majiayu000 MongoDB
Administer MongoDB NoSQL databases.
Installation & Setup
# Install
apt install mongodb-org
# Start service
systemctl start mongod
# Connect
mongosh
# Create user
use admin
db.createUser({
user: "admin",
pwd: "secret",
roles: ["root"]
})
Basic Operations
// Create database and collection
use mydb
db.users.insertOne({ name: "John", email: "john@example.com" })
// Query
db.users.find({ name: "John" })
db.users.find().sort({ name: 1 }).limit(10)
// Index
db.users.createIndex({ email: 1 }, { unique: true })
Replica Set
// Initialize replica set
rs.initiate({
_id: "myReplicaSet",
members: [
{ _id: 0, host: "mongo1:27017" },
{ _id: 1, host: "mongo2:27017" },
{ _id: 2, host: "mongo3:27017" }
]
})
Backup
# Backup
mongodump --out /backup/
# Restore
mongorestore /backup/
Best Practices
- Use replica sets in production
- Implement proper indexing
- Enable authentication
- Regular backups with mongodump