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<!DOCTYPE html>
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<a href="/categories/服务器相关问题&备忘"><b>「
</b>服务器相关问题&备忘<b> 」</b></a>
三月 22, 2021
</p>
<h3 class="post-title animated fadeInDown">
<a href="/posts/9237cc38/" title="RedHat 更换 CentOS 源出现的坑" class="posttitle">RedHat 更换 CentOS 源出现的坑</a></h3>
<p class="post-count animated fadeInDown">
<span>
<b class="iconfont icon-text2"></b> <i>文章字数</i>
3.3k
</span>
<span>
<b class="iconfont icon-timer__s"></b> <i>阅读约需</i>
3 mins.
</span>
<span id="/posts/9237cc38/" class="leancloud_visitors" data-flag-title="">
<b class="iconfont icon-read"></b> <i>阅读次数</i>
<span class="leancloud-visitors-count">1000000</span>
</span>
</p>
<ul class="animated fadeInDown post-tags-list"><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/Linux/">Linux</a></li></ul>
<div class="md-content animated fadeIn">
<p>今天在客户服务器上部署的时候需要用到某第三方源，但网上提供的只有 CentOS 源，没有用户 RedHat 系统的相关源。在网上查了很多方法，都说卸载 yum 再重装就可以解决，但是并没有解决。 发现...</p>
<span class="read-more"><a href="/posts/9237cc38/" title="查看全文" class="posttitle">查看全文</a>
<b class="iconfont icon-arrow-right- gradient-text"></b></span>
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<div class="post" id="post">
<div class="post-cover animated fadeIn" style="
background-image:
radial-gradient(ellipse closest-side, rgba(0, 0, 0, 0.65), #100e17),
url(/img/welcome-cover.jpg);">
</div>
<div class="else">
<p class="animated fadeInDown">
<a href="/categories/不知道怎么归类">
<b>「 </b>不知道怎么归类<b> 」</b>
</a>
二月 03, 2021
</p>
<h3 class="post-title animated fadeInDown"><a href="/posts/55916608/" title="F**K ZZZQ - 记录那些因政治正确而改名的技术" class="posttitle">F**K ZZZQ - 记录那些因政治正确而改名的技术</a></h3>
<p class="post-count animated fadeInDown">
<span>
<b class="iconfont icon-text2"></b> <i>文章字数</i>
1.1k
</span>
<span>
<b class="iconfont icon-timer__s"></b> <i>阅读约需</i>
1 mins.
</span>
<span id="/posts/55916608/" class="leancloud_visitors" data-flag-title="">
<b class="iconfont icon-read"></b> <i>阅读次数</i>
<span class="leancloud-visitors-count">1000000</span>
</span>
</p>
<ul class="animated fadeInDown post-tags-list"><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/Git/">Git</a></li></ul>
<div class="md-content animated fadeIn">
<p>请允许我首先给出一个和善而不失礼貌的微笑 :) 以纪念因为这些莫名其妙的事而浪费的时间。</p>
<blockquote>
<p>在今年早些时候乔治-弗洛伊德（George Floyd）的惨死和BLM抗议活动之后，科技公司希望通过放弃master、slave、blacklist和whitelist等非包容性术语来表达对黑人社区的支持。</p>
</blockquote>
<p>主分支从 master 改为 main</p>
<blockquote>
<p>适用范围: 目前新建的项目已修改，老项目不做变更</p>
</blockquote>
<p><strong>目前的变化</strong></p>
<ul>
<li>将 master-slave 架构的描述改为 master-replica</li>
<li>为 SLAVEOF...</li></ul>
<span class="read-more"><a href="/posts/55916608/" title="查看全文" class="posttitle">查看全文</a> <b class="iconfont icon-arrow-right- gradient-text"></b></span>
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<div class="post" id="post">
<div class="post-cover animated fadeIn" style="
background-image:
radial-gradient(ellipse closest-side, rgba(0, 0, 0, 0.65), #100e17),
url(/img/welcome-cover.jpg);">
</div>
<div class="else">
<p class="animated fadeInDown">
<a href="/categories/不知道怎么归类">
<b>「 </b>不知道怎么归类<b> 」</b>
</a>
十二月 30, 2020
</p>
<h3 class="post-title animated fadeInDown"><a href="/posts/ba43525b/" title="记录一次celery消费失败的问题排除" class="posttitle">记录一次celery消费失败的问题排除</a></h3>
<p class="post-count animated fadeInDown">
<span>
<b class="iconfont icon-text2"></b> <i>文章字数</i>
1.2k
</span>
<span>
<b class="iconfont icon-timer__s"></b> <i>阅读约需</i>
1 mins.
