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<p>这篇博文主用来记录读到的Redis相关的文章</p>
<h2 id="实践案例"><a href="#实践案例" class="headerlink" title="实践案例"></a>实践案例</h2><ul>
<li><a href="https://mp.weixin.qq.com/s?__biz=MzAwMDU1MTE1OQ==&mid=2653547585&idx=1&sn=9a664b16f656f757632cd4eb29f9a5dc&scene=1&srcid=0726LGdy9zmneqsZyAekKukJ#rd" target="_blank" rel="noopener">近千节点的Redis Cluster高可用集群案例:优酷蓝鲸优化实战</a>：详细的介绍了Redis Cluster下心跳信息对带宽的影响。</li>
<li><a href="https://mp.weixin.qq.com/s/LeSSdT6bOEFzZyN26PRVzg" target="_blank" rel="noopener">干货 | 携程Redis海外机房数据同步实践</a>：携程开源 Redis 多数据中心复制管理系统 X-Pipe</li>
<li><a href="https://mp.weixin.qq.com/s?__biz=MzU1NDA4NjU2MA==&mid=2247486458&idx=1&sn=5d69ab965d84c69516caecbb776f0799&source=41#wechat_redirect" target="_blank" rel="noopener">优酷蓝鲸近千节点的Redis集群运维经验总结</a>：Redis Cluster运维时遇到的一些问题(<font color="red">实用</font>)</li>
<li><a href="https://mp.weixin.qq.com/s?__biz=MzAwMDU1MTE1OQ==&mid=2653547622&idx=1&sn=199cd6d8e3dff7c839935a7613d43e76&scene=1" target="_blank" rel="noopener">同程旅游缓存系统设计:如何打造Redis时代的完美体系</a>：携程Redis架构发展历程(<font color="red">推荐阅读</font>)</li>
<li><a href="https://mp.weixin.qq.com/s?__biz=MzAwMDU1MTE1OQ==&mid=2653547053&idx=1&sn=833fddbc83379d9cac8d7f757343412e" target="_blank" rel="noopener">Redis实战：如何构建类微博的亿级社交平台</a></li>
<li><a href="https://mp.weixin.qq.com/s?__biz=MzI4MTY5NTk4Ng==&mid=2247489693&idx=1&sn=b3138663029f41744203acf174725feb&source=41#wechat_redirect" target="_blank" rel="noopener">日请求量过亿，谈陌陌的Feed服务优化之路</a></li>
<li><a href="https://www.infoq.cn/article/2016/06/redis-storage-practise/" target="_blank" rel="noopener">Redis 应用实践：小红书海量 Redis 存储之道</a></li>
<li><a href="https://mp.weixin.qq.com/s?__biz=MzAwNTg2MDUyMw==&mid=2247483661&idx=1&sn=c924b3a2b098c4211b0044de180a1c0e" target="_blank" rel="noopener">如何实现高可用的redis集群</a>：客户端分片模式的Redis集群方案</li>
<li><a href="https://mp.weixin.qq.com/s?__biz=MzA4Nzg5Nzc5OA==&mid=2651660079&idx=1&sn=bca50ad39792deadf167077308120264" target="_blank" rel="noopener">唯品会大规模 Redis Cluster 的生产实践</a></li>
<li><a href="https://mp.weixin.qq.com/s?__biz=MzA3MzYwNjQ3NA==&mid=2651296671&idx=1&sn=366de50a6787963517ff6e096c9d1643" target="_blank" rel="noopener">这可能是最全的 Redis 集群方案介绍了</a></li>
<li><a href="https://mp.weixin.qq.com/s?__biz=MzAxMTEyOTQ5OQ==&mid=402004912&idx=1&sn=7517696a86f54262e60e1b5636d6cbe0" target="_blank" rel="noopener">Redis 集群的合纵与连横</a></li>
<li><a href="https://mp.weixin.qq.com/s?__biz=MzA5NzA0ODA1Nw==&mid=2650513422&idx=1&sn=846550678e98d0ea1adb444579ba558f" target="_blank" rel="noopener">Redis时延问题分析及应对</a></li>
