Redis是一种缓存技术，允许WEB应用程序快速存储数据并从内存中回收。Redis是分布式缓存(很像MEMCACHED)，但提供了更多的底层功能。安装Redis让你的网站大幅度提升性能。
废话不多说，直接安装Redis如下，安装环境Centos 8
1. 安装
yum install redis
2. 编辑配置文件，如果同一台服务器，可保持默认
vim /etc/redis.conf
#requirepass那行并打开注释，在后面写自己的密码，如下 requirepass yourpassword 将bind 后 127.0.0.1 改为 内网IP # 为安全起见，请勿使用 0.0.0.0 protected-mode yes 改为 protected-mode no # 关闭保护模式 daemonize no 改为 daemonize yes # 开启守护进程 3. 启动
systemctl start redis
//重启
systemctl stop redis
4. 开启自启动
systemctl enable redis
5. 开放防火墙端口（如有需要）
firewall-cmd --zone=public --add-port=80/tcp --permanent
firewall-cmd --zone=public --add-port=6379/tcp --permanent
//重启防火墙
systemctl restart firewalld
**这里也提供下Ubuntu的安装Redis方式**
1. 安装
sudo apt-get install redis-server
2. 查看redis状态
ps -aux|grep redis
输出结果如下：
redis 7207 0.0 0.1 40112 1712 ? Ssl 09:56 0:00 /usr/bin/redis-server 127.0.0.1:6379
root 7221 0.0 0.0 14376 988 pts/0 S+ 09:57 0:00 grep –color=auto redis
3. 根据启动命令检查服务状态
netstat -nlt|grep 6379
4. 检查Redis的状态
sudo /etc/init.d/redis-server status
5. 修改配置（如需）
sudo vi /etc/redis/redis.conf
******配置redis******
cd /www/wwwroot/magento-root/app/etc/ cp env.php noredis.env.php #默认的配置文件备份 cd /www/wwwroot/magento #退到文件根目录
*配置redis，在网站根目录下执行以下命令
**配置默认缓存
bin/magento setup:config:set --cache-backend=redis --cache-backend-redis-server=127.0.0.1 --cache-backend-redis-db=0
**配置页面缓存
bin/magento setup:config:set --page-cache=redis --page-cache-redis-server=127.0.0.1 --page-cache-redis-db=1
查看是否配置成功
redis-cli monitor
如果配置成功，浏览器访问任意页面SSH会输出类似下面的结果
1476826133.810090 [0 127.0.0.1:52366] "select" "1" 1476826133.816293 [0 127.0.0.1:52367] "select" "0" 1476826133.817461 [0 127.0.0.1:52367] "hget" "zc:k:ea6_GLOBAL__DICONFIG" "d" 1476826133.829666 [0 127.0.0.1:52367] "hget" "zc:k:ea6_DICONFIG049005964B465901F774DB9751971818" "d" 1476826133.837854 [0 127.0.0.1:52367] "hget" "zc:k:ea6_INTERCEPTION" "d" 1476826133.868374 [0 127.0.0.1:52368] "select" "1" 1476826133.869011 [0 127.0.0.1:52369] "select" "0" 1476826133.869601 [0 127.0.0.1:52369] "hget" "zc:k:ea6_DEFAULT_CONFIG_CACHE_DEFAULT__10__235__32__1080MAGENTO2" "d" 1476826133.872317 [0 127.0.0.1:52369] "hget" "zc:k:ea6_INITIAL_CONFIG" "d" 1476826133.879267 [0 127.0.0.1:52369] "hget" "zc:k:ea6_GLOBAL_PRIMARY_PLUGIN_LIST" "d" 1476826133.883312 [0 127.0.0.1:52369] "hget" "zc:k:ea6_GLOBAL__EVENT_CONFIG_CACHE" "d" 1476826133.898431 [0 127.0.0.1:52369] "hget" "zc:k:ea6_DB_PDO_MYSQL_DDL_STAGING_UPDATE_1" "d" 1476826133.898794 [0 127.0.0.1:52369] "hget" "zc:k:ea6_RESOLVED_STORES_D1BEFA03C79CA0B84ECC488DEA96BC68" "d" 1476826133.905738 [0 127.0.0.1:52369] "hget" "zc:k:ea6_DEFAULT_CONFIG_CACHE_STORE_DEFAULT_10__235__32__1080MAGENTO2" "d" ... more ... 