</span>
<span id="/posts/ba43525b/" class="leancloud_visitors" data-flag-title="">
<b class="iconfont icon-read"></b> <i>阅读次数</i>
<span class="leancloud-visitors-count">1000000</span>
</span>
</p>
<ul class="animated fadeInDown post-tags-list"><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/Linux/">Linux</a></li><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/celery/">celery</a></li><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/k8s/">k8s</a></li><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/rabbitmq/">rabbitmq</a></li></ul>
<div class="md-content animated fadeIn">
<p>昨天发完UAT后，今天惯例点进UAT看看服务的情况，突然发现<code>flower</code>监测的<code>celery</code>竟然有半数以上的失败！</p>
<p></p>
<p>马上查看这个<code>queue</code>的日志，确实是有一堆失败的。</p>
<p></p>
<p>当前这个<code>queue</code>的业务是从<code>redis</code>里把数据取出来写入<code>minio</code>里落盘，但是涉及的数据均为几十k的数据，讲道理不应该会失败。</p>
<p>查询得到这几个失败的任务<code>redis</code> key的插入时间为<code>2020-12-28 15:17:48</code>，而消费的时间却是<code>2020-12-29 17:17:21</code></p>
<p></p>
<p>这里就出现了一个问题，业务逻辑上当一个key塞入<code>redis...</code></p>
<span class="read-more"><a href="/posts/ba43525b/" title="查看全文" class="posttitle">查看全文</a> <b class="iconfont icon-arrow-right- gradient-text"></b></span>
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</div>
</div>
<div class="post" id="post">
<div class="post-cover animated fadeIn" style="
background-image:
radial-gradient(ellipse closest-side, rgba(0, 0, 0, 0.65), #100e17),
url(/img/welcome-cover.jpg);">
</div>
<div class="else">
<p class="animated fadeInDown">
<a href="/categories/工作之余">
<b>「 </b>工作之余<b> 」</b>
</a>
十月 11, 2020
</p>
<h3 class="post-title animated fadeInDown"><a href="/posts/38ad339f/" title="群晖中使用破解版 emby" class="posttitle">群晖中使用破解版 emby</a></h3>
<p class="post-count animated fadeInDown">
<span>
<b class="iconfont icon-text2"></b> <i>文章字数</i>
1.6k
</span>
<span>
<b class="iconfont icon-timer__s"></b> <i>阅读约需</i>
1 mins.
</span>
<span id="/posts/38ad339f/" class="leancloud_visitors" data-flag-title="">
<b class="iconfont icon-read"></b> <i>阅读次数</i>
<span class="leancloud-visitors-count">1000000</span>
</span>
</p>
<ul class="animated fadeInDown post-tags-list"><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/群晖/">群晖</a></li></ul>
<div class="md-content animated fadeIn">
<p>本文基本来源 <a href="https://neko.re/" target="_blank" rel="noopener">Yukino’s 理想乡</a> 的 <a href="https://neko.re/archives/128.html" target="_blank" rel="noopener">emby 破解版完全食用方法</a></p>
<p>但是文中没有提供 docker 版的安装方法和相关配置！！所以这里完善一下！</p>
<p>套件版方案使用起来很舒服，但是需要 fan 墙刮削。docker 版可以以一种巧妙的方式刮削，但是配置起来麻烦。</p>
<ol>
<li><p>因为使用 emby 套件源，在国内难以访问，<a href="https://emby.media/synology-server.html" target="_blank" rel="noopener">所以我们从官网上下载 emby 并安装</a></p>
</li>
<li><p>安装好后关闭 emby</p>
</li>
<li><p>使用脚本破解 <code>wget https://neko.re/wp-content/uploads/simple-file-list...</code></p></li></ol>
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<p class="animated fadeInDown">
<a href="/categories/工作之余">
<b>「 </b>工作之余<b> 」</b>
</a>
十月 11, 2020
</p>
<h3 class="post-title animated fadeInDown"><a href="/posts/304b0279/" title="解决群晖使用百度云docker镜像提示登陆过期的问题" class="posttitle">解决群晖使用百度云docker镜像提示登陆过期的问题</a></h3>
<p class="post-count animated fadeInDown">
<span>
<b class="iconfont icon-text2"></b> <i>文章字数</i>
732
</span>
<span>
<b class="iconfont icon-timer__s"></b> <i>阅读约需</i>
1 mins.
