MongoDB

Introduction

Purpose

References

Installation

• Install MongoDB 7 Community Edition on Red Hat or CentOS

• "Swappiness" is a Linux kernel setting that influences the behavior of the Virtual Memory manager.

  • ubuntu 22.04: 10
  • CentOS 10: 60
  • CentOS 7: 30

Get warnings and errors from the log file

• grep -v '"s":"I"' /var/log/mongodb/mongod.log

Creating the admin account

• mongosh
  • first time there is no challenge
• use admin
• db.createUser({"user": "myadmin", "pwd": "mysecret", "roles": ["root"]})
• exit

if you had accidentally removed the admin user

• vi /etc/mongod.conf
• comment out

#security:
#    authorization: "enabled"

• systemctl restart mongod
• now you can create a new root/admin user
• IMPORTANT - remember to re-enable and restart

Various commands

show databases
admin   132.00 KiB
config   60.00 KiB
local    40.00 KiB

db.createUser({
   "user": "gdhpsk",
   "pwd": "123456",
   "roles": ["root"]
})

db.auth("gdhpsk", "123456")

admin> db.createUser({
  user: "admin",
  pwd: "your-password",
  roles: [ { role: "root", db: "admin" } ]
})

use admin
db.system.users.find()

Delete user.

db.dropUser("gdhpsk")

db.adminCommand({ getCmdLineOpts: 1 })