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<a class="post-title-link" href="/posts/fix-django3-mysqlclient-import-error/" itemprop="url">Django3 中遇到django.core.exceptions.ImproperlyConfigured mysqlclient 1.3.13 or newer is required; you have 0.9.3.异常的解决方案</a></h1>
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<p>Django 近期发布了3.0版本，其中首度支持了asyncio让人兴奋, 为此引入了新的网关接口协议ASGI。<br>按异步IO的实现原理，即使使用ASGI替代WSGI部署Web应用，如果使用了一些同步库，肯定还是会阻塞IOLoop的，使应用失去异步特性。<br>但是Django的应用场景很多是有状态的，不得不使用一些带状态的库和函数。比如在MySQL中执行事务，或一些前后状态依赖的逻辑，就不太可能异步出去。<br>个人觉得可以用Django路由对同步/异步部分逻辑做划分，部署时启动多个端口或部署到多个节点上，再用nginx基于path把同步/异步请求反向代理到不同的upstream上，避免同步逻辑阻塞异步逻辑，以此发挥ASGI的异步高并发特性。</p>
<hr>
<p>下面进入正题:<br>安装Django3后不想折腾mysqlclient那堆库文件，直接装了pymysql替代mysqlclient。还是老办法，<code>__init__.py</code> 中patch一下:</p>
<pre><code>import pymysql
pymysql.install_as_MySQLdb()</code></pre><p>启动项目出现以下异常:</p>
<pre><code>raise ImproperlyConfigured('mysqlclient 1.3.13 or newer is required; you have %s.' % Database.__version__)
django.core.exceptions.ImproperlyConfigured: mysqlclient 1.3.13 or newer is required; you have 0.9.3.</code></pre>
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<a class="post-title-link" href="/posts/initd-rcd-systemd/" itemprop="url">init.d + rc.d VS systemd Ubuntu服务进程管理与开机自启动</a></h1>
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<p><img src="http://blogqn.qixincha.com/Systemctl_tw.png" alt=""></p>
<p>作为一名Ubuntu服务器深度用户，在Ubuntu 16.04版本之前一直使用<code>init.d</code> + <code>rc.d</code>套装来管理各种服务。</p>
<p>如：Nginx, ssh, docker, supervisord等。</p>
<p>Ubuntu 16.04 新增了一个服务进程管理工具 <code>systemd</code>。我将其理解为一个wrapper程序，封装了底层技术细节，使得交互更人性化。</p>
<p>两种命令都是无需安装任何包就可以直接使用，但是更推荐使用新的命令，以获得更佳的体验。</p>
<p>系统自带的各种服务，与dpkg包的默认配置的服务进程管理工具，都已迁移到systemd。足见官方对其推荐程度。</p>
<p>那么，<code>systemd</code>和<code>init.d</code> + <code>rc.d</code>分别是如何管理服务的呢？systemd的优势又在哪里？</p>
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<a class="post-title-link" href="/posts/live-for-yourself/" itemprop="url">为自己而活的时光</a></h1>
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<p>一个人的创业，</p>
<p>大抵是这样的，</p>
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<a class="post-title-link" href="/posts/django-xadmin/" itemprop="url">django-xadmin</a></h1>
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2016-08-05
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<p>Django xadmin是Django admin的替代品，功能更强大。能通过配置快速实现chart是我选择他的主要原因。另外还有第三方插件可以用于扩展。</p>
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<a class="post-title-link" href="/posts/use-django-wysiwyg-as-django-rich-text-editor/" itemprop="url">最好用的Django富文本编辑器</a></h1>
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<p>Django不自带富文本编辑器，但是富文本编辑器是做CRM系统不可缺的工具。我们前后尝试过多个富文本编辑器， 包括但不限于<code>Ueditor</code>, <code>Django-Summernote</code>等。<br>最后找到一个最合适的方案： <a target="_blank" href="https://github.com/django-ckeditor/django-ckeditor">django-ckeditor</a><br><img src="http://obdp0ndxs.bkt.clouddn.com/ckeditor.png" alt=""></p>
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