Cooking with Chef
Sergiu Vidrascu
Who am I ?
Ce e chef???
- Infrastructure automation tool
- Target users > Dev/SYS
- Aim -> Continuosly define, build and manage infrastructure
- Model promotes reuse
- Ruby based
Overall Architecture
- Development Kit (FREE)
- Server (FREE)
- Client (Agent) (FREE)
Chef Learning Curve
My first Attempts of building a chef cookbook
Anatomia unui run de chef ??
Chef-client
build node
Sync cookbooks
Incarcarea cookbookurilor
Text
Converge
Success?
Report handles
Da
Exception Handlers
Nu
Anatomia unui run de chef ??
Chef-client
- Agentul folosit the chef
- Se poate conecta la un server sau nu
- Se poate instala pe majoritatea OS-urilor - https://downloads.chef.io/chef-client/
Chef-client
Construirea nodului:
- Ohai -> Profiling la sistemul de operare
- Autentificarea la serverul chef daca exista
- Formarea Obiectului de tip Node (attributes & run list)
build node
Anatomia unui run de chef ??
Chef-client
Syncronizarea cookbookurilor
- Se citeste fisierul metadata din cookbookurile folosite si se rezolva dependintele
- Daca run-ul e fara server trebuie sa fie totul deja pe masina
- Daca se foloseste serverul atunci se face download de pe server
build node
Sync cookbooks
Anatomia unui run de chef ??
Chef-client
build node
Sync cookbooks
Incarcarea cookbookurilor
Ordinea de incarcare:
- Libraries
- Providers
- Resources
- Attributes
- Definitions
- Recipes
Templates & cookbook files are not loaded here
Anatomia unui run de chef ??
Chef-client
build node
Sync cookbooks
Incarcarea cookbookurilor
Text
Converge
Anatomia unui run de chef ??
Chef-client
build node
Sync cookbooks
Incarcarea cookbookurilor
Text
Converge
Success?
Anatomia unui run de chef ??
Chef-client
build node
Sync cookbooks
Incarcarea cookbookurilor
Text
Converge
Success?
Report handles
Da
Anatomia unui run de chef ??
Chef-client
build node
Sync cookbooks
Incarcarea cookbookurilor
Text
Converge
Success?
Report handles
Da
Exception Handlers
Nu
Anatomia unui run de chef ??
Cum arata un cookbook + Demo
Pros:
- Templates
- Using ruby code for custom functionality
- Defining your own resources
- Brilliant Testing Capabilities out of the box
- Did i mention it's FREE
- Awesome community
- Good documentation
- Idempotency
- A lot of flexibility and control when using Chef Server
Cons / Issues I've encountered:
- Derived attributes
- Using Attributes in custom-resources
- Windows vs Linux (Boom)
- Not so Reusable resources across every platform (ex: execute)
- If not built right, quite slow, mainly because of all the downloads (dependency download) and the pure fact that it uses an agent
Q & A
Cooking with Chef
By Sergiu Vidrascu