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<span class="hx:min-w-0 [word-break:break-word]">docker简单笔记</span>
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>前言</a>
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<a
href="#%e5%ae%89%e8%a3%85docker%e5%92%8cdocker-compose"
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>安装docker和docker compose</a>
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<a
href="#docker-%e5%9f%ba%e6%9c%ac%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95"
class="hx:flex hx:rounded-sm hx:px-2 hx:py-1.5 hx:text-sm hx:transition-colors [word-break:break-word] hx:cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] hx:contrast-more:border hx:gap-2 hx:before:opacity-25 hx:before:content-['#'] hx:text-gray-500 hx:hover:bg-gray-100 hx:hover:text-gray-900 hx:dark:text-neutral-400 hx:dark:hover:bg-primary-100/5 hx:dark:hover:text-gray-50 hx:contrast-more:text-gray-900 hx:contrast-more:dark:text-gray-50 hx:contrast-more:border-transparent hx:contrast-more:hover:border-gray-900 hx:contrast-more:dark:hover:border-gray-50"
>docker 基本使用方法</a>
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href="#%e6%9b%b4%e6%8d%a2docker%e9%95%9c%e5%83%8f%e6%ba%90"
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>更换docker镜像源</a>
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>docker-compose</a>
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href="/posts/231127-vncserver/"
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<span class="hx:min-w-0 [word-break:break-word]">Linux安装VNC服务端</span>
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href="/posts/230908-py-post/"
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<h1 class="hx:mb-0 hx:text-4xl hx:font-bold hx:tracking-tight hx:text-slate-900 hx:dark:text-slate-100">docker简单笔记</h1>
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<p>学习docker,使用docker,编写docker</p>
<h2>前言<span class="hx:absolute hx:-mt-20" id="前言"></span>
<a href="#%e5%89%8d%e8%a8%80" class="subheading-anchor" aria-label="此章节的永久链接"></a></h2><p>祝自己圣诞节快乐,去年的愿望是“明年不要一个人过圣诞”,今年的愿望也是“明年不要一个人过圣诞”。</p>
<p>不扯了,docker,又称容器,是一种高效的虚拟化技术,能够在不启动虚拟机的情况下,创建一套虚拟环境,方便调试程序,配置环境,乃至直接抄别人的配置。docker还有一个进阶的docker compose,支持多个容器之间组合互联组成一套完整环境。</p>
<p>由于docker比较复杂,又没有官方支持的gui界面~~(在官网看好像有了?但是就当他没有吧。)~~;中文环境的文档、教程都冗长复杂不想看,因此docker一直是我学习路上的一个绕路点。今天打算突破它,记录最简单的docker指令和方法。</p>
<h2>安装docker和docker compose<span class="hx:absolute hx:-mt-20" id="安装docker和docker-compose"></span>
<a href="#%e5%ae%89%e8%a3%85docker%e5%92%8cdocker-compose" class="subheading-anchor" aria-label="此章节的永久链接"></a></h2><p>虽然阿里ECS之类的云主机大多预装了docker,但是海外主机、自己装的linux系统大多还是没有docker的,我们从安装开始。以ubuntu为例。</p>
<p>apt仓库提供的docker-io等软件包是社区构建的非官方版本,要安装官方版,需要多几个步骤。</p>
<div class="hextra-code-block hx:relative hx:mt-6 hx:first:mt-0 hx:group/code">
<div><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span><span style="color:#75715e"># 添加docker官方的gpg</span>
</span></span><span style="display:flex;"><span>curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span><span style="color:#75715e"># 在/etc/apt/source.list.d 里面添加docker的源地址,借用官网的一行指令直接添加</span>
</span></span><span style="display:flex;"><span>echo <span style="color:#e6db74">&#34;deb [arch=</span><span style="color:#66d9ef">$(</span>dpkg --print-architecture<span style="color:#66d9ef">)</span><span style="color:#e6db74"> signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu </span><span style="color:#66d9ef">$(</span>. /etc/os-release <span style="color:#f92672">&amp;&amp;</span> echo <span style="color:#e6db74">&#34;</span>$VERSION_CODENAME<span style="color:#e6db74">&#34;</span><span style="color:#66d9ef">)</span><span style="color:#e6db74"> stable&#34;</span> | sudo tee /etc/apt/sources.list.d/docker.list &gt; /dev/null