<li><a href="https://developer.aliyun.com/article/46636#index_section" target="_blank" rel="noopener">干货来袭！Redis技术盛宴——阿里云Redis交流会火热召开</a></li>
<li><a href="https://mp.weixin.qq.com/s?__biz=MzAwMDU1MTE1OQ==&mid=2653547160&idx=1&sn=befd195e2aa788775aaf1cc3b6f6fab3" target="_blank" rel="noopener">首发丨360开源的类Redis存储系统:Pika</a></li>
<li><a href="https://redislabs.com/blog/the-endless-redis-replication-loop-what-why-and-how-to-solve-it/" target="_blank" rel="noopener">The Endless Redis Replication Loop: What, Why and How to Solve It</a></li>
<li><a href="https://redislabs.com/blog/top-redis-headaches-for-devops-replication-buffer/#.VxzASUC3PqB" target="_blank" rel="noopener">Top Redis Headaches for Devops – Replication Buffer</a></li>
<li><a href="https://mp.weixin.qq.com/s/g_OE7i66R9LqFgXmL9XvVg" target="_blank" rel="noopener">一次教科书级别的Redis高可用架构设计实践</a></li>
<li><a href="https://www.iteye.com/blog/carlosfu-2254566" target="_blank" rel="noopener">美团在Redis上踩过的一些坑-1.客户端周期性出现connect timeout</a></li>
<li><a href="https://mp.weixin.qq.com/s/l9A-z-Ol8FaSXg8Q0NU1UQ" target="_blank" rel="noopener">美团点评万亿级 KV 存储架构演进</a></li>
<li><a href="https://mp.weixin.qq.com/s/otae8hHeY-3Xb048ZSLJfQ" target="_blank" rel="noopener">牛逼！完美解密Redis与秒杀系统！！！</a></li>
</ul>
<ul>
<li><a href="https://mp.weixin.qq.com/s?__biz=MzAwODg3MDk0OQ==&mid=2247483698&idx=1&sn=9f82dcf764c86948a2ad5339d295cae4" target="_blank" rel="noopener">浅谈redis超时(二)</a>：翻译官方的redis延迟排查步骤。学习到了新命令(latency)</li>
<li><a href="https://www.iteye.com/blog/zsxxsz-2293332" target="_blank" rel="noopener">使用 redis_builder 管理 redis 集群</a>：C++编写的redis cluster集群工具</li>
<li><a href="http://soft.dog/2016/04/28/redis-docker-config/" target="_blank" rel="noopener">Redis 容器与配置</a></li>
<li><a href="https://mp.weixin.qq.com/s?__biz=MzI0NTE4NjA0OQ==&mid=2658351573&idx=2&sn=fb194491852b84b793233b2bebc456dc" target="_blank" rel="noopener">Docker化高可用redis集群</a>：docker搭建Redis主从+sentinel教程</li>
<li><a href="https://juejin.im/entry/579868e80a2b580061e352d2" target="_blank" rel="noopener">使用 Docker Compose 部署基于 Sentinel 的高可用 Redis 集群</a></li>
<li><a href="https://www.cnblogs.com/zhoujinyi/p/5585723.html" target="_blank" rel="noopener">Redis Sentinel 高可用实现说明</a> （要是早半个月看到这篇文章多好。自需求+正好遇到了文中提到的坑。PS：加一个坑：主从实例不能重命名config命令）</li>
<li><a href="https://mp.weixin.qq.com/s?__biz=MzU1NDA4NjU2MA==&mid=2247486425&idx=1&sn=c3aa5e3983b2320eecdda995b4fc81b6" target="_blank" rel="noopener">怎样打造一个分布式数据库 | 数据库功能深度解析</a></li>
<li><a href="https://blog.huangz.me/2020/redisraft.html" target="_blank" rel="noopener">使用 RedisRaft 构建强一致的 Redis 集群</a></li>
