error:
rico@ubuntu:/var/lib/mongodb$ sudo service mongodb start
Failed to start mongodb.service: Unit mongodb.service is masked.
Solution:
rico@ubuntu:/var/lib/mongodb$ sudo chown -R mongodb:mongodb /var/lib/mongodb
rico@ubuntu:/var/lib/mongodb$ sudo systemctl start mongod
error:
rico@ubuntu:~$ mongo
MongoDB shell version: 3.2.17
connecting to: test
2017-11-16T23:48:59.362+0800 W NETWORK [thread1] Failed to connect to 127.0.0.1:27017, in(checking socket for error after poll), reason: errno:111 Connection refused
2017-11-16T23:48:59.362+0800 E QUERY [thread1] Error: couldn’t connect to server 127.0.0.1:27017, connection attempt failed :
connect@src/mongo/shell/mongo.js:229:14
@(connect):1:6
exception: connect failed
Solution:
sudo rm /var/lib/mongodb/mongod.lock
sudo mongod --repair --dbpath /var/lib/mongodb
sudo mongod --fork --logpath /var/lib/mongodb/mongodb.log --dbpath /var/lib/mongodb
sudo service mongodb start
Question:
Implementation db.auth (‘username ‘,’ password ‘),
monodb authentication failed,
error: authentication failed. appears
environment
Root, admin, and business database user authentication failed
Solution
##Go to the bin directory
cd
##stop
mongod --shutdown --dbpath=/soft/mongo/mgserver/data/
##start
./mongod --dbpath=/soft/mongo/mgserver/data/ --logpath=/soft/mongo/mgserver/logs/mongod.log --logappend --port=27017 --fork
verify
mongo
show dbs
use ${your db}
show users
use admin
show users
Modify password
3.1 modify root password:
#
mongo
#
db.changeUserPassword('root','${new password}')
#
exit
#closed
mongod --shutdown --dbpath=/soft/mongo/mgserver/data/
#Certification Launch
./mongod --dbpath=/soft/mongo/mgserver/data/ --logpath=/soft/mongo/mgserver/logs/mongod.log --auth --logappend --port=27017 --fork
#
mongo
#
use admin
#user, pwd
db.auth('','')
Similarly, change the password of other users
3.2 new users
#
mongo
#
use ${your db}
#
db.createUser({
user: "",
pwd:"",
roles:[{role:"readWrite",db:""}]
})