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I migrated my bare-metal Debian 12 webserver used in production to an Alma 10 VM hosted on Proxmox and Dockerized key services I migrated my bare-metal Debian 12 webserver used in production to an Alma 10 VM hosted on Proxmox and Dockerized key services
The migration was automated with Ansible and the downtime was mere seconds with zero data loss The migration was orchestrated with Ansible and the downtime limited to seconds, with zero data loss
The entire environment is now reproducable from a fresh Linux install The entire environment is now reproducible from a fresh Linux install
## Successfully migrated
- OS: Debian 12 -> AlmaLinux 10
- Web stack: Nginx/PHP/static website, updated all relevant config files for a RHEL-based distro
- Services: Gitea, Calibre, Jellyfin, all Dockerized with SQL databases ported
- Firewall: UFW -> firewalld
- Updates: unattended upgrades -> dnf-automatic, security only
- Mail: ssmtp -> msmtp
- Packages: apt -> dnf
- Certificates: certbot
- Storage: fstab
- Configs: SSH, Cron, MOTD
- Users: home directories and files preserved
- Custom scripts: rewritten and modified
## Motivation ## Motivation
@@ -32,23 +47,9 @@ My intent was to minimize the downtime as much as possible for the services I an
This goal was successfully met as the only downtime tobiastime faced was the time it took me to point the port forwarding on my router to a different backend IP This goal was successfully met as the only downtime tobiastime faced was the time it took me to point the port forwarding on my router to a different backend IP
## Successfully migrated
- OS: Debian 12 -> AlmaLinux 10
- Web: Nginx/PHP/static website, updated all relevant config files for a RHEL-based distro
- Services: Gitea, Calibre, Jellyfin, all Dockerized with SQL databases ported
- Firewall: UFW -> firewalld
- Updates: unattended upgrades -> dnf-automatic, security only
- MTA: ssmtp -> msmtp
- TLS: certbot
- Disks: fstab
- Configs: SSH, Cron, MOTD
- Users/home directories
- Custom scripts (rewritten/modified)
## Server Migration Methodology ## Server Migration Methodology
Initially I cloned my Debian drive with dd to serve as a perpetual, virtualized, reference point Initially I created a full Debian disk clone with dd to preserve a reference point for the original system
I installed an AlmaLinux VM, and created a snapshot of the fresh install I installed an AlmaLinux VM, and created a snapshot of the fresh install