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span><span style="color:#75715e"># 我这边添加的结果是</span>
</span></span><span style="display:flex;"><span>deb <span style="color:#f92672">[</span>arch<span style="color:#f92672">=</span>amd64 signed-by<span style="color:#f92672">=</span>/usr/share/keyrings/docker-archive-keyring.gpg<span style="color:#f92672">]</span> https://download.docker.com/linux/ubuntu jammy stable</span></span></code></pre></div></div><div class="hextra-code-copy-btn-container hx:opacity-0 hx:transition hx:group-hover/code:opacity-100 hx:flex hx:gap-1 hx:absolute hx:m-[11px] hx:right-0 hx:top-0">
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<p>然后可以通过apt源安装docker了</p>
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<div><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span>sudo apt update
</span></span><span style="display:flex;"><span>sudo apt install docker-ce docker-ce-cli containerd.io docker-compose-plugin</span></span></code></pre></div></div><div class="hextra-code-copy-btn-container hx:opacity-0 hx:transition hx:group-hover/code:opacity-100 hx:flex hx:gap-1 hx:absolute hx:m-[11px] hx:right-0 hx:top-0">
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<p>*<em>注意,上面的指令同时安装了docker-compose</em>。如果不安装docker,直接安装docker-compose也是可以的。</p>
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<div><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span>wget https://github.com/docker/compose/releases/download/v2.5.0/docker-compose-linux-x86_64
</span></span><span style="display:flex;"><span>sudo cp ./docker-compose-linux-x86_64 /usr/bin/docker-compose</span></span></code></pre></div></div><div class="hextra-code-copy-btn-container hx:opacity-0 hx:transition hx:group-hover/code:opacity-100 hx:flex hx:gap-1 hx:absolute hx:m-[11px] hx:right-0 hx:top-0">
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</div>
</div>
<p>更加具体的步骤和细节可以到官网查看:<a href="https://docs.docker.com/engine/install/ubuntu/"target="_blank" rel="noopener">docker安装</a><a href="https://docs.docker.com/compose/install/standalone/"target="_blank" rel="noopener">docker-compose安装</a></p>
<h2>docker 基本使用方法<span class="hx:absolute hx:-mt-20" id="docker-基本使用方法"></span>
<a href="#docker-%e5%9f%ba%e6%9c%ac%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95" class="subheading-anchor" aria-label="此章节的永久链接"></a></h2><p>使用一个docker镜像的步骤是【拉取镜像、创建容器、运行容器、停止容器】,一般创建和运行通过同一条指令实现。</p>
<div class="hextra-code-block hx:relative hx:mt-6 hx:first:mt-0 hx:group/code">
<div><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span><span style="color:#75715e"># 拉取一个镜像</span>
</span></span><span style="display:flex;"><span>docker pull xxx/yyy
</span></span><span style="display:flex;"><span><span style="color:#75715e"># 创建容器并运行</span>
</span></span><span style="display:flex;"><span>docker run --name aaa xxx/yyy
</span></span><span style="display:flex;"><span><span style="color:#75715e"># 停止容器</span>
</span></span><span style="display:flex;"><span>docker stop docker-id</span></span></code></pre></div></div><div class="hextra-code-copy-btn-container hx:opacity-0 hx:transition hx:group-hover/code:opacity-100 hx:flex hx:gap-1 hx:absolute hx:m-[11px] hx:right-0 hx:top-0">
<button
class="hextra-code-copy-btn hx:group/copybtn hx:cursor-pointer hx:transition-all hx:active:opacity-50 hx:bg-primary-700/5 hx:border hx:border-black/5 hx:text-gray-600 hx:hover:text-gray-900 hx:rounded-md hx:p-1.5 hx:dark:bg-primary-300/10 hx:dark:border-white/10 hx:dark:text-gray-400 hx:dark:hover:text-gray-50"
title="复制代码"
aria-label="复制代码"
data-copied-label="已复制!"
