IPv6Address"
: 
""

            
}
,
            
"b7eda251865d824de90ebe0dfefa3e4aab924d5030ccfb21a55e79f910ff857a"
: 
{

                
"Name"
: 
"examplevotingapp_redis_1"
,
                
"EndpointID"
: 
"9acc267d3e6b41da6fe3db040cff964c91037df215a0f2be2155b94be3bb87d0"
,
                
"MacAddress"
: 
"02:42:ac:13:00:02"
,
                
"IPv4Address"
: 
"172.19.0.2/16"
,
                
"IPv6Address"
: 
""

            
}
,
            
"c9c4e7fe7b6c1508f9d9d3a05e8a4e66aa1265f2a5c3d33f363343cd37184e6f"
: 
{

                
"Name"
: 
"examplevotingapp_worker_1"
,
                
"EndpointID"
: 
"557e978eaef18a64f24d400727d396431d74cd7e8735f060396e3226f31ab97b"
,
                
"MacAddress"
: 
"02:42:ac:13:00:04"
,
                
"IPv4Address"
: 
"172.19.0.4/16"
,
                
"IPv6Address"
: 
""

            
}

        
}
,
        
"Options"
: 
{}
,
        
"Labels"
: 
{}

    
}


]

Container information summary:

Container Name
IP Address

examplevotingapp_result-app_1
172.19.0.6/16, 172.18.0.3/16

examplevotingapp_voting-app_1
172.19.0.3/16, 172.18.0.2/16

examplevotingapp_redis_1
172.19.0.2/16

examplevotingapp_worker_1
172.19.0.4/16

examplevotingapp_db_1
172.19.0.3/16

Docker network information summary:

Docker Network Name
Gateway
Subnet
Containers

examplevotingapp_front-tier
172.18.0.1/16
172.18.0.0/16
examplevotingapp_result-app_1, examplevotingapp_voting-app_1

examplevotingapp_back-tier
172.19.0.1/16
172.19.0.0/16
examplevotingapp_result-app_1, examplevotingapp_voting-app_1, examplevotingapp_db_1, examplevotingapp_redis_1, examplevotingapp_worker_1

Network Topology¶

../_images/docker-compose.png

For bridge network connection details, please reference lab Bridge Networking Deep Dive

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