Deploy a replica Set via mongodb.conf

[Tim]

Hello,

I deployed a replica set (later a sharding set) due to the shell commands like it is descriped in:
http://docs.mongodb.org/manual/tutorial/deploy-replica-set/

I would like to store all that information I inserted manually in the mongodb.conf -

I have 5 Server. Lets say: s2,s3,s4,s5 and s6
with:

s2: mongos - / config server where "sharding is running"

s3: 1 master process replicaset1  ; 1 arbiter for replicaset 2
s4: 1 slave process replicaset1


s5: 1 master process replicaset2  ; 1 arbiter for replicaset 1
s6: 1 slave process replicaset2

Later, there shall be a sharding set that consist of replicaset1 and replicaset2.

Question: How to modify the mongodb.conf (or multiple mongodb.conf???) in order to get such a use case?

(I think I have to define multiple processes, different ports, different folders to store information,.... - like the manually way...)

best regards,
tim

[Gianfranco]

The same command line options can be set on the a mongodb.conf file.

Here are the specific commands fore replication:

http://docs.mongodb.org/manual/reference/configuration-options/#replication-options

[Tim]

Hi,
thanks, I didn't find that articel -

so I have to create one config file per mongod/mongos process ( e.g. I have two processes I need two seperated files)

How do I declare an arbiter?

best regards

[Tim]

I do have to declare if an instance is master or slave ("prim./sec.") (for replicaset), don't I?

In which order do I have to execute the config file?

Manually I would started the master node ("primary") and the do something like:

cfg = { _id: "replica1", members :[ {_id : 0, host: "host_x" }, { _id : 1, host : "host_y"}, { _id : 2, host : "host_z:port_z", arbiterOnly : true } ] }
rs.initiate(cfg)

rs.add("host_y");
rs.addArb("host_z:_port_z");


best regards

[Tim]

edit:
my current conf file looks like:
port = 27017
fork = true
dbpath = /data/db/  
replSet = replica1

I'm missing that command that tells the prim node on which host/port to get the replica members

Am Dienstag, 30. Oktober 2012 15:49:45 UTC+1 schrieb Tim:

[Octavian Covalschi]

Not long time ago I have followed these instructions and all worked out fine

http://docs.mongodb.org/manual/tutorial/deploy-replica-set/

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[Gianfranco]

@Tim

If you read the first parts of the Replication Fundamentals until Consistency,

you'll understand the different from a traditional master-slave replication and the election procedure which makes sure one (an only one) of the members is Primary at any given time.

This is done thanks to the arbitrary as well.

[Tim]

Hello,

I know about the theoretical background concerning replicasets and sharding sets - moreover I deployed a sharding set manually. But now I want to source as much as possible out (@ the conf file).
By the conf.file consists of following commands:

port = 27017

fork = true
dbpath = /data/db/
replSet = replica1

noauth = true
nssize = 16

Do I have to execute commands like

rs.initiate()

rs.add("host.port")

rs.addArb("host:port")

still manually or can I source them out into a configfile in order to automate the process?


best regards

Am Dienstag, 30. Oktober 2012 15:49:45 UTC+1 schrieb Tim:

[Gianfranco]

Those commands only need to be run once.

Though if you want completely automate the process you can run a javascript file (.js) from the mongo shell (mongo) with those commands. 

> mongo --eval file.js

[Tim]

okay, thank you ;)
I've got it :>

Am Dienstag, 30. Oktober 2012 15:49:45 UTC+1 schrieb Tim: