Centos下安装docker教程
<p><strong>通过yum安装</strong></p>
<p>
需要root或者能sudo的权限</p>
<p>
<strong>yum包更新到最新</strong></p>
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<code class="bash plain">$ </code><code class="bash functions">sudo</code> <code class="bash plain">yum update</code>
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<strong>添加Docker yum源</strong></p>
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<code class="bash plain">$ </code><code class="bash functions">sudo</code> <code class="bash functions">tee</code> <code class="bash plain">/etc/yum</code><code class="bash plain">.repos.d</code><code class="bash plain">/docker</code><code class="bash plain">.repo <<-</code><code class="bash string">'EOF'</code>
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<code class="bash plain">name=Docker Repository</code>
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<code class="bash plain">baseurl=https:</code><code class="bash plain">//yum</code><code class="bash plain">.dockerproject.org</code><code class="bash plain">/repo/main/centos/</code><code class="bash plain">$releasever/</code>
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<code class="bash plain">enabled=1</code>
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<code class="bash plain">gpgcheck=1</code>
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<code class="bash plain">gpgkey=https:</code><code class="bash plain">//yum</code><code class="bash plain">.dockerproject.org</code><code class="bash plain">/gpg</code>
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<code class="bash plain">EOF</code>
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<strong>安装Docker包</strong></p>
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<code class="bash plain">$ </code><code class="bash functions">sudo</code> <code class="bash plain">yum </code><code class="bash functions">install</code> <code class="bash plain">docker-engine</code>
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<strong>启动Docker守护进程</strong></p>
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<code class="bash plain">$ </code><code class="bash functions">sudo</code> <code class="bash plain">service docker start</code>
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通过测试镜像运行一个容器来验证Docker是否安装正确</p>
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<code class="bash plain">$ </code><code class="bash functions">sudo</code> <code class="bash plain">docker run hello-world</code>
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<code class="bash plain">Unable to </code><code class="bash functions">find</code> <code class="bash plain">image </code><code class="bash string">'hello-world:latest'</code> <code class="bash plain">locally</code>
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<code class="bash spaces"> </code><code class="bash plain">latest: Pulling from hello-world</code>
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<code class="bash spaces"> </code><code class="bash plain">a8219747be10: Pull complete</code>
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<code class="bash spaces"> </code><code class="bash plain">91c95931e552: Already exists</code>
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<code class="bash spaces"> </code><code class="bash plain">hello-world:latest: The image you are pulling has been verified. Important: image verification is a tech preview feature and should not be relied on to provide security.</code>
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<code class="bash spaces"> </code><code class="bash plain">Digest: sha256:aa03e5d0d5553b4c3473e89c8619cf79df368babd1.7.1cf5daeb82aab55838d</code>
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<code class="bash spaces"> </code><code class="bash plain">Status: Downloaded newer image </code><code class="bash keyword">for</code> <code class="bash plain">hello-world:latest</code>
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<code class="bash spaces"> </code><code class="bash plain">Hello from Docker.</code>
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<code class="bash spaces"> </code><code class="bash plain">This message shows that your installation appears to be working correctly.</code>
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<code class="bash spaces"> </code><code class="bash plain">To generate this message, Docker took the following steps:</code>
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<code class="bash spaces"> </code><code class="bash plain">1. The Docker client contacted the Docker daemon.</code>
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<code class="bash spaces"> </code><code class="bash plain">2. The Docker daemon pulled the </code><code class="bash string">"hello-world"</code> <code class="bash plain">image from the Docker Hub.</code>
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<code class="bash spaces"> </code><code class="bash plain">(Assuming it was not already locally available.)</code>
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<code class="bash spaces"> </code><code class="bash plain">3. The Docker daemon created a new container from that image </code><code class="bash functions">which</code> <code class="bash plain">runs the</code>
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<code class="bash spaces"> </code><code class="bash plain">executable that produces the output you are currently reading.</code>
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<code class="bash spaces"> </code><code class="bash plain">4. The Docker daemon streamed that output to the Docker client, </code><code class="bash functions">which</code> <code class="bash plain">sent it</code>
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<code class="bash spaces"> </code><code class="bash plain">to your terminal.</code>
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<code class="bash spaces"> </code><code class="bash plain">To try something </code><code class="bash functions">more</code> <code class="bash plain">ambitious, you can run an Ubuntu container with:</code>
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<code class="bash spaces"> </code><code class="bash plain">$ docker run -it ubuntu </code><code class="bash functions">bash</code>
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<code class="bash spaces"> </code><code class="bash plain">For </code><code class="bash functions">more</code> <code class="bash plain">examples and ideas, visit:</code>
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<code class="bash spaces"> </code><code class="bash plain">http:</code><code class="bash plain">//docs</code><code class="bash plain">.docker.com</code><code class="bash plain">/userguide/</code>
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<strong>通过脚本安装</strong></p>
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需要root或者能sudo的权限</p>
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<strong>yum包更新到最新</strong></p>
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<code class="bash plain">$ </code><code class="bash functions">sudo</code> <code class="bash plain">yum update</code>
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<strong>运行Docker安装脚本</strong></p>
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<code class="bash plain">$ curl -sSL https:</code><code class="bash plain">//get</code><code class="bash plain">.docker.com/ | sh</code>
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这个脚本会添加docker.repo仓库并且安装Docker</p>
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<strong>启动Docker守护进程</strong></p>
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<code class="bash plain">$ </code><code class="bash functions">sudo</code> <code class="bash plain">service docker start</code>
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通过测试镜像运行一个容器来验证Docker是否安装正确</p>
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<code class="bash plain">$ </code><code class="bash functions">sudo</code> <code class="bash plain">docker run hello-world</code>
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<strong>创建一个Docker用户组</strong></p>
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docker守护进程绑定在Unix socket 而不是 TCP 端口。默认情况下Unix socket属于root用户和具有sudo权限用户的使用范畴。出于这个原因，docker守护进程需要一直在root用户下面运行。</p>
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<span>To avoid having to use sudo when you use the docker command, create a Unix group called docker and add users to it. When the docker daemon starts, it makes the ownership of the Unix socket read/writable by the docker group.</span></p>
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为了避免运行docker命令的时候需要使用sudo命令，创建一个叫docker的Unix用户组并将需要运行docker的用户添加进去。当开始运行docker守护进程，会令docker用户组的成员拥有Unix socket的读写权限。</p>
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创建docker用户组并添加用户：</p>
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1.需要root或者能sudo的权限<br>
2.创建docker用户组并添加用户</p>
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3.退出并且登录到your_username，如果在your_username下也建议退出再重新登录一次，这确保您的用户正在运行正确的权限。<br>
4.验证运行docker已不再需要sudo命令</p>
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<strong>开机运行docker</strong></p>
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<code class="bash plain">$ </code><code class="bash functions">sudo</code> <code class="bash plain">chkconfig docker on</code>
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