</ul>
<h2 id="机制、源码"><a href="#机制、源码" class="headerlink" title="机制、源码"></a>机制、源码</h2><ul>
<li><a href="https://mp.weixin.qq.com/s?__biz=MzAwNjQwNzU2NQ==&mid=2650342814&idx=1&sn=aba5c247a8c726cea3a86bac64d4a339" target="_blank" rel="noopener">Redis压缩列表原理与应用分析</a></li>
<li><a href="http://antirez.com/news/109" target="_blank" rel="noopener">Random notes on improving the Redis LRU algorithm</a></li>
<li><a href="https://mp.weixin.qq.com/s?__biz=MzI1MjExMDMzNQ==&mid=2651113608&idx=1&sn=0d1ec5f7e1201c2fdea72ab2df091cec" target="_blank" rel="noopener">Redis学习系列之八：Redis事务玩法</a>：Redis事务介绍和源码分析</li>
<li><a href="https://mp.weixin.qq.com/s?__biz=MzIwNzEzNDkxNQ==&mid=2650967934&idx=1&sn=1abd598b740ec3b42f76d59a14e4b788" target="_blank" rel="noopener">源码分析redis的sentinel在master宕机时是如何选择新的master的</a></li>
<li><a href="https://mp.weixin.qq.com/s?__biz=MzAwNTI4NzIxMQ==&mid=400500895&idx=1&sn=b27d22914d6b3cedc2fe16ccd02a1a01" target="_blank" rel="noopener">Redis主从同步失败案例的步步深入</a>：redis主从同步的一个bug(已修复)</li>
<li><a href="https://mp.weixin.qq.com/s?__biz=MzA3MzYwNjQ3NA==&mid=2651296996&idx=2&sn=5f4811d73e74e2a63b1cb0d3d532862a" target="_blank" rel="noopener">深入浅出 Redis Cluster 原理，来自一次干货分享</a>：Redis Cluster原理讲解</li>
<li><a href="https://www.jianshu.com/p/48b0d96740a5" target="_blank" rel="noopener">Redis和IO多路复用</a></li>
<li><a href="https://yq.aliyun.com/live/1153?spm=a2c4e.11154022.liveshowinfo.11.4022ebc42plKm5" target="_blank" rel="noopener">Redis主从复制演变过程</a> （很好的讲解了Redis各版本中复制的演变）</li>
<li><a href="https://mp.weixin.qq.com/s?__biz=MzA5ODM5MDU3MA==&mid=2650861715&idx=1&sn=e30a388f897c8953842fb5e8843048e4" target="_blank" rel="noopener">Redis 缓存失效机制</a></li>
<li><a href="http://zhangtielei.com/posts/blog-redis-quicklist.html" target="_blank" rel="noopener">Redis内部数据结构详解(5)——quicklist</a></li>
<li><a href="https://blog.csdn.net/Xiejingfa/article/details/51553370" target="_blank" rel="noopener">Redis源码剖析 - Redis持久化之RDB</a></li>
<li><a href="https://developer.aliyun.com/article/58703" target="_blank" rel="noopener">Redis源码学习——BIO</a></li>
<li><a href="https://developer.aliyun.com/article/62593" target="_blank" rel="noopener">Redis短连接性能优化</a></li>
<li><a href="https://hk.v2ex.com/t/646669" target="_blank" rel="noopener">Redis 多线程 IO 模型</a></li>
<li><a href="https://mp.weixin.qq.com/s?__biz=MzA4NTg1MjM0Mg==&mid=2657261425&idx=1&sn=d840079ea35875a8c8e02d9b3e44cf95&scene=0&key=c50f8b988e61749ab65cb6b9c037598ca0bafdf899895598f2904791c26b5e4283079646ce247da25d76658cd815b833&ascene=0&uin=MzM4Njg2NDU1" target="_blank" rel="noopener">Redis为什么用跳表而不用平衡树？</a></li>
