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<article id="post-从进程到协程" class="article article-type-post" itemscope itemprop="blogPost">
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<a href="/2018/07/27/从进程到协程/" class="article-date">
<time datetime="2018-07-27T09:25:46.000Z" itemprop="datePublished">2018-07-27</time>
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<a class="article-category-link" href="/categories/技术/">技术</a>►<a class="article-category-link" href="/categories/技术/编程/">编程</a>
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<a class="article-title" href="/2018/07/27/从进程到协程/">从进程到协程</a>
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<h2 id="进程"><a href="#进程" class="headerlink" title="进程"></a>进程</h2><p>早期的计算机执行程序，是顺序执行的。按顺序一次做一件事情，只有当前的程序执行完了，才能执行下一个程序。</p>
<p>这样做有什么问题呢？</p>
<ol>
<li><p>程序只能按顺序执行，如果当前的程序计算量比较大，运行时间比较长，后序的程序就长时间得不到运行。系统会表现的像死机一样。</p>
</li>
<li><p>属于同一个程序的计算和IO直接也是顺序执行的。在程序进行IO的时候，CPU只能等待。资源利用率很低。</p>
</li>
</ol>
<p>为此，在系统中引入多道程序技术，使得程序直接可以并发执行。</p>
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<article id="post-Java中各种锁的概念" class="article article-type-post" itemscope itemprop="blogPost">
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<a href="/2018/07/22/Java中各种锁的概念/" class="article-date">
<time datetime="2018-07-22T09:14:58.000Z" itemprop="datePublished">2018-07-22</time>
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<a class="article-title" href="/2018/07/22/Java中各种锁的概念/">Synchronized的锁机制</a>
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<p>这段时间了解了一下Java中的Synchronized和J.U.C，从中整理出一些关于<code>锁</code>的概念。</p>
<p>关于Synchronized的用法，在之前的<a href="http://yukai.space/2016/08/16/synchronized%E7%9A%84%E4%B8%80%E4%BA%9B%E7%94%A8%E6%B3%95/">这篇博客</a>中也学习到了，现在来看看Synchronized在JVM中的实现。</p>
<h2 id="Java对象在JVM中的结构"><a href="#Java对象在JVM中的结构" class="headerlink" title="Java对象在JVM中的结构"></a>Java对象在JVM中的结构</h2><p>在Hotspot虚拟机当中，对象在内存中的存储布局可以分为3块区域：对象头、实例数据、对齐填充。</p>
<img src="/2018/07/22/Java中各种锁的概念/object.png" alt="java对象" title="java对象">
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<article id="post-JUC概述" class="article article-type-post" itemscope itemprop="blogPost">
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<a href="/2018/07/13/JUC概述/" class="article-date">
<time datetime="2018-07-13T14:20:40.000Z" itemprop="datePublished">2018-07-13</time>
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<a class="article-category-link" href="/categories/技术/">技术</a>►<a class="article-category-link" href="/categories/技术/编程/">编程</a>
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<a class="article-title" href="/2018/07/13/JUC概述/">JUC概述</a>
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<h1 id="JUC概述"><a href="#JUC概述" class="headerlink" title="JUC概述"></a>JUC概述</h1><p>java.util.concurrent的缩写，该包参考自EDU.oswego.cs.dl.util.concurrent，是JSR 166标准规范的一个实现；</p>
<p>JSR 166，是一个关于Java并发编程的规范提案，在JDK中，该规范由java.util.concurrent包实现。</p>
<p>即，JUC是Java提供的并发包，其中包含了一些并发编程用到的基础组件。</p>
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<article id="post-gitlab备份恢复方案" class="article article-type-post" itemscope itemprop="blogPost">
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<a href="/2018/06/17/gitlab备份恢复方案/" class="article-date">
<time datetime="2018-06-16T22:34:35.000Z" itemprop="datePublished">2018-06-17</time>
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<a class="article-category-link" href="/categories/技术/">技术</a>►<a class="article-category-link" href="/categories/技术/工具/">工具</a>
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<a class="article-title" href="/2018/06/17/gitlab备份恢复方案/">gitlab备份恢复方案</a>
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<p>最近公司内部的gitlab私服打算上线了，其中，数据备份是很重要的一课。</p>
<p>研究制定了一下备份恢复的方案～记录一下</p>
<h2 id="备份策略"><a href="#备份策略" class="headerlink" title="备份策略"></a>备份策略</h2><img src="/2018/06/17/gitlab备份恢复方案/structure.png" alt="备份" title="备份">
<p>有 machine-A、machine-B、machine-C 三台实体机，统一为windows系统；</p>
<p>vm-A、vm-B、vm-C、vm-D、vm-E 为Linux系统虚拟机，其中:</p>
<p>vm-A 提供 gitlab 服务，vm-B 提供 redmine 服务；</p>
<p>vm-C 为远程备份服务器；</p>
<p>vm-D 是 vm-B 的备份镜像，vm-E 是vm-A的备份镜像。</p>
<p>vm-D 和 vm-E 平时处于关闭状态，只有在 vm-A 或 vm-B 不可用，或者做备份恢复测试时再进行启用。</p>
