WordPress搭配Redis加速网站访问速度

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Wordpress搭配Redis加速网站访问速度

本文最后更新于 2020年08月13日

Wordpress搭配Redis加速网站访问速度

最近把整个网站的架构都做了调优,现在访问起来是不是比之前快多了,不过还有一个地方没有做优化,今天就着手搭配Redis,加快网站速度

2020.08.06更新

Redis介绍

  • Redis是一个开源的高性能的key-value存储系统。具有以下特点:
  • 1、Redis支持数据的持久化,可以将内存中的数据保持在磁盘中,重启的时候可以再次加载进行使用。
  • 2、Redis不仅仅支持简单的key-value类型的数据,同时还提供list,set,sorted set,hash等数据结构的存储。
  • 3、Redis支持数据的备份,即master-slave模式的数据备份。
  • Redis优势:
  • 1、性能极高 – Redis能读的速度是110000次/s,写的速度是81000次/s 。
  • 2、丰富的数据类型 – Redis支持二进制案例的 String, List, Hash, Set 及 Sorted Set 数据类型操作。
  • 3、原子 – Redis的所有操作都是原子性的,同时Redis还支持对几个操作全并后的原子性执行。
  • 4、丰富的特性 – Redis还支持 publish/subscribe, 通知, key 过期等等特性

Redis的部署

我的博客的所有服务都是通过docker部署,所以增加一个redis服务器简直不要太方便

Code example

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# docker-compose.yml里增加如下内容,注意缩进 

redis:

    image: redis:alpine

    restart: always

    volumes:

      - redis-data:/data

volumes:

  redis-data:

docker-compose up -d 更新即可

WordPress配置文件修改

编辑wp-config.php,找到define( 'DB_COLLATE', '');define( 'DB_COLLATE', ''); 后添加如下内容

Code example

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/** Redis Object Cache */

define( 'WP_REDIS_CLIENT', 'credis' );

define('WP_REDIS_HOST', 'redis');

define('WP_REDIS_DATABASE', '0');

Wordpress搭配Redis加速网站访问速度

注意一定要在define( 'DB_COLLATE', ''); 后,我一开始也不知道放在哪,导致死活链接不上Redis,网上搜索资料,发现千篇一律,全是一个样,最后在WordPress官方支持论坛里找到了解决方案

https://wordpress.org/support/topic/status-not-connected-2/

define("WP_REDIS_HOST', 'redis'); host填写你的redis地址,因为我是docker compose部署,在yml就定义好,如果你不是的话,把redis填写为你的Redis服务器地址,端口我没有暴露出来,所以没改

安装Redis Object Cache插件

官方市场里搜索下载即可

Wordpress搭配Redis加速网站访问速度

Redis Object Cache的配置

如果你照我前面的都配置好了,那么Redis Object Cache打开即用

Wordpress搭配Redis加速网站访问速度

Redis Object Cache 参数

插件目录下有readme,按照你的需求添加填写到wp-config.php

Wordpress搭配Redis加速网站访问速度
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== Connection Parameters ==

By default the object cache drop-in will connect to Redis over TCP at `127.0.0.1:6379` and select database `0`.

To adjust the connection parameters, define any of the following constants in your `wp-config.php` file.

  * `WP_REDIS_CLIENT` (default: _not set_)

      Specifies the client used to communicate with Redis. Supports `hhvm`, `pecl` and `predis`.

  * `WP_REDIS_SCHEME` (default: `tcp`)

      Specifies the protocol used to communicate with an instance of Redis. Internally the client uses the connection class associated to the specified connection scheme. Supports `tcp` (TCP/IP), `unix` (UNIX domain sockets), `tls` (transport layer security) or `http` (HTTP protocol through Webdis).

  * `WP_REDIS_HOST` (default: `127.0.0.1`)

      IP or hostname of the target server. This is ignored when connecting to Redis using UNIX domain sockets.

  * `WP_REDIS_PORT` (default: `6379`)

      TCP/IP port of the target server. This is ignored when connecting to Redis using UNIX domain sockets.

  * `WP_REDIS_PATH` (default: _not set_)

      Path of the UNIX domain socket file used when connecting to Redis using UNIX domain sockets.

  * `WP_REDIS_DATABASE` (default: `0`)

      Accepts a numeric value that is used to automatically select a logical database with the `SELECT` command.

  * `WP_REDIS_PASSWORD` (default: _not set_)

      Accepts a value used to authenticate with a Redis server protected by password with the `AUTH` command.