>
<div class="hextra-copy-icon hx:group-[.copied]/copybtn:hidden hx:pointer-events-none hx:h-4 hx:w-4"></div>
<div class="hextra-success-icon hx:hidden hx:group-[.copied]/copybtn:block hx:pointer-events-none hx:h-4 hx:w-4"></div>
</button>
</div>
</div>
<p>关于运行容器,有很多常用的参数:</p>
<blockquote>
<p>-d 容器转入后台运行</p>
<p>-e 设置容器的环境变量</p>
<p>&ndash;name 容器名称</p>
<p>-p 80:80 将暴露的端口映射到容器内端口,外部:内部</p>
<p>-v f:c 将一个文件(卷)映射到容器内部的文件,支持文件和文件夹。外:内</p>
<p>-e、-p、-v 参数都可以多次使用,达到添加多个变量的目的。</p>
</blockquote>
<p>停止容器支持多种类型的参数,包括容器ID和容器名称。容器ID可以只写出部分,能够区分容器即可。</p>
<p>查询容器id,可以使用指令<code>docker ps</code>。docker还有其他几个查询和控制指令</p>
<blockquote>
<p><code>docker exec 容器 指令</code> 允许在外部执行docker内的指令,添加 -d 参数转入后台运行。</p>
<p><code>docker ps</code> 列出正在运行的docker容器信息。添加 -a 参数查看所有容器,包括已经停止的。</p>
<p><code>docker images</code> 列出已经下载的镜像列表。与 <code>docker image</code> 指令不同。</p>
<p><code>docker kill 容器名/id</code> 杀死一个无法stop的容器</p>
<p><code>docker rm 容器</code> 删除一个<strong>容器</strong></p>
<p><code>docker rmi 镜像名</code> 删除一个<strong>镜像</strong></p>
<p><code>docker restart 容器ID</code> 重启一个容器,毕竟我们不需要每次都创建新容器。</p>
</blockquote>
<p>关于docker运行时需要哪些端口,可以通过镜像的docker hub页面进行判断。</p>
<h2>更换docker镜像源<span class="hx:absolute hx:-mt-20" id="更换docker镜像源"></span>
<a href="#%e6%9b%b4%e6%8d%a2docker%e9%95%9c%e5%83%8f%e6%ba%90" class="subheading-anchor" aria-label="此章节的永久链接"></a></h2><p>和apt源、github一样,docker镜像源服务器在国外,国内访问可能很慢,遇到这个情况可以更换成国内的镜像源。</p>
<p>修改<code>/etc/docker/daemon.json</code>文件,添加下面的内容:</p>
<div class="hextra-code-block hx:relative hx:mt-6 hx:first:mt-0 hx:group/code">
<div><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-json" data-lang="json"><span style="display:flex;"><span>{
</span></span><span style="display:flex;"><span> <span style="color:#f92672">&#34;registry-mirrors&#34;</span>: [
</span></span><span style="display:flex;"><span> <span style="color:#e6db74">&#34;https://docker.mirrors.ustc.edu.cn&#34;</span>
</span></span><span style="display:flex;"><span> ]
</span></span><span style="display:flex;"><span>}</span></span></code></pre></div></div><div class="hextra-code-copy-btn-container hx:opacity-0 hx:transition hx:group-hover/code:opacity-100 hx:flex hx:gap-1 hx:absolute hx:m-[11px] hx:right-0 hx:top-0">
<button
class="hextra-code-copy-btn hx:group/copybtn hx:cursor-pointer hx:transition-all hx:active:opacity-50 hx:bg-primary-700/5 hx:border hx:border-black/5 hx:text-gray-600 hx:hover:text-gray-900 hx:rounded-md hx:p-1.5 hx:dark:bg-primary-300/10 hx:dark:border-white/10 hx:dark:text-gray-400 hx:dark:hover:text-gray-50"
title="复制代码"
aria-label="复制代码"
data-copied-label="已复制!"
