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<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=2">
<meta name="theme-color" content="#222">
<meta name="generator" content="Hexo 5.4.0">
<link rel="apple-touch-icon" sizes="180x180" href="/images/apple-touch-icon-next.png">
<link rel="icon" type="image/png" sizes="32x32" href="/images/favicon-32x32-next.png">
<link rel="icon" type="image/png" sizes="16x16" href="/images/favicon-16x16-next.png">
<link rel="mask-icon" href="/images/logo.svg" color="#222">
<link rel="stylesheet" href="/css/main.css">
<link rel="stylesheet" href="//cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free@5.14.0/css/all.min.css">
<link rel="stylesheet" href="//cdn.jsdelivr.net/npm/animate.css@3.1.1/animate.min.css">
<script class="hexo-configurations">
var NexT = window.NexT || {};
var CONFIG = {"hostname":"example.com","root":"/","scheme":"Gemini","version":"8.0.0","exturl":false,"sidebar":{"position":"left","display":"always","padding":18,"offset":12},"copycode":false,"bookmark":{"enable":false,"color":"#222","save":"auto"},"fancybox":false,"mediumzoom":false,"lazyload":false,"pangu":false,"comments":{"style":"tabs","active":null,"storage":true,"lazyload":false,"nav":null},"motion":{"enable":true,"async":false,"transition":{"post_block":"fadeIn","post_header":"fadeInDown","post_body":"fadeInDown","coll_header":"fadeInLeft","sidebar":"fadeInUp"}},"prism":false,"i18n":{"placeholder":"搜索...","empty":"没有找到任何搜索结果：${query}","hits_time":"找到 ${hits} 个搜索结果（用时 ${time} 毫秒）","hits":"找到 ${hits} 个搜索结果"}};
</script>
<meta name="description" content="Blog信息">
<meta property="og:type" content="website">
<meta property="og:title" content="Junedayday Blog">
<meta property="og:url" content="http://example.com/index.html">
<meta property="og:site_name" content="Junedayday Blog">
<meta property="og:description" content="Blog信息">
<meta property="og:locale" content="zh_CN">
<meta property="article:author" content="Junedayday">
<meta name="twitter:card" content="summary">
<link rel="canonical" href="http://example.com/">
<script class="page-configurations">
// https://hexo.io/docs/variables.html
CONFIG.page = {
sidebar: "",
isHome : true,
isPost : false,
lang : 'zh-CN'
};
</script>
<title>Junedayday Blog</title>
<noscript>
<style>
body { margin-top: 2rem; }
.use-motion .menu-item,
.use-motion .sidebar,
.use-motion .post-block,
.use-motion .pagination,
.use-motion .comments,
.use-motion .post-header,
.use-motion .post-body,
.use-motion .collection-header {
visibility: visible;
}
.use-motion .header,
.use-motion .site-brand-container .toggle,
.use-motion .footer { opacity: initial; }
.use-motion .site-title,
.use-motion .site-subtitle,
.use-motion .custom-logo-image {
opacity: initial;
top: initial;
}
.use-motion .logo-line {
transform: scaleX(1);
}
.search-pop-overlay, .sidebar-nav { display: none; }
.sidebar-panel { display: block; }
</style>
</noscript>
</head>
<body itemscope itemtype="http://schema.org/WebPage" class="use-motion">
<div class="headband"></div>
<main class="main">
<header class="header" itemscope itemtype="http://schema.org/WPHeader">
<div class="header-inner"><div class="site-brand-container">
<div class="site-nav-toggle">
<div class="toggle" aria-label="切换导航栏">
</div>
</div>
<div class="site-meta">
<a href="/" class="brand" rel="start">
<i class="logo-line"></i>
<h1 class="site-title">Junedayday Blog</h1>
<i class="logo-line"></i>
</a>
<p class="site-subtitle" itemprop="description">六月天天的个人博客</p>
</div>
<div class="site-nav-right">
<div class="toggle popup-trigger">
</div>
</div>
</div>
</div>
<div class="toggle sidebar-toggle">
<span class="toggle-line"></span>
<span class="toggle-line"></span>
<span class="toggle-line"></span>
</div>
<aside class="sidebar">
<div class="sidebar-inner sidebar-overview-active">
<ul class="sidebar-nav">
<li class="sidebar-nav-toc">
文章目录
</li>
<li class="sidebar-nav-overview">
站点概览
</li>
</ul>
<!--noindex-->
<section class="post-toc-wrap sidebar-panel">
</section>
<!--/noindex-->