<li><a href="https://developer.aliyun.com/article/62593" target="_blank" rel="noopener">Redis短连接性能优化</a></li>
<li><a href="https://mp.weixin.qq.com/s?__biz=MzIzNjUxMzk2NQ==&mid=2247483989&idx=1&sn=c1aac5b3eca9cb3f9e177d88ba189719" target="_blank" rel="noopener">深入浅出 Redis client/server交互流程</a></li>
</ul>
<h2 id="版本特性"><a href="#版本特性" class="headerlink" title="版本特性"></a>版本特性</h2><ul>
<li><a href="https://mp.weixin.qq.com/s/Gm1EzhbcZEWpw8eXmP_ibw" target="_blank" rel="noopener">Redis 6.0 新特性概览</a></li>
<li><a href="https://mp.weixin.qq.com/s/OGE2KivQzooNsWKJyvlgzQ" target="_blank" rel="noopener">客户端缓存功能</a> </li>
<li><a href="https://mp.weixin.qq.com/s/Mc9SpVeuRIe8Pi2HkPQWjQ" target="_blank" rel="noopener">带你100% 地了解 Redis 6.0 的客户端缓存</a></li>
<li><a href="https://www.infoq.cn/article/fe97cBWx6Hqk9qVvoW7r" target="_blank" rel="noopener">Redis 干货分享 | Redis 访问控制列表 (ACL)</a></li>
</ul>
<h2 id="Redis相关工具"><a href="#Redis相关工具" class="headerlink" title="Redis相关工具"></a>Redis相关工具</h2><ul>
<li><a href="https://developer.aliyun.com/article/691794" target="_blank" rel="noopener">数据迁移工具-redisSheke</a></li>
<li><a href="https://developer.aliyun.com/article/690463" target="_blank" rel="noopener">数据对比工具-redisFullCheck</a></li>
<li><a href="https://mp.weixin.qq.com/s?__biz=MjM5NzM0MjcyMQ==&mid=2650068463&idx=2&sn=d9aa4cc763a6b0554b031a4451fe09aa" target="_blank" rel="noopener">nredis-proxy 高性能Redis 服务中间件</a></li>
</ul>
<blockquote>
<p><a href="https://toutiao.io/tags/Redis" target="_blank" rel="noopener">https://toutiao.io/tags/Redis</a><br><a href="https://github.com/huangz1990/redis-3.0-annotated" target="_blank" rel="noopener">https://github.com/huangz1990/redis-3.0-annotated</a></p>
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<a class="post-title-link" href="/2222/07/06/new/MySQL/MySQL文章记录/" itemprop="url">MySQL文章学习记录</a></h1>
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<p>这篇博文主用来记录读到的MySQL相关的文章</p>
<h2 id="机制系列"><a href="#机制系列" class="headerlink" title="机制系列"></a>机制系列</h2><ul>
<li><a href="https://jin-yang.github.io/post/mysql-protocol.html" target="_blank" rel="noopener">MySQL 通讯协议</a>：客户端与服务端连接过程中，密码怎样传输</li>
<li><a href="https://mp.weixin.qq.com/s/2jqPhy_6zefgrx0zqhgNCw" target="_blank" rel="noopener">活久见，为什么SHOW TABLE STATUS总是不更新</a></li>
<li><a href="https://blog.csdn.net/n88Lpo/article/details/81187372" target="_blank" rel="noopener">图解MySQL MySQL组提交(group commit)</a></li>
</ul>