  * `WP_REDIS_TIMEOUT` (default: `5`)

      Amount of time in seconds (fractions of a second allowed) to attempt initial connection to Redis server before failing.

  * `WP_REDIS_READ_TIMEOUT` (default: `5`)

      Amount of time in seconds (fractions of a second allowed) to attempt a read from the Redis server before failing.

  * `WP_REDIS_RETRY_INTERVAL` (default: _not set_)

      Amount of time in milliseconds to retry a failed connection attempt.

== Configuration Parameters ==

To adjust the configuration, define any of the following constants in your `wp-config.php` file.

  * `WP_CACHE_KEY_SALT` (default: _not set_)

    Set the prefix for all cache keys. Useful in setups where multiple installs share a common `wp-config.php` or `$table_prefix` to guarantee uniqueness of cache keys.

  * `WP_REDIS_SELECTIVE_FLUSH` (default: _not set_)

    If set to `true`, flushing the cache will only delete keys that are prefixed with `WP_CACHE_KEY_SALT` (instead of emptying the entire Redis database). The selective flush is an atomic `O(n)` operation.

  * `WP_REDIS_MAXTTL` (default: _not set_)

    Set maximum time-to-live (in seconds) for cache keys with an expiration time of `0`.

  * `WP_REDIS_GLOBAL_GROUPS` (default: `['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']`)

    Set the list of network-wide cache groups that should not be prefixed with the blog-id _(Multisite only)_.

  * `WP_REDIS_IGNORED_GROUPS` (default: `['counts', 'plugins']`)

    Set the cache groups that should not be cached in Redis.

  * `WP_REDIS_UNFLUSHABLE_GROUPS` (default: _not set_)

    Set groups not being flushed during a selective cache flush.

  * `WP_REDIS_DISABLED` (default: _not set_)

    Set to `true` to disable the object cache at runtime.

  * `WP_REDIS_GRACEFUL` (default: _not set_)

    Set to `false` to disable graceful failures and throw exceptions.

  * `WP_REDIS_SERIALIZER` (default: _not set_)

    Use PhpRedis’ built-in serializers. Supported values are `Redis::SERIALIZER_PHP` and `Redis::SERIALIZER_IGBINARY`.

  * `WP_REDIS_IGBINARY` (default: _not set_)

  * `WP_REDIS_DISABLE_BANNERS` (default: _not set_)

== Replication & Clustering ==

For replication use the `WP_REDIS_SERVERS` constant, for sharding the `WP_REDIS_SHARDS` constant and for clustering the `WP_REDIS_CLUSTER` constant.

For authentication use the `WP_REDIS_PASSWORD` constant.

__Replication (Master-Slave):__

    define( 'WP_REDIS_SERVERS', [

        'tcp://127.0.0.1:6379?database=5&alias=master',

        'tcp://127.0.0.2:6379?database=5&alias=slave-01',

    ] );

__Replication (Redis Sentinel):__

    define( 'WP_REDIS_CLIENT', 'predis' );

    define( 'WP_REDIS_SENTINEL', 'mymaster' );

    define( 'WP_REDIS_SERVERS', [

        'tcp://127.0.0.1:5380',

        'tcp://127.0.0.2:5381',

        'tcp://127.0.0.3:5382',

    ] );

__Sharding:__

    define( 'WP_REDIS_SHARDS', [

        'tcp://127.0.0.1:6379?database=10&alias=shard-01',

        'tcp://127.0.0.2:6379?database=10&alias=shard-02',

        'tcp://127.0.0.3:6379?database=10&alias=shard-03',

    ] );

__Clustering (Redis 3.0+):__

    define( 'WP_REDIS_CLUSTER', [

        'tcp://127.0.0.1:6379?database=15&alias=node-01',

        'tcp://127.0.0.2:6379?database=15&alias=node-02',

    ] );

== WP-CLI Commands ==

To use the WP-CLI commands, make sure the plugin is activated:

    wp plugin activate redis-cache

The following commands are supported:

  * `wp redis status`

    Show the Redis object cache status and (when possible) client.

  * `wp redis enable`

    Enables the Redis object cache. Default behavior is to create the object cache drop-in, unless an unknown object cache drop-in is present.

  * `wp redis disable`

    Disables the Redis object cache. Default behavior is to delete the object cache drop-in, unless an unknown object cache drop-in is present.

  * `wp redis update-dropin`

    Updates the Redis object cache drop-in. Default behavior is to overwrite any existing object cache drop-in.

