Table of Contents
Why Redis is Essential for Modern Web Applications
Every time a user visits your website, your application makes database queries. Without caching, a page with 20 database queries runs all 20 queries on every single page load. Redis stores query results in memory — subsequent identical requests return the cached result in microseconds instead of executing the full database query.
Installing Redis
apt install redis-server -y
systemctl enable redis-server
# Configure password
redis-cli CONFIG SET requirepass "StrongPassword123"
# Verify
redis-cli -a StrongPassword123 ping
# PONGRedis as a Laravel Cache Backend
# .env
CACHE_DRIVER=redis
SESSION_DRIVER=redis
QUEUE_CONNECTION=redis
REDIS_HOST=127.0.0.1
REDIS_PASSWORD=StrongPassword123
REDIS_PORT=6379Cache Invalidation Strategies
Cache invalidation is famously difficult. The three main approaches are: Time-based expiration (TTL) — simple but can serve stale data. Event-driven invalidation — delete cache keys when underlying data changes. Cache-aside pattern — check cache first, if miss query DB and populate cache.
FAQ
How much RAM does Redis need?
Redis is extremely memory-efficient. A typical web application cache fits in 256 MB to 1 GB. Plan for 1.5x your estimated cache size to account for memory fragmentation.
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