📦 Installation Command
apt install docker.io docker-compose-v2 (or use official Docker repo for latest)
Docker Default Ports Reference
docker systemctl: dockerContainer platform. Build, run, and manage containerized applications.
🔌 Default Ports
2375
tcp
Docker API (unencrypted - NEVER EXPOSE)
2376
tcp
Docker API (TLS)
Dynamic
tcp
Container ports as configured
⚙️ Configuration Files
/etc/docker/daemon.json/etc/default/docker~/.docker/config.json
📂 Default Directories
- config:
/etc/docker - data:
/var/lib/docker - logs:
/var/log/docker.log (or journald) - socket:
/var/run/docker.sock
🔐 Default Credentials
Username:N/A
Password:N/A
💡 Access via docker group membership or root. docker.sock access = root access!
📌 Dependencies
⚠️ Conflicts
✅ Works With
🛡️ Security Notes
NEVER expose Docker socket/API to network, use rootless mode, scan images, use Docker Content Trust, limit container resources
❓ Frequently Asked Questions
What is Docker default port?
Docker API uses port 2375 (unencrypted) or 2376 (TLS encrypted).
What port does Docker Registry use?
Docker Registry uses port 5000 by default.
Docker Swarm ports?
Swarm uses 2377 (cluster management), 7946 (node communication), 4789 (overlay network).