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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>
54 lines
1.6 KiB
YAML
54 lines
1.6 KiB
YAML
# Install Postgres + pg_auto_failover from the upstream PGDG repo.
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# PGDG ships pg-auto-failover-NN packages alongside postgresql-NN, so
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# version-pinning the postgres_version pins both.
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---
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- name: Add PGDG apt signing key
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ansible.builtin.get_url:
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url: "{{ postgres_apt_key_url }}"
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dest: /etc/apt/keyrings/postgresql.asc
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mode: "0644"
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force: false
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- name: Add PGDG apt source
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ansible.builtin.copy:
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dest: /etc/apt/sources.list.d/pgdg.sources
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owner: root
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group: root
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mode: "0644"
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content: |
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Enabled: yes
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Types: deb
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URIs: https://apt.postgresql.org/pub/repos/apt
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Suites: {{ ansible_distribution_release }}-pgdg
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Components: main
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Signed-By: /etc/apt/keyrings/postgresql.asc
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- name: Update apt cache (PGDG repo just added)
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ansible.builtin.apt:
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update_cache: true
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changed_when: false
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- name: Install Postgres + pg_auto_failover packages
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ansible.builtin.apt:
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name:
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- "postgresql-{{ postgres_version }}"
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- "postgresql-client-{{ postgres_version }}"
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- "pg-auto-failover-cli"
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- "postgresql-{{ postgres_version }}-auto-failover"
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- python3-psycopg2 # for Ansible postgresql_db / postgresql_user modules
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state: present
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- name: Stop the default postgres cluster (pg_auto_failover manages its own)
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ansible.builtin.service:
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name: "postgresql@{{ postgres_version }}-main"
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state: stopped
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enabled: false
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failed_when: false
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- name: Ensure pg_auto_failover state dir exists, owned by postgres
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ansible.builtin.file:
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path: "{{ pg_auto_failover_state_dir }}"
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state: directory
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owner: postgres
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group: postgres
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mode: "0700"
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