What is Nginx default port?

Nginx uses port 80 for HTTP and 443 for HTTPS.

What is MySQL default port?

MySQL uses port 3306 for client connections.

Redis uses port 6379 by default.

In-memory caching systems for performance optimization

3 services

redis-server systemctl: redis-server

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In-memory data structure store. Used as database, cache, message broker. Supports strings, hashes, lists, sets, sorted sets.

apt install redis-server redis-tools

6379tcpRedis protocol16379tcpCluster bus (if clustering)26379tcpSentinel

memcached systemctl: memcached

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High-performance distributed memory caching system. Simple key-value store, no persistence.

apt install memcached libmemcached-tools

11211tcpMemcached protocol11211udpMemcached UDP (disabled by default)

varnish systemctl: varnish

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HTTP accelerator and reverse proxy cache. Extremely fast, uses VCL for configuration.

apt install varnish

6081tcpHTTP (client-facing)6082tcpManagement interface