</span>
<span id="/posts/304b0279/" class="leancloud_visitors" data-flag-title="">
<b class="iconfont icon-read"></b> <i>阅读次数</i>
<span class="leancloud-visitors-count">1000000</span>
</span>
</p>
<ul class="animated fadeInDown post-tags-list"><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/群晖/">群晖</a></li></ul>
<div class="md-content animated fadeIn">
<p>群晖中使用的百度套件是基于<code>VNC + Linux版百度云</code>打包的docker镜像实现的，但是作者因为稳定性原因通过修改检测更新的hosts方法将百度云版本锁定在3.0.1.2版本。可是这在部分机器上不生效，那么我们反之道而行，自己更新容器里的百度云版本。</p>
<ol>
<li><p>去百度云官网下载<code>.deb</code>版百度云: <a href="https://pan.baidu.com/download" target="_blank" rel="noopener">下载地址</a></p>
</li>
<li><p>将下好的镜像放到群晖已挂载的<code>baidudownload</code>文件夹里</p>
</li>
<li><p>进入容器中的<code>baidudownload</code>目录</p>
</li>
<li><p>执行 <code>sudo dpkg -i baidunetdisk_3.4.1_amd64.deb...</code></p></li></ol>
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<p class="animated fadeInDown">
<a href="/categories/知识储备">
<b>「 </b>知识储备<b> 」</b>
</a>
九月 29, 2020
</p>
<h3 class="post-title animated fadeInDown"><a href="/posts/c6f5fe28/" title="Python 中的上下文管理" class="posttitle">Python 中的上下文管理</a></h3>
<p class="post-count animated fadeInDown">
<span>
<b class="iconfont icon-text2"></b> <i>文章字数</i>
6k
</span>
<span>
<b class="iconfont icon-timer__s"></b> <i>阅读约需</i>
5 mins.
</span>
<span id="/posts/c6f5fe28/" class="leancloud_visitors" data-flag-title="">
<b class="iconfont icon-read"></b> <i>阅读次数</i>
<span class="leancloud-visitors-count">1000000</span>
</span>
</p>
<ul class="animated fadeInDown post-tags-list"><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/Python/">Python</a></li></ul>
<div class="md-content animated fadeIn">
<p>当我们执行语句块前需要一些准备动作，在执行完成之后又需要执行一些收尾动作。比如：文件读写后需要关闭，数据库读写完毕后需要关闭连接，资源加锁解锁等情况。对于这种情况 python 提供了上下文管理的概念，可以通过上下文管理器处理代码块执行前的准备动作，以及执行后的收尾动作。</p>
<p>先来看看不使用上下文管理器的情况</p>
<pre><code class="python">f = open("log.txt", "w")
try:
f.write("hello")
finally:
f.close()
...</code></pre>
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<a href="/categories/机器学习笔记">
<b>「 </b>机器学习笔记<b> 」</b>
</a>
九月 22, 2020
</p>
<h3 class="post-title animated fadeInDown"><a href="/posts/1b5a6244/" title="Spark vs Dask Python生态下的计算引擎" class="posttitle">Spark vs Dask Python生态下的计算引擎</a></h3>
<p class="post-count animated fadeInDown">
<span>
<b class="iconfont icon-text2"></b> <i>文章字数</i>
3.7k
</span>
<span>
<b class="iconfont icon-timer__s"></b> <i>阅读约需</i>
3 mins.
</span>
<span id="/posts/1b5a6244/" class="leancloud_visitors" data-flag-title="">
<b class="iconfont icon-read"></b> <i>阅读次数</i>
<span class="leancloud-visitors-count">1000000</span>
</span>
</p>
<ul class="animated fadeInDown post-tags-list"><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/Python/">Python</a></li><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/dask/">dask</a></li><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/spark/">spark</a></li><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/机器学习/">机器学习</a></li><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/计算引擎/">计算引擎</a></li></ul>
<div class="md-content animated fadeIn">
<blockquote>
<p>本文基于<a href="https://databricks.com/speaker/gurpreet-singh" target="_blank" rel="noopener">Gurpreet Singh</a>大佬在 Spark+AI SUMMIT 2020 的<a href="https://databricks.com/session/dask-and-apache-spark" target="_blank" rel="noopener">公开课</a>编写</p>
</blockquote>
<p>对于 Python 环境下开发的数据科学团队，Dask 为分布式分析指出了非常明确的道路，但是事实上大家都选择了 Spark 来达成相同的目的。Dask 是一个纯 Python 框架，它允许在本地或集群上运行相同的 Pandas 或 Numpy 代码。而 Spark 即时使用了 Apache 的 pySpark 包装器，仍然带来了学习门槛，其中涉及新的 API 和执行模型。鉴于以上陈述，我们下...</p>
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<p class="animated fadeInDown">
<a href="/categories/小项目">
<b>「 </b>小项目<b> 」</b>
</a>
九月 05, 2020
</p>
<h3 class="post-title animated fadeInDown"><a href="/posts/cdf378fe/" title="在线、离线激活鉴权实战" class="posttitle">在线、离线激活鉴权实战</a></h3>
<p class="post-count animated fadeInDown">
<span>
<b class="iconfont icon-text2"></b> <i>文章字数</i>
4.9k
</span>
<span>
<b class="iconfont icon-timer__s"></b> <i>阅读约需</i>
4 mins.
