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<h1 id="docker">Docker 安装和基础用法<a class="headerlink" href="#docker" title="Permanent link">&para;</a></h1>
<h2 id="docker_1">Docker 的基本操作<a class="headerlink" href="#docker_1" title="Permanent link">&para;</a></h2>
<h3 id="docker_2">Docker 容器的状态机<a class="headerlink" href="#docker_2" title="Permanent link">&para;</a></h3>
<p><a class="glightbox" href="https://static.cyub.vip/images/202107/docker-status.jpeg" data-type="image" data-width="auto" data-height="auto" data-desc-position="bottom"><img alt="" src="https://static.cyub.vip/images/202107/docker-status.jpeg" /></a></p>
<p>一个容器在某个时刻可能处于以下几种状态之一:</p>
<ul>
<li>created已经被创建 (使用 docker ps -a 命令可以列出)但是还没有被启动 (使用 docker ps 命令还无法列出)</li>
<li>running运行中</li>
<li>paused容器的进程被暂停了</li>
<li>restarting容器的进程正在重启过程中</li>
<li>exited上图中的 stopped 状态,表示容器之前运行过但是现在处于停止状态(要区别于 created 状态,它是指一个新创出的尚未运行过的容器)。可以通过 start 命令使其重新进入 running 状态</li>
<li>destroyed容器被删除了再也不存在了</li>
</ul>
<p>你可以在 docker inspect 命令的输出中查看其详细状态:</p>
<div class="language-text highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a>&quot;State&quot;: {
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a> &quot;Status&quot;: &quot;running&quot;,
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a> &quot;Running&quot;: true,
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a> &quot;Paused&quot;: false,
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a> &quot;Restarting&quot;: false,
</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a> &quot;OOMKilled&quot;: false,
</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a> &quot;Dead&quot;: false,
</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a> &quot;Pid&quot;: 4597,
</span><span id="__span-0-9"><a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a> &quot;ExitCode&quot;: 0,
</span><span id="__span-0-10"><a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a> &quot;Error&quot;: &quot;&quot;,
</span><span id="__span-0-11"><a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a> &quot;StartedAt&quot;: &quot;2016-09-16T08:09:34.53403504Z&quot;,
</span><span id="__span-0-12"><a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a> &quot;FinishedAt&quot;: &quot;2016-09-16T08:06:44.365106765Z&quot;
</span><span id="__span-0-13"><a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a> }
</span></code></pre></div>
<h3 id="docker_3">Docker 命令概述<a class="headerlink" href="#docker_3" title="Permanent link">&para;</a></h3>
<ol>
<li>容器从生到死整个生命周期</li>
</ol>
<div class="language-text highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a>root@devstack:/home/sammy# docker create --name web31 training/webapp python app.py #创建名字为 web31 的容器
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a>7465f4cb7c49555af32929bd1bc4213f5e72643c0116450e495b71c7ec128502
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a>root@devstack:/home/sammy# docker inspect --format=&#39;{{.State.Status}}&#39; web31 #其状态为 created
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a>created
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a>root@devstack:/home/sammy# docker start web31 #启动容器
</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a>web31root@devstack:/home/sammy# docker exec -it web31 /bin/bash #在容器中运行 bash 命令
</span><span id="__span-1-7"><a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a>root@devstack:/home/sammy# docker inspect --format=&#39;{{.State.Status}}&#39; web31 #其状态为 running
</span><span id="__span-1-8"><a id="__codelineno-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></a>running
</span><span id="__span-1-9"><a id="__codelineno-1-9" name="__codelineno-1-9" href="#__codelineno-1-9"></a>root@devstack:/home/sammy# docker pause web31 #暂停容器
</span><span id="__span-1-10"><a id="__codelineno-1-10" name="__codelineno-1-10" href="#__codelineno-1-10"></a>web31
</span><span id="__span-1-11"><a id="__codelineno-1-11" name="__codelineno-1-11" href="#__codelineno-1-11"></a>root@devstack:/home/sammy# docker inspect --format=&#39;{{.State.Status}}&#39; web31
</span><span id="__span-1-12"><a id="__codelineno-1-12" name="__codelineno-1-12" href="#__codelineno-1-12"></a>paused
</span><span id="__span-1-13"><a id="__codelineno-1-13" name="__codelineno-1-13" href="#__codelineno-1-13"></a>root@devstack:/home/sammy# docker unpause web31 #继续容器
</span><span id="__span-1-14"><a id="__codelineno-1-14" name="__codelineno-1-14" href="#__codelineno-1-14"></a>web31
</span><span id="__span-1-15"><a id="__codelineno-1-15" name="__codelineno-1-15" href="#__codelineno-1-15"></a>root@devstack:/home/sammy# docker inspect --format=&#39;{{.State.Status}}&#39; web31
