Setup Redis Object Cache untuk WordPress di Ubuntu

# Cek versi Ubuntu
lsb_release -a

# Cek versi PHP
php --version

# Cek versi WordPress (via WP-CLI)
wp core version

# Update package index
sudo apt update && sudo apt upgrade -y

# Install dependencies
sudo apt install curl wget gnupg lsb-release -y

# Install Redis server dan tools
sudo apt install redis-server redis-tools -y

# Install PHP Redis extension
# Untuk PHP 8.3 (Ubuntu 24.04 default)
sudo apt install php8.3-redis php8.3-igbinary -y

# Untuk PHP 8.1
sudo apt install php8.1-redis php8.1-igbinary -y

# Untuk PHP 7.4
sudo apt install php7.4-redis php7.4-igbinary -y

# Cek versi Redis
redis-server --version

# Cek status service
sudo systemctl status redis-server

# Test koneksi
redis-cli ping

# Redis version
Redis server v=7.4.0 sha=00000000:0 malloc=jemalloc-5.3.0 bits=64 build=4c5dd93d32ec1d2e

# Status active
● redis-server.service - Advanced key-value store
   Active: active (running)

# Ping response
PONG

# Download Redis 8 RC
cd /tmp
wget https://github.com/redis/redis/archive/refs/heads/unstable.tar.gz
tar -xzf unstable.tar.gz
cd redis-unstable

# Compile dan install
make
sudo make install

# Buat konfigurasi
sudo mkdir -p /etc/redis
sudo cp redis.conf /etc/redis/redis.conf

sudo nano /etc/redis/redis.conf

# Memory Management (2025 Best Practices)
maxmemory 512mb
maxmemory-policy allkeys-lru

# Network Configuration
bind 127.0.0.1 ::1
port 6379

# Security
requirepass your_strong_redis_password_2025

# Persistence (Optional untuk caching)
save 900 1
save 300 10
save 60 10000

# Logging
loglevel notice
logfile /var/log/redis/redis-server.log

# Performance Tuning 2025
tcp-keepalive 300
timeout 0

# Restart Redis service
sudo systemctl restart redis-server

# Enable auto-start pada boot
sudo systemctl enable redis-server

# Verifikasi konfigurasi
sudo systemctl status redis-server

# Via WP-CLI
wp plugin install redis-cache --activate

# Atau download manual dari WordPress.org

sudo nano /path/to/wordpress/wp-config.php

// Redis Configuration 2025
define('WP_REDIS_HOST', '127.0.0.1');
define('WP_REDIS_PORT', 6379);
define('WP_REDIS_PASSWORD', 'your_strong_redis_password_2025');
define('WP_REDIS_DATABASE', 0);

// Cache key salt (ganti dengan domain Anda)
define('WP_CACHE_KEY_SALT', 'yoursite.com');

// Advanced settings
define('WP_REDIS_TIMEOUT', 1);
define('WP_REDIS_READ_TIMEOUT', 1);
define('WP_REDIS_MAXTTL', 86400); // 24 hours

// Enable igbinary serialization (better performance)
define('WP_REDIS_SERIALIZER', 'igbinary');

// Selective caching (optional)
define('WP_REDIS_SELECTIVE_FLUSH', true);

# Via WP-CLI
wp redis enable

# Verifikasi status
wp redis status

# Download drop-in file yang compatible dengan WordPress 6.7+
cd /path/to/wordpress/wp-content/
wget https://raw.githubusercontent.com/rhubarbgroup/redis-cache/develop/includes/object-cache.php

# Set permissions
sudo chown www-data:www-data object-cache.php
sudo chmod 644 object-cache.php

// Advanced Redis Configuration 2025
global $redis_server;
$redis_server = [
    'host'     => '127.0.0.1',
    'port'     => 6379,
    'auth'     => 'your_strong_redis_password_2025',
    'database' => 0,
    'timeout'  => 1,
    'read_timeout' => 1,
];

// Performance optimizations
define('WP_REDIS_MAXTTL', 86400);
define('WP_REDIS_CLIENT', 'phpredis'); // atau 'predis'
define('WP_REDIS_SERIALIZER', 'igbinary');

// Cluster support (for high-traffic sites)
// define('WP_REDIS_CLUSTER', [
//     'tcp://127.0.0.1:7001',
//     'tcp://127.0.0.1:7002',
//     'tcp://127.0.0.1:7003',
// ]);

# Bind ke localhost saja
sudo nano /etc/redis/redis.conf
# Pastikan: bind 127.0.0.1 ::1

# Set strong password
requirepass $(openssl rand -base64 32)

# Disable dangerous commands
rename-command FLUSHDB ""
rename-command FLUSHALL ""
rename-command KEYS ""
rename-command DEBUG ""

