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itemtype="http://schema.org/Organization"><meta itemprop="name" content="涛声依旧"></span><div class="body md" itemprop="articleBody"><h4 id="主服务"><a class="anchor" href="#主服务">#</a> 主服务</h4><ol><li>基础配置</li></ol><figure class="highlight yaml"><figcaption data-lang="YAML"></figcaption><table><tr><td data-num="1"></td><td><pre>port 6379</pre></td></tr><tr><td data-num="2"></td><td><pre>requirepass 123456密码建议不设置</pre></td></tr><tr><td data-num="3"></td><td><pre>vm<span class="token punctuation">-</span>enabled no (虚拟内存,内存够的情况下可以不使用)</pre></td></tr><tr><td data-num="4"></td><td><pre>maxmemory 1GB告诉Redis当使用了多少物理内存后就开始拒绝后续的写入</pre></td></tr><tr><td data-num="5"></td><td><pre>bind 127.0.0.1 (注释掉,否则不能外部连接)</pre></td></tr><tr><td data-num="6"></td><td><pre>rdbchecksum no持久化数据检查</pre></td></tr><tr><td data-num="7"></td><td><pre>list<span class="token punctuation">-</span>max<span class="token punctuation">-</span>ziplist<span class="token punctuation">-</span>size 1024ziplist的最大容量正数为自己指定的大小。负数<span class="token punctuation">-</span>1到<span class="token punctuation">-</span>5为对应的值4到64Kb</pre></td></tr><tr><td data-num="8"></td><td><pre>list<span class="token punctuation">-</span>compress<span class="token punctuation">-</span>depth 20quicklist的两端多少个node不压缩0为全部不压缩</pre></td></tr></table></figure><figure class="highlight bash"><figcaption data-lang="bash"></figcaption><table><tr><td data-num="1"></td><td><pre><span class="token function">sysctl</span> <span class="token assign-left variable">vm.overcommit_memory</span><span class="token operator">=</span><span class="token number">1</span> (立即生效)</pre></td></tr><tr><td data-num="2"></td><td><pre>修改/etc/sysctl.conf添加vm.overcommit_memory<span class="token operator">=</span><span class="token number">1</span>表示内核允许分配所有的物理内存而不管当前的内存状态如何。Redis的RDB持久化实现是folk一个子进程然后让子进程将内存镜像dump到RDB文件中。理论上来说是需要跟父进程一样的内存空间但是由于linux很早就支持的copy-on-write技术所以实际上并不需要这么多的物理内存的。</pre></td></tr></table></figure><ol start="2"><li>禁用透明大页(影响性能)</li></ol><figure class="highlight bash"><figcaption data-lang="bash"></figcaption><table><tr><td data-num="1"></td><td><pre>需要sudo <span class="token function">su</span> 切换到root身份sudo 没用)</pre></td></tr><tr><td data-num="2"></td><td><pre><span class="token builtin class-name">echo</span> never <span class="token operator">></span> /sys/kernel/mm/transparent_hugepage/enabled</pre></td></tr><tr><td data-num="3"></td><td><pre>修改/etc/init.d/redis-server加入/bin/echo never <span class="token operator">></span> /sys/kernel/mm/transparent_hugepage/enabled</pre></td></tr></table></figure><ol start="3"><li>修复 TCP 警告</li></ol><figure class="highlight bash"><figcaption data-lang="bash"></figcaption><table><tr><td data-num="1"></td><td><pre><span class="token function">sysctl</span> <span class="token assign-left variable">net.core.somaxconn</span><span class="token operator">=</span><span class="token number">1024</span>(立即生效)</pre></td></tr><tr><td data-num="2"></td><td><pre>修改/etc/sysctl.conf添加net.core.somaxconn<span class="token operator">=</span><span class="token number">1024</span></pre></td></tr></table></figure><ol start="4"><li>客户端缓冲区限制</li></ol><figure class="highlight yaml"><figcaption data-lang="YAML"></figcaption><table><tr><td data-num="1"></td><td><pre>客户端的输出缓冲区的限制,因为某种原因客户端从服务器读取数据的速度不够快,可用于强制断开连接(一个常见的原因是一个发布 / 订阅客户端消费消息的速度无法赶上生产它们的速度)。