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Erlang based Chef Server top-level OTP release project
Erlang Shell Perl Ruby

README.md

Erchef: The Opscode Chef Server

Overview

How to Build a deb package using omnibus-chef-server

You will need:

  1. Create an omnibus.rb config file:

    cd omnibus-chef-server
    cp omnibus.rb.example omnibus.rb
    # edit and set use_s3_caching to false
    
  2. Install gem dependencies (assumes you already have a recent Ruby and bundler gem installed):

    bundle install --binstubs
    
  3. Build a deb package:

    # list available package types
    bin/vagrant status
    
    # build a deb
    bin/vagrant omnibus build ubuntu-10.04 chef-server
    

    Wait patiently. The omnibus builder will download and compile 33.4% of one internet.

    The installer can be found in the pkg directory of your omnibus-chef-server checkout.

How to Hack on Erchef

Before working on the code, if you plan to contribute your changes, you need to read the Opscode Contributing document.

Required software

  1. GNU Make
  2. git
  3. Ruby (rubygems and bundler are also needed)
  4. Erlang R15B01 or greater

Obtaining source repositories

  1. Install a recent chef gem

    gem install chef --no-ri --no-rdoc
    
  2. The clone_for_dev make target will use chef-solo to obtain git checkouts of relevant repositories. By default it will clone using the read-only git URL:

    mkdir chef-server
    cd chef-server
    git clone git@github.com:opscode/erchef.git
    cd erchef
    make clone_for_dev
    

    The repositories will be created as peers to the erchef directory.

Building erchef

You can build the OTP release for Erchef as follows:

cd erchef
make rel

Reporting Bugs

You can search for known issues in Opscode Chef's bug tracker. Tickets should be filed under the CHEF project with the component set to "Chef Server".

A tour of the erchef repositories

A picture is worth some words!

erchef component diagram

  • erchef: The top-level erchef repository is used to build self-contained OTP releases of erchef. You can build a OTP release of erchef by running make rel in the erchef directory. This will download all dependencies, compile Erlang code, and put (almost) everything needed into rel/erchef. What isn't included? Configuration for erchef is handled by omnibus installer (omnibus-chef-server) which is also responsible for installing and configuring all of the supporting components of the Chef Server.

  • chef_wm: The "wm" stands for webmachine. This OTP application contains the core of the erchef REST API implemented on top of the Webmachine toolkit. The URL routing that matches URLs with Erlang modules handling requests for those URLs is defined in priv/dispatch.conf. The README file in that repo has a more detailed overview.

  • chef_objects: Contains Erlang type definitions for core Chef objects and serialization code for going between the Erlang representation and JSON.

  • chef_authn: Implements Chef's HTTP request signing and verification protocol. This library can be leveraged to build Erlang-based client tools that interact with the Chef Server or new server add-ons that need to authenticate requests as erchef does.

  • chef_index: Handles erchef's interaction with Solr and the RabbitMQ queue used to for the indexing data flow.

  • chef_db: All of erchef's interaction with the RDBMS goes through chef_db. The base schema and prepared queries can be found in the priv directory of this project. This project uses sqerl as a light-weight RDBMS abstraction layer and pooler for database connection pooling.

  • chef_certgen: Used to generate RSA key pairs and X.509 certificates. Includes a small NIF library that wraps OpenSSL code to support Chef's desired formats.

  • depsolver: A backtracking dependency solver for resolving cookbook version dependencies.

  • fast_log: A simple logging library. We intend to revisit this and will likely replace fast_log with lager.

  • stats_hero: Supports aggregating metrics at the HTTP request level, sending to a StatsD server over UDP, and providing request-level metrics for request logging.

Release tagging and branch management

Releases are tagged off of the master branch using git annotated tags (git tag -a x.y.z).

Erchef uses the rebar_lock_deps_plugin to create a rebar.config.lock file that lists all dependencies locked to a git SHA. This allows builds of erchef to be reproducible.

All erchef code lives in supporting repositories; the rebar.config.lock file must be updated to pull in new code. You can update the lock file and bump the OTP release version number like this:

make prepare_release

The prepare_release target takes the following actions:

  1. remove all local deps via make distclean

  2. fetch all dependencies without using the lock file. This is where new code is brought in.

  3. Run the lock-deps plugin to regenerate the rebar.config.lock file based on the git SHAs of the local dependencies fetched in step 2.

  4. Bump the "z" version in rel/reltool.config. Depending on the changes being pulled in, you may need to make a larger version bump to conform with semver.

You can trigger a commit of the updated rebar.config.lock file and rel/reltool.config along with a formatted summary of changes in the deps using the following rebar command provided by the rebar_lock_deps_plugin (and already included in erchef deps):

rebar commit-release

If this is a known good build, you can generate a standard tag based on the version found in rel/reltool.config like so:

rebar tag-release

The changes made by prepare_release can be pushed to a feature branch for integration testing prior to merging to master.

License

Copyright: Copyright (c) 2011-2012 Opscode, Inc.
License: Apache License, Version 2.0

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

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