Redis trong production: các best practices quan trọng nhất cần tuân thủ?

Vận hành Redis production tốt đòi hỏi cấu hình security đúng (auth, TLS, ACL), chọn persistence phù hợp, tránh blocking operation, và monitor các metric quan trọng như evicted_keys và slowlog.

Best practices khi vận hành Redis trong production:

• Security: bật authentication (requirepass), dùng ACL (ACL SETUSER ... nocommands +@write) thay vì rename-command cho Redis 6.0+ để kiểm soát permission chi tiết hơn, bind Redis chỉ trên internal interface (không expose ra internet), dùng TLS cho Redis 6+.
• Availability: dùng Sentinel hoặc Cluster, đặt replica-priority hợp lý, test failover định kỳ.
• Performance: đặt maxmemory phù hợp với RAM (để lại 20-30% cho OS và fragmentation), chọn maxmemory-policy đúng, monitor slowlog (slowlog-log-slower-than 10000 microseconds).
• Tránh blocking operation: không dùng KEYS * trên production (dùng SCAN), không dùng SMEMBERS trên Set lớn (dùng SSCAN), cẩn thận với SORT, LRANGE trên List dài.
• Connection management: dùng connection pool (max pool size = 10-50), set tcp-keepalive 300.
• Backup: cấu hình RDB snapshot, monitor rdb_last_save_time và rdb_changes_since_last_save.
• Upgrade: Redis minor version backward compatible, major version cần test kỹ; dùng Redis managed service (ElastiCache, Redis Cloud) để giảm operational burden.

Running Redis in production well requires correct security configuration (auth, TLS, ACL), appropriate persistence settings, avoiding blocking operations, and monitoring key metrics like evicted_keys and slowlog.

Most important best practices for Redis in production:

• Security: enable authentication (requirepass), use ACL (ACL SETUSER ... nocommands +@write) instead of rename-command for Redis 6.0+ to control permissions more granularly, bind Redis only to internal interfaces (never expose to the internet), and use TLS for Redis 6+.
• Availability: use Sentinel or Cluster, set replica-priority appropriately, and test failover regularly.
• Performance: set maxmemory to leave 20-30% of RAM free for the OS and fragmentation, choose the correct maxmemory-policy, and monitor the slow log (slowlog-log-slower-than 10000 microseconds).
• Avoid blocking operations: never use KEYS * in production (use SCAN), never use SMEMBERS on large Sets (use SSCAN), and be cautious with SORT and LRANGE on long Lists.
• Connection management: use a connection pool (max pool size 10-50) and set tcp-keepalive 300.
• Backups: configure RDB snapshots and monitor rdb_last_save_time and rdb_changes_since_last_save.
• Upgrades: Redis minor versions are backward compatible; major versions require thorough testing. Consider using a managed Redis service (ElastiCache, Redis Cloud) to reduce operational overhead.