</pre></td></tr><tr><td data-num="2"></td><td><pre>可以三种不同客户端的方式进行设置:</pre></td></tr><tr><td data-num="3"></td><td><pre>normal <span class="token punctuation">-</span><span class="token punctuation">></span> 正常客户端</pre></td></tr><tr><td data-num="4"></td><td><pre>slave <span class="token punctuation">-</span><span class="token punctuation">></span> slave 和 MONITOR 客户端</pre></td></tr><tr><td data-num="5"></td><td><pre>pubsub <span class="token punctuation">-</span><span class="token punctuation">></span> 至少订阅了一个 pubsub channel 或 pattern 的客户端</pre></td></tr><tr><td data-num="6"></td><td><pre><span class="token key atrule">语法</span> <span class="token punctuation">:</span></pre></td></tr><tr><td data-num="7"></td><td><pre>client<span class="token punctuation">-</span>output<span class="token punctuation">-</span>buffer<span class="token punctuation">-</span>limit &lt;class<span class="token punctuation">></span>&lt;hard limit<span class="token punctuation">></span> &lt;soft limit<span class="token punctuation">></span> &lt;soft seconds<span class="token punctuation">></span></pre></td></tr><tr><td data-num="8"></td><td><pre>一旦达到硬限制客户端会立即断开,或者达到软限制并保持达成的指定秒数(连续)。</pre></td></tr><tr><td data-num="9"></td><td><pre>例如,如果硬限制为 32 兆字节和软限制为 16 兆字节 /10 秒,客户端将会立即断开。如果输出缓冲区的大小达到 32 兆字节,客户端达到 16 兆字节和连续超过了限制 10 秒,也将断开连接。默认 normal 客户端不做限制,因为他们在一个请求后未要求时(以推的方式)不接收数据,</pre></td></tr><tr><td data-num="10"></td><td><pre>只有异步客户端可能会出现请求数据的速度比它可以读取的速度快的场景。</pre></td></tr><tr><td data-num="11"></td><td><pre>把硬限制和软限制都设置为 0 来禁用该特性</pre></td></tr><tr><td data-num="12"></td><td><pre>client<span class="token punctuation">-</span>output<span class="token punctuation">-</span>buffer<span class="token punctuation">-</span>limit normal 0 0 0</pre></td></tr><tr><td data-num="13"></td><td><pre>client<span class="token punctuation">-</span>output<span class="token punctuation">-</span>buffer<span class="token punctuation">-</span>limit slave 5gb 512mb 60</pre></td></tr><tr><td data-num="14"></td><td><pre>client<span class="token punctuation">-</span>output<span class="token punctuation">-</span>buffer<span class="token punctuation">-</span>limit pubsub 32mb 8mb 60</pre></td></tr></table></figure><ol start="5"><li>持久化配置</li></ol><figure class="highlight yaml"><figcaption data-lang="YAML"></figcaption><table><tr><td data-num="1"></td><td><pre><span class="token punctuation">---</span>关闭RDB持久化<span class="token punctuation">---</span></pre></td></tr><tr><td data-num="2"></td><td><pre>save ""</pre></td></tr><tr><td data-num="3"></td><td><pre>默认配置如下:</pre></td></tr><tr><td data-num="4"></td><td><pre>save 900 1 <span class="token comment">#900 秒内有 1 次更新就持久化</span></pre></td></tr><tr><td data-num="5"></td><td><pre>save 300 10 <span class="token comment">#300 秒内有 10 次更新就持久化</span></pre></td></tr><tr><td data-num="6"></td><td><pre>save 60 10000 <span class="token comment">#60 秒内有 10000 次更新就持久化</span></pre></td></tr><tr><td data-num="7"></td><td><pre><span class="token punctuation">---</span>关闭RDB持久化<span class="token punctuation">---</span></pre></td></tr><tr><td data-num="8"></td><td><pre>主从同步支持两种策略即disk和socket方式。