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+---
+title: "A home server journey, part 5: Ansible"
+date: 2025-12-26
+description: |
+  This is the fifth episode in a series where I set up a FreeBSD home server, explaining all the steps, problems and solutions along the way. This time we're provisioning the server with Ansible.
+extra:
+  kind: note
+---
+
+This is the fifth episode in a series where I set up a FreeBSD home server, explaining all the steps, problems and solutions along the way. This time we're provisioning the server with Ansible.
+
+Check out episodes [1](../archive/home-server-part-1), [2](../archive/home-server-part-2), [3](../archive/home-server-part-3), [4](../archive/home-server-part-4).
+
+{{ toc() }}
+
+## Automation
+
+[Ansible](https://docs.ansible.com/projects/ansible/latest/index.html) is a tool for running a bunch of Python scripts, or "tasks", in a kind of declarative way. It's commonly used for provisioning servers.
+
+My ansible configuration is publicly available on my GitHub. I update it regularly.  
+🌐 [jantuomi/ansible-freebsd-home-server](https://github.com/jantuomi/ansible-freebsd-home-server)
+
+I have only one server, and I'm planning to have it for a long time. Why would I need automated provisioning? It seems like an extra step when I could just provision everything manually. There is no need to synchronise multiple hosts or anything like that.
+
+I view this kind of automation as executable documentation, or readable instructions for both the computer and the human. If I define the server in terms of these Ansible tasks, I can (in theory) reconstruct what's been done with the server just by reading the Ansible playbook.
+
+To be reliable, this necessitates that everything is defined in Ansible. Which happens to be very difficult to actually do.
+
+## Project structure
+
+There are many ways to structure an Ansible project. I picked one that I consider to be simple:
+
+- a single main playbook, with tags for selective execution of sub-playbooks
+- a non-tracked `secrets.yml` that contains all secret values
+  - reasoning: this way I don't need to parse a separate configuration format and I get access to all features of YAML, including its data structures (lists, objects), which I would be lacking if I used a flat file format such as `.env`.
+- a flat file hierarchy with names mirroring the target path, e.g. `templates/root_ssh_config.j2` goes to `/root/ssh/config`.
+- no handlers and notify, because I want complete control over the execution order
+
+This is my first non-trivial Ansible project, so I wouldn't be surprised if I have some anti-patterns in there.
+
+The playbooks are designed to be fully _idempotent_: I can run the playbook again after the first run and expect the system to be in the same state. This is very important, since I want to be able to fearlessly run any playbook at any time and expect a success, or at least a helpful failure that doesn't compromise basic operation of the host.
+
+The only host in the Ansible inventory is my server. I run the playbook like this from my development laptop:
+
+```sh
+$ ansible-playbook -i inventory playbook.yml
+```
+
+If I want to only update the `ingress` jail, I run:
+
+```sh
+$ ansible-playbook -i inventory playbook.yml -t jail_ingress
+```
+
+## Separation of responsibilities
+
+Let's borrow and tweak the standard cloud infrastructure stack diagram that shows what parts of the stack are handled by the cloud provider and what parts are handled by the customer.
+
+My current approach is to use Ansible for the "core" parts of server administration, installing packages, defining service jails, etc:
+
+{{ fig(src="pursotin_stack.svg", alt="A stack model depicting the software layers in my server") }}
+
+Some notes about this setup:
+
+- The top "application layer" is currently a chaotic no-man's-land with varying levels of automation. Optimally I could rebuild all service jails completely with Ansible.
+- The host OS release is managed manually, i.e. release upgrades are run manually with `freebsd-update`. This is fine IMHO. I will be supervising all the few and in between OS upgrades anyway, so automation does not help much there.
+
+## Why not Chef, Salt, etc?
+
+Ansible is very simple. It's pretty much a framework to write idempotent shell scripts without having to write shell scripts. Or Python scripts, whichever way you want to look at it.
+
+It's agentless. I don't have to run a service on the FreeBSD host to use Ansible. It uses SSH as transport and runs the tasks with Python, both of which are software that I expect to be present on any \*nix server.
+
+{{ fig(src="ansible_task_postgres.png", alt='A snippet of Ansible playbook installing PostgreSQL in the "postgres" jail') }}
+
+## How about containers?
+
+I'd image that most new server setups in 2025 are designed with container workloads in mind. This one is too, kinda.
+
+I isolate most services with FreeBSD jails, which are similar to OCI containers. Processes are isolated from other jails and the host automatically. Virtual networking (`vnet`) isolates the network. ZFS snapshots and clones provide thin jail filesystems that have a small storage footprint. Jails share the host kernel.
+
+Many OCI container concepts translate well to jails, but jails are somewhat more _persistent_. Conventionally, jail filesystems are not ephemeral and survive jail restarts.
+
+Only `ssh`, `bash`, `vim` and some other packages are installed on the host directly. Everything else is 🔐 _incarcerated_ 🔐.
+
+{{ fig(src="pursotin_jls.png", alt='A list of running jails on the server') }}
+
+### FreeBSD OCI container support
+
+FreeBSD was [recently welcomed](https://forums.freebsd.org/threads/an-introduction-to-oci-containers-on-freebsd.99907/) into the prestigious club of platforms that can run OCI containers. This was achieved by using jails as the container runtime and `podman` as container manager.
+
+This pretty much means that we can use Dockerfiles/Containerfiles to define our jails. Existing Containerfiles cannot be used directly, since they are built on Linux base images, but they can be used as a starting point for building new, FreeBSD-based images.
+
+While this sounds very cool and promising, I want to let the implementation mature a bit before building everything on it.
+
+> I tried installing the `podman-suite` package and following the instructions, and promptly broke all of my networking, so yeah 😑
+
+I'm sure OCI containers will be a valid and respectable approach to containerization on FreeBSD, after the kinks have been ironed out.
+
+## To be continued
+
+In the next part(s) we will be looking at the specifics of the jail setup, e.g. how to create jails using `jail.conf.d` scripts.
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