<section class="site-overview-wrap sidebar-panel">
<div class="site-author animated" itemprop="author" itemscope itemtype="http://schema.org/Person">
<p class="site-author-name" itemprop="name">Junedayday</p>
<div class="site-description" itemprop="description">Blog信息</div>
</div>
<div class="site-state-wrap animated">
<nav class="site-state">
<div class="site-state-item site-state-posts">
<a href="/archives">
<span class="site-state-item-count">128</span>
<span class="site-state-item-name">日志</span>
</a>
</div>
<div class="site-state-item site-state-categories">
<a href="/categories/">
<span class="site-state-item-count">6</span>
<span class="site-state-item-name">分类</span></a>
</div>
<div class="site-state-item site-state-tags">
<a href="/tags/">
<span class="site-state-item-count">12</span>
<span class="site-state-item-name">标签</span></a>
</div>
</nav>
</div>
</section>
</div>
</aside>
<div class="sidebar-dimmer"></div>
</header>
<div class="back-to-top">
<i class="fa fa-arrow-up"></i>
<span>0%</span>
</div>
<noscript>
<div class="noscript-warning">Theme NexT works best with JavaScript enabled</div>
</noscript>
<div class="main-inner index posts-expand">
<article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-CN">
<link itemprop="mainEntityOfPage" href="http://example.com/2023/05/07/weekly/weekly-2023-19/">
<span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
<meta itemprop="image" content="/images/avatar.gif">
<meta itemprop="name" content="Junedayday">
<meta itemprop="description" content="Blog信息">
</span>
<span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
<meta itemprop="name" content="Junedayday Blog">
</span>
<header class="post-header">
<h2 class="post-title" itemprop="name headline">
<a href="/2023/05/07/weekly/weekly-2023-19/" class="post-title-link" itemprop="url">【每周小结】2023-Week19</a>
</h2>
<div class="post-meta-container">
<div class="post-meta">
<span class="post-meta-item">
<span class="post-meta-item-icon">
<i class="far fa-calendar"></i>
</span>
<span class="post-meta-item-text">发表于</span>
<time title="创建时间：2023-05-07 18:00:00" itemprop="dateCreated datePublished" datetime="2023-05-07T18:00:00+08:00">2023-05-07</time>
</span>
<span class="post-meta-item">
<span class="post-meta-item-icon">
<i class="far fa-calendar-check"></i>
</span>
<span class="post-meta-item-text">更新于</span>
<time title="修改时间：2023-05-09 14:12:29" itemprop="dateModified" datetime="2023-05-09T14:12:29+08:00">2023-05-09</time>
</span>
<span class="post-meta-item">
<span class="post-meta-item-icon">
<i class="far fa-folder"></i>
</span>
<span class="post-meta-item-text">分类于</span>
<span itemprop="about" itemscope itemtype="http://schema.org/Thing">
<a href="/categories/%E6%88%90%E9%95%BF%E5%88%86%E4%BA%AB/" itemprop="url" rel="index"><span itemprop="name">成长分享</span></a>
</span>
</span>
</div>
</div>
</header>
<div class="post-body" itemprop="articleBody">
<p><img src="https://cloud-fitter-1305666920.cos.ap-beijing.myqcloud.com/weekly.jpg"></p>
<!--noindex-->
<div class="post-button">
<a class="btn" href="/2023/05/07/weekly/weekly-2023-19/#more" rel="contents">
阅读全文 »
</a>
</div>
<!--/noindex-->
</div>
<footer class="post-footer">
<div class="post-eof"></div>
</footer>
</article>
<article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-CN">
<link itemprop="mainEntityOfPage" href="http://example.com/2023/04/23/weekly/weekly-2023-17/">
<span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
<meta itemprop="image" content="/images/avatar.gif">
<meta itemprop="name" content="Junedayday">
<meta itemprop="description" content="Blog信息">
</span>
<span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
<meta itemprop="name" content="Junedayday Blog">
</span>
<header class="post-header">
<h2 class="post-title" itemprop="name headline">
<a href="/2023/04/23/weekly/weekly-2023-17/" class="post-title-link" itemprop="url">【每周小结】2023-Week17</a>
</h2>
<div class="post-meta-container">
<div class="post-meta">
<span class="post-meta-item">
<span class="post-meta-item-icon">
