Reconsidered after the shared-MariaDB design's real cost became clear:
Kopia's generic backup (services/backup.sh) stops a service's
container to snapshot it, so a shared MariaDB instance would back up
-- and would have to be restored -- as one unit covering every site at
once. Restoring just one site's database to an earlier point meant
restoring the whole shared snapshot to a temporary location first and
manually extracting that site's data back out, not a direct restore.
Each site now gets its own dedicated MariaDB container embedded in its
own docker-compose.yml (same pattern as services/nextcloud.sh) instead
of registering a database on a shared instance:
- Removed _wordpress_ensure_shared_db() and the wordpress-db/
wordpress_net shared resources entirely.
- Each site's compose file gets a `db` service (container
<site>-db) on an explicitly-named per-site default network
(<site>_net), so wp-cli's one-off container reliably joins the
right network without depending on Docker Compose's implicit
naming convention.
- DB creation goes through the mariadb image's own MYSQL_DATABASE/
MYSQL_USER/MYSQL_PASSWORD env vars on first boot (same as
nextcloud.sh) instead of an imperative `docker exec mysql -e
"CREATE DATABASE..."` against a shared container.
- Root and site DB passwords are both reused across reruns (read from
the existing .env), verified via a real update-mode rerun.
Tradeoff, stated in both the script's header comment and the generated
per-site README: more RAM per site (~100-150MB for a full MariaDB
container instead of a slice of one shared instance) in exchange for
independent backup/restore. Data was already fully isolated either way
(separate database + user, always required since WordPress's schema
uses generic table names) -- the shared-vs-dedicated choice was only
ever about the container/process, not the data.
Re-verified end-to-end against the fake docker shim: distinct ports,
distinct dedicated DB containers/networks per site, correct compose/
.env structure, credentials preserved across an update-mode rerun.
docs/vps-sizing-recommendations.md: updated to match -- WordPress
capacity recomputed for dedicated-per-site MariaDB (~580MB headroom at
4 sites, ~976MB at 2, vs. the shared design's ~700MB/~950MB).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TBtExJcqxnokyZZKmphdug
Claude
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