Mongodb Basic Direction Command- Exercise Db, Exercise User, Assign Permission, Restrain Access

MongoDB:

MongoDB is an open-source document database that provides high performance, high availability, as well as automatic scaling. MongoDB obviates the involve for an Object Relational Mapping (ORM) to facilitate development.

• Basic MongoDB admin related commands:

1- Check MongoDB server version:
Run below ascendance mongo to banking company gibe mongodb version

root@US16: # mongo MongoDB crunch version v3.6.0 connecting to: mongodb://127.0.0.1:27017 MongoDB server version: 3.6.0 

2-List all the database: To listing all the DBs hitting ascendance show dbs;

> show dbs; admin   0.000GB config  0.000GB local   0.000GB > 

3-Enable MongoDB authentication:
By default, mongodb installation convey opened upwards access to the shell. that hateful anyone tin forcefulness out run the ascendance as well as modify the dbs.

Let's enable authentication : Follow the steps below

3A-Create a user amongst total privileges: Run the next command 

use admin db.createUser({user:"admin", pwd:"redhat", roles:[{role:"root", db:"admin"}]})

Command output would hold upwards similar this:

Now leave of absence from the mongo shell- type ascendance exit

3B- Stop mongod service

root@US16: # systemctl halt mongod.service

3C-Modify /lib/systemd/system/mongod.service :

root@US16: # vi /lib/systemd/system/mongod.service

Append --quiet --auth syntax inwards trouble starting fourth dimension with 

ExecStart=/usr/bin/mongod --quiet --auth --config /etc/mongod.conf

[Service] User=mongodb Group=mongodb ExecStart=/usr/bin/mongod --quiet --auth --config /etc/mongod.conf # file size LimitFSIZE=infinity 

Your ExecStart trouble should hold upwards like 

Save as well as Exit from the file

4- Reload service daemon: Run the ascendance below

root@US16: # systemctl daemon-reload

5- Start mongo service:Run the ascendance below

root@US16: # systemctl starting fourth dimension mongod.service

6- Check mongo service status: We involve to validate mongo service afterward applied the changes let's banking company gibe mongo service condition using below command.

root@US16: # systemctl condition mongod.service

7- Everything hold off adept as well as mongo service is dorsum authentication has enabled, allow validate access.

7A- Access mongo crunch amongst authentication 

root@US16: # mongo -u root -p

We are successfully able to login amongst username as well as password!

8- List all users: Login to mongo crunch amongst admin user
select database admin

> utilisation admin

Execute the next ascendance show users; to listing users

> demo users; {         "_id" : "test.admin",         "user" : "admin",         "db" : "test",         "roles" : [                 {                         "role" : "root",                         "db" : "admin"                 }         ] } {         "_id" : "test.amar",         "user" : "amar",         "db" : "test",         "roles" : [                 {                         "role" : "root",                         "db" : "admin"                 }         ] } >  

In the higher upwards out at that spot are 2 user available highlighted inwards cerise color 

9- Check electrical flow selected database:

To banking company gibe electrical flow choose database utilisation ascendance db

> db admin > 

10- Check electrical flow selected database's collection:

 To banking company gibe electrical flow choose database's collection utilisation ascendance show collections

> demo collections system.users system.version > 

11- Update password for existing user:

Use the next ascendance to update existing user's password

> utilisation admin switched to db admin > db.changeUserPassword("amar", "newpassword") > 

Where "use admin" ascendance to choose database as well as db.changeUserPassword("username","Newpassword")

Sumber https://linuxhowtoguide.blogspot.com/