mongodb集群性能优化

在前面两篇文章，我们介绍了如何去搭建mongodb集群，这篇文章我们将介绍如何去优化mongodb的各项配置，以达到最优的效果。

警告

不做任何的优化，集群搭建完成之后，使用命令连接mongodb终端，一般会遇到以下的警告信息：

如何你是用的是我最新一版集群搭建的脚本，估计警告会少几个，因为里面已经做了一些优化

2017-08-16T18:33:42.985+0800 I STORAGE  [initandlisten] ** WARNING: Using the XFS filesystem is strongly recommended with the WiredTiger storage engine
2017-08-16T18:33:42.985+0800 I STORAGE  [initandlisten] **          See http://dochub.mongodb.org/core/prodnotes-filesystem
2017-08-16T18:33:43.024+0800 I CONTROL  [initandlisten] 
2017-08-16T18:33:43.024+0800 I CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
2017-08-16T18:33:43.024+0800 I CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
2017-08-16T18:33:43.024+0800 I CONTROL  [initandlisten] 
2017-08-16T18:33:43.025+0800 I CONTROL  [initandlisten] 
2017-08-16T18:33:43.025+0800 I CONTROL  [initandlisten] ** WARNING: You are running on a NUMA machine.
2017-08-16T18:33:43.025+0800 I CONTROL  [initandlisten] **          We suggest launching mongod like this to avoid performance problems:
2017-08-16T18:33:43.025+0800 I CONTROL  [initandlisten] **              numactl --interleave=all mongod [other options]
2017-08-16T18:33:43.026+0800 I CONTROL  [initandlisten] 
2017-08-16T18:33: