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| author | Franck Cuny <franckcuny@gmail.com> | 2016-07-31 10:16:40 -0700 |
|---|---|---|
| committer | Franck Cuny <franckcuny@gmail.com> | 2016-07-31 13:42:48 -0700 |
| commit | 63f413891d5adc596e4d51dfba4d0d23fdea3ca4 (patch) | |
| tree | c2726b60515057a20f434bd89c596360ef17852b /posts/2012-11-27-ansible-and-chef.md | |
| parent | Add Google Analytic tracker. (diff) | |
| download | lumberjaph-63f413891d5adc596e4d51dfba4d0d23fdea3ca4.tar.gz | |
Stop generating a static site.
Diffstat (limited to 'posts/2012-11-27-ansible-and-chef.md')
| -rw-r--r-- | posts/2012-11-27-ansible-and-chef.md | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/posts/2012-11-27-ansible-and-chef.md b/posts/2012-11-27-ansible-and-chef.md new file mode 100644 index 0000000..1c9c1b1 --- /dev/null +++ b/posts/2012-11-27-ansible-and-chef.md @@ -0,0 +1,85 @@ +I've been using [Chef](http://www.opscode.com/chef/) for some time now, but it was always via [Vagrant](http://vagrantup.com), +so a few weeks ago I decided to get more familiar with it. A friend +of mine had set up a Chef server for his own use and was OK to let me use +it for my personal server. There was a four days weekend for Thanksgiving +coming, so it was the perfect occasion to take a better look at it, +and to re-install my Linode server with Chef. And since it was a +really long weekend, I also decided to take a look at [ansible](http://ansible.cc), another +tool to push stuff to your server. + +I'm not going to talk about installation, configuration, set up and +all that kind of stuff, there's enough material available around (blog +posts, articles, books, etc). Instead, I will talk about my +experience and share my (very valuable) opinion (because, clearly, the +world deserve to know what I think). + +## Writing cookbooks for Chef + +For the few of you who don't know, cookbooks, in Chef's world, are a +group of files (templates, static files) and code that are used to +automate your infrastructure. Usually, you'll create a cookbook for +each of your application (one for nginx, one for MySQL, etc). + +I've a few services on my server (git, gitolite, Jenkins, graphite, +collectd, phabricator, ...), and I wanted a coobook for each of them. +I've started by looking for the one already existing (there's a lot of +them on GitHub, on the +[opscode's account](https://github.com/opscode-cookbooks/)), and I tried to use +them without any modification. Usually, a cookbook will let you set +some configuration details in your role or node to override the +defaults it provides (like +the password for MySQL, or the path where to put logs). So what I did +was to set the interesting cookbook as a git submodule in my cookbook +repository. Unfortunately, for almost all of them, I had to give up +and import them in the repo, so I could edit and modify them. + +That's probably my biggest complaint with cookbooks: I doubt code +re-usability is possible. You can use a cookbook as a base for your +own version, but either they are too generic; or sometimes you need a +workaround; or they do way too many things. And as a result, you need to edit the +code to make them behave the way you want. + +In my opinion, developers/ops should just publish [LWRP](http://docs.opscode.com/essentials_cookbook_lwrp.html) (Lightweight +Resources and Providers) and templates, that's the only thing that I +can see as really re-usable (take a look at +[perl-chef](https://github.com/dagolden/perl-chef), I think that this one is a good +example). + +## Using ansible + +ansible was a new tool for me. A few friends mentionned it to me last +October when I was at the [OSDC.fr](http://osdc.fr) and it was also suggested to me by a +colleague at work. + +This tool is definitely less known that Chef, so I'll give a quick +introduction. In ansible world, you write "playbooks", which are the +orchestration language for the tool. That sounds very similar with +Chef, but the main difference is they are not actual code, but a +scenario with actions. + +On the web site of the project, there's a quote saying: + +> You can get started in minutes. + +and for once, that's true. I only had to read the first page of the +documentation, and I was able to write a very simple playbook that I +was able to evolve very quickly to do something actually useful. + +Another difference with Chef is that they don't incite you to share +your playbooks, but instead to share your modules. Modules could be +compared to Chef's LWRP. They are Python code to do something +specific (like the [`pip`](http://ansible.cc/docs/modules.html#pip) module, to install Python package, or the +[`template`](http://ansible.cc/docs/modules.html#template)'s one). + +## Chef vs Ansible + +For now, I've decided to stick to this: use Chef for my supporting +application (nginx, MySQL, etc) and ansible for my own applications. + +So far, I prefer ansible to Chef. There's definitely less available +material about ansible on the net, but the quality is better, and the +main documentation is very (I insist on the *very*) well organized. I've never spend more than +10 minutes looking for something and to implement it. I can't say +the same with Chef: the wiki is confusing; there's way too many +cookbooks available; their quality is very disparate. + |
