Collect first, follow up again practice.
The MongoDB cluster should be consistent with the location of MySQL because it is considered a database.
There are many ways to cluster, such as sub-Library, Shard, master and slave, main master and so on.
Here are some of the tutorials that are collected:
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 Cluster Build Tutorial collection (to be practiced)