<p>注：虚拟机管理工具统一使用 VirtualBox</p>
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<article id="post-SSH端口转发" class="article article-type-post" itemscope itemprop="blogPost">
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<time datetime="2018-06-01T15:00:17.000Z" itemprop="datePublished">2018-06-01</time>
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<a class="article-category-link" href="/categories/技术/">技术</a>►<a class="article-category-link" href="/categories/技术/Linux/">Linux</a>
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<a class="article-title" href="/2018/06/01/SSH端口转发/">SSH端口转发</a>
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<h2 id="端口转发"><a href="#端口转发" class="headerlink" title="端口转发"></a>端口转发</h2><p>在之前的总结中提到过端口映射即端口转发：<a href="http://yukai.space/2017/06/05/%E5%A6%82%E4%BD%95%E4%BB%8E%E5%A4%96%E7%BD%91%E8%AE%BF%E9%97%AE%E5%AE%B6%E9%87%8C%E7%9A%84%E7%94%B5%E8%84%91/">如何从外网访问家里的电脑</a>。即将数据从一台机器的某个端口转发到另一台机器的某个端口。</p>
<img src="/2018/06/01/SSH端口转发/port.png" alt="端口转发" title="端口转发">
<p>A 的数据通过 B 转发 到 C，C 的响应再从 B 转发到 A</p>
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<article id="post-VirtualBox共享文件夹" class="article article-type-post" itemscope itemprop="blogPost">
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<a href="/2018/05/02/VirtualBox共享文件夹/" class="article-date">
<time datetime="2018-05-02T12:50:30.000Z" itemprop="datePublished">2018-05-02</time>
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<a class="article-category-link" href="/categories/技术/">技术</a>►<a class="article-category-link" href="/categories/技术/Linux/">Linux</a>
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<a class="article-title" href="/2018/05/02/VirtualBox共享文件夹/">VirtualBox设置共享文件夹</a>
</h1>
</header>
<div class="article-entry" itemprop="articleBody">
<blockquote>
<p>最近在做 Gitlab 备份，Gitlab本身运行在虚拟机当中，备份策略是使用 Rsync 备份到远程主机一份；同时在宿主机备份一份。宿主机使用了windows，想到了一个较为简单的办法，即设置共享文件夹，将需要备份的内容定时复制到共享文件夹即可。在设置共享文件夹的过程中遇到一些问题，在此记录下来。</p>
</blockquote>
<p>因为虚拟机所在的 IP 无法访问外网，只能访问公司内部网络。所以在进行下面的操作之前，需要配置一下 yum 的代理：</p>
<p>我在本机开启了 shadowsocks 服务，ip：192.168.1.70，port：1090</p>
<p>虚拟机内执行：</p>
<p><code>sudo vim /etc/yum.conf</code></p>
<p>增加下面内容：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">proxy=socks5h://192.168.1.70:1090</div></pre></td></tr></table></figure>
<p>保存，退出。yum代理设置成功。</p>
<h2 id="虚拟机安装增强功能"><a href="#虚拟机安装增强功能" class="headerlink" title="虚拟机安装增强功能"></a>虚拟机安装增强功能</h2><ul>
<li><p>安装 linux-headers</p>
<p> 有两种解决办法：</p>
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<article id="post-Centos7美化" class="article article-type-post" itemscope itemprop="blogPost">
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<a href="/2018/05/01/Centos7美化/" class="article-date">
<time datetime="2018-05-01T09:43:23.000Z" itemprop="datePublished">2018-05-01</time>
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<a class="article-category-link" href="/categories/技术/">技术</a>►<a class="article-category-link" href="/categories/技术/Linux/">Linux</a>
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<a class="article-title" href="/2018/05/01/Centos7美化/">Centos7美化</a>
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<p>五一假期比较闲，把我自己PC上的Centos7美化了一下，能够让自己看着舒服点。</p>
<p>先上一张效果图：</p>
<img src="/2018/05/01/Centos7美化/1.png" alt="桌面" title="桌面">
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<article id="post-联通华为HG8347R设置桥接模式" class="article article-type-post" itemscope itemprop="blogPost">
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<p><a href="http://yukai.space/2017/06/05/%E5%A6%82%E4%BD%95%E4%BB%8E%E5%A4%96%E7%BD%91%E8%AE%BF%E9%97%AE%E5%AE%B6%E9%87%8C%E7%9A%84%E7%94%B5%E8%84%91/">前面的笔记</a>中有提到如何通过外网访问家里的服务。在某些场景下可能会用到，比如想要在单位ssh家里的电脑，或者访问家里的NAS等设备等等。之前用的电信的宽带，是通过自己的路由器拨号上网，并且外网IP也是直接分配好的，配一下DDNS和端口映射即可。前一段时间换了联通的宽带。</p>
<p>更换宽带的时候，联通提供了一个光猫，华为HG8347R。这个光猫取代了之前的路由器，拨号也由他进行。通过该光猫的无线功能就可以直接连接WIFI上网了。但是这个光猫的无线性能较差，于是在 Lan1 口接了一个自己的TP-link路由器，通过该路由器提供的wifi信号可以正常上网。此时出现了两个WIFI信号，一个是光猫提供的，一个是TP-link路由器提供的。家里的终端设备都使用TP-link提供的WIFI上网。此时的网络拓扑大致如下：</p>
<img src="/2018/04/30/联通华为HG8347R设置桥接模式/route.png" alt="拓扑" title="拓扑">
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