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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>
19 lines
438 B
Django/Jinja
19 lines
438 B
Django/Jinja
# Managed by Ansible — do not edit by hand.
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# pgBackRest weekly full backup.
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[Unit]
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Description=pgBackRest full backup ({{ pgbackrest_stanza }})
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Wants=network-online.target
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After=network-online.target
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[Service]
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Type=oneshot
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User=postgres
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Group=postgres
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ExecStart=/usr/bin/pgbackrest --stanza={{ pgbackrest_stanza }} --type=full backup
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Nice=10
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IOSchedulingClass=best-effort
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IOSchedulingPriority=7
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[Install]
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WantedBy=multi-user.target
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