CakePHP 2.x系からRedisを利用するためのDockerfileとcore.php

core.php

<?php

Cache::config('default', array(
	'engine'      => 'Redis',
	'prefix'      => null,
	'duration'    => 3600,
	'probability' => 100,
	'server'      => env('REDIS_HOST'),
	'port'        => env('REDIS_PORT'),
	'persistent'  => true,
	'compress'    => false,
));


$engine = 'Redis';

// In development mode, caches should expire quickly.
$duration = '+999 days';
if (Configure::read('debug') > 0) {
	$duration = '+10 seconds';
}

// Prefix each application on the same server with a different string, to avoid Memcache and APC conflicts.
$prefix = 'app_';

/**
 * Configure the cache used for general framework caching. Path information,
 * object listings, and translation cache files are stored with this configuration.
 */
Cache::config('_cake_core_', array(
	'engine'      => $engine,
	'prefix'      => $prefix . 'cake_core_',
	'path'        => CACHE . 'persistent' . DS,
	'server'      => env('REDIS_HOST'),
	'port'        => env('REDIS_PORT'),
	'serialize'   => ($engine === 'File'),
	'duration'    => $duration
));

/**
 * Configure the cache for model and datasource caches. This cache configuration
 * is used to store schema descriptions, and table listings in connections.
 */
Cache::config('_cake_model_', array(
	'engine'      => $engine,
	'prefix'      => $prefix . 'cake_model_',
	'path'        => CACHE . 'models' . DS,
	'server'      => env('REDIS_HOST'),
	'port'        => env('REDIS_PORT'),
	'serialize'   => ($engine === 'File'),
	'duration'    => $duration
));

Dockerfile

FROM php:7.2.1-fpm-alpine3.7


# Redisとの連携部分の定義
ENV REDIS_HOST redis
ENV REDIS_PORT 6379

# redis拡張をインストール
ENV PHPREDIS_VERSION 3.1.2

RUN docker-php-source extract \
    && curl -L -o /tmp/redis.tar.gz https://github.com/phpredis/phpredis/archive/$PHPREDIS_VERSION.tar.gz \
    && tar xfz /tmp/redis.tar.gz \
    && rm -r /tmp/redis.tar.gz \
    && mv phpredis-$PHPREDIS_VERSION /usr/src/php/ext/redis \
    && docker-php-ext-install redis \
    && docker-php-source delete