Deploy and Scale your PHP App with AWS ElasticBeanstalk and Docker- PHPTour Luxembourg 2015

Deploy and Scale your PHP App using
Docker containers and AWS Beanstalk
Walter Dal Mut
@walterdalmut - github.com/wdalmut

I'm co-founder of @CorleyCloud
application development
infrastructure and application migration on cloud
I'm also a co-founder of @UpCloo
U.K. based startup: powering related content across the web
walter.dalmut@gmail.com

First of all we have to agree on
what scaling is for this talk

scalability is not high availability
Scalability is the ability of a system to handle a growing amount of work in capable manner or the ability to be
enlarged to accomodate that growth (from wikipedia)

From single instances point of view

It is also meaning that with fixed hardware
we have to provide the highest computing capacity

About ElasticBeanstalk
Load Balanced web applications
Single instance web applications
Queue daemons (SQS)

Load balanced web applications

thresholds are used to
create and remove instances

with (auto)scalable infrastructures
How to manage application upgrades
How to monitor servers
How to handle servers configurations
How to handle instances logs
...
ElasticBeanstalk help us with this things

Mainly Beanstalk takes a ZIP artifact
(the PHP application)
and unpack it into the environment
Uses YML definitions in order to setup the environment

The deploy cycle take care of:
1. Packages
2. Users & Groups
3. Files
4. Commands
before the application and web server are set up
5. Services
6. Container_commands
just before the application version is deployed

Configure PHP details
files:
  "/etc/php.d/mytimezone.ini" :
    mode: "000644"
    owner: root
    group: root
    content: |
      date.timezone = Europe/Rome
You can also use beanstalk options

extract your application logs
commands:
    21_application_logs:
        command: echo "/var/app/current/app/logs/*.log" > app.conf
        cwd: /opt/elasticbeanstalk/tasks/bundlelogs.d
        cwd: /opt/elasticbeanstalk/tasks/systemtaillogs.d
        cwd: /opt/elasticbeanstalk/tasks/taillogs.d
        cwd: /opt/elasticbeanstalk/tasks/publishlogs.d
And check them directly from the web console

Beanstalk works with different
application containers
PHP, Node.js, Tomcat, Python, Ruby
and...
Docker & Multicontainer Docker
Multicontainer Docker is connected to ElasticContainer Service

Why docker is interesting for
ElasticBeanstalk?
When there is a default PHP container with
different available versions: 5.3, 5.4, 5.5, 5.6

Instances are Amazon Linux
Difficult to configure a different distro: ubuntu, debian ...
Even packages: supervisors, agents etc.
Difficult to replicate the env locally (dev).

Default PHP container configuration
{{ Apache - MOD_PHP }}

The application path change
after the deploy cycle
/var/app/ondeck->/var/app/current
Symfony2 cache warmup problems...

With Docker we can create a more
dedicated setup
{{ Nginx - PHP-FPM }}

The docker environment is more stable
and testable than the default one
Thanks to the docker isolation nature
File are uncompressed into: /var/app/current

Prepare a web server
FROM ubuntu:14.04
RUN aptget update && aptget install y php5 apache2 libapache2modphp5
php5apcu php5curl php5mongo php5xsl && rm rf /var/lib/apt/lists/*
RUN a2enmod rewrite deflate expires headers
EXPOSE 80
CMD ["/usr/sbin/apache2ctl", "D", "FOREGROUND"]
prepare your Dockerfile

You can build the container during the
deploy cycle
Just let the `Dockerfile` in the root folder of your project

dockerbuild-twdalmut/webserver.
dockerpush

Docker containers are engaged with:
https://registry.hub.docker.com/
+ automated builds! (keep container up to date automatically)
Already provisioned containers

You can use it
for your development
dockerpullwdalmut/webserver
dockerrun
  -p8080:80
  -v`pwd`:/var/www/html
  -dwdalmut/webserver
Use Vagrant docker provisioner for your dev environments

Same environment in ElasticBeanstalk
Dockerrun.aws.json
{
  "AWSEBDockerrunVersion": "1",
  "Image": {
    "Name": "wdalmut/webserver",
    "Update": "true"
  },
  "Ports": [
    {
      "ContainerPort": "80"
    }
  ],
  "Volumes": [
    {
      "HostDirectory": "/var/app/current",
      "ContainerDirectory": "/var/www/html"
    }
  ],
  "Logging": "/var/log/app"
}

Beanstalk proxies
with nginx
your first exposed port
80->EXPOSE*****[,******]

Ok, we have the infrastructure
And about the application setup?

App tuning with environment variables
<?php
$env=getenv("SYMFONY__ENV");

download config files from S3
Resources:
    AWSEBAutoScalingGroup:
        Type: "AWS::AutoScaling::AutoScalingGroup"
        Metadata:
            AWS::CloudFormation::Authentication:
                S3AccessCred:
                    type: "S3"
                    roleName: "awselasticbeanstalkec2role"
                    buckets: "myappdeploy"
files:
    "/root/parameters.yml":
        mode: "000400"
        owner: root
        group: root
        source: https://s3euwest1.amazonaws.com/myappdeploy/parameters.yml
container_commands:
     01_copy_configuration:
         command: cp /root/parameters.yml app/config/parameters.yml
remember that EC2 IAM roles should be configured correctly

EC2 Role configuration
{
    "Version": "20121017",
    "Statement": [
        {
            "Sid": "Stmt1305192283000",
            "Effect": "Allow",
            "Action": [
                "s3:*"
            ],
            "Resource": [
                "arn:aws:s3:::appdeploy/",
                "arn:aws:s3:::appdeploy/*"
            ]
        }
    ]
}
Could be more detailed and restricted than this example

You cannot use PHP from the host
(it is in the docker container)...
You have to pass commands via docker containers
dockerrun
  --rm-i-t
  -v/var/app/current:/var/www/html
  wdalmut/webserver
  app/consoleca:cl-e=prod

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