Phase 3 — replication chain (old → v2):
- Discovered the v2 cluster was running redis:7.4-alpine, but the
Bitnami old master ships redis 8.6.2 which writes RDB format 13 —
the 7.4 replicas rejected the stream with "Can't handle RDB format
version 13". Bumped v2 image to redis:8-alpine (also 8.6.2) to
restore PSYNC compatibility.
- Discovered that sentinel on BOTH v2 and old Bitnami clusters
auto-discovered the cross-cluster replication chain when v2-0
REPLICAOF'd the old master, triggering a failover that reparented
old-master to a v2 replica and took HAProxy's backend offline.
Mitigation: `SENTINEL REMOVE mymaster` on all 5 sentinels (both
clusters) during the REPLICAOF surgery, then re-MONITOR after
cutover. This must be done on the OLD sentinels too, not just v2 —
they're the ones that kept fighting our REPLICAOF.
- Set up the chain: v2-0 REPLICAOF old-master; v2-{1,2} REPLICAOF v2-0.
All 76 keys (db0:76, db1:22, db4:16) synced including `immich_bull:*`
BullMQ queues and `_kombu.*` Celery queues — the user-stated
must-survive data class.
Phase 4 — HAProxy cutover:
- Updated `kubernetes_config_map.haproxy` to point at
`redis-v2-{0,1,2}.redis-v2-headless` for both redis_master and
redis_sentinel backends (removed redis-node-{0,1}).
- Promoted v2-0 (`REPLICAOF NO ONE`) at the same time as the
ConfigMap apply so HAProxy's 1s health-check interval found a
role:master within a few seconds. Cutover disruption on HAProxy
rollout was brief; old clients naturally moved to new HAProxy pods
within the rolling update window.
- Re-enabled sentinel monitoring on v2 with `SENTINEL MONITOR
mymaster <hostname> 6379 2` after verifying `resolve-hostnames yes`
+ `announce-hostnames yes` were active — this ensures sentinel
stores the hostname (not resolved IP) in its rewritten config, so
pod-IP churn on restart doesn't break failover.
Phase 5 — chaos:
- Round 1: killed master v2-0 mid-probe. First run exposed the
sentinel IP-storage issue (stored 10.10.107.222, went stale on
restart) — ~12s probe disruption. Fixed hostname persistence and
re-MONITORed.
- Round 2: killed new master v2-2 with hostnames correctly stored.
Sentinel elected v2-0, HAProxy re-routed, 1/40 probe failures over
60s — target <3s of actual user-visible disruption.
Phase 6 — Nextcloud simplification:
- `zzz-redis.config.php` no longer queries sentinel in-process —
just points at `redis-master.redis.svc.cluster.local`. Removed 20
lines of PHP. HAProxy handles master tracking transparently now
that it's scaled to 3 + PDB minAvailable=2.
Phase 7 step 1:
- `kubectl scale statefulset/redis-node --replicas=0` (transient —
TF removal in a 24h follow-up). Old PVCs `redis-data-redis-node-{0,1}`
preserved as cold rollback.
Docs:
- Rewrote `databases.md` Redis section to reflect post-cutover reality
and the sentinel hostname gotcha (so future sessions don't relearn it).
- `.claude/reference/service-catalog.md` entry updated.
The parallel-bootstrap race documented in the previous commit is still
worth watching — the init container now defaults to pod-0 as master
when no peer reports role:master-with-slaves, so fresh boots land in
a deterministic topology.
