chore: bump local dev redis image to redis:8#439
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tuj
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May 7, 2026
Redis 8 GA'd 2025-05 (back to OSI-approved AGPLv3 licensing) and ships
RedisJSON / RediSearch / RedisTimeSeries / RedisBloom in-tree.
No Symfony / phpredis changes needed:
- symfony/cache 6.4 RedisTrait only checks `redis_version >= 2.8` (SCAN)
and `>= 4.0` (UNLINK); Redis 8 satisfies both.
- itkdev/php8.4-fpm ships phpredis 6.3, which fully supports Redis 8.
- DSN format and `--maxmemory{,-policy}` flags are unchanged.
Verified locally: stack boots on `redis:8.6.3`, all six redis-backed
cache pools clear cleanly via `cache:pool:clear`, full PHPUnit suite
(143 tests, 607 assertions) passes.
Production deployments are unaffected — operators bring their own Redis;
this only touches `docker-compose.override.yml`.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
Bumps the local dev
redisservice fromredis:6toredis:8. Only touchesdocker-compose.override.yml— production deployments bring their own Redis and aren't affected by this PR.Symfony 6.4 LTS ↔ Redis 8 compatibility (research summary)
Fully compatible, no code or config changes needed:
symfony/cache 6.4.36RedisTraitversion checksredis_version >= 2.8(SCAN) and>= 4.0(UNLINK). Redis 8 trivially satisfies both. No "≤7 only" code paths.itkdev/php8.4-fpmshipsphpredis 6.3.0— full Redis 8 support (RESP3, Sentinel, SSL). No predis/relay used.GETRANGEreturning empty bulk on out-of-range negative end index — Symfony cache doesn't useGETRANGE.--maxmemory 128mb --maxmemory-policy allkeys-lrustill valid in Redis 8.redis://host:port/dbunchanged.Files Changed
docker-compose.override.yml—image: "redis:6"→image: "redis:8", with a comment explaining why this is safe under Symfony 6.4.CHANGELOG.md—[Unreleased]entry.Local verification (already run)
redis:8.6.3(current Redis 8 minor on Docker Hub).feeds.cache,feed.without.expire.cache,calendar.api.cache,auth.screen.cache,screen.status.cache,interactive_slide.cache) clear cleanly viabin/console cache:pool:clear.Test Plan
docker compose down -v && docker compose up -d.docker compose exec redis redis-cli INFO server | grep redis_version→ expectredis_version:8.x.x.docker compose run --rm phpfpm bin/console cache:pool:clear feeds.cache→ expect[OK] Cache was successfully cleared.docker compose run --rm phpfpm composer run test→ expect 143/143 green.🤖 Generated with Claude Code