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docker安装sshd以及修改镜像源和软件源.html
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<h1 id="总览"><a href="#总览" class="headerlink" title="总览"></a>总览</h1><p>因为最近公司需要在容器中跑深度学习任务，所以需要tensorflow的镜像。并且要求在要通过ssh进行容器的通信。这篇文章主要介绍如何在docker容器中安装软件，如何修改docker镜像源以及修改容器内部软件源地址。<br>宿主机环境：</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">uname</span> -r : 3.10.0-862.11.6.el7.x86_64</span><br><span class="line"><span class="built_in">cat</span> /etc/redhat-release : CentOS Linux release 7.5.1804 (Core)</span><br><span class="line">docker version : 18.06.0-ce</span><br></pre></td></tr></table></figure>
<p>镜像主要选择的是官方的tensorflow:1.12.0-py3版本,镜像里面使用的系统环境下面会介绍</p>
<h2 id="修改docker镜像源"><a href="#修改docker镜像源" class="headerlink" title="修改docker镜像源"></a>修改docker镜像源</h2><p><a href="https://www.docker-cn.com/registry-mirror">!参考</a><br>由于docker 官方的镜像源在国外，导致下载速度很慢。所以第一步是修改docker镜像源地址。我这里采用永久修改docker镜像源地址。打开<code>/etc/docker/daemon.json</code>（如果没有此文件，则新建）,添加如下内容：</p>
<figure class="highlight yaml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">{</span><br><span class="line"> <span class="attr">"registry-mirrors":</span> [<span class="string">"https://registry.docker-cn.com"</span>]</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>然后运行<code>docker pull registry.docker-cn.com/tensorflow/tensorflow:1.12.0-py3</code><br>即可以拉取镜像，而且可以看到速度提升很快</p>
<h2 id="启动镜像"><a href="#启动镜像" class="headerlink" title="启动镜像"></a>启动镜像</h2><p>我们可以使用<code>docker images</code>查看本机有的镜像。针对上面拉取的tensorflow:1.12.0-py3镜像，我们执行下面命令启动</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 run -it [image_name] /bin/bash</span><br></pre></td></tr></table></figure>
<p>此时我们应该是在启动的容器中。我们可以查看容器具体的系统信息。因为tensorflow基础镜像是ubuntu，所以这里运行以下命令,因为容器中一般不会有vim命令，所以采用cat命令参看系统信息。注意下面的命令都是在容器中键入</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">uname</span> -r</span><br><span class="line"><span class="built_in">cat</span> /etc/issue</span><br></pre></td></tr></table></figure>
<p>查看得到系统信息为:Ubuntu 16.04.5 LTS</p>
<h2 id="修改容器中软件源地址"><a href="#修改容器中软件源地址" class="headerlink" title="修改容器中软件源地址"></a>修改容器中软件源地址</h2><p>由于容器中软件源默认地址是国外的，这里换成国内的。</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">cd</span> /etc/apt</span><br><span class="line"><span class="built_in">cp</span> sources.list sources.list.bak</span><br></pre></td></tr></table></figure>
<p>这里使用阿里的镜像源，将sources.list里面的内容修改为如下内容:</p>
<figure class="highlight yaml"><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><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment"># 默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释</span></span><br><span class="line"><span class="string">deb</span> <span class="string">http://mirrors.aliyun.com/ubuntu/</span> <span class="string">xenial</span> <span class="string">main</span> <span class="string">restricted</span> <span class="string">universe</span> <span class="string">multiverse</span></span><br><span class="line"><span class="comment"># deb-src http://mirrors.aliyun.com/ubuntu/ xenial main main restricted universe multiverse</span></span><br><span class="line"><span class="string">deb</span> <span class="string">http://mirrors.aliyun.com/ubuntu/</span> <span class="string">xenial-updates</span> <span class="string">main</span> <span class="string">restricted</span> <span class="string">universe</span> <span class="string">multiverse</span></span><br><span class="line"><span class="comment"># deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse</span></span><br><span class="line"><span class="string">deb</span> <span class="string">http://mirrors.aliyun.com/ubuntu/</span> <span class="string">xenial-backports</span> <span class="string">main</span> <span class="string">restricted</span> <span class="string">universe</span> <span class="string">multiverse</span></span><br><span class="line"><span class="comment"># deb-src http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse</span></span><br><span class="line"><span class="string">deb</span> <span class="string">http://mirrors.aliyun.com/ubuntu/</span> <span class="string">xenial-security</span> <span class="string">main</span> <span class="string">restricted</span> <span class="string">universe</span> <span class="string">multiverse</span></span><br><span class="line"><span class="comment"># deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiverse</span></span><br><span class="line"></span><br><span class="line"><span class="comment"># 预发布软件源，不建议启用</span></span><br><span class="line"><span class="comment"># deb http://mirrors.aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse</span></span><br><span class="line"><span class="comment"># deb-src http://mirrors.aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse</span></span><br></pre></td></tr></table></figure>
<h2 id="容器中安装软件"><a href="#容器中安装软件" class="headerlink" title="容器中安装软件"></a>容器中安装软件</h2><figure class="highlight bash"><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></pre></td><td class="code"><pre><span class="line">passwd</span><br><span class="line">apt-get update</span><br><span class="line">apt-get install vim</span><br><span class="line">apt-get install openssh-sshd</span><br></pre></td></tr></table></figure>
<p>修改root密码以及安装完上面vim和openssh-sshd两个软件后，修改openssh-sshd配置文件内容。打开<code>/etc/ssh/sshd_config</code>将<code>PermitRootLogin</code>后面添加yes，即允许以root用户登录。后面启动sshd命令可能会报错，具体问题可以自己上网上搜索</p>
<h2 id="生成镜像"><a href="#生成镜像" class="headerlink" title="生成镜像"></a>生成镜像</h2><p>退出镜像，将容器提交为镜像</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 commit [containerID] [image_name]</span><br></pre></td></tr></table></figure>
<p>执行<code>docker images</code>可以看到生成的镜像。启动此镜像并开启sshd服务命令如下</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">docker run -d -p 50001:22 [images_name] /usr/sbin/sshd -D</span><br><span class="line">其中 -d表示已后台方式启动容器，-p挂载端口 ，/usr/sbin/sshd -D 是启动命令</span><br></pre></td></tr></table></figure>
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