this post was submitted on 31 Jan 2024
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Any configuration coded in, for example, Python 3.12, will cease to be useful in October of 2028, when it will become quite difficult to find an active useable Python 3.12 runtime.
https://endoflife.date/python
Whereas the same configuration, in an Ansible Playbook, will likely continue to function just fine, under the latest Anbile and Python versions.
I've experienced this rodeo enough times that I trust Domain Specific meta-languages much more than direct program code, for configuration.
On the XKCD, yeah. It's a joke. Randal Munroe isn't actually advocating to stop trying to fix our standards.
I refer to it here as a reminder that there will always be fatigue with each new RFC, and that's okay.
Also, not every RFC will turn out as timeless and eternally useful as RFC 2324 And there's no excuse for my bringing it up here, except that I like it.
What about using standard shell or bash? I know they are not easy to use correctly, but at least they won't break every few years.
Great question!
Bash (on vanilla Linux) lacks functionality to verify each change after making it.
(Edit: For configuration drift detection, which I need in various contexts.)
Yes, I can verify each change I make, but it's a huge pain in the ass in Bash. And in my experience, there's a 100% chance the next person to update the config won't understand that they need to update the matching verify step.
In contrast, in Ansible, every step has "modify" and "verify" modes built-in. If I change the "modify" step, the next "verify" run will be correct, automatically, because one config line defines both.
The closest thing in any shell, that I am aware of is "Desired State Config", which currently only supports PowerShell. It currently leaves a lot to be desired. Configs in v1 and v2 are live code, which causes problems. But version 3 (currently in alpha) of Desired State Config looks quite promising (and is already designed to be an extension of Ansible and other orchestration engines.)
DSC, if it becomes an RFC, could become the best of both worlds. I dream of doing DSC in my preferred shell, to get started, then dumping those configs on a full scale orchestration pull-server, when I need it.
Edit: So many typos.
Not sure I really understand the issue here. Is it about installing or modifying parts of existing config files? I try to use config.d facilities as much as possible for this problem.
"Configuration drift" is when someone (often myself, in a moment of inattention) manually changes things from how I want them.
I need to keep drift to a minimum, because I often build machines that are extremely similar to the previous build - and I won't remember the manual change next time, unless I detect the drift and correct it in my configuration management solution.