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<!-- build time:Wed Mar 09 2022 10:17:49 GMT+0800 (GMT+08:00) --><!doctype html><html class="theme-next mist" lang="zh-Hans"><head><meta name="generator" content="Hexo 3.8.0"><meta name="google-site-verification" content="7Tau9WyVgxnsEY9oYedu9g0U6_8akOX3wiKbaYcrg9A"><meta name="baidu-site-verification" content="EVwLiaxdxX"><link href="/css/xps13.css" rel="stylesheet" type="text/css"><link href="/css/message.css" rel="stylesheet" type="text/css"><link href="//fonts.googleapis.com/css?family=Baloo+Bhaijaan|Inconsolata|Josefin+Sans|Montserrat" rel="stylesheet"><script type="text/javascript" src="/js/jquery-1.11.3.min.js"></script><meta charset="UTF-8"><meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1"><meta http-equiv="Cache-Control" content="no-transform"><meta http-equiv="Cache-Control" content="no-siteapp"><link href="/lib/font-awesome/css/font-awesome.min.css?v=4.6.2" rel="stylesheet" type="text/css"><link href="/css/main.css?v=5.1.1" rel="stylesheet" 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class="content"><div id="posts" class="posts-expand"><article class="post post-type-normal" itemscope itemtype="http://schema.org/Article"><link itemprop="mainEntityOfPage" href="http://mrbird.cc/Docker-network.html"><span hidden itemprop="author" itemscope itemtype="http://schema.org/Person"><meta itemprop="name" content="MrBird"><meta itemprop="description" content=""><meta itemprop="image" content="/images/blogImage.jpg"></span><span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="MrBird"></span><header class="post-header"><h2 class="post-title" itemprop="name headline">Docker网络配置</h2><div class="post-meta"><span class="post-time"><span class="post-meta-item-icon"><i class="fa fa-calendar-o"></i> </span><span class="post-meta-item-text"></span> <time title="创建于" itemprop="dateCreated datePublished" datetime="2018-10-19T15:27:12+08:00">2018-10-19 </time></span><span></span> <span class="post-meta-divider">|</span> <span class="page-pv"><i class="fa fa-laptop"></i> Visit count <span class="busuanzi-value" id="busuanzi_value_page_pv"></span></span></div></header><div class="post-body" itemprop="articleBody"><p>在安装好Docker后，其默认提供了三种网络模式：bridge、host和none。其中bridge是Docker默认的网络模式，在该模式下，容器拥有自己的IP namespace，容器可以通过宿主机上的docker0网桥与别的容器、宿主机或者外部网络进行通信。此外我们还可以通过端口映射的方式让外部环境也能访问到容器内部。</p><p>Docker默认的网络模式如下图所示：</p><a id="more"></a><p><img src="img/asdfasdfasdfasdf.png" style="width:35rem"></p><h2 id="bridge网络模式"><a href="#bridge网络模式" class="headerlink" title="bridge网络模式"></a>bridge网络模式</h2><p>Docker三种网络模式：</p><p><img src="img/QQ截图20190405212723.png" alt="QQ截图20190405212723.png"></p><p>下面我们通过busybox来进行演示。</p><div class="note info"><p>BusyBox 是一个集成了一百多个最常用 Linux 命令和工具（如 cat、echo、grep、mount、telnet 、ping、ifconfig 等）的精简工具箱，它只需要几 MB 的大小，很方便进行各种快速验证，被誉为“Linux 系统的瑞士军刀”。