最有感的效能提升Redis

安裝後記檢查 PhpRedis 沒有有啟用，如果沒有的話再補上 php-redis

購物站點了可以秒反應，非常有感 XD

啟用後記得檢查設定檔
/wp-admin/options-general.php?page=redis-cache#diagnostics

Status: Connected
Client: PhpRedis (v6.1.0)
Drop-in: Valid
Disabled: No
Ping: 1
Errors: []
PhpRedis: 6.1.0
Relay: Not loaded
Predis: 2.1.2
Credis: Not loaded
PHP Version: 7.4.33
Plugin Version: 2.5.4
Redis Version: 7.4.2
Multisite: No
Metrics: Enabled
Metrics recorded: 427
Filesystem: Writable
Global Prefix: "wp_"
Blog Prefix: "wp_"
Timeout: 1
Read Timeout: 1
Retry Interval: 
WP_REDIS_PLUGIN_PATH: "/var/www/wp/test1/wp-content/plugins/redis-cache"
Global Groups: [
    "blog-details",
    "blog-id-cache",
    "blog-lookup",
    "global-posts",
    "networks",
    "rss",
    "sites",
    "site-details",
    "site-lookup",
    "site-options",
    "site-transient",
    "users",
    "useremail",
    "userlogins",
    "usermeta",
    "user_meta",
    "userslugs",
    "redis-cache",
    "blog_meta"
]
Ignored Groups: [
    "counts",
    "plugins",
    "themes"
]
Unflushable Groups: []
Groups Types: {
    "blog-details": "global",
    "blog-id-cache": "global",
    "blog-lookup": "global",
    "global-posts": "global",
    "networks": "global",
    "rss": "global",
    "sites": "global",
    "site-details": "global",
    "site-lookup": "global",
    "site-options": "global",
    "site-transient": "global",
    "users": "global",
    "useremail": "global",
    "userlogins": "global",
    "usermeta": "global",
    "user_meta": "global",
    "userslugs": "global",
    "redis-cache": "global",
    "blog_meta": "global",
    "counts": "ignored",
    "plugins": "ignored",
    "themes": "ignored"
}
Drop-ins: [
    "advanced-cache.php v by ",
    "Redis Object Cache Drop-In v2.5.4 by Till Krüss"
]

如果你的有多個站，建議用Docker把快取資料庫分開，才不會混亂

Docker的範例

version: '3'
services:
  redis-site1:
    image: redis:latest
    command: redis-server --port 6379 --maxmemory 256mb --maxmemory-policy allkeys-lru --appendonly yes
    ports:
      - "6381:6379"
    volumes:
      - redis-data-site1:/data

  redis-site2:
    image: redis:latest
    command: redis-server --port 6379 --maxmemory 256mb --maxmemory-policy allkeys-lru --appendonly yes
    ports:
      - "6382:6379"
    volumes:
      - redis-data-site2:/data

  redis-site3:
    image: redis:latest
    command: redis-server --port 6379 --maxmemory 256mb --maxmemory-policy allkeys-lru --appendonly yes
    ports:
      - "6383:6379"
    volumes:
      - redis-data-site3:/data

  redis-site4:
    image: redis:latest
    command: redis-server --port 6379 --maxmemory 256mb --maxmemory-policy allkeys-lru --appendonly yes
    ports:
      - "6384:6379"
    volumes:
      - redis-data-site4:/data

  redis-site5:
    image: redis:latest
    command: redis-server --port 6379 --maxmemory 256mb --maxmemory-policy allkeys-lru --appendonly yes
    ports:
      - "6385:6379"
    volumes:
      - redis-data-site5:/data

  redis-site6:
    image: redis:latest
    command: redis-server --port 6379 --maxmemory 256mb --maxmemory-policy allkeys-lru --appendonly yes
    ports:
      - "6386:6379"
    volumes:
      - redis-data-site6:/data

  redis-site7:
    image: redis:latest
    command: redis-server --port 6379 --maxmemory 256mb --maxmemory-policy allkeys-lru --appendonly yes
    ports:
      - "6387:6379"
    volumes:
      - redis-data-site7:/data

  redis-site8:
    image: redis:latest
    command: redis-server --port 6379 --maxmemory 256mb --maxmemory-policy allkeys-lru --appendonly yes
    ports:
      - "6388:6379"
    volumes:
      - redis-data-site8:/data

  redis-site9:
    image: redis:latest
    command: redis-server --port 6379 --maxmemory 256mb --maxmemory-policy allkeys-lru --appendonly yes
    ports:
      - "6389:6379"
    volumes:
      - redis-data-site9:/data

  redis-site10:
    image: redis:latest
    command: redis-server --port 6379 --maxmemory 256mb --maxmemory-policy allkeys-lru --appendonly yes
    ports:
      - "6390:6379"
    volumes:
      - redis-data-site10:/data

volumes:
  redis-data-site1:
  redis-data-site2:
  redis-data-site3:
  redis-data-site4:
  redis-data-site5:
  redis-data-site6:
  redis-data-site7:
  redis-data-site8:
  redis-data-site9:
  redis-data-site10:

設定時對應好 port 就行了

define('WP_REDIS_HOST', 'localhost'); // 或你的 Redis 伺服器 IP
define('WP_REDIS_PORT', 6381);
define('WP_REDIS_TIMEOUT', 1);
define('WP_REDIS_READ_TIMEOUT', 1);
define('WP_REDIS_SCHEME', 'tcp');
define('WP_REDIS_CLIENT', 'phpredis');