Posts
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Docker Network Aliases: The Feature Nobody Uses
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.
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/proc as a Debugging Tool
The /proc filesystem is a live window into every running process on Linux. Debug PIDs, file descriptors, memory, and limits with no extra tools installed.
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Docker Healthcheck Patterns That Actually Work
Master Docker HEALTHCHECK syntax. Learn what checks work, how to tune interval/timeout/retries, and integrate with orchestration.
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zram vs Swap: What's Actually Faster for Low-RAM Servers
Compare zram (compressed RAM) and traditional swap files. Learn when each works, setup, and real-world performance trade-offs for memory-constrained systems.
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Running Docker Containers as Non-Root (And Why You Should)
Containers run as root by default, which is a real security problem. The USER instruction, numeric UID/GID, the volume mount gotcha, and distroless bases.
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strace for Beginners: See What Any Process Is Doing
Use strace to trace system calls and debug mysterious permission errors, missing files, and network issues without ever reading source code.
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Docker Container Labels: The Metadata You're Ignoring
Docker labels are free metadata for filtering, routing, and documentation. Learn label conventions and leverage them with filters and tools.
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Using the Clipboard from the Linux Terminal
Copy and paste from the Linux terminal without a mouse. Master xclip, xsel, wl-copy, and integrate clipboard with tmux and SSH.
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Why Docker Builds Are Slow: Layer Cache Explained
Docker layer caching explains most slow builds. Why copying files too early kills the cache, the layer ordering that fixes it, and a multi-stage benchmark.
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lsof: The Tool That Shows You Everything
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.
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Docker Exit Codes: Why Your Container Keeps Restarting
Decode Docker exit codes: 0 (success), 1 (app error), 125/126/127 (Docker errors), 137 (OOM), 143 (SIGTERM). Debug restarts in minutes.
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CPU and I/O Priority with nice and ionice
Manage Linux process priority with nice (CPU) and ionice (I/O). Learn priority levels, renice running processes, and avoid tanking server performance.
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