Immutable Software Deploys Using ZFS Jails on FreeBSD

The article discusses how to deploy immutable software using ZFS jails on FreeBSD, leveraging ZFS snapshots and jails for instant rollbacks, zero-downtime upgrades, and reproducible environments. It outlines the prerequisites, architecture overview, configuring the jails host server, building base image templates, creating new jails, setting up services within jails, and deploying new jails with Caddy as a reverse proxy. The process involves creating new jails from ZFS clones, configuring jails, setting up services, and updating Caddy configurations to switch to new jails, providing zero-downtime upgrades and a predictable environment.