Master and slave synchronization configuration in MongoDB and launch commands related to mongod

MongoDB master slave synchronization Settings
For the installation and startup parameters of MongoDB, please refer to the "Ubuntu installation MongoDB" and "Mongodb startup command mongod parameters" I reprinted before.

Master-slave setup

Master :  192.168.111.103 Port : 8001
Slave : 192.168.111.104 Port : 8001

Start the Master

mongod --dbpath /data/masterdb/ --master --oplogSize 64 --port 8001 --fork --logpath /var/logs/mongodb/mongod.log 

Start the Slave

 

mongod --dbpath /data/slavedb/ --slave --source 192.168.111.103:8001 --oplogSize 64 --port 8001 --fork --logpath /var/logs/mongodb/mongod.log 

Looking at Slave log, you can see that the data has been copied from Master

tail -f /var/logs/mongodb/mongod.log 
Thu Feb 27 22:18:20 repl: main@192.168.111.103:8001 
Thu Feb 27 22:18:20 repl: sleep 2sec before next pass 
Thu Feb 27 22:18:22 repl: main@192.168.111.103:8001 
Thu Feb 27 22:18:22 repl: sleep 2sec before next pass 
Thu Feb 27 22:18:24 repl: main@192.168.111.103:8001 
Thu Feb 27 22:18:24 repl: sleep 2sec before next pass 
Thu Feb 27 22:18:26 repl: main@192.168.111.103:8001 
Thu Feb 27 22:18:26 repl: sleep 2sec before next pass 
Thu Feb 27 22:18:28 repl: main@192.168.111.103:8001 
Thu Feb 27 22:18:28 repl: sleep 2sec before next pass 
Thu Feb 27 22:18:30 repl: main@192.168.111.103:8001 
Thu Feb 27 22:18:30 repl: sleep 2sec before next pass 
Thu Feb 27 22:18:32 repl: main@192.168.111.103:8001 
Thu Feb 27 22:18:32 repl: sleep 2sec before next pass 

Stop using MongoDB

mongo -port 8001 
use admin 
db.shutdownServer() 
exit 

Repair MongoDB

mongod --dbpath /data/masterdb/ repair 
mongod --dbpath /data/slavedb/ repair 

Mongodb launch command mongod parameter description

The main parameters of mongod are:

The basic configuration

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--quiet # quiet output
--port arg # specifies the service port number, with the default port 27017
--bind_ip arg # binding service IP. If bound 127.0.0.1, it can only be accessed locally, and all IP are not specified by default
--logpath arg # specifies the MongoDB log file. Note that the specified file is not a directory
--logappend # logs with appends
-- the full path to pidfilepath arg # PID File, if not set, no PID file
-- the full path of the private key of the keyFile arg # cluster, only valid for the Replica Set architecture
--unixSocketPrefix arg # UNIX domain socket substitution directory,(default /tmp)
--fork # runs MongoDB as a daemon, creating a server process
--auth # enables validation
--cpu # shows CPU's CPU utilization and iowait periodically
--dbpath arg # specifies the database path
--diaglog arg # diaglog option 0=off 1=W 2=R 3=both 7=W+some reads
--directoryperdb # sets that each database will be saved in a separate directory
-- with the logging option enabled, the data operations of MongoDB will be written to files in the journal folder
--journalOptions arg # enables log diagnostics
--ipv6 # enables the IPv6 option
--jsonp # allows the JSONP form to be accessed via HTTP (with security implications)
-- the maximum number of simultaneous connections maxConns arg # defaults to 2000
--noauth # does not enable validation
--nohttpinterface # closes http interface, and port 27018 is closed by default
--noprealloc # disables preallocation of data files (often affecting performance)
--noscripting # disable the scripting engine
--notablescan # does not allow table scans
--nounixsocket # disables Unix socket listening
--nssize arg (=16) # set the letter database.ns file size (MB)
--objcheck # after receiving customer data, check the validity,
--profile arg # file parameter 0=off 1=slow, 2=all
--quota # limits the number of files per database and sets the default to 8
--quotaFiles arg # number of files allower per db, requires --quota
--rest # opens simple rest API
--repair # fixes all databases run repair on all dbs
--repairpath arg # fixes the directory of files generated by the library, with the default directory name dbpath
--slowms arg (=100) # value of slow for profile and console log
--smallfiles # USES a smaller default file
--syncdelay arg (=60) # number of seconds to write data to disk (0=never, not recommended)
--sysinfo # prints 1 diagnostic system information
--upgrade # if you need to upgrade the database * Replicaton parameter

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--fastsync # enables the slave library replication service from an dbpath database that is a snapshot of the master library and can be used to quickly enable synchronization
--autoresync # if the slave library is much worse than the master, automatically resynchronize,
--oplogSize arg # sets the size of oplog (MB) * as the master/slave parameter

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--master # main library mode
--slave # slave mode
--source arg # slave library port number
--only arg # specifies the database replication for single 1
--slavedelay arg # sets the delay time for synchronizing the master from the library * Replica set(replica set) option:

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--replSet arg # sets the replica set name * Sharding(sharding) option

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--configsvr # declares that this is the config service for 1 cluster, default port 27019, default directory /data/configdb
--shardsvr # declares that this is a sharding of 1 cluster, with the default port 27018
--noMoveParanoia # turns off bigotry for moveChunk data saving
The above parameters can be written into the mongod.conf configuration document, for example:

dbpath = /data/mongodb
logpath = /data/mongodb/mongodb.log
logappend = true
port = 27017
fork = true
auth = true

e. g:

./mongod -shardsvr -replSet shard1 -port 16161 -dbpath /data/mongodb/data/shard1a -oplogSize 100 -logpath /data/mongodb/logs/shard1a.log -logappend -fork -rest