Tag: performance

Your Linux box takes forever to boot? systemd-analyze shows exactly which services drag it down. Read blame, critical-chain, plot, and fix the slow ones.

Master SSH ControlMaster, ControlPath, and ControlPersist. Reuse connections for lightning-fast SSH, SCP, and rsync operations.

Why Linux kills your app with no warning. Understand the OOM killer, read dmesg logs, and shield critical processes with oom_score_adj and swap.

Compare zram (compressed RAM) and traditional swap files. Learn when each works, setup, and real-world performance trade-offs for memory-constrained systems.

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.

Manage Linux process priority with nice (CPU) and ionice (I/O). Learn priority levels, renice running processes, and avoid tanking server performance.

The 1024 file descriptor limit stops servers under load. What fds are, soft vs hard limits, how to raise them properly, and how to diagnose exhaustion.

daemon.json controls how the Docker daemon behaves, logging drivers, storage drivers, registry mirrors, and the options worth tuning.

Speed up Ansible playbooks with pipelining, forks, fact caching, and async tasks, stop watching the spinning wheel on every play.

Squeeze more out of Proxmox VE, CPU pinning, memory ballooning, IO threads, virtio drivers, and storage tuning for faster VMs.

Out of RAM and no time to reimage? Add swap via a file on any partition using mkswap, swapon, and fstab, done in under 5 minutes.