notes/MongoDB_Notes.txt at master · pataraco/notes · GitHub

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-------------
MongoDB Notes
-------------

files
-----
/etc/mongod.conf   # config file
   logpath = /var/log/mongo/mongod.log
   dbpath = /var/lib/mongo
   sslPEMKeyFile = /data/mongo/ssl/mongodb.pem

/var/log/mongo/mongod.log   # log file - defined by 'logpath' in config

services
--------
$ service mongod status|stop|start

commands
--------
# To start a mongod instance in master mode, invoke mongod as follows:
mongod --master --dbpath /data/masterdb/
# To start a mongod instance in slave mode, invoke mongod as follows:
mongod --slave --source <masterhostname><:<port>> --dbpath /data/slavedb/

# enter the shell (from one of the servers)
mongo --ssl --sslAllowInvalidCertificates --host mongo1
# and show master/slaves info
vmrs0:SECONDARY> db.runCommand("ismaster")
{
        "setName" : "vmrs0",
        "setVersion" : 3,
        "ismaster" : false,
        "secondary" : true,
        "hosts" : [
                "mongo1:27017",
                "mongo2:27017",
                "mongo3:27017"
        ],
        "primary" : "mongo3:27017",				# <-------- lists primary/master
        "me" : "mongo1:27017",
        "maxBsonObjectSize" : 16777216,
        "maxMessageSizeBytes" : 48000000,
        "maxWriteBatchSize" : 1000,
        "localTime" : ISODate("2017-11-15T09:15:50.340Z"),	# <---- causes `jq`|`from_json` to FAIL
        "maxWireVersion" : 3,
        "minWireVersion" : 0,
        "ok" : 1
}
vmrs0:SECONDARY>

# try running CLI
mongo test --eval "printjson(db.getCollectionNames())" # example

mongo --quiet --ssl --sslAllowInvalidCertificates --host mongo2 --eval "printjson(db.runCommand('ismaster'))"


tags: MongoDB, mongo