├── .dockerignore
├── .gitignore
├── Dockerfile
├── README.md
├── handler.sh
├── hipache.json
├── launch-host
├── no-app-app
├── index.html
└── server
├── service.sh
└── supervisord.conf
/.dockerignore:
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1 | .git
2 | supervisor-logs
3 |
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/.gitignore:
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1 | logs
2 |
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/Dockerfile:
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1 | # Based on https://raw.githubusercontent.com/hipache/hipache/master/Dockerfile
2 |
3 | # Latest Ubuntu LTS
4 | FROM ubuntu:14.04
5 |
6 | # Install some stuff
7 | RUN apt-get -y update && \
8 | apt-get -y install supervisor nodejs npm redis-server && \
9 | npm install -g hipache
10 |
11 | # Download the docker CLI
12 | RUN apt-get install -y curl && \
13 | curl https://get.docker.io/builds/Linux/x86_64/docker-latest > /usr/bin/docker && \
14 | chmod +x /usr/bin/docker
15 |
16 | # Download and install jq
17 | RUN curl http://stedolan.github.io/jq/download/linux64/jq > /usr/bin/jq && \
18 | chmod +x /usr/bin/jq
19 |
20 | # Install the static web server
21 | RUN npm install -g node-static
22 |
23 | # Add our supervisor configs
24 | ADD ./supervisord.conf /etc/supervisor/conf.d/supervisord.conf
25 |
26 | # Add our custom hipache configs
27 | ADD hipache.json /usr/local/lib/node_modules/hipache/config/config.json
28 |
29 | # Our docker events handler
30 | ADD ./service.sh /usr/bin/auto-lb
31 | ADD ./handler.sh /usr/bin/auto-lb-handler
32 |
33 | # The dummy app that handles unknown domains
34 | ADD ./no-app-app /no-app-app
35 |
36 | # Expose hipache
37 | EXPOSE 80
38 |
39 | # Start supervisor
40 | CMD ["supervisord", "-n"]
41 |
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/README.md:
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1 | # Docker Easy Load Balancer
2 |
3 | Experimental _automagic_ load balancing for Docker web apps in less than 100 lines of bash.
4 |
5 | 
6 |
7 | ## Initial setup
8 |
9 | On Ubuntu 14.04 hosts, you'll need to install [libnss-resolver](https://github.com/azukiapp/libnss-resolver#installing)
10 | and run:
11 |
12 | ```sh
13 | apt-get install dnsmasq
14 | echo "nameserver 127.0.0.1:5353" | sudo tee -a /etc/resolver/docker.dev
15 | ```
16 |
17 | _I suppose you are able to do something similiar when using Macs + [Vagrant](http://www.vagrantup.com/)
18 | / [boot2docker](http://boot2docker.io/) but I don't own a Mac to put the pieces
19 | together, LMK if you know how to make this work over there and I'll update the docs
20 | accordingly_
21 |
22 | ## Try it
23 |
24 | Launch the load balancer and DNS server:
25 |
26 | ```sh
27 | git clone https://github.com/fgrehm/docker-easy-lb.git
28 | cd docker-easy-lb
29 | ./launch-host
30 | ```
31 |
32 | And verify if things are working:
33 |
34 | ```
35 | # Is DNS working?
36 | $ ping hello.docker.dev
37 |
38 | PING hello.docker.dev (172.17.0.175) 56(84) bytes of data.
39 | 64 bytes from 172.17.0.175: icmp_seq=1 ttl=64 time=0.035 ms
40 | 64 bytes from 172.17.0.175: icmp_seq=2 ttl=64 time=0.072 ms
41 | 64 bytes from 172.17.0.175: icmp_seq=3 ttl=64 time=0.150 ms
42 | ^C
43 |
44 | # Can we reach the load balancer?
45 | $ curl hello.docker.dev
46 |
47 |
48 |
49 | 404 - No application configured for this subdomain
50 |
9 |
10 |
11 |
12 |
There's no application running at this address
13 |
14 |
15 |
16 |
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/no-app-app/server:
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1 | #!/bin/bash
2 |
3 | cd /no-app-app && nodejs /usr/local/bin/static -a '0.0.0.0'
4 |
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/service.sh:
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1 | #!/bin/bash
2 |
3 | if ! [ -S /var/run/docker.sock ]; then
4 | echo 'Docker socket not mounted'
5 | exit 1
6 | fi
7 |
8 | echo 'Cleaning up load balancer'
9 | redis-cli del "frontend:${DOMAIN}"
10 | redis-cli rpush "frontend:${DOMAIN}" default &>/dev/null
11 | redis-cli rpush "frontend:${DOMAIN}" 'http://0.0.0.0:8080' &>/dev/null
12 |
13 | redis-cli del "frontend:*.${DOMAIN}"
14 | redis-cli rpush "frontend:*.${DOMAIN}" defsubdomain &>/dev/null
15 | redis-cli rpush "frontend:*.${DOMAIN}" 'http://0.0.0.0:8080' &>/dev/null
16 |
17 | docker events | auto-lb-handler
18 |
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/supervisord.conf:
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1 | [supervisord]
2 | nodaemon=false
3 |
4 | [program:hipache]
5 | command=/usr/local/bin/hipache -c /usr/local/lib/node_modules/hipache/config/config.json
6 | stdout_logfile=/var/log/supervisor/%(program_name)s.log
7 | stderr_logfile=/var/log/supervisor/%(program_name)s.log
8 | autorestart=true
9 |
10 | [program:redis]
11 | user=redis
12 | command=/usr/bin/redis-server
13 | stdout_logfile=/var/log/supervisor/%(program_name)s.log
14 | stderr_logfile=/var/log/supervisor/%(program_name)s.log
15 | autorestart=true
16 |
17 | [program:no-app-app]
18 | command=/no-app-app/server
19 | stdout_logfile=/var/log/supervisor/%(program_name)s.log
20 | stderr_logfile=/var/log/supervisor/%(program_name)s.log
21 | autorestart=true
22 |
23 | [program:autolb]
24 | command=/usr/bin/auto-lb
25 | stdout_logfile=/var/log/supervisor/%(program_name)s.log
26 | stderr_logfile=/var/log/supervisor/%(program_name)s.log
27 | autorestart=true
28 |
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