security: 
 keyFile: /usr/local/mongodb/authentication/keyFile 
sharding: 
 clusterRole: shardsvr 
replication: 
 replSetName: rs3 
net: 
 port: 27023 
storage: 
 dbPath: /data/db_delay_rs3 
systemLog: 
 path: /data/log_delay_rs3/mongodb.log 
 destination: file 
 logAppend: true 
 logRotate: rename 
processManagement: 
 fork: true 

#!/bin/bash 
#Rotate the MongoDB logs to prevent a single logfile from consuming too much disk space. 
 
app=mongod 
 
mongodPath=/usr/local/mongodb/bin/ 
 
pidArray=$(pidof $mongodPath/$app) 
 
for pid in $pidArray;do 
if [ $pid ] 
then 
 kill -SIGUSR1 $pid 
fi 
done 
 
exit 

vi /etc/crontab

59 23 * * * root /data/logRotate/logRotate.sh 

mongodb.log  mongodb.log.2016-12-08T15-59-01 mongodb.log.2016-12-13T15-59-01
mongodb.log.2016-12-06T07-14-10 mongodb.log.2016-12-09T15-59-01 mongodb.log.2016-12-14T15-59-01
mongodb.log.2016-12-06T15-59-01 mongodb.log.2016-12-10T15-59-01 mongodb.log.2016-12-15T15-59-01
mongodb.log.2016-12-07T01-54-05 mongodb.log.2016-12-11T15-59-01 mongodb.log.2016-12-16T15-59-01
mongodb.log.2016-12-07T15-59-01 mongodb.log.2016-12-12T15-59-01