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<h2 id="部署出现Permission-denied问题"><a href="#部署出现Permission-denied问题" class="headerlink" title="部署出现Permission denied问题"></a>部署出现Permission denied问题</h2><p>换了新电脑后一直没有更新博客，只是把文章都同步了下来。<br><br> 今天想要hexo g&& hexo d的时候竟然出现</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">Permission denied(publickey)</span><br></pre></td></tr></table></figure>
<p>的问题。也不知道是什么回事。搜索后大致定位问题出现在ssh认证上。但是也不知道在哪有问题啊，当初新建hexo博客的时候也就按着步骤一步一步走就完了，ssh也没明白是什么回事，今天才了解。</p>
<h2 id="排查过程"><a href="#排查过程" class="headerlink" title="排查过程"></a>排查过程</h2><ol>
<li><p>首先用下列命令检查是哪里出了问题。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">ssh -T [email protected]</span><br></pre></td></tr></table></figure>
<p>最后几行会看到 <strong>id_rsa</strong>、<strong>id_rsa.pub</strong>两个文件的路径名。和permission denied(publickey)的错误</p>
</li>
<li><p>去C:/用户/.ssh/目录(我的是Windows系统)，发现并没有这两个文件。于是使用下面命令生成ssh密钥对</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">ssh-keygen</span><br></pre></td></tr></table></figure>
<p>执行完毕后，这两个文件就生成了</p>
</li>
<li><p>本以为这样就结束了。欢天喜地的再执行ssh -T <a href="mailto:[email protected]" target="_blank" rel="noopener">[email protected]</a>,发现还是permission denied。？？？<br> 原来是我没有在github的个人settings->SSH And GPG keys中添加公钥(id_rsa.pub的内容)。<br> 这里就要简单的讲一下ssh的原理了：是一种安全传输方式。利用<strong>非对称加密的方式来进行身份验证</strong>。非对称加密存在公钥和私钥密钥对，他们是<strong>成对匹配的</strong>。公钥放在服务器上，别人可以获取；而私钥存放在本地，别人无法截获。当你想要连接服务器时，会把私钥发送过去，<strong>服务器会测试公钥和私钥是否匹配</strong>，匹配则可以建立连接，推送代码。<br> <br> 理解了原理之后，为什么部署失败，也就清楚了。 </p>
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<a class="post-title-link" href="/2018/04/23/Leetcode167题解/" itemprop="url">Leetcode167题解</a></h1>
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<h2 id="问题描述"><a href="#问题描述" class="headerlink" title="问题描述"></a>问题描述</h2><p>给定一个升序排列的数组和目标和target。试找出数组中两个元素相加之和等于target的元素索引（下标+1） 题目限制：index1<index2 题目提示：可认为给定数组有且只有一组解，并且不会使用相同元素两次</p>
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<li>yum install gcc-c++。 为编译做准备</li>
<li>通过SSH将redis-版本.tar.gz 发送到Linux某个文件夹。Linux的Terminal下，进入文件夹，解压压缩包到指定路径 tar -xvf redis-版本.tar.gz -C /usr/local/</li>
<li>进入解压出来的文件夹redis-版本号，<strong>输入命令make编译</strong> ，这个时候只是编译出来了可执行文件，redis还未安装</li>
<li>使用 make PREFIX=/usr/local/redis install，安装redis到/usr/local/redis目录</li>
<li>cd .. —> cd redis ->cd bin —>./redis-server 就将redis启动了</li>
<li>重新打开一个Linux连接，再进入相同的目录，就会发现一个<strong>redis-cli </strong> ，是为客户端连接redis准备的</li>
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<p>上面的启动叫做前端启动模式，下面介绍后端启动</p>
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<li>将redis-版本号 文件夹内的redis.conf 复制到 /usr/local/redis/bin/下</li>
<li>修改redis.conf配置文件，<strong>daemonize yes</strong> </li>
<li>启动时，要指定配置文件 ./redis-server redis.conf</li>
<li>关闭：ps -ef | redis kill -9 进程号 （不推荐<strong>这种方法，redis持久化</strong>数据丢失<strong>）<br> </strong>正确**姿势：./server-cli shutdown</li>
<li>开启6379端口：/sbin/iptables -I INPUT -p tcp –dport 6379 -j ACCEPT<br> /etc/rc.d/init.d/iptables save <strong>为了jedis访问</strong></li>
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