<h2 id="故障及优化案例系列"><a href="#故障及优化案例系列" class="headerlink" title="故障及优化案例系列"></a>故障及优化案例系列</h2><ul>
<li><a href="https://mp.weixin.qq.com/s/VS534q8wv_rJxZ0EawhU9Q" target="_blank" rel="noopener">大规模多存储场景的数据库选型与服务平台建设</a></li>
<li><a href="https://mp.weixin.qq.com/s/hYsxeevggxwkObJyOqy3iA" target="_blank" rel="noopener">引号错位引起的故障</a> （我才不会告诉你踩过的一个坑：update xx set a=’x’ and b=’x’ where …）</li>
<li><a href="https://mp.weixin.qq.com/s/snJcudytuW4_BvgVk86IXw" target="_blank" rel="noopener">一个事务中调整语句顺序</a> （MySQL45讲中也说过：一个事务中，只有需要锁的时候才会去申请锁，事务提交时才会释放锁。所以将锁资源较多的语句放在后面执行。） </li>
<li><a href="https://mp.weixin.qq.com/s/wFath89f3xXDR1Nxd5g-mw" target="_blank" rel="noopener">库表字符集修改后，老字段仍为原来字符集</a> （修改库表字符集后，只会改变新增的字符集）</li>
<li><a href="https://mp.weixin.qq.com/s/jMU1lGhBwuIPrERqeUFAVQ" target="_blank" rel="noopener">聊聊 隐式转换</a> （真实遇到过其中的字符串转换成浮点型比较，查询结果不准确的问题。实测当长度为17位时会有问题）</li>
<li><a href="https://mp.weixin.qq.com/s/tWDQUPG5PYaeZilz7dd73Q" target="_blank" rel="noopener">一个特殊的隐式转换问题</a> （5.6版本IN中包括多个类型的话，会存在不能走索引的情况。<a href="http://mysql.taobao.org/monthly/2017/12/06/" target="_blank" rel="noopener">相关阿里月报</a>）</li>
<li><a href="https://mp.weixin.qq.com/s/f8ZQx3Iuz-BnJ05z8vN2GA" target="_blank" rel="noopener">Strace 解决性能问题案例一则</a> （问题排查工具，用事实说话，DB不背锅）</li>
<li><a href="https://mp.weixin.qq.com/s/MdfomhoKV4OBJ_jSv1d0Bg" target="_blank" rel="noopener">业务优化案例一则</a> (mysqlslap压测工具使用)</li>
<li><a href="https://mp.weixin.qq.com/s/2hFm_hZgbNwi8GsE5MFrQg" target="_blank" rel="noopener">MySQL 案例一则</a> （explicit_defaults_for_timestamp参数解释）<ul>
<li>explicit_defaults_for_timestamp</li>
</ul>
</li>
<li><a href="https://mp.weixin.qq.com/s/w4qtB5Dz_ybbiY-WRr72-Q" target="_blank" rel="noopener">再说 order by 优化</a> （<font color="red">很精髓的order by案例总结和优化建议。</font>）</li>
<li><a href="https://mp.weixin.qq.com/s/T6qeXpVoo-M9Iflsh-n1zA" target="_blank" rel="noopener">一次大量删除导致 MySQL 慢查的分析</a> （由于MVCC特性，如果存在长时间未提交的事务，会导致简单查询也可能会变得很慢）</li>
<li><a href="https://mp.weixin.qq.com/s/0y20YxeSvgwJM7ZUho1C7Q" target="_blank" rel="noopener">MySQL 大量sleeping before entering InnoDB 故障诊断</a> （很详细的一次问题排查步骤，里面有很多有用的命令）</li>
<li><a href="https://mp.weixin.qq.com/s/Edn_gPwcAHo5sYIzLJghzA" target="_blank" rel="noopener">哪些因素会导致慢查询？</a> （<font color="red">从应用到数据库，非常全面的列出了变慢的原因</font> 加一个：limit 时匹配不到数据会一直扫描。）</li>
<li><a href="https://mp.weixin.qq.com/s/AC9CwpSUTW6fXA-5mHxPGQ" target="_blank" rel="noopener">由MySQL复制延迟说起</a> （分析了复制延迟的主要原因和解决办法）</li>
<li><a href="https://mp.weixin.qq.com/s/safm3DQh2zYO9Pdk9ZXbkA" target="_blank" rel="noopener">为何COUNT很慢却不写SLOW LOG</a>：slow log记录规则</li>