</pre></td></tr><tr><td data-num="9"></td><td><pre>新的slave端和重连的salve端不允许去继续同步进程这被称之为“完全同步”。</pre></td></tr><tr><td data-num="10"></td><td><pre>一个RDB文件从master端传到slave端分为两种情况</pre></td></tr><tr><td data-num="11"></td><td><pre>1、支持diskmaster端将RDB file写到disk稍后再传送到slave端</pre></td></tr><tr><td data-num="12"></td><td><pre>2、无磁盘disklessmaster端直接将RDB file传到slave socket不需要与disk进行交互。无磁盘diskless方式适合磁盘读写速度慢但网络带宽非常高的环境。</pre></td></tr><tr><td data-num="13"></td><td><pre>repl<span class="token punctuation">-</span>diskless<span class="token punctuation">-</span>sync no 默认不使用diskless同步方式</pre></td></tr><tr><td data-num="14"></td><td><pre>repl<span class="token punctuation">-</span>diskless<span class="token punctuation">-</span>sync<span class="token punctuation">-</span>delay 30 无磁盘diskless方式在进行数据传递之前会有一个时间的延迟以便slave端能够进行到待传送的目标队列中这个时间默认是5秒</pre></td></tr><tr><td data-num="15"></td><td><pre>repl<span class="token punctuation">-</span>ping<span class="token punctuation">-</span>slave<span class="token punctuation">-</span>period 60 slave端向server端发送pings的时间区间设置默认为10秒</pre></td></tr><tr><td data-num="16"></td><td><pre>repl<span class="token punctuation">-</span>timeout 3600 设置超时时间</pre></td></tr><tr><td data-num="17"></td><td><pre>repl<span class="token punctuation">-</span>disable<span class="token punctuation">-</span>tcp<span class="token punctuation">-</span>nodelay no 是否启用TCP_NODELAY如果启用则会使用少量的TCP包和带宽去进行数据传输到slave端当然速度会比较慢如果不启用则传输速度比较快但是会占用比较多的带宽。</pre></td></tr><tr><td data-num="18"></td><td><pre>repl<span class="token punctuation">-</span>backlog<span class="token punctuation">-</span>size 1mb 设置backlog的大小backlog是一个缓冲区在slave端失连时存放要同步到slave的数据因此当一个slave要重连时经常是不需要完全同步的执行局部同步就足够了。</pre></td></tr><tr><td data-num="19"></td><td><pre>backlog设置的越大slave可以失连的时间就越长。</pre></td></tr><tr><td data-num="20"></td><td><pre>repl<span class="token punctuation">-</span>backlog<span class="token punctuation">-</span>ttl 3600 如果一段时间后没有slave连接到master则backlog size的内存将会被释放。如果值为0则表示永远不释放这部份内存。</pre></td></tr><tr><td data-num="21"></td><td><pre>slave<span class="token punctuation">-</span>priority 100 slave端的优先级设置值是一个整数数字越小表示优先级越高。当master故障时将会按照优先级来选择slave端进行恢复如果值设置为0则表示该slave永远不会被选择。</pre></td></tr><tr><td data-num="22"></td><td><pre>min<span class="token punctuation">-</span>slaves<span class="token punctuation">-</span>to<span class="token punctuation">-</span>write 3</pre></td></tr><tr><td data-num="23"></td><td><pre>min<span class="token punctuation">-</span>slaves<span class="token punctuation">-</span>max<span class="token punctuation">-</span>lag 10 设置当一个master端的可用slave少于N个延迟时间大于M秒时不接收写操作。</pre></td></tr></table></figure><h4 id="从服务"><a class="anchor" href="#从服务">#</a> 从服务</h4><figure class="highlight yaml"><figcaption data-lang="YAML"></figcaption><table><tr><td data-num="1"></td><td><pre>基本配置同主服务一致</pre></td></tr><tr><td data-num="2"></td><td><pre>slaveof 127.0.0.1 6379主redis的ip和端口</pre></td></tr><tr><td data-num="3"></td><td><pre>masterauth 123456 (主redis的密码)</pre></td></tr><tr><td data-num="4"></td><td><pre>可以通过slaveof no one命令将Slaver升级为Maste</pre></td></tr><tr><td data-num="5"></td><td><pre>bgsave 持久化命令在redis<span class="token punctuation">-</span>cli中执行默认创建dump.rdb文件路径为 /var/lib/redis/dump.rdb。