<i class="far fa-calendar"></i>
</span>
<span class="post-meta-item-text">发表于</span>
<time title="创建时间：2023-04-23 18:00:00" itemprop="dateCreated datePublished" datetime="2023-04-23T18:00:00+08:00">2023-04-23</time>
</span>
<span class="post-meta-item">
<span class="post-meta-item-icon">
<i class="far fa-calendar-check"></i>
</span>
<span class="post-meta-item-text">更新于</span>
<time title="修改时间：2023-04-28 11:03:12" itemprop="dateModified" datetime="2023-04-28T11:03:12+08:00">2023-04-28</time>
</span>
<span class="post-meta-item">
<span class="post-meta-item-icon">
<i class="far fa-folder"></i>
</span>
<span class="post-meta-item-text">分类于</span>
<span itemprop="about" itemscope itemtype="http://schema.org/Thing">
<a href="/categories/%E6%88%90%E9%95%BF%E5%88%86%E4%BA%AB/" itemprop="url" rel="index"><span itemprop="name">成长分享</span></a>
</span>
</span>
</div>
</div>
</header>
<div class="post-body" itemprop="articleBody">
<p><img src="https://cloud-fitter-1305666920.cos.ap-beijing.myqcloud.com/weekly.jpg"></p>
<!--noindex-->
<div class="post-button">
<a class="btn" href="/2023/04/23/weekly/weekly-2023-17/#more" rel="contents">
阅读全文 »
</a>
</div>
<!--/noindex-->
</div>
<footer class="post-footer">
<div class="post-eof"></div>
</footer>
</article>
<article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-CN">
<link itemprop="mainEntityOfPage" href="http://example.com/2023/04/16/weekly/weekly-2023-16/">
<span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
<meta itemprop="image" content="/images/avatar.gif">
<meta itemprop="name" content="Junedayday">
<meta itemprop="description" content="Blog信息">
</span>
<span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
<meta itemprop="name" content="Junedayday Blog">
</span>
<header class="post-header">
<h2 class="post-title" itemprop="name headline">
<a href="/2023/04/16/weekly/weekly-2023-16/" class="post-title-link" itemprop="url">【每周小结】2023-Week16</a>
</h2>
<div class="post-meta-container">
<div class="post-meta">
<span class="post-meta-item">
<span class="post-meta-item-icon">
<i class="far fa-calendar"></i>
</span>
<span class="post-meta-item-text">发表于</span>
<time title="创建时间：2023-04-16 18:00:00" itemprop="dateCreated datePublished" datetime="2023-04-16T18:00:00+08:00">2023-04-16</time>
</span>
<span class="post-meta-item">
<span class="post-meta-item-icon">
<i class="far fa-calendar-check"></i>
</span>
<span class="post-meta-item-text">更新于</span>
<time title="修改时间：2023-04-21 17:04:07" itemprop="dateModified" datetime="2023-04-21T17:04:07+08:00">2023-04-21</time>
</span>
<span class="post-meta-item">
<span class="post-meta-item-icon">
<i class="far fa-folder"></i>
</span>
<span class="post-meta-item-text">分类于</span>
<span itemprop="about" itemscope itemtype="http://schema.org/Thing">
<a href="/categories/%E6%88%90%E9%95%BF%E5%88%86%E4%BA%AB/" itemprop="url" rel="index"><span itemprop="name">成长分享</span></a>
</span>
</span>
</div>
</div>
</header>
<div class="post-body" itemprop="articleBody">
<p><img src="https://cloud-fitter-1305666920.cos.ap-beijing.myqcloud.com/weekly.jpg"></p>
<!--noindex-->
<div class="post-button">
<a class="btn" href="/2023/04/16/weekly/weekly-2023-16/#more" rel="contents">
阅读全文 »
</a>
</div>
<!--/noindex-->
</div>
<footer class="post-footer">
<div class="post-eof"></div>
</footer>
</article>
<article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-CN">
<link itemprop="mainEntityOfPage" href="http://example.com/2023/04/15/sharing-5min/2023/20230415/">
<span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
<meta itemprop="image" content="/images/avatar.gif">
<meta itemprop="name" content="Junedayday">
<meta itemprop="description" content="Blog信息">
</span>
<span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
<meta itemprop="name" content="Junedayday Blog">
</span>
<header class="post-header">
<h2 class="post-title" itemprop="name headline">
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<p>近几年，程序的可观测的理论非常火，但很多同学对其三个概念一知半解。</p>