>
<div class="hextra-copy-icon hx:group-[.copied]/copybtn:hidden hx:pointer-events-none hx:h-4 hx:w-4"></div>
<div class="hextra-success-icon hx:hidden hx:group-[.copied]/copybtn:block hx:pointer-events-none hx:h-4 hx:w-4"></div>
</button>
</div>
</div>
<p>编辑完成后需要重启docker服务。</p>
<p>具体的源地址可以进行搜索和尝试,我访问速度还行就没有更换。</p>
<h2>docker-compose<span class="hx:absolute hx:-mt-20" id="docker-compose"></span>
<a href="#docker-compose" class="subheading-anchor" aria-label="此章节的永久链接"></a></h2><p>docker compose是通过ymal配置文件来启动容器的,它支持将多个容器组合启动,并自动处理依赖关系。在docker compose中我们不需要拉取镜像,直接在配置文件中指定镜像名,在启动后会自动拉取。</p>
<p>首先创建一个工作目录,并创建一个<code>docker-compose.yml</code>的文件,默认情况下docker compose指令只认这个文件名。</p>
<div class="hextra-code-block hx:relative hx:mt-6 hx:first:mt-0 hx:group/code">
<div><pre><code>version: &#39;3&#39;
services:
[NAME1]:
image: &#34;image/name&#34;
ports:
- 81:80
- 80808080
environment:
HOSTNAME: &#34;cc&#34;
PORT: 8181
volumes:
- nginx-data:/etc/nginx
[NAME2]:
image: &#39;xxx&#39;</code></pre></div><div class="hextra-code-copy-btn-container hx:opacity-0 hx:transition hx:group-hover/code:opacity-100 hx:flex hx:gap-1 hx:absolute hx:m-[11px] hx:right-0 hx:top-0">
<button
class="hextra-code-copy-btn hx:group/copybtn hx:cursor-pointer hx:transition-all hx:active:opacity-50 hx:bg-primary-700/5 hx:border hx:border-black/5 hx:text-gray-600 hx:hover:text-gray-900 hx:rounded-md hx:p-1.5 hx:dark:bg-primary-300/10 hx:dark:border-white/10 hx:dark:text-gray-400 hx:dark:hover:text-gray-50"
title="复制代码"
aria-label="复制代码"
data-copied-label="已复制!"
>
<div class="hextra-copy-icon hx:group-[.copied]/copybtn:hidden hx:pointer-events-none hx:h-4 hx:w-4"></div>
<div class="hextra-success-icon hx:hidden hx:group-[.copied]/copybtn:block hx:pointer-events-none hx:h-4 hx:w-4"></div>
</button>
</div>
</div>
<p>docker compose的ymal文件可以实现十分复杂的功能,我暂时也没搞懂,就只放一个基础结构的文件在这里。与docker run指令相同,<code>ports</code>字段指定了内外端口的映射,即&rsquo;外部:内部&rsquo;,卷映射同理。<code>environment</code>不需要 - 开头。</p>
<p>编写完ymal文件,就可以启动容器组了。首先切换到文件所在的目录,即工作目录,然后执行指令直接启动</p>
<blockquote>
<p><code>docker compose up</code> 启动容器,查找当前目录下的ymal文件。-d 参数可以转入后台运行。 -f参数可以指定ymal文件。</p>
<p><code>docker compose down</code> 停止容器,并删除对应的容器和网络</p>
<p><code>docker compose exec NAME command</code> 在ymal文件内其中一个容器里运行指令</p>
</blockquote>
<p>docker compose指令必须是要有ymal文件才能运行的,它通过这个文件来寻找有关的网络和容器。</p>
<p>目前浅学了一下,只有学一点更新一点吧。</p>
</div>
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