</span><span id="__span-1-16"><a id="__codelineno-1-16" name="__codelineno-1-16" href="#__codelineno-1-16"></a>running
</span><span id="__span-1-17"><a id="__codelineno-1-17" name="__codelineno-1-17" href="#__codelineno-1-17"></a>root@devstack:/home/sammy# docker rename web31 newweb31 #重命名
</span><span id="__span-1-18"><a id="__codelineno-1-18" name="__codelineno-1-18" href="#__codelineno-1-18"></a>root@devstack:/home/sammy# docker inspect --format=&#39;{{.State.Status}}&#39; newweb31
</span><span id="__span-1-19"><a id="__codelineno-1-19" name="__codelineno-1-19" href="#__codelineno-1-19"></a>running
</span><span id="__span-1-20"><a id="__codelineno-1-20" name="__codelineno-1-20" href="#__codelineno-1-20"></a>root@devstack:/home/sammy# docker top newweb31 #在容器中运行 top 命令
</span><span id="__span-1-21"><a id="__codelineno-1-21" name="__codelineno-1-21" href="#__codelineno-1-21"></a>UID PID PPID C STIME TTY TIME CMD
</span><span id="__span-1-22"><a id="__codelineno-1-22" name="__codelineno-1-22" href="#__codelineno-1-22"></a>root 5009 4979 0 16:28 ? 00:00:00 python app.py
</span><span id="__span-1-23"><a id="__codelineno-1-23" name="__codelineno-1-23" href="#__codelineno-1-23"></a>root@devstack:/home/sammy# docker logs newweb31 #获取容器的日志
</span><span id="__span-1-24"><a id="__codelineno-1-24" name="__codelineno-1-24" href="#__codelineno-1-24"></a> * Running on http://0.0.0.0:5000/ (Press CTRL+C to quit)
</span><span id="__span-1-25"><a id="__codelineno-1-25" name="__codelineno-1-25" href="#__codelineno-1-25"></a>root@devstack:/home/sammy# docker stop newweb31 #停止容器
</span><span id="__span-1-26"><a id="__codelineno-1-26" name="__codelineno-1-26" href="#__codelineno-1-26"></a>newweb31
</span><span id="__span-1-27"><a id="__codelineno-1-27" name="__codelineno-1-27" href="#__codelineno-1-27"></a>root@devstack:/home/sammy# docker inspect --format=&#39;{{.State.Status}}&#39; newweb31
</span><span id="__span-1-28"><a id="__codelineno-1-28" name="__codelineno-1-28" href="#__codelineno-1-28"></a>exited
</span><span id="__span-1-29"><a id="__codelineno-1-29" name="__codelineno-1-29" href="#__codelineno-1-29"></a>root@devstack:/home/sammy# docker rm newweb31 #删除容器
</span><span id="__span-1-30"><a id="__codelineno-1-30" name="__codelineno-1-30" href="#__codelineno-1-30"></a>newweb31
</span><span id="__span-1-31"><a id="__codelineno-1-31" name="__codelineno-1-31" href="#__codelineno-1-31"></a>root@devstack:/home/sammy# docker inspect --format=&#39;{{.State.Status}}&#39; newweb31
</span><span id="__span-1-32"><a id="__codelineno-1-32" name="__codelineno-1-32" href="#__codelineno-1-32"></a>Error: No such image, container or task: newweb31
</span></code></pre></div>
<ol>
<li>docker stop 和 docker kill</li>
</ol>
<p>在docker stop 命令执行的时候会先向容器中PID为1的进程发送系统信号 SIGTERM然后等待容器中的应用程序终止执行如果等待时间达到设定的超时时间默认为 10秒用户可以指定特定超时时长会继续发送SIGKILL的系统信号强行kill掉进程。在容器中的应用程序可以选择忽略和不处理SIGTERM信号不过一旦达到超时时间程序就会被系统强行kill掉因为SIGKILL信号是直接发往系统内核的应用程序没有机会去处理它。</p>
<p>比如运行 docker stop web5 -t 20 命令。</p>
<ol>
<li>
<p>使用 docker cp 在 host 和 container 之间拷贝文件或者目录</p>
</li>
<li>
<p>docker export 和 import</p>
</li>
</ol>
<p>docker export将一个容器的文件系统打包为一个压缩文件</p>
<div class="language-text highlight"><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a>root@devstack:/home/sammy# docker export web5 -o ./web5
</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a>root@devstack:/home/sammy# ls
</span><span id="__span-2-3"><a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a>chroot devstack Dockerfile mongodbdocker mydockerbuild web5 webapp
</span></code></pre></div>
<p>docker import从一个压缩文件创建一个镜像</p>
<div class="language-text highlight"><pre><span></span><code><span id="__span-3-1"><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a>root@devstack:/home/sammy# docker import web5 web5img -m &quot;imported on 0916&quot;
</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a>sha256:745bb258be0a69a517367667646148bb2f662565bb3d222b50c0c22e5274a926
</span><span id="__span-3-3"><a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a>root@devstack:/home/sammy# docker history web5img
</span><span id="__span-3-4"><a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a>IMAGE CREATED CREATED BY SIZE COMMENT
</span><span id="__span-3-5"><a id="__codelineno-3-5" name="__codelineno-3-5" href="#__codelineno-3-5"></a>745bb258be0a 6 seconds ago
</span></code></pre></div>
<h2 id="_1">资料<a class="headerlink" href="#_1" title="Permanent link">&para;</a></h2>
<ul>
<li><a href="https://www.cnblogs.com/sammyliu/p/5875470.html">Docker 安装和基础用法</a></li>
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