<p><code>Logging</code>对应到日志，<code>Metrics</code>对应到监控指标，而<code>Tracing</code>的概念最为复杂。推荐大家可以看看这篇<a target="_blank" rel="noopener" href="https://mp.weixin.qq.com/s/00aiWY5bX6RnAKL8UpAZyw">文章</a>作为入门。</p>
<p>最核心概念为2个：</p>
<ul>
<li><code>Trace</code> 一次请求的唯一标记。一般在入口处生成，串联了各程序、中间件之间的调用。常说的<code>traceid</code>是一次<code>Trace</code>的唯一标记</li>
<li><code>Span</code> 指具体的一个调用。如服务A调用了服务B、或服务A查询了MySQL，是不同的<code>Span</code>。<code>Span</code>有很多有意义的指标，如调用方法名、耗时、调用结果、父子关系，也可以添加自定义的标签<code>tag</code></li>
</ul>
<p>基于<code>Trace</code>与<code>Span</code>有很多玩法，但始终绕不开以下3点：</p>
<ol>
<li><strong>单个请求的视角</strong>：基于<code>Trace</code>的问题排查</li>
<li><strong>单功能模的视角</strong>：基于<code>Span</code>的QPS/失败率的统计</li>
<li><strong>系统视角</strong>：基于<code>Trace</code>和<code>Span</code>的治理</li>
</ol>
<p>前两点与开发同学的日常工作息息相关，而第三点则是基础架构组关注的重点，有许多衍生出来的玩法，如压测、容量规划等。</p>
<p>从社区来说，目前已基本由<a target="_blank" rel="noopener" href="https://opentelemetry.io/">OpenTelemetry</a>实现标准的大一统，有兴趣的同学可以适当关注。</p>
<blockquote>
<p>Github: <a target="_blank" rel="noopener" href="https://github.com/Junedayday/code_reading">https://github.com/Junedayday/code_reading</a></p>
<p>Blog: <a target="_blank" rel="noopener" href="http://junes.tech/">http://junes.tech/</a></p>
<p>Bilibili: <a target="_blank" rel="noopener" href="https://space.bilibili.com/293775192">https://space.bilibili.com/293775192</a></p>
<p>公众号: golangcoding</p>
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<p>在2023-03-24，<code>Github</code>官方对自己的<code>RSA SSH host key</code>进行了更新。最直接的现象是用户与远端仓库连接时会报错：</p>
<figure class="highlight shell"><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">@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@</span><br><span class="line">@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @</span><br><span class="line">@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@</span><br><span class="line">IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!</span><br><span class="line">Someone could be eavesdropping on you right now (man-in-the-middle attack)!</span><br><span class="line">It is also possible that a host key has just been changed.</span><br><span class="line">The fingerprint for the RSA key sent by the remote host is</span><br><span class="line">SHA256:uNiVztksCsDhcc0u9e8BujQXVUpKZIDTMczCvj3tD2s.</span><br><span class="line">Please contact your system administrator.</span><br><span class="line">Add correct host key in ~/.ssh/known_hosts to get rid of this message.</span><br><span class="line">Host key for github.com has changed and you have requested strict checking.</span><br><span class="line">Host key verification failed.</span><br></pre></td></tr></table></figure>
<p>官方的<a target="_blank" rel="noopener" href="https://github.blog/2023-03-23-we-updated-our-rsa-ssh-host-key/">博客</a>给出了解决方案，主要分为两步、各有一个自动方案和手动方案：</p>
<ol>
<li>删除原key<ol>
<li>自动方案：执行命令<code>ssh-keygen -R github.com</code></li>
<li>手动方案：手动去文件<code>~/.ssh/known_hosts</code>里删除<code>github.com</code>的那行数据</li>
</ol>
</li>
<li>更新key<ol>
<li>自动方案：执行命令 <code>curl -L https://api.github.com/meta | jq -r '.ssh_keys | .[]' | sed -e 's/^/github.com /' >> ~/.ssh/known_hosts</code></li>
<li>手动方案：手动去文件<code>~/.ssh/known_hosts</code>插入数据，如下</li>
</ol>
</li>
</ol>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">github.com ssh-rsa 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</span><br></pre></td></tr></table></figure>
<p>关于这个更新，Github官方的描述很模糊 - <code>out of an abundance of caution</code> ，翻译过来就是 出于谨慎的考虑。</p>
<p>而对应的公告发布时间也是在更新前一天，很仓促，并且前后并不兼容、对用户的体验很差，让我不得不怀疑是官方遇到了相关安全漏洞的问题才做的紧急更新。</p>
<blockquote>
<p>Github: <a target="_blank" rel="noopener" href="https://github.com/Junedayday/code_reading">https://github.com/Junedayday/code_reading</a></p>
<p>Blog: <a target="_blank" rel="noopener" href="http://junes.tech/">http://junes.tech/</a></p>
<p>Bilibili: <a target="_blank" rel="noopener" href="https://space.bilibili.com/293775192">https://space.bilibili.com/293775192</a></p>
<p>公众号: golangcoding</p>
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