== Screenshots ==

1. Plugin settings, connected to a single Redis server.

2. Plugin settings, not connected to a Redis cluster.

== Changelog ==

= 1.5.7 =

- Added support for PhpRedis TLS connections

- Added support for timeout, read timeout and password when using PhpRedis cluster

- Fixed issue with `INFO` command

- Fixed object cloning when setting cache keys

= 1.5.6 =

- Added object cloning to in-memory cache

- Fixed PHP notice related to `read_timeout` parameter

= 1.5.5 =

Please flush the object cache after updating the drop to v1.5.5 to avoid dead keys filling up Redis memory.

  * Removed lowercasing keys

  * Remove scheduled metrics event

  * Fixed Redis version call when using replication

= 1.5.4 =

  * Removed metrics

= 1.5.3 =

  * Fixed: Call to undefined function `get_plugin_data()`

  * Fixed: Call to undefined method `WP_Object_Cache::redis_version()`

= 1.5.2 =

  * Added Redis version to diagnostics

  * Added `WP_REDIS_DISABLE_BANNERS` constant to disable promotions

  * Fixed an issue with `redis.replicate_commands()`

= 1.5.1 =

This plugin turned 5 years today (Nov 14th) and its only fitting to release the business edition today as well.

  * Added execution times to actions

  * Added `WP_REDIS_VERSION` constant

  * Fixed PhpRedis v3 compatibility

  * Fixed an issue with selective flushing

  * Fixed an issue with `mb_*` functions not existing

  * Replaced Email Address Encoder card with Redis Cache Pro card

  * Gather version metrics for better decision making

= 1.5.0 =

Since Predis isn't maintained any longer, it's highly recommended to switch over to PhpRedis (the Redis PECL extention).

  * Improved Redis key name builder

  * Added support for PhpRedis serializers

  * Added `redis_object_cache_error` action

  * Added timeout, read-timeout and retry configuration

  * Added unflushable groups (defaults to `['userlogins']`)

