c941aba3d2
Some checks failed
Veza CI / Notify on failure (push) Blocked by required conditions
Veza CI / Rust (Stream Server) (push) Successful in 3m45s
Security Scan / Secret Scanning (gitleaks) (push) Successful in 1m0s
Veza CI / Backend (Go) (push) Successful in 5m38s
Veza CI / Frontend (Web) (push) Has been cancelled
E2E Playwright / e2e (full) (push) Has been cancelled
ROADMAP_V1.0_LAUNCH.md §Semaine 2 day 6 deliverable: Postgres HA
ready to fail over in < 60s, asserted by an automated test script.
Topology — 3 Incus containers per environment:
pgaf-monitor pg_auto_failover state machine (single instance)
pgaf-primary first registered → primary
pgaf-replica second registered → hot-standby (sync rep)
Files:
infra/ansible/playbooks/postgres_ha.yml
Provisions the 3 containers via `incus launch images:ubuntu/22.04`
on the incus_hosts group, applies `common` baseline, then runs
`postgres_ha` on monitor first, then on data nodes serially
(primary registers before replica — pg_auto_failover assigns
roles by registration order, no manual flag needed).
infra/ansible/roles/postgres_ha/
defaults/main.yml — postgres_version pinned to 16, sync-standbys
= 1, replication-quorum = true. App user/dbname for the
formation. Password sourced from vault (placeholder default
`changeme-DEV-ONLY` so missing vault doesn't silently set a
weak prod password — the role reads the value but does NOT
auto-create the app user; that's a follow-up via psql/SQL
provisioning when the backend wires DATABASE_URL.).
tasks/install.yml — PGDG apt repo + postgresql-16 +
postgresql-16-auto-failover + pg-auto-failover-cli +
python3-psycopg2. Stops the default postgres@16-main service
because pg_auto_failover manages its own instance.
tasks/monitor.yml — `pg_autoctl create monitor`, gated on the
absence of `<pgdata>/postgresql.conf` so re-runs no-op.
Renders systemd unit `pg_autoctl.service` and starts it.
tasks/node.yml — `pg_autoctl create postgres` joining the
monitor URI from defaults. Sets formation sync-standbys
policy idempotently from any node.
templates/pg_autoctl-{monitor,node}.service.j2 — minimal
systemd units, Restart=on-failure, NOFILE=65536.
README.md — operations cheatsheet (state, URI, manual failover),
vault setup, ops scope (PgBouncer + pgBackRest + multi-region
explicitly out — landing W2 day 7-8 + v1.2+).
infra/ansible/inventory/lab.yml
Added `postgres_ha` group (with sub-groups `postgres_ha_monitor`
+ `postgres_ha_nodes`) wired to the `community.general.incus`
connection plugin so Ansible reaches each container via
`incus exec` on the lab host — no in-container SSH setup.
infra/ansible/tests/test_pg_failover.sh
The acceptance script. Sequence:
0. read formation state via monitor — abort if degraded baseline
1. `incus stop --force pgaf-primary` — start RTO timer
2. poll monitor every 1s for the standby's promotion
3. `incus start pgaf-primary` so the lab returns to a 2-node
healthy state for the next run
4. fail unless promotion happened within RTO_TARGET_SECONDS=60
Exit codes 0/1/2/3 (pass / unhealthy baseline / timeout / missing
tool) so a CI cron can plug in directly later.
Acceptance verified locally:
$ ansible-playbook -i inventory/lab.yml playbooks/postgres_ha.yml \
--syntax-check
playbook: playbooks/postgres_ha.yml ← clean
$ ansible-playbook -i inventory/lab.yml playbooks/postgres_ha.yml \
--list-tasks
4 plays, 22 tasks across plays, all tagged.
$ bash -n infra/ansible/tests/test_pg_failover.sh
syntax OK
Real `--check` + apply requires SSH access to the R720 + the
community.general collection installed (`ansible-galaxy collection
install community.general`). Operator runs that step.
Out of scope here (per ROADMAP §2 deferred):
- Multi-host data nodes (W2 day 7+ when Hetzner standby lands)
- HA monitor — single-monitor is fine for v1.0 scale
- PgBouncer (W2 day 7), pgBackRest (W2 day 8), OTel collector (W2 day 9)
SKIP_TESTS=1 — IaC YAML + bash, no app code.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
40 lines
1.3 KiB
YAML
40 lines
1.3 KiB
YAML
# pg_auto_failover monitor — the formation's state machine.
|
|
# Runs its own postgres instance under
|
|
# `pg_auto_failover_state_dir/monitor`. Single-instance for v1.0.9.
|
|
---
|
|
- name: Check whether the monitor is already initialised
|
|
ansible.builtin.stat:
|
|
path: "{{ pg_auto_failover_state_dir }}/monitor/postgresql.conf"
|
|
register: monitor_initialised
|
|
|
|
- name: Initialise pg_auto_failover monitor
|
|
become: true
|
|
become_user: postgres
|
|
ansible.builtin.command:
|
|
cmd: >
|
|
/usr/lib/postgresql/{{ postgres_version }}/bin/pg_autoctl create monitor
|
|
--pgdata {{ pg_auto_failover_state_dir }}/monitor
|
|
--pgport {{ pg_auto_failover_monitor_port }}
|
|
--hostname {{ pg_auto_failover_monitor_host }}
|
|
--auth trust
|
|
--ssl-self-signed
|
|
--run-as-keeper
|
|
args:
|
|
creates: "{{ pg_auto_failover_state_dir }}/monitor/postgresql.conf"
|
|
when: not monitor_initialised.stat.exists
|
|
|
|
- name: Render systemd unit for pg_autoctl monitor
|
|
ansible.builtin.template:
|
|
src: pg_autoctl-monitor.service.j2
|
|
dest: /etc/systemd/system/pg_autoctl.service
|
|
owner: root
|
|
group: root
|
|
mode: "0644"
|
|
notify: Restart pg_autoctl
|
|
|
|
- name: Enable + start pg_autoctl monitor service
|
|
ansible.builtin.systemd:
|
|
name: pg_autoctl
|
|
state: started
|
|
enabled: true
|
|
daemon_reload: true
|