</p></div><p>下载busybox镜像:</p><p><img src="img/QQ截图20190405213450.png" alt="QQ截图20190405213450.png"></p><p>通过该镜像创建两个容器test1和test2：</p><p><img src="img/QQ截图20190405214111.png" alt="QQ截图20190405214111.png"></p><p>使用<code>docker network inspect bridge</code>命令查看bridge网络详情：</p><p><img src="img/QQ截图20190405214758.png" alt="QQ截图20190405214758.png"></p><p>可以看到test1和test2都连接到了bridge（因为是Docker默认的网络模式），并且test1内部IP为172.17.0.2，test2内部IP为172.17.0.3。</p><p>我们看下在test1容器内部是否可以ping通test2的IP：</p><p><img src="img/QQ截图20190405215123.png" alt="QQ截图20190405215123.png"></p><p>可以看到是没问题的。</p><p>看下test1内部ping宿主机IP（192.168.33.10）和外部网络是否可行：</p><p><img src="img/QQ截图20190405215412.png" alt="QQ截图20190405215412.png"></p><h2 id="link"><a href="#link" class="headerlink" title="link"></a>link</h2><p>我们可以在创建容器的使用使用<code>--link</code>来让容器间的网络建立映射关系。</p><p>我们删除test2容器，重新创建test2容器，并且让其和test1建立网络映射关系：</p><p><img src="img/QQ截图20190405215912.png" alt="QQ截图20190405215912.png"></p><p>这样我们就可以在test2容器内部使用<code>ping test1</code>ping通test1网络了：</p><p><img src="img/QQ截图20190405220104.png" alt="QQ截图20190405220104.png"></p><h2 id="创建自定义网桥"><a href="#创建自定义网桥" class="headerlink" title="创建自定义网桥"></a>创建自定义网桥</h2><p>我们可以通过<code>docker network create</code>来创建自定义的网桥，比如我们创建一个新的网桥，名称为my-bridge：</p><p><img src="img/QQ截图20190405220452.png" alt="QQ截图20190405220452.png"></p><p>模式选择的是bridge。</p><p>我们让test1和test2容器都连接到这个新的网桥上（也可以在创建容器的时候使用<code>--network</code>来指定需要连接的网桥）：</p><p><img src="img/QQ截图20190405220613.png" alt="QQ截图20190405220613.png"></p><p>查看my-bridge详情：</p><p><img src="img/QQ截图20190405220708.png" alt="QQ截图20190405220708.png"></p><p>可以看到test1和test2都连接上来了。</p><p>使用自定义网桥有个明显的好处是，容器间可以通过容器名称进行网络通信（无需在创建容器的时候使用<code>--link</code>来指定）。我们在创建test1容器的时候并没有使用<code>--link test2</code>来连接test2，我们看看在连接到my-bridge后，test1内部是否可以通过<code>ping test2</code>ping通test2 IP：</p><p><img src="img/QQ截图20190405221050.png" alt="QQ截图20190405221050.png"></p><p>可以看到是没问题的。</p><h2 id="端口映射"><a href="#端口映射" class="headerlink" title="端口映射"></a>端口映射</h2><p>在宿主机上我们是无法访问Docker容器内部网络的，不过我们可以通过端口映射的方式来实现这个需求。</p><p>以MySQL为例子，我们拉取MySQL镜像：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">docker pull mysql:5.7.25</span><br></pre></td></tr></table></figure><p></p><p>在创建MySQL容器的时候可以使用<code>-p</code>或<code>-P</code>让容器暴露的端口和宿主机的端口进行映射：</p><p><img src="img/QQ截图20190405222046.png" alt="QQ截图20190405222046.png"></p><p><code>-e</code>指定环境变量。</p><p><code>-p 3306:3306</code>（冒号前面的端口为宿主机端口，后面的端口为容器端口）的意思是，让容器暴露的3306端口映射到宿主机的3306端口，这样我们就可以在宿主机外部通过192.168.33.10:3306来连接MySQL容器了：</p><p><img src="img/QQ截图20190405222358.png" alt="QQ截图20190405222358.png"></p><p>Docker的host和none网络模式使用较少这里就不介绍了。</p><p>参考🔗：<a href="https://docs.docker.com/v17.09/engine/userguide/networking/#set-the-environment-variables-manually" target="_blank" rel="noopener">https://docs.docker.com/v17.09/engine/userguide/networking/#set-the-environment-variables-manually</a></p><script>$(".post-body 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