Microservices-based application in PHP with Fig and Silex

This is a sample implementation of a microservices-style Silex application, using Docker for management and Fig for service orchestration.

What it does is just show the number of visits to its root URL, using Redis to count them. Thus, the app is composed of two main services: A PHP server which takes code from the host and serves it (using the embedded PHP web server) and a Redis one.

The PHP app container is built from the included Dockerfile, while the Redis container is taken from the Docker registry.

Requirements

• Docker (Linux) or Boot2Docker (Mac OS) >= 1.3
• Fig >= 1.0

Install

1. Clone sample project (note that, in Mac OS X, it must be cloned inside Users as it won't work anywhere else due to a current Boot2docker limitation)

   git clone https://github.com/svera/fig-silex
   
   cd fig-silex
   

2. Build app infrastructure
   fig up (or fig up -d to run in background)

3. Check out VM exposed IP (Boot2docker only) boot2docker ip

4. Go to your web browser and type
   http://<VM exposed IP>:8000 (Mac OS) or
   http://localhost:8000 (Linux)

Troubleshooting

• If you already have VirtualBox installed, it is better to install Boot2Docker-cli >= 1.3 and use it to download boot2docker.iso with boot2docker download
• If the fig up step fails with a Couldn't connect to Docker daemon at http+unix://var/run/docker.sock - is it running? message, do the following (Linux only)

  • Change the DOCKER_OPTS in /etc/default/docker to:
    DOCKER_OPTS="-H tcp://127.0.0.1:4243 -H unix:///var/run/docker.sock"

  • Restart docker
    sudo restart docker

  • Make sure that docker is running on localhost:4243

    $ netstat -ant  |grep 4243
    tcp        0      0 127.0.0.1:4243          0.0.0.0:*               LISTEN
    

  • Set DOCKER_HOST (.bashrc)
    export DOCKER_HOST=tcp://localhost:4243