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配置环境：
CentOS release 6.8
pyenv 20160509
在工作开发中，一直使用 virtualenv 来管理python的包环境。很好的解决了不同项目使用不同python包的需求。对于多python版本的问题如何解决一直无解，虽然可以安装多个
版本的python，靠绝对路
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mongodb 3.2 用户权限管理配置
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使用mongodb 有段时间了，由于是在内网使用，便没有设置权限，一直是裸奔。
最近有时间，研究了下mongodb 3.2 的用户权限配置，网上有许多用户权限配置的文章，不过大多是之前版本，有些出入，特记录备查。
环境MongoDB shell version: 3.2.6
CentOS relea
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Q & A：错误信息：
[root@localhost master]# mongod -f master.conf
about to fork child process, waiting until server is ready for connections.
forked proc
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转载 - 高可用的MongoDB集群
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<p>刚接触MongoDB，就要用到它的集群，只能硬着头皮短时间去看文档和尝试自行搭建。迁移历史数据更是让人恼火，近100G的数据文件，导入、清理垃圾数据执行的速度蜗牛一样的慢。趁着这个时间，把这几天关于Mongod集群相关的内容整理一下。大概介绍一下MongoDB集群的几种方式：Master-Slave、Relica Set、Sharding，并做简单的演示。</p>
<p>使用集群的目的就是提高可用性。高可用性H.A.（High Availability）指的是通过尽量缩短因日常维护操作（计划）和突发的系统崩溃（非计划）所导致的停机时间，以提高系统和应用的可用性。它与被认为是不间断操作的容错技术有所不同。HA系统是目前企业防止核心计算机系统因故障停机的最有效手段。</p>
<p>HA的三种工作方式：</p>
<ul>
<li>主从方式 （非对称方式）</li>
</ul>
<p>工作原理：主机工作，备机处于监控准备状况；当主机宕机时，备机接管主机的一切工作，待主机恢复正常后，按使用者的设定以自动或手动方式将服务切换到主机上运行，数据的一致性通过共享存储系统解决。</p>
<ul>
<li>双机双工方式（互备互援）</li>
</ul>
<p>工作原理：两台主机同时运行各自的服务工作且相互监测情况，当任一台主机宕机时，另一台主机立即接管它的一切工作，保证工作实时，应用服务系统的关键数据存放在共享存储系统中。</p>
<ul>
<li>集群工作方式（多服务器互备方式）</li>
</ul>
<p>工作原理：多台主机一起工作，各自运行一个或几个服务，各为服务定义一个或多个备用主机，当某个主机故障时，运行在其上的服务就可以被其它主机接管</p>
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