<li><a href="https://mp.weixin.qq.com/s/7L-aBKmjORJ7Mg72Od47lw" target="_blank" rel="noopener">故障分析 | MySQL 优化案例 - select count(*)</a></li>
</ul>
<p>SQL变慢的原因主要有：</p>
<ol>
<li>SQL执行过程走索引不合理，导致执行缓慢。</li>
<li>使用合理索引，但是获取数据量比较多。(排序，临时表等)</li>
<li>网络重传丢包导致SQL变慢。</li>
<li>并发比较高的场景，请求排队处理，等待时间长。</li>
</ol>
<p>性能优化是一个老生常谈的问题，需要对相关流程和机制有很深入的研究才能对症下药。平时扩充、积累相关知识，在遇到问题后，才会有思路。经验很重要，但更多的是建立在平时的积累上。</p>
<h2 id="死锁系列"><a href="#死锁系列" class="headerlink" title="死锁系列"></a>死锁系列</h2><ul>
<li><a href="https://mp.weixin.qq.com/s/xUgzKPMZP777jdytrCL7oA" target="_blank" rel="noopener">漫谈死锁</a> （1. RC级别下也会存在Next-key 2. RC级别下，获取到不符合记录时会释放锁）<ul>
<li>innodb_print_all_deadlocks (将死锁信息记录到errorlog中参数)</li>
<li>innodb_status_output_locks (标准监控开关参数)</li>
</ul>
</li>
<li><a href="https://mp.weixin.qq.com/s/8XXimj2AIsRWj0fF-_iz3g" target="_blank" rel="noopener">如何阅读死锁日志</a> （锁组合）</li>
<li><a href="https://mp.weixin.qq.com/s/2GIrpSKHe3Y3KWMfDbA7jw" target="_blank" rel="noopener">MySQL 各种SQL语句加锁分析</a><ul>
<li>innodb_locks_unsafe_for_binlog</li>
</ul>
</li>
<li><a href="https://mp.weixin.qq.com/s/MywiDdffz13i8auSv4Xs9w" target="_blank" rel="noopener">死锁案例一</a> （简单插入唯一索引插入意向锁案例）</li>
<li><a href="https://mp.weixin.qq.com/s/7DehY-zQV1XHYufaII4oJg" target="_blank" rel="noopener">死锁案例二</a> （delete操作会有锁区间行为。PS：删除已有记录会导致锁范围变大)</li>
<li><a href="https://mp.weixin.qq.com/s/R1dJY4leZh5qRpUkvOsNBw" target="_blank" rel="noopener">死锁案例三</a> （insert同一区间时，唯一索引的插入意向锁导致的死锁）</li>
<li><a href="https://mp.weixin.qq.com/s/wXH9XFOK8wui7dDtR6Hzww" target="_blank" rel="noopener">死锁案例四</a> （并发插入时，插入意向锁不同阶段死锁。<font color="red">注意跟案例三的区别：本案例为X锁等待，案例三为S锁等待</font>)</li>
<li><a href="https://mp.weixin.qq.com/s/XCdLfyjSuWAEcWIjbcVfvg" target="_blank" rel="noopener">死锁案例五</a> （repalce into插入死锁情况）</li>
<li><a href="https://mp.weixin.qq.com/s/Lp7b2TGyFY-4uEN_M6Y8zg" target="_blank" rel="noopener">死锁案例六</a> （不同事务加锁顺序不一样，导致锁资源交叉影响导致的死锁)</li>
<li><a href="https://mp.weixin.qq.com/s/pC4XCpUOuNPMFj6UjuhWvw" target="_blank" rel="noopener">死锁案例七</a> （RC级别下，update不存在记录会持有lock_S + GAP锁）</li>
<li><a href="https://mp.weixin.qq.com/s/96CDhpgu5uUQ7qKYhKgt3w" target="_blank" rel="noopener">死锁案例八</a> （多并发插入下的又一插入意向锁竞争导致的死锁案例）</li>
<li><a href="https://mp.weixin.qq.com/s/h4Mwrowft2KKdTkqmRlYqw" target="_blank" rel="noopener">死锁案例九</a> （并发批量插入，导致的死锁）</li>
<li><a href="https://mp.weixin.qq.com/s/b9gNbdEHV3NNQrV9PKDPSw" target="_blank" rel="noopener">死锁案例十</a> （并发更新普通二级索引造成的死锁。PS：<font color="red">另一程度上说明索引不是随便加就行</font>）</li>
