Subject: [mongodb-user] Re: MongoDB 3.4 Sharded Cluster



Hi Jacek or anyone who also may help,
The Mongo 3.4 Shard setup is different compared to previous versions from what I understand.  Here are the instructions that I am supposed to perform: 

Stop the mongod process. Now, restart the mongod process adding the option --shardsvr. If you started mongod with a --dbpath option, specify that as well.

mongod --shardsvr ...

Note that with --shardsvr specified the default port for mongod becomes 27018.


Start a mongo config server:

mongod --configsvr ...


Note: configuration server setup has changed. If you are using MongoDB 3.4 you must set up your configuration servers with CSRS. An example setup is as follows:


mongod --configsvr --replSet csReplSet ...
mongod --configsvr --replSet csReplSet ...
mongod --configsvr --replSet csReplSet ...

mongo --port 27019

config = { _id: "csReplSet", members:[
         { _id : 0, host : "localhost:27019" },
         { _id : 1, host : "localhost:27020" },
         { _id : 2, host : "localhost:27021" }]};
rs.initiate(config)


(Note with --configsvr specified the default port for listening becomes 27019 and the default data directory /data/configdb. Wherever your data directory is, it is suggested that you verify that the directory is empty before you begin.)


Start a mongos:

mongos --configdb your_host_name:27019


These are the steps I tried from what I have gathered so far: 
mongod --shardsvr --replSet a --dbpath a0 --logpath log.a0 --port 27000 --fork --logappend --smallfiles --oplogSize 50
mongod --shardsvr --replSet a --dbpath a1 --logpath log.a1 --port 27001 --fork --logappend --smallfiles --oplogSize 50
mongod --shardsvr --replSet a --dbpath a2 --logpath log.a2 --port 27002 --fork --logappend --smallfiles --oplogSize 50

mongod --configsvr --replSet a --dbpath cfg0 --port 26050 --fork --logpath log.cfg0 --logappend
mongod --configsvr --replSet a --dbpath cfg1 --port 26051 --fork --logpath log.cfg1 --logappend
mongod --configsvr --replSet a --dbpath cfg2 --port 26052 --fork --logpath log.cfg2 --logappend

mongos --configdb m034:26050,m034:26051,m034:26052 --fork --logappend --logpath log.mongos0

It looks like I'm missing the step where it says if you're using Mongo 3.4, you must set up you configuration servers with CSRS.  What steps am I missing in order to get it to work?  Please help me fill in the missing steps.  Thanks.



On Wednesday, August 9, 2017 at 12:19:45 PM UTC-10, Alan wrote:Can someone show me simple step by step instructions of how to setup a MongoDB sharded cluster in Mongo 3.4.  From what I understand, Mongo 3.4 has a different way of setting it up compared to previous versions.  So far I tried the following but it doesn't seem to work.

mongod --configsvr --dbpath cfg0 --port 26050 --fork --logpath log.cfg0 --logappend
mongod --configsvr --dbpath cfg1 --port 26051 --fork --logpath log.cfg1 --logappend
mongod --shardsvr --replSet a --dbpath a0 --logpath log.a0 --port 27000 --fork --logappend --smallfiles --oplogSize 50
mongod --shardsvr --replSet a --dbpath a1 --logpath log.a1 --port 27001 --fork --logappend --smallfiles --oplogSize 50
mongos --configdb m034:26050,m034:26051,m034:26052 --fork --logapend --logpath log.mongos0
FailedToParse: mirrored config server connections are not supported; for config server replica sets be sure to use the replica set connection string
try 'mongos --help' for more information

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