可通过find / <span class="token punctuation">-</span>name dump.rd查找</pre></td></tr></table></figure><h4 id="相关命令"><a class="anchor" href="#相关命令">#</a> 相关命令</h4><figure class="highlight bash"><figcaption data-lang="bash"></figcaption><table><tr><td data-num="1"></td><td><pre>看状态</pre></td></tr><tr><td data-num="2"></td><td><pre><span class="token function">sudo</span> /etc/init.d/redis-server status</pre></td></tr><tr><td data-num="3"></td><td><pre>看端口</pre></td></tr><tr><td data-num="4"></td><td><pre><span class="token function">netstat</span> -nlt<span class="token operator">|</span><span class="token function">grep</span> <span class="token number">6379</span></pre></td></tr><tr><td data-num="5"></td><td><pre>外部连接</pre></td></tr><tr><td data-num="6"></td><td><pre><span class="token function">sudo</span> <span class="token function">vim</span> /etc/redis/redis.conf把protected-mode改为no把bind ip注释掉</pre></td></tr><tr><td data-num="7"></td><td><pre>重启</pre></td></tr><tr><td data-num="8"></td><td><pre><span class="token function">sudo</span> server redis-server restart</pre></td></tr><tr><td data-num="9"></td><td><pre>查看内存</pre></td></tr><tr><td data-num="10"></td><td><pre><span class="token function">free</span> <span class="token parameter variable">-m</span></pre></td></tr><tr><td data-num="11"></td><td><pre>批量删除指定key</pre></td></tr><tr><td data-num="12"></td><td><pre>redis-cli <span class="token parameter variable">-n</span> <span class="token number">6</span> scan <span class="token number">0</span> match *2020-06-12 count <span class="token number">10000</span><span class="token operator">|</span> <span class="token function">xargs</span> redis-cli <span class="token parameter variable">-n</span> <span class="token number">6</span> del</pre></td></tr><tr><td data-num="13"></td><td><pre>大量删除key后快速释放被占用的内存</pre></td></tr><tr><td data-num="14"></td><td><pre>memory purge</pre></td></tr></table></figure><h4 id="问题解决"><a class="anchor" href="#问题解决">#</a> 问题解决</h4><figure class="highlight bash"><figcaption data-lang="bash"></figcaption><table><tr><td data-num="1"></td><td><pre>写入问题</pre></td></tr><tr><td data-num="2"></td><td><pre>redis-cli config <span class="token builtin class-name">set</span> stop-writes-on-bgsave-error no</pre></td></tr><tr><td data-num="3"></td><td><pre><span class="token function">sudo</span> <span class="token function">vim</span> /etc/redis/redis.conf把stop-writes-on-bgsave-error改为no</pre></td></tr><tr><td data-num="4"></td><td><pre>修改系统 <span class="token function">sudo</span> <span class="token function">vim</span> /etc/sysctl.conf加入vm.overcommit_memory<span class="token operator">=</span><span class="token number">1</span></pre></td></tr><tr><td data-num="5"></td><td><pre><span class="token function">sudo</span> <span class="token function">sysctl</span> <span class="token assign-left variable">vm.overcommit_memory</span><span class="token operator">=</span><span class="token number">1</span></pre></td></tr></table></figure><div class="tags"><a href="/tags/redis/" rel="tag"><i class="ic i-tag"></i> 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