</span>
<span id="/posts/cdf378fe/" class="leancloud_visitors" data-flag-title="">
<b class="iconfont icon-read"></b> <i>阅读次数</i>
<span class="leancloud-visitors-count">1000000</span>
</span>
</p>
<ul class="animated fadeInDown post-tags-list"><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/python/">python</a></li><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/业务设计/">业务设计</a></li><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/小项目/">小项目</a></li></ul>
<div class="md-content animated fadeIn">
<p>实现一个客户端通过给与的指定激活码，激活仅限当前机器使用具体软件的功能。客户端可能处于<strong>能连接互联网</strong>和<strong>无法连接互联网</strong>两种情况。同时均要实现在指定时间使权限过期的功能，激活码在使用时才开始计时。</p>
<p>这个就非常简单了，使用最简单的哈希加盐就可以实现了，与正常 REST 接口的哈希加盐验证只有，验证服务器端需要预先存好设置的激活码这一步。</p>
<p>激活码有效期就通过一个取巧的方法，将有效期的秒数转换成16进制，埋藏在序列号的指定段上。<br>在将当前时间和过期时间一起加盐，实现用户无法通过修改或锁定系统时间破解我们的系统...</p>
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<p class="animated fadeInDown">
<a href="/categories/知识储备">
<b>「 </b>知识储备<b> 」</b>
</a>
八月 31, 2020
</p>
<h3 class="post-title animated fadeInDown"><a href="/posts/65161822/" title="Redis 主从复制 哨兵模式实战" class="posttitle">Redis 主从复制 哨兵模式实战</a></h3>
<p class="post-count animated fadeInDown">
<span>
<b class="iconfont icon-text2"></b> <i>文章字数</i>
3.8k
</span>
<span>
<b class="iconfont icon-timer__s"></b> <i>阅读约需</i>
3 mins.
</span>
<span id="/posts/65161822/" class="leancloud_visitors" data-flag-title="">
<b class="iconfont icon-read"></b> <i>阅读次数</i>
<span class="leancloud-visitors-count">1000000</span>
</span>
</p>
<ul class="animated fadeInDown post-tags-list"><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/redis/">redis</a></li><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/高可用/">高可用</a></li></ul>
<div class="md-content animated fadeIn">
<p>项目中因为并发不是很高一直偷懒用的单节点 Redis ，但是有很多大 key 写入的场景，这样会影响读性能，于是准备做主从复制，顺便做一下哨兵模式。</p>
<p>这里很简单，只需要配置<code>slaveof <masterip> <masterport></code>参数即可实现。</p>
<blockquote>
<p>注： Redis 5.0 版本后建议使用<code>replicaof</code>代替<code>slaveof</code>。 因为奇妙的<code>政治正确</code>原因，迫使作者修改了配置名，虽然<code>slaveof</code>仍能使用，但是只是暂时的兼容方案。</p>
</blockquote>
<p>修改后重启 Redis 查看配置显示, 表...</p>
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<a href="/categories/LeetCode刷题总结">
<b>「 </b>LEETCODE刷题总结<b> 」</b>
</a>
八月 28, 2020
</p>
<h3 class="post-title animated fadeInDown"><a href="/posts/5cb682e4/" title="算法题基本框架 - Python实现" class="posttitle">算法题基本框架 - Python实现</a></h3>
<p class="post-count animated fadeInDown">
<span>
<b class="iconfont icon-text2"></b> <i>文章字数</i>
11k
</span>
<span>
<b class="iconfont icon-timer__s"></b> <i>阅读约需</i>
10 mins.
</span>
<span id="/posts/5cb682e4/" class="leancloud_visitors" data-flag-title="">
<b class="iconfont icon-read"></b> <i>阅读次数</i>
<span class="leancloud-visitors-count">1000000</span>
</span>
</p>
<ul class="animated fadeInDown post-tags-list"><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/LeetCode/">LeetCode</a></li><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/Python/">Python</a></li><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/二叉树/">二叉树</a></li><li class="animated fadeInDown post-tags-list-item"><a class="animated fadeInDown post-tags-list-link" href="/tags/数据结构/">数据结构</a></li></ul>
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<blockquote>
<p>二叉搜索树的中序遍历即为这棵树叶子节点值从小到大的排列</p>
</blockquote>
<pre><code class="python">def dfs(root: TreeNode):
if not root:
return
# 先序遍历
dfs(root.left)
# 中序遍历
dfs(root.right)
# 后续遍历
</code></pre>
<pre><code class="python"> from collections import deque
def bfs(root: TreeNode, target: TreeNode):
queue = deque()
# 记录访问的节点避免走回头路
vistied = []
# 起...</code></pre>
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