先收集，後續再實踐。

MongoDB的集群應該和MySQL的定位保持一致，因為要認為它就是一個數據庫。

集群方式有也是有很多，比如分庫，分片，主從，主主等等。

下面是收集的一些教程：

http://blog.chinaunix.net/uid-20104120-id-5012786.html

http://www.ttlsa.com/mongodb/the-architecture-of-mongodb-mongodb-fragment-cluster-and-simple-construction-scheme/

http://lipengjavablog.iteye.com/blog/1919271

http://bguncle.blog.51cto.com/3184079/1333623/

http://database.51cto.com/art/201505/475583.htm

http://developer.51cto.com/art/201403/434054_all.htm

http://www.jb51.net/article/87916.htm

http://hunan.iteye.com/blog/2095605

http://www.csdn.net/article/2014-04-24/2819492-2819221-build-high-avialable-mongodb-cluster-part-2/2

http://blog.csdn.net/mniwc/article/details/8227018

http://blog.csdn.net/doitsjz/article/details/72862026

http://blog.csdn.net/feihuadao/article/details/52923892

http://blog.csdn.net/wang1144/article/details/53964999

https://www.2cto.com/database/201608/543064.html

https://wenku.baidu.com/view/4881e2ce941ea76e58fa04ab.html

http://blog.jobbole.com/72610/

http://www.lanceyan.com/tech/arch/mongodb_shard1.html

http://blog.csdn.net/bluejoe2000/article/details/41323051

http://www.csdn.net/article/2014-04-09/2819221-build-high-avialable-mongodb-cluster-part-1/2

http://www.cnblogs.com/binyue/p/5901328.html

https://yq.aliyun.com/articles/61516

MongoDB集群搭建教程收集（待實踐）