配置文件内容：
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cat /etc/MongoDB.conf
storage:
dbPath: "/data/databases/mongodb"
directoryPerDB: true
journal:
enabled: true
wiredTiger:
engineConfig:
cacheSizeGB: 100
systemLog:
destination: file
path: "/data/databases/mongodb/mongodb.log"
logRotate: rename
logAppend: true
timeStampFormat: iso8601-local
operationProfiling:
slowOpThresholdMs: 200
mode: slowOp
replication:
oplogSizeMB: 51200
replSetName: "rschunqiu"
processManagement:
fork: true
net:
bindIp: 0.0.0.0
port: 27017
security:
keyFile: "/data/databases/mongodb/mongodb-keyfile"
authorization: "enabled"
启动mongodb：
/usr/local/mongodb/bin/mongod --config /etc/mongodb.conf