1476826210.634998 [0 127.0.0.1:52439] "hmset" "zc:k:ea6_MVIEW_CONFIG" "d" "a:18:{s:19:\"design_config_dummy\";a:4:{s:7:\"view_id\";s:19:\"design_config_dummy\";s:12:\"action_class\";s:39:\"Magento\\Theme\\Model\\Indexer\\Mview\\Dummy\";s:5:\"group\";s:7:\"indexer\";s:13:\"subscriptions\";a:0:{}}s:14:\"customer_dummy\";a:4:{s:7:\"view_id\";s:14:\"customer_dummy\";s:12:\"action_class\";s:42:\"Magento\\Customer\\Model\\Indexer\\Mview\\Dummy\";s:5:\"group\";s:7:\"indexer\";s:13:\"subscriptions\";a:0:{}}s:13:\"cms_page_grid\";a:4:{s:7:\"view_id\";s:13:\"cms_page_grid\";s:12:\"action_class\";s:43:\"Magento\\Catalog\\Model\\Indexer\\Category\\Flat\";s:5:\"group\";s:7:\"indexer\";s:13:\"subscriptions\";a:1:{s:8:\"cms_page\";a:3:{s:4:\"name\";s:8:\"cms_page\";s:6:\"column\";s:7:\"page_id\";s:18:\"subscription_model\";N;}}}s:21:\"catalog_category_flat\";a:4:{s:7:\"view_id\";s:21:\"catalog_category_flat\";s:12:\"action_class\";s:43:\"Magento\\Catalog\\Model\\Indexer\\Category\\Flat\";s:5:\"group\";s:7:\"indexer\";s:13:\"subscriptions\";a:6:{s:23:\"catalog_category_entity\";a:3:{s:4:\"name\";s:23:\"catalog_category_entity\";s:6:\"column\";s:9:\"entity_id\";s:18:\"subscription_model\";N;}s:31:\"catalog_category_entity_decimal\";a:3:{s:4:\"name\";s:31:\"catalog_category_entity_decimal\";s:6:\"column\";s:9:\"entity_id\";s:18:\"subscription_model\";s:71:\"Magento\\CatalogStaging\\Model\\Mview\\View\\Category\\Attribute\\Subscription\";}s:27:\"catalog_category_entity_int\";a:3:{s:4:\"name\";s:27:\"catalog_category_entity_int\";s:6:\"column\";s:9:\"entity_id\";s:18:\"subscription_model\";s:71:\"Magento\\CatalogStaging\\Model\\Mview\\View\\Category\\Attribute\\Subscription\";}s:28:\"catalog_category_entity_text\";a:3:{s:4:\"name\";s:28:\"catalog_category_entity_text\";s:6:\"column\";s:9:\"entity_id\";s:18:\"subscription_model\";s:71:\"Magento\\CatalogStaging\\Model\\Mview\\View\\Category\\Attribute\\Subscription\";}s:31:\"catalog_category_entity_varchar\";a:3:{s:4:\"name\";s:31:\"catalog_category_entity_varchar\";s:6:\"column\";s:9:\"entity_id\";s:18:\"subscription_model\";s:71:\"Magento\\CatalogStaging\\Model\\Mview\\View\\Category\\Attribute\\Subscription\";}s:32:\"catalog_category_entity_datetime\";a:3:{s:4:\"name\";s:32:\"catalog_category_entity_datetime\";s:6:\"column\";s:9:\"entity_id\";s:18:\"subscription_model\";s:71:\"Magento\\CatalogStaging\\Model\\Mview\\View\\Category\\Attribute\\Subscription\";}}}s:24:\"catalog_category_product\";a:4:{s:7:\"view_id\";s:24:\"catalog_category_product\";s:12:\"action_class\";s:46:\"Magento\\Catalog\\Model\\Indexer\\Category\\Product\";s:5:\"group\";s:7:\"indexer\";s:13:\"subscriptions\";a:2:{s:23:\"catalog_category_entity\";a:3:{s:4:\"name\";s:23:\"catalog_category_entity\";s:6:\"column\" ... more ...------------------------------------
清除缓存：
redis-cli flushall bin/magento cache:flush bin/magento cache:clean
网站如需迁移，可执行下面的操作方便迁移
cp env.php redis.env.php #网站迁移前将配置过redis的配置文件备份
cp noredis.env.php env.php #把之前默认的配置文件恢复，然后清除缓存
本文参考连接：https://devdocs.magento.com/guides/v2.4/config-guide/redis/redis-pg-cache.html
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