  * Fixed passwords not showing in server list

= 1.4.3 =

  * Require PHP 5.4 or newer

  * Use pretty print in diagnostics

  * Throw exception if Redis library is missing

  * Fixed cache not flushing for some users

  * Fixed admin issues when `WP_REDIS_DISABLED` is `false`

= 1.4.2 =

  * Added graceful Redis failures and `WP_REDIS_GRACEFUL` constant

  * Improved cluster support

  * Added `redis_cache_expiration` filter

  * Renamed `redis_object_cache_get` filter to `redis_object_cache_get_value`

= 1.4.1 =

  * Fixed potential fatal error related to `wp_suspend_cache_addition()`

= 1.4.0 =

  * Added support for igbinary

  * Added support for `wp_suspend_cache_addition()`

= 1.3.9 =

  * Fixed `WP_REDIS_SHARDS` not showing up in server list

  * Fixed `WP_REDIS_SHARDS` not working when using PECL extension

  * Removed `WP_REDIS_SCHEME` and `WP_REDIS_PATH` leftovers

= 1.3.8 =

  * Switched from single file Predis version to full library

= 1.3.7 =

  * Revert back to single file Predis version

= 1.3.6 =

  * Added support for Redis Sentinel

  * Added support for sharing

  * Switched to PHAR version of Predis

  * Improved diagnostics

  * Added `WP_REDIS_SELECTIVE_FLUSH`

  * Added `$fail_gracefully` parameter to `WP_Object_Cache::__construct()`

  * Always enforce `WP_REDIS_MAXTTL`

  * Pass `$selective` and `$salt` to `redis_object_cache_flush` action

  * Don’t set `WP_CACHE_KEY_SALT` constant

= 1.3.5 =

  * Added basic diagnostics to admin interface

  * Added `WP_REDIS_DISABLED` constant to disable cache at runtime

  * Prevent "Invalid plugin header" error

  * Return integer from `increment()` and `decrement()` methods

  * Prevent object cache from being instantiated more than once

  * Always separate cache key `prefix` and `group` by semicolon

  * Improved performance of `build_key()`

  * Only apply `redis_object_cache_get` filter if callbacks have been registered

  * Fixed `add_or_replace()` to only set cache key if it doesn't exist

  * Added `redis_object_cache_flush` action

  * Added `redis_object_cache_enable` action

  * Added `redis_object_cache_disable` action

  * Added `redis_object_cache_update_dropin` action

= 1.3.4 =

  * Added WP-CLI support

  * Show host and port unless scheme is unix

  * Updated default global and ignored groups

  * Do a cache flush when activating, deactivating and uninstalling

= 1.3.3 =

  * Updated Predis to `v1.1.1`

  * Added `redis_instance()` method

  * Added `incr()` method alias for Batcache compatibility

  * Added `WP_REDIS_GLOBAL_GROUPS` and `WP_REDIS_IGNORED_GROUPS` constant

  * Added `redis_object_cache_delete` action

  * Use `WP_PLUGIN_DIR` with `WP_CONTENT_DIR` as fallback

  * Set password when using a cluster or replication

  * Show Redis client in `stats()`

  * Change visibility of `$cache` to public

  * Use old array syntax, just in case

= 1.3.2 =

  * Make sure `$result` is not `false` in `WP_Object_Cache::get()`

= 1.3.1 =

  * Fixed connection issue

= 1.3 =

  * New admin interface

  * Added support for `wp_cache_get()`'s `$force` and `$found` parameter

  * Added support for clustering and replication with Predis

= 1.2.3 =

  * UI improvements

= 1.2.2 =

  * Added `redis_object_cache_set` action

  * Added `redis_object_cache_get` action and filter

  * Prevented duplicated admin status messages

  * Load bundled Predis library only if necessary

  * Load bundled Predis library using `WP_CONTENT_DIR` constant

  * Updated `stats()` method output to be uniform with WordPress

= 1.2.1 =

  * Added `composer.json`

  * Added deactivation and uninstall hooks to delete `object-cache.php`

  * Added local serialization functions for better `advanced-cache.php` support

  * Updated bundled Predis version to `1.0.3`

  * Updated heading structure to be semantic

= 1.2 =

  * Added Multisite support

  * Moved admin menu under _Settings_ menu

  * Fixed PHP notice in `get_redis_client_name()`

= 1.1.1 =

  * Call `select()` and optionally `auth()` if HHVM extension is used

= 1.1 =

  * Added support for HHVM's Redis extension

  * Added support for PECL Redis extension

  * Added `WP_REDIS_CLIENT` constant, to set preferred Redis client

  * Added `WP_REDIS_MAXTTL` constant, to force expiration of cache keys

  * Improved `add_or_replace()`, `get()`, `set()` and `delete()` methods

  * Improved admin screen styles

  * Removed all internationalization/localization from drop-in

= 1.0.2 =

  * Added "Flush Cache" button

  * Added support for UNIX domain sockets

  * Improved cache object retrieval performance significantly

  * Updated bundled Predis library to version `1.0.1`

= 1.0.1 =

  * Load plugin translations

  * Hide global admin notices from non-admin users

  * Prevent direct file access to `redis-cache.php` and `admin-page.php`

  * Colorize "Disable Object Cache" button

  * Call `Predis\Client->connect()` to avoid potential uncaught `Predis\Connection\ConnectionException`

= 1.0 =

  * Initial release

== Upgrade Notice ==

= 1.4.2 =

This update renames the `redis_object_cache_get` filter to avoid conflicts. Update your code if necessary.

= 1.4.0 =

This update adds support for igbinary and `wp_suspend_cache_addition()`.

= 1.3.9 =

This update contains fixes for sharding.

= 1.3.8 =

This update contains a critical fix for Predis.

= 1.3.7 =

This update fixes an issue with Predis in some environments.

= 1.3.6 =

This update contains various improvements.

= 1.3.5 =

This update contains various changes, including performance improvements and better Batcache compatibility.

= 1.3.4 =

This update contains several improvements, including WP CLI and WordPress 4.6 support.

= 1.3.3 =

This update contains several improvements.

= 1.3.2 =

This update includes a critical fix for PhpRedis.

= 1.3.1 =

This update includes a critical connection issue fix.

= 1.3 =

This update includes a new admin interface and support for clustering and replication with Predis.

= 1.2.3 =

This updated includes several UI improvements.

= 1.2.2 =

This updated includes several bug fixes and improvements.

= 1.2.1 =

This update includes several improvements and compatibility fixes.

= 1.1.1 =

This update fixes critical bugs with the HHVM extension

= 1.1 =

This update includes bug fixes and adds supports for HHVM/PECL Redis extensions.

= 1.0.2 =

This update includes significant speed improvements and support for UNIX domain sockets.

= 1.0.1 =

This update includes several security, user interface and general code improvements.

原创声明
本文由 NG6 于2020年03月29日发表在 sleele的博客
如未特殊声明,本站所有文章均为原创;你可以在保留作者及原文地址的情况下转载
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