<li><a href="https://mp.weixin.qq.com/s/vMGlRtMQckJ1LUZaSBn5cw" target="_blank" rel="noopener">死锁案例十一</a> （<font color="red">5.6升级到5.7后，INSERT INTO .. ON DUPLICATE KEY语句锁模式加强</font>）</li>
<li><a href="https://mp.weixin.qq.com/s/SFdPDPhI270tnVI3uuOH0Q" target="_blank" rel="noopener">死锁案例十二</a> （唯一索引，多插入,插入意向锁死锁情况）</li>
<li><a href="!https://www.cnblogs.com/yulibostu/articles/9844061.html">一个最不可思议的死锁分析</a> （并发delete语句造成的死锁情况，里面引用了很多好文章，需要细品）</li>
</ul>
<p>分析死锁单从<code>show engines innodb status</code>中往往只能看到最后执行的语句，并不能很好的了解整个死锁形成过程。所以在分析死锁时，需要先了解两个死锁事务的具体逻辑和语句过程。<br>了解MySQL不同操作的加锁过程非常重要，这是对死锁形成过程分析的基础。</p>
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<a class="post-title-link" href="/2020/07/29/new/Redis/Redis-6-0新特性-客户端缓存/" itemprop="url">Redis 6.0新特性-客户端缓存</a></h1>
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2020-07-29
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<p>你见过5点半的曼哈顿街头吗？一年前，当antirez在参加完纽约Redis大会后，5:30就在旅店中醒来了，面对曼哈顿街头的美丽景色，在芸芸众生中思索Redis的未来。包括客户端缓存。</p>
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<h2 id="简介"><a href="#简介" class="headerlink" title="简介"></a>简介</h2><p>Redis实现的是一个服务端协助的客户端缓存，叫做tracking。用法是：<br><code>CLIENT TRACKING ON|OFF [REDIRECT client-id] [PREFIX prefix] [BCAST] [OPTIN] [OPTOUT] [NOLOOP]</code><br>当tracking开启时，Redis客户端会“记住”每个请求过的key；当服务端key发生修改命令操作时，就会发送失效消息给客户端。失效消息可以通过RESP3协议发送给请求的客户端，或者转发给一个订阅频道<code>__redis__:invalidate</code>的连接。</p>
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<li>REDIRECT：将失效消息转发给另外一个客户端。当我们使用的是老的RESP2和Redis通讯时，client本身不支持处理失效消息，所以可以开启一个Pub/Sub客户端处理失效消息。</li>
<li>BCAST：使用广播模式开始tracking，在这种模式下客户端需要设置将track的key前缀，这些key的失效消息会广播给所有参与的客户端，不管这些客户端是否请求/缓存了这些key。不开启广播模式的时候，Redis只会Track那些只读命令请求的key，并且只会报告一次失效消息。</li>
<li>PREFIX：只应用了广播模式，注册一个key的前缀。所有以这个前缀开始的key有修改时，都会发送失效消息。可以注册多个前缀，如果不设置前缀，那么广播模式会track每一个key。</li>
<li>OPTIN：当广播模式没有开启时，正常不会track只读命令的key，除非它们在CLIENT CACHING yes之后被调用。</li>
<li>OPTPUT：当广播模式没有开启时，正常会track只读命令的key，除非它们在CLIENT CACHING off之后被调用。</li>
<li>NOLOOP：不发送自身修改的key失效消息给自己。</li>
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<a class="post-title-link" href="/2020/07/20/new/Redis/Redis-ACL从使用到实现/" itemprop="url">Redis ACL从使用到实现</a></h1>
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<h2 id="简介"><a href="#简介" class="headerlink" title="简介"></a>简介</h2><p>Redis ACL是6.0版本中推出的新功能。是一项可以限制用户连接可执行命令和键访问操作的功能。<br>客户端在连接服务器之后，客户端需要提供用户名和密码用于验证身份，如果验证成功，客户端连接会关联特定用户以及用户相应的权限。Redis可以配置新的客户端连接自动使用默认用户(default)进行验证(默认选项)。<br>此外，ACL功能对旧版客户端和应用都是向后兼容的，对于旧版配置用户密码的方式(requirepass)也是支持的。该命令设置的是default用户的密码，即<code>auth password</code> 等价于 <code>auth default password</code>。没有指定用户的客户端连接使用的都是default，可以通过控制defalut用户权限来兼容老版本。</p>
