.gitignore

did.log

00-dive-in-docker.js

console.log("Hello World!");

01-dive-in-docker.js

"use strict";

let http = require('http'),
    server = http.createServer((req, res) => {
        console.log(req.method + ' ' + req.url);
        
        if (req.url === '/kill') {
            process.exit(0);
        }
        
        res.writeHead(200, {'Content-Type': 'text/plain'});
        res.end(process.env['GREET'] ? process.env['GREET'] : "Hello World!");
    });
    
server.listen(8080);

02-dive-in-docker.js

"use strict";

let fs = require("fs"),
    http = require("http");

if (fs.existsSync("/logs") === false) {
    console.log("Creating log directory");
    fs.mkdirSync("/logs");
}

let log = fs.openSync("/logs/did.log", "a"),
    server = http.createServer((req, res) => {

        fs.writeSync(log, req.method + " " + req.url + "\n");

        if (req.url === "/kill") {
            process.exit(0);
        }

        res.writeHead(200, {"Content-Type": "text/plain"});
        res.end(process.env["GREET"] ? process.env["GREET"] : "Hello World!");
    });

server.listen(8080);

03-dive-in-docker.js

"use strict";

let fs = require("fs"),
    http = require("http");

if (fs.existsSync("/logs") === false) {
    console.log("Creating log directory");
    fs.mkdirSync("/logs");
}

let log = fs.openSync("/logs/did.log", "a"),
    server = http.createServer((req, res) => {
        fs.writeSync(log, (process.env["DID"] ? process.env["DID"] : 1) + " " + req.method + " " + req.url + "\n");

        if (req.url === "/kill") {
            process.exit(0);
        }

        res.writeHead(200, {"Content-Type": "text/plain"});
        res.end(process.env["GREET"] ? process.env["GREET"] : "Hello World!");
    });

server.listen(8080);

03-dive-in-docker.sh

if [ "$1" = "stop" ]
then
    docker rm -f dive-in-docker-haproxy
    docker rm -f dive-in-docker-1
    docker rm -f dive-in-docker-2

    exit 0
fi

docker run -d \
            --name dive-in-docker-1 \
            --volume $(pwd):/app:ro \
            --volume $(pwd):/logs \
            --env DID=1 \
            dive-in-docker \
            /app/03-dive-in-docker.js

docker run -d \
            --name dive-in-docker-2 \
            --volume $(pwd):/app:ro \
            --volume $(pwd):/logs \
            --env DID=2 \
            --env GREET \
            dive-in-docker \
            /app/03-dive-in-docker.js

docker run -d \
            --name dive-in-docker-haproxy \
            --link dive-in-docker-1:did1 \
            --link dive-in-docker-2:did2 \
            --publish 8888:80 \
            --volume $(pwd)/haproxy.cfg:/usr/local/etc/haproxy/haproxy.cfg:ro \
            haproxy

docker-compose.yml

dive-in-docker-1:
    image: dive-in-docker
    command: /app/03-dive-in-docker.js
    environment:
        - DID=1
    volumes:
        - .:/app:ro
        - .:/logs

dive-in-docker-2:
    image: dive-in-docker
    command: /app/03-dive-in-docker.js
    environment:
        - DID=2
        - GREET
    volumes:
        - .:/app:ro
        - .:/logs

dive-in-docker-haproxy:
    image: haproxy
    links:
        - dive-in-docker-1:did1
        - dive-in-docker-2:did2
    ports:
        - 8888:80
    volumes:
        - ./haproxy.cfg:/usr/local/etc/haproxy/haproxy.cfg:ro

Dockerfile

FROM jubianchi/docker-node-4

RUN opkg-cl update && \
    opkg-cl upgrade

ADD ./ /app

EXPOSE 8080

CMD ["/app/00-dive-in-docker.js"]

Dockerfile-updated

FROM jubianchi/docker-node-4

RUN opkg-cl update && \
    opkg-cl upgrade

RUN curl -s \
    http://nodejs.org/dist/v5.1.0/node-v5.1.0-linux-x64.tar.gz \
    | gunzip | tar -xf - -C /

ADD ./ /app

EXPOSE 8080

ENTRYPOINT ["/node-v5.1.0-linux-x64/bin/node"]
CMD ["/app/01-dive-in-docker.js"]

haproxy.cfg

defaults
    log                     global
    option                  httplog
    option                  dontlognull
    option                  http-server-close
    option                  forwardfor except 127.0.0.0/8
    option                  redispatch
    option                  httplog
    retries                 3
    timeout http-request    10s
    timeout queue           1m
    timeout connect         10s
    timeout client          1m
    timeout server          1m
    timeout http-keep-alive 10s
    timeout http-request    15s
    timeout check           10s
    maxconn                 3000

listen stats
    bind *:8080
    mode http
    stats enable
    stats uri /

frontend all
    bind *:80
    mode http

    acl acl_stats path_beg /stats

    default_backend dive_in_docker
    use_backend haproxy_stats if acl_stats

backend dive_in_docker
    mode http
    option forwardfor
    balance roundrobin
    option httpchk HEAD /

    server srv_did_1 did1:8080 check inter 10s
    server srv_did_2 did2:8080 check inter 10s

backend haproxy_stats
    mode http
    option forwardfor

    server ha_1 127.0.0.1:8080 check inter 1s

docker run --rm \
            --volume $(pwd):/app \
            --publish 8888:8080/tcp \
            --name dive-in-docker \
            jubianchi/docker-node-4:latest \
            /app/01-dive-in-docker.js

export GREET='Hello Docker!'

docker run --rm \
            --volume $(pwd):/app \
            --env GREET \
            --publish 8888:8080/tcp \
            --name dive-in-docker \
            jubianchi/docker-node-4:latest \
            /app/01-dive-in-docker.js

GREET='Hello Docker!' ./03-dive-in-docker.sh

./03-dive-in-docker.sh stop

GREET='Hello Docker!' docker-compose up