Closes: code-7n4
Closes: code-9y6
Closes: code-cnf
Closes: code-tc4
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
154 lines
3.7 KiB
YAML
154 lines
3.7 KiB
YAML
nextcloud:
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host: nextcloud.viktorbarzin.me
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trustedDomains:
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- nextcloud.viktorbarzin.me
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# mail:
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# enabled: true
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# # the user we send email as
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# fromAddress: nextcloud@viktorbarzin.me
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# # the domain we send email from
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# domain: viktorbarzin.me
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# smtp:
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# host: mail.viktorbarzin.me
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# secure: starttls
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# port: 587
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# authtype: LOGIN
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# name: nextcloud@viktorbarzin.me
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# password:
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extraEnv:
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- name: TRUSTED_PROXIES
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value: "10.0.0.0/8"
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- name: PHP_MEMORY_LIMIT
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value: "512M"
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- name: PHP_UPLOAD_LIMIT
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value: "16G"
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# - name: mail_smtpdebug
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# value: "true"
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# - name: loglevel
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# value: "0"
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configs:
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zzz-redis.config.php: |
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<?php
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// Redis via HAProxy master-only service. HAProxy (3 replicas, PDB
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// minAvailable=2) health-checks all v2 pods via `INFO replication` and
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// routes to the current role:master. Sentinel failover takes <30s, and
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// HAProxy detects the new master via its 1s tcp-check interval and
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// starts routing within ~3s of detection. Removed the old in-process
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// sentinel-query loop on 2026-04-19 after the Redis rework — see
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// beads code-v2b and infra/docs/architecture/databases.md.
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$CONFIG = array(
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'memcache.distributed' => '\\OC\\Memcache\\Redis',
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'memcache.locking' => '\\OC\\Memcache\\Redis',
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'redis' => array(
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'host' => 'redis-master.redis.svc.cluster.local',
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'port' => 6379,
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'password' => '',
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'timeout' => 1.5,
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'read_timeout' => 1.5,
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),
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);
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performance.config.php: |
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<?php
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$CONFIG = array(
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'loglevel' => 2,
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'mail_smtpdebug' => false,
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);
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zzz-mysql.config.php: |
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<?php
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$CONFIG = array(
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'mysql.utf8mb4' => true,
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);
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phpConfigs:
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zzz-custom.ini: |
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max_execution_time = 300
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max_input_time = 300
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default_socket_timeout = 300
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opcache.enable_file_override = 1
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apc.shm_size = 128M
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extraVolumes:
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- name: apache-tuning
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configMap:
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name: nextcloud-apache-tuning
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- name: db-password-sync
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configMap:
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name: nextcloud-db-password-sync
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defaultMode: 0755
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extraVolumeMounts:
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- name: apache-tuning
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mountPath: /etc/apache2/mods-available/mpm_prefork.conf
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subPath: mpm_prefork.conf
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- name: db-password-sync
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mountPath: /docker-entrypoint-hooks.d/before-starting
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internalDatabase:
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enabled: false
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externalRedis:
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enabled: false
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externalDatabase:
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enabled: true
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type: mysql
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host: ${mysql_host}
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user: nextcloud
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database: nextcloud
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existingSecret:
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secretName: nextcloud-db-creds
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usernameKey: db-username
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passwordKey: DB_PASSWORD
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persistence:
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enabled: true
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existingClaim: nextcloud-data-encrypted
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accessMode: ReadWriteOnce
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size: 20Gi
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startupProbe:
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enabled: true
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initialDelaySeconds: 30
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periodSeconds: 10
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timeoutSeconds: 30
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failureThreshold: 60
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successThreshold: 1
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livenessProbe:
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enabled: true
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initialDelaySeconds: 30
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periodSeconds: 60
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timeoutSeconds: 30
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failureThreshold: 10
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successThreshold: 1
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readinessProbe:
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enabled: true
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initialDelaySeconds: 30
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periodSeconds: 60
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timeoutSeconds: 30
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failureThreshold: 5
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successThreshold: 1
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podAnnotations:
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diun.enable: "true"
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diun.include_tags: "^[0-9]+(?:.[0-9]+)?(?:.[0-9]+)?.*"
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dependency.kyverno.io/wait-for: "mysql.dbaas:3306,redis-master.redis:6379"
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secret.reloader.stakater.com/reload: "nextcloud-db-creds"
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collabora:
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enabled: false # Using onlyoffice instead
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resources:
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limits:
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memory: 8Gi
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requests:
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cpu: 50m
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memory: 256Mi
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cronjob:
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enabled: true
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resources:
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limits:
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memory: 384Mi
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requests:
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cpu: 25m
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memory: 384Mi
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