Initial commit, with README and deploy script

README.md

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+# App server configuration
+
+This repository contains the running configuration files for App server's services (containers).
+
+## Use
+* all modifications to services' configurations should be done in this repository and then deployed
+(see [below](#deployment))
+* then, after it's been tested and validated, a change can be commit and pushed
+* this way, it is easy to revert to last working state
+
+### Deployment
+Script `deploy.sh` copies configuration files for selected or all of below services, and then reloads Systemd and
+restarts said services.
+
+## Services
+
+### Nspawn containers
+We use Systemd Nspawn containers to host our applications. They reside in standard directory `/var/lib/machines`,
+each mounted from a BTRFS subvolume (see [this repository](https://gitea.kto.black/adminconf/containers) for more
+details). These containers' configuration thus reside in 2 places:
+* `fstab` lists the subvolumes to mount
+* `/etc/systemd/nspawn/` contains each container's configuration file