Posts
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Essential Linux Commands for Daily Use
The Linux commands every sysadmin reaches for daily, file ops, process management, networking, and text manipulation you can't live without.
· Updated:18 min read -
"Packages Have Been Kept Back": What It Means
Apt says packages have been kept back during upgrade. What the message means on Debian 12 and Ubuntu, why it happens, and how to install those packages safely.
· Updated:7 min read -
APT: Upgrade a Single Package, Not Everything
Upgrade one package with apt and leave the rest alone. The exact flag, why apt upgrade nginx upgrades everything, version pinning, and held package behaviour.
· Updated:6 min read -
Certificate Pinning: A Secure Connection Guide
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.
· Updated:8 min read -
Docker Networking Essential Guide for All Skill Levels
Bridge, host, overlay, macvlan, and none, every Docker network mode explained with real use cases from beginner to production.
· Updated:8 min read -
Docker Volume Mounts: Essential Flags
The -v and --mount flags for Docker volumes explained, bind mounts vs named volumes, read-only, propagation, and tmpfs options.
· Updated:7 min read -
How to Transfer docker Images Without a Repository
Move Docker images between hosts without a registry using docker save and docker load, air-gapped deployments made simple.
· Updated:6 min read -
Copying Files Between Docker Containers and Host Machines
Use docker cp to move files between running containers and your host machine, no volumes needed for one-off file transfers.
· Updated:7 min read -
Dockerfile: Differences Between COPY and ADD
COPY and ADD look similar but ADD auto-extracts tarballs and fetches URLs, know when each is appropriate and why COPY is usually better.
· Updated:6 min read -
Docker Strategies for Load Balancing and Failover
Add load balancing and failover to your Docker setup using Swarm, nginx, HAProxy, and Keepalived, high availability without Kubernetes.
· Updated:7 min read -
Docker Networking: Connecting to the Host from a Container
Access services on the host machine from inside a Docker container using host-gateway or host.docker.internal, no hardcoded IPs.
· Updated:7 min read -
Understanding Docker vs. Full Virtual Machines (VMs)
Containers share the kernel; VMs have their own. Understand the isolation trade-offs, overhead differences, and when to use which.
· Updated:7 min read
