An easiest way to create mongodb cluster in MacOs environment.

These steps can be executed one after the other in Mac Terminal.
Note: Make sure that the folders paths are correct before running these commands.

Create Initial directories required for mongo db cluter

cd /Users/prabhu/Documents/softwares/mongodb-osx-x86_64-4.0.6/bin/data

mkdir replica1 replica2 replica3 replica4 replica5 replica6 replica7 replica8 replica9 config1 config2 config3

Sudo chmod –R 777 repl*

Sudo chmod –R 777 conf*

shard1

./mongod –dbpath=/Users/prabhu/Documents/softwares/mongodb-osx-x86_64-4.0.6/bin/data/replica1 –port=27011 –bind_ip_all –replSet=replica1 –shardsvr

./mongod –dbpath=/Users/prabhu/Documents/softwares/mongodb-osx-x86_64-4.0.6/bin/data/replica2 –port=27012 –bind_ip_all –replSet=replica1 –shardsvr

./mongod –dbpath=/Users/prabhu/Documents/softwares/mongodb-osx-x86_64-4.0.6/bin/data/replica3 –port=27013 –bind_ip_all –replSet=replica1 –shardsvr

rs.initiate({_id:”replica1″,members:[{“_id”:1,”host”:”localhost:27011″}]})

rs.add(“localhost:27012”)

rs.add(“localhost:27013”)

shard2

./mongod –dbpath=/Users/prabhu/Documents/softwares/mongodb-osx-x86_64-4.0.6/bin/data/replica4 –port=27021 –bind_ip_all –replSet=replica2 –shardsvr

./mongod –dbpath=/Users/prabhu/Documents/softwares/mongodb-osx-x86_64-4.0.6/bin/data/replica5 –port=27022 –bind_ip_all –replSet=replica2 –shardsvr

./mongod –dbpath=/Users/prabhu/Documents/softwares/mongodb-osx-x86_64-4.0.6/bin/data/replica6 –port=27023 –bind_ip_all –replSet=replica2 –shardsvr

rs.initiate({_id:”replica2″,members:[{“_id”:1,”host”:”localhost:27021″}]})

rs.add(“localhost:27022”)

rs.add(“localhost:27023”)

Shard 3

./mongod –dbpath=/Users/prabhu/Documents/softwares/mongodb-osx-x86_64-4.0.6/bin/data/replica7 –port=27031 –bind_ip_all –replSet=replica3 –shardsvr

./mongod –dbpath=/Users/prabhu/Documents/softwares/mongodb-osx-x86_64-4.0.6/bin/data/replica8 –port=27032 –bind_ip_all –replSet=replica3 –shardsvr

./mongod –dbpath=/Users/prabhu/Documents/softwares/mongodb-osx-x86_64-4.0.6/bin/data/replica9 –port=27033 –bind_ip_all –replSet=replica3 –shardsvr

rs.initiate({_id:”replica3″,members:[{“_id”:1,”host”:”localhost:27031″}]})

rs.add(“localhost:27032”)

rs.add(“localhost:27033”)

config

./mongod –dbpath=/Users/prabhu/Documents/softwares/mongodb-osx-x86_64-4.0.6/bin/data/config1 –port=27018 –bind_ip_all –replSet=config1 –configsvr

./mongod –dbpath=/Users/prabhu/Documents/softwares/mongodb-osx-x86_64-4.0.6/bin/data/config2 –port=27019 –bind_ip_all –replSet=config1 –configsvr

./mongod –dbpath=/Users/prabhu/Documents/softwares/mongodb-osx-x86_64-4.0.6/bin/data/config3 –port=27020 –bind_ip_all –replSet=config1 –configsvr

rs.initiate({_id:”config1″,members:[{“_id”:1,”host”:”localhost:27018″}]})

rs.add(“localhost:27019”)

rs.add(“localhost:27020”)

Start Mongos with config cluster
./mongos –configdb=”config1/localhost:27018,localhost:27019,localhost:27020″ –port=27017 –bind_ip_all

Connect to Mongos Server
./mongod –port 27017

sh.addShard(“replica1/localhost27011”)

sh.addShard(“replica2/localhost27021”)

sh.addShard(“replica3/localhost27031”)

sharding Collection

sh.enableSharding(“shoppingdb”); // enable sharding for db

sh.shardCollection(“shoppingdb.Orders”,{_id:1},true); // shard the collection

There are lot of articles which talks about domain driven design, Event Driven and CQRS architectural practices. However,In this blog post, an effort to put domain driven design (DDD), Event Driven and Command Query Responsibility Segregation in a simple application which will explain all of above concepts. This application has been developed using spring boot, axon ,axon db server, java programming language, maven for build and eclipse etc.
In this application we are just trying to create an order with some order items (Command) and retrieve the same (Query) using order id. This is a very common scenario in any e commerce application and also a good example to explain above concepts.
Here is the out line of flow,

And here is the git hub url for code

https://github.com/prabhukvn/axon-springboot-poc.git