Tag: networking

Fix SSH timeouts: ServerAliveInterval, ServerAliveCountMax, ClientAliveInterval. Understand NAT, firewalls, and TCP keepalive.

ss replaces netstat on modern Linux: faster, shows more socket detail, and reads from the kernel. Every netstat command you rely on, rewritten for ss.

Network aliases give a container more than one DNS name on a Docker network. Blue-green and canary deploy patterns, a Compose example, and the limits.

lsof shows every open file, socket, and port on the box. Find what holds a port, trace deleted files still eating disk, and see what a service owns.

Something's squatting on port 8080 and you need to know what. ss, netstat, and lsof one-liners to find the PID behind a port fast.

AV vs EDR, traditional antivirus signatures vs behavioral endpoint detection. What each catches, what it misses, and what you actually need.

Certificate pinning locks your app to a specific TLS cert so MITM attackers can't swap in a rogue CA, how it works and when to use it.

Bridge, host, overlay, macvlan, and none, every Docker network mode explained with real use cases from beginner to production.

Add load balancing and failover to your Docker setup using Swarm, nginx, HAProxy, and Keepalived, high availability without Kubernetes.

Access services on the host machine from inside a Docker container using host-gateway or host.docker.internal, no hardcoded IPs.

Automate a full WordPress stack deployment, Docker, nginx, and MySQL, using Ansible playbooks instead of clicking through wizards.

Cloudflare Tunnels expose local services to the internet without open ports, secure setup with zero-trust access controls.