# UFW firewall (Ubuntu default)
sudo ufw deny 6379
sudo ufw reload

# Atau dengan iptables
sudo iptables -A INPUT -p tcp --dport 6379 -s 127.0.0.1 -j ACCEPT
sudo iptables -A INPUT -p tcp --dport 6379 -j DROP

# Masuk ke Redis CLI
redis-cli -a your_password

# Buat user khusus untuk WordPress
127.0.0.1:6379> ACL SETUSER wordpress on >wp_password +@all -flushall -flushdb

# Simpan ACL
127.0.0.1:6379> ACL SAVE

# Real-time monitoring
redis-cli --latency-history -i 1

# Memory usage
redis-cli info memory

# Hit rate statistics
redis-cli info stats | grep keyspace

# Via WP-CLI
wp redis metrics

# Check cache ratio
wp redis info

# Flush cache ketika diperlukan
wp redis flush

# Optimize Redis memory
redis-cli MEMORY PURGE

# Analyze memory usage
redis-cli --bigkeys

# Check slow queries
redis-cli SLOWLOG GET 10

# Cek status Redis
sudo systemctl status redis-server

# Cek port listening
sudo netstat -tlnp | grep 6379

# Cek logs
sudo tail -f /var/log/redis/redis-server.log

# Fix file permissions
sudo chown -R www-data:www-data /path/to/wordpress/wp-content/
sudo chmod 755 /path/to/wordpress/wp-content/object-cache.php

# SELinux (jika enabled)
sudo setsebool -P httpd_can_network_connect 1

# Check Redis memory usage
redis-cli info memory

# Increase max memory
sudo nano /etc/redis/redis.conf
# Edit: maxmemory 1gb

# Restart Redis
sudo systemctl restart redis-server

# Update plugin via WP-CLI
wp plugin update redis-cache

# Atau manual download dari WordPress.org

// wp-config.php untuk WordPress multisite
define('WP_REDIS_DATABASE', get_current_network_id());
define('WP_CACHE_KEY_SALT', $_SERVER['HTTP_HOST']);

// Cluster configuration untuk high traffic
define('WP_REDIS_CLUSTER', [
    'tcp://redis-1:6379',
    'tcp://redis-2:6379',
    'tcp://redis-3:6379',
]);

// Connection pooling
define('WP_REDIS_TIMEOUT', 0.5);
define('WP_REDIS_READ_TIMEOUT', 0.5);

// Development environment
if (WP_DEBUG) {
    define('WP_REDIS_DISABLE_COMMENT', false);
    define('WP_REDIS_PREFIX', 'dev_');
}

// Production environment
if (!WP_DEBUG) {
    define('WP_REDIS_DISABLE_COMMENT', true);
    define('WP_REDIS_PREFIX', 'prod_');
}

# /etc/nginx/sites-available/wordpress
location ~* \.(css|js|jpg|jpeg|png|gif|ico|svg)$ {
    expires 1y;
    add_header Cache-Control "public, immutable";
}

# Redis FastCGI cache (optional)
fastcgi_cache_path /var/cache/nginx levels=1:2 keys_zone=WORDPRESS:100m inactive=60m;

# .htaccess optimizations
<IfModule mod_expires.c>
    ExpiresActive On
    ExpiresByType text/css "access plus 1 year"
    ExpiresByType application/javascript "access plus 1 year"
</IfModule>

# Useful WP-CLI commands
wp redis status                 # Check Redis status
wp redis enable                 # Enable object cache
wp redis disable                # Disable object cache
wp redis update-dropin           # Update drop-in file
wp redis metrics                 # Performance metrics
wp redis info                    # Detailed information

# Apache Bench
ab -n 1000 -c 10 http://yoursite.com/

# WordPress CLI
wp profile stage --spotlight

# GTmetrix/PageSpeed insights untuk live testing

#!/bin/bash
# /usr/local/bin/redis-maintenance.sh

# Backup Redis data
redis-cli --rdb /backup/redis-$(date +%Y%m%d).rdb

# Clean old backups (keep 7 days)
find /backup -name "redis-*.rdb" -mtime +7 -delete

# Check memory usage
redis-cli info memory | grep used_memory_human

# Restart if memory usage > 80%
memory_usage=$(redis-cli info memory | grep used_memory_rss | cut -d: -f2)
if [ $memory_usage -gt 838860800 ]; then  # 800MB
    systemctl restart redis-server
    echo "Redis restarted due to high memory usage"
fi

# Buat cron job
sudo crontab -e
# Tambahkan: 0 2 * * * /usr/local/bin/redis-maintenance.sh

# Update Redis
sudo apt update && sudo apt upgrade redis-server

# Update WordPress dan plugin
wp core update
wp plugin update redis-cache

# Test setelah update
wp redis status