Motivation
We want to ship our working software to different places in a painless way
Main problems
- Moving from development to production is hard!
- Conflicting libraries / different versions
- Different Operating Systems
- Different versions of databases
- ...
- Creating, updating and mantaining the full software stack is hard!
- A project usually contains many libraries, databases, services...
- Hard to keep a reproducible version of a project
- Testing / Continuous integration / Continuous deployment is hard to automate!
How to solve it (DIY)
Do-It-Yourself!
- 1- Copy/install dependencies (manually/scripts)
- 2- Prepare databases
- 3- Install the latest version of the project
- 4- Configure properties
- 5- Try it!
- 6- Ouch! something is missing, it does not work!
- 7- Fix errors
- 8- Repeat again until everything is working
- 9- Write manuals to help other people configuring the whole monster
How to solve it (Virtual Machines)
Package everything in a VM and deploy it in different environments
VM - Disadvantages
- Heavy. How many VMs can you run in your laptop?
- Overhead. Full virtualized OS (I/O, resources...)
- Size. Usually many GBs for each VM
- Portability problems. Different virtualization solutions
- Management. Hard to mantain / config / reuse different versions of each VM
Management problems can be solved with Vagrant, Chef, Puppet...
How to solve it (Docker)
Package everything in LXC containers
Docker vs Virtual Machines
The Docker System
Online docker tutorial
