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            <a href="/2025/01/26/pymemcache-ignore-exc/" class="post-title-link" itemprop="url">使用 pymemcache 别忘了设置 ignore_exc</a>
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          <p>我们在把 Django 升级到 4.2 版本以后，开始把 python-memcached 给换成 pymemcache。结果换完之后，发现怎么默认配置情况下不能高可用了，如果配置了多个 memcached 的后端，挂了一个后，使用缓存相关的代码直接会报错。</p>
<p>查了下官方文档才发现，pymemcache 默认情况下遇到连接失败就是会抛出异常，除非是手动指定下 ignore_exc = True。</p>
<p>于是，将 Django CACHES 的配置修改成这样，在 OPTION 中加入相关配置就好了：</p>
<figure class="highlight plain"><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></pre></td><td class="code"><pre><span class="line">CACHES &#x3D; &#123;</span><br><span class="line">    &#39;default&#39;: &#123;</span><br><span class="line">        &#39;BACKEND&#39;: &#39;django.core.cache.backends.memcached.PyMemcacheCache&#39;,</span><br><span class="line">        &#39;LOCATION&#39;: [</span><br><span class="line">            &#39;host1:11211&#39;,</span><br><span class="line">            &#39;host2&#39;:11211,</span><br><span class="line">        ],</span><br><span class="line">        &#39;OPTIONS&#39;: &#123;</span><br><span class="line">            &#39;ignore_exc&#39;: True,  # 设置成 True</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>



      
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            <a href="/2023/05/06/install-pandas-on-kylin-v10-with-sw64-cpu/" class="post-title-link" itemprop="url">申威架构(sw_64)的Kylin V10系统上安装pandas</a>
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          <p>最近在做一些国产化适配的工作，让自己的系统能跑在申威架构的CPU上。这几年国产CPU如雨后春笋一般涌现出来，感慨一下，放我刚工作的那几年真是想都不敢想。</p>
<p>申威架构的CPU与ARM架构的CPU不同，更加小众，国内也就UOS和Kylin对其有支持。客户提供的操作系统是Kylin V10的SW_64版本，本文就记录下在这个架构CPU+Kylin V10环境下装Pandas遇到的问题。</p>
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            <a href="/2022/10/27/fix-mac-os-13-ventura-git-ssh-permission-denied/" class="post-title-link" itemprop="url">修复升级Macos 13 Ventura后Git报Pemission Denied的问题</a>
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          <p>最近尝鲜升级了mac os 13 ventura，结果发现git push代码的时候怎么都不行，直接报了个错误: </p>
<figure class="highlight plain"><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">Permission denied (publickey).</span><br><span class="line">fatal: Could not read from remote repository.</span><br><span class="line"></span><br><span class="line">Please make sure you have the correct access rights</span><br></pre></td></tr></table></figure>
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          <p>我们一直使用python-memcached库来操作memcached，最近发现在python3.8的环境中，代码会报类似这样的警告：</p>
<figure class="highlight plain"><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">memcache.py:1303: SyntaxWarning: &quot;is&quot; with a literal. Did you mean &quot;&#x3D;&#x3D;&quot;?</span><br><span class="line">  if key is &#39;&#39;:</span><br><span class="line">memcache.py:1304: SyntaxWarning: &quot;is&quot; with a literal. Did you mean &quot;&#x3D;&#x3D;&quot;?</span><br><span class="line">  if key_extra_len is 0:</span><br></pre></td></tr></table></figure>
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          <p>最近尝试使用nginx来提供一些静态的json文件来作为配置，最为简单的做法就是提供下面这样的配置了：</p>
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          <p>用Certbot来自动生成Let’s Encrypt证书这件事儿，虽然官方和网上已经有了很详实的文档了，但是我还是想自己记录下，留作以后备查吧。</p>
<p>本文用的操作系统是ubuntu 20.04，DNS的话用的是Cloudflare的服务，web服务使用nginx来提供。然后，按照以下步骤进行就可以了。</p>
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          <p>首先添加下全局的pip代理：</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">pip config --user setglobal.index-url https:&#x2F;&#x2F;pypi.tuna.tsinghua.edu.cn&#x2F;simple</span><br></pre></td></tr></table></figure>

<p>然后下载安装脚本到本地(比如保存成install-poetry.py文件)：</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">curl -sSL https:&#x2F;&#x2F;install.python-poetry.org -o install-poetry.py</span><br></pre></td></tr></table></figure>

<p>打开脚本进行编辑，找到如下这段代码：</p>
<figure class="highlight plain"><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">def pip(self, *args, **kwargs) -&gt; subprocess.CompletedProcess:</span><br><span class="line">        return self.python(&quot;-m&quot;, &quot;pip&quot;, &quot;--isolated&quot;, *args, **kwargs)</span><br></pre></td></tr></table></figure>

<p>把里面的”–isolated”删除掉，然后安装脚本使用pip时就会自动使用之前配置好的镜像了:</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">python3 install install-poetry.py</span><br></pre></td></tr></table></figure>


      
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          <p>最近琢磨给自己的系统加上个Agent来实现配置变更和监控信息采集等任务，因为这个系统是多实例部署的，所以这些Agent可能需要同时运行相同的任务。因为我们正好在用celery，celery支持广播任务，所有的worker都能收到相同的任务，正好就能用这个特性来实现Agent的功能了。</p>
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          <p>我这边的一个系统用了telegraf的snmp_trap插件来采集snmp trap告警，然后再转换为http格式吐出进入下一个环节。这个插件配置起来倒是简单，但是其中对于OID的翻译依赖于snmptranslate命令的结果，而如果让snmptranslate命令能正常翻译，又依赖于MIB库文件的正确放置和配置。最近在用这套东西来采集H3C交换机设备的告警，正好记录下在ubuntu环境下导入MIB库文件的方法。</p>
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          <p>最近要在自动构建中加入个打tag的操作，却发现可能是gitlab的bug，之前加过的默认deploy key怎么都找不到了。没办法，只好在打包服务器上再创建一个SSH密钥对，让执行git命令时使用这个新的SSH密钥。</p>
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