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infrastructure/databases/mongodb/SKILL.md

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+---
+name: mongodb
+description: Administer MongoDB databases. Configure replica sets, sharding, and backups. Use when managing MongoDB deployments.
+license: MIT
+metadata:
+  author: devops-skills
+  version: "1.0"
+---
+
+# MongoDB
+
+Administer MongoDB NoSQL databases.
+
+## Installation & Setup
+
+```bash
+# 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
+
+```javascript
+// 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
+
+```javascript
+// Initialize replica set
+rs.initiate({
+  _id: "myReplicaSet",
+  members: [
+    { _id: 0, host: "mongo1:27017" },
+    { _id: 1, host: "mongo2:27017" },
+    { _id: 2, host: "mongo3:27017" }
+  ]
+})
+```
+
+## Backup
+
+```bash
+# Backup
+mongodump --out /backup/
+
+# Restore
+mongorestore /backup/
+```
+
+## Best Practices
+
+- Use replica sets in production
+- Implement proper indexing
+- Enable authentication
+- Regular backups with mongodump