<h2 id="ACL使用场景"><a href="#ACL使用场景" class="headerlink" title="ACL使用场景"></a>ACL使用场景</h2><ol>
<li>你希望限制用户访问命令和键以提高安全性。不在信任列表中的用户没有权限访问，而在信任列表中的用户拥有完成工作的最小访问权限。例如一些客户端只可以执行只读的命令。</li>
<li>你希望提供运维安全。避免程序出错或者人为操作失误导致数据或者配置受到损坏。比如执行flush、keys等。在之前版本中都是通过命令重命令的方式来对使用者隐藏，但是这样可能会存在其他隐患。</li>
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<h2 id="ACL使用"><a href="#ACL使用" class="headerlink" title="ACL使用"></a>ACL使用</h2><h3 id="ACL规则"><a href="#ACL规则" class="headerlink" title="ACL规则"></a>ACL规则</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line">on：启用用户</span><br><span class="line">off：禁止用户</span><br><span class="line">+：添加命令到用户允许执行命令列表</span><br><span class="line">-：从用户允许执行命令列表删除命令</span><br><span class="line">+@：允许用户执行定义在category类别中的命令</span><br><span class="line">-@：删除用户拥有的category类别命令权限</span><br><span class="line">+|subcommand：允许用户启用一个被禁止类别下的子命令。</span><br><span class="line">allcommands：+@all 的别名. </span><br><span class="line">nocommands：-@all 的别名。</span><br><span class="line">~：添加一个键值模式的权限</span><br><span class="line">allkeys：是 ~* 的别名</span><br><span class="line">resetkeys：在键模式列表里面清空所有的键模式</span><br><span class="line">>：添加密码到用户有效密码列表里</span><br><span class="line"><：从用户有效密码列表中删除密码</span><br><span class="line">#：添加 SHA-256 形式哈希值到用户有效密码列表里</span><br><span class="line">!：从有效的密码列表中删除哈希值密码</span><br><span class="line">nopass：删除所有与用户关联的密码</span><br><span class="line">resetpass：清除用户所有密码</span><br><span class="line">reset：用户将返回和它被默认创建时同样的状态。</span><br></pre></td></tr></table></figure>
<h3 id="ACL命令使用"><a href="#ACL命令使用" class="headerlink" title="ACL命令使用"></a>ACL命令使用</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line">/* ACL -- show and modify the configuration of ACL users.</span><br><span class="line"> * ACL HELP // 获取帮助信息</span><br><span class="line"> * ACL LOAD // 从外部ACL文件导入用户信息</span><br><span class="line"> * ACL LIST // 所有用户权限信息</span><br><span class="line"> * ACL USERS // 所有用户的列表</span><br><span class="line"> * ACL CAT [<category>] // 命令分类，及分类下的具体命令列表</span><br><span class="line"> * ACL SETUSER <username> ... acl rules ... // 添加用户、权限修改等操作</span><br><span class="line"> * ACL DELUSER <username> [...] // 删除用户</span><br><span class="line"> * ACL GETUSER <username> // 获取指定用户的信息</span><br><span class="line"> * ACL GENPASS // 生成一个密码</span><br><span class="line"> * ACL WHOAMI // 获取当前用户</span><br><span class="line"> */</span><br></pre></td></tr></table></figure>
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