veza/infra/ansible/roles/pgbackrest/templates/pgbackrest-diff.timer.j2

# Managed by Ansible — do not edit by hand.
# Daily differential backup trigger.

[Unit]
Description=pgBackRest diff backup timer ({{ pgbackrest_stanza }})
Requires=pgbackrest-diff.service

[Timer]
OnCalendar={{ pgbackrest_schedule_diff }}
Persistent=true
RandomizedDelaySec=300
Unit=pgbackrest-diff.service

[Install]
WantedBy=timers.target
feat(infra): pgbackrest role + dr-drill + Prometheus backup alerts (W2 Day 8) ROADMAP_V1.0_LAUNCH.md §Semaine 2 day 8 deliverable: - Postgres backups land in MinIO via pgbackrest - dr-drill restores them weekly into an ephemeral Incus container and asserts the data round-trips - Prometheus alerts fire when the drill fails OR when the timer has stopped firing for >8 days Cadence: full — weekly (Sun 02:00 UTC, systemd timer) diff — daily (Mon-Sat 02:00 UTC, systemd timer) WAL — continuous (postgres archive_command, archive_timeout=60s) drill — weekly (Sun 04:00 UTC — runs 2h after the Sun full so the restore exercises fresh data) RPO ≈ 1 min (archive_timeout). RTO ≤ 30 min (drill measures actual restore wall-clock). Files: infra/ansible/roles/pgbackrest/ defaults/main.yml — repo1-* config (MinIO/S3, path-style, aes-256-cbc encryption, vault-backed creds), retention 4 full / 7 diff / 4 archive cycles, zstd@3 compression. The role's first task asserts the placeholder secrets are gone — refuses to apply until the vault carries real keys. tasks/main.yml — install pgbackrest, render /etc/pgbackrest/pgbackrest.conf, set archive_command on the postgres instance via ALTER SYSTEM, detect role at runtime via `pg_autoctl show state --json`, stanza-create from primary only, render + enable systemd timers (full + diff + drill). templates/pgbackrest.conf.j2 — global + per-stanza sections; pg1-path defaults to the pg_auto_failover state dir so the role plugs straight into the Day 6 formation. templates/pgbackrest-{full,diff,drill}.{service,timer}.j2 — systemd units. Backup services run as `postgres`, drill service runs as `root` (needs `incus`). RandomizedDelaySec on every timer to absorb clock skew + node collision risk. README.md — RPO/RTO guarantees, vault setup, repo wiring, operational cheatsheet (info / check / manual backup), restore procedure documented separately as the dr-drill. scripts/dr-drill.sh Acceptance script for the day. Sequence: 0. pre-flight: required tools, latest backup metadata visible 1. launch ephemeral `pg-restore-drill` Incus container 2. install postgres + pgbackrest inside, push the SAME pgbackrest.conf as the host (read-only against the bucket by pgbackrest semantics — the same s3 keys get reused so the drill exercises the production credential path) 3. `pgbackrest restore` — full + WAL replay 4. start postgres, wait for pg_isready 5. smoke query: SELECT count() FROM users — must be ≥ MIN_USERS_EXPECTED 6. write veza_backup_drill_ metrics to the textfile-collector 7. teardown (or --keep for postmortem inspection) Exit codes 0/1/2 (pass / drill failure / env problem) so a Prometheus runner can plug in directly. config/prometheus/alert_rules.yml — new `veza_backup` group: - BackupRestoreDrillFailed (critical, 5m): the last drill reported success=0. Pages because a backup we haven't proved restorable is dette technique waiting for a disaster. - BackupRestoreDrillStale (warning, 1h after >8 days): the drill timer has stopped firing. Catches a broken cron / unit / runner before the failure-mode alert above ever sees data. Both annotations include a runbook_url stub (veza.fr/runbooks/...) — those land alongside W2 day 10's SLO runbook batch. infra/ansible/playbooks/postgres_ha.yml Two new plays: 6. apply pgbackrest role to postgres_ha_nodes (install + config + full/diff timers on every data node; pgbackrest's repo lock arbitrates collision) 7. install dr-drill on the incus_hosts group (push /usr/local/bin/dr-drill.sh + render drill timer + ensure /var/lib/node_exporter/textfile_collector exists) Acceptance verified locally: $ ansible-playbook -i inventory/lab.yml playbooks/postgres_ha.yml \ --syntax-check playbook: playbooks/postgres_ha.yml ← clean $ python3 -c "import yaml; yaml.safe_load(open('config/prometheus/alert_rules.yml'))" YAML OK $ bash -n scripts/dr-drill.sh syntax OK Real apply + drill needs the lab R720 + a populated MinIO bucket + the secrets in vault — operator's call. Out of scope (deferred per ROADMAP §2): - Off-site backup replica (B2 / Bunny.net) — v1.1+ - Logical export pipeline for RGPD per-user dumps — separate feature track, not a backup-system concern - PITR admin UI — CLI-only via `--type=time` for v1.0 - pgbackrest_exporter Prometheus integration — W2 day 9 alongside the OTel collector Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> 2026-04-27 22:51:00 +00:00			`# Managed by Ansible — do not edit by hand.`
			`# Daily differential backup trigger.`

			`[Unit]`
			`Description=pgBackRest diff backup timer ({{ pgbackrest_stanza }})`
			`Requires=pgbackrest-diff.service`

			`[Timer]`
			`OnCalendar={{ pgbackrest_schedule_diff }}`
			`Persistent=true`
			`RandomizedDelaySec=300`
			`Unit=pgbackrest-diff.service`

			`[Install]`
			`WantedBy=timers.target`