Compiling here some loose notes I have on macOS — adjustments I make every time I set up a new machine or need to apply again after an update. Cleaning up directory junk When you download a zip o...
SSH connections drop due to inactivity when there’s no packet exchange for a period of time. To prevent this, configure keepalive on the server: sudo vi /etc/ssh/sshd_config Add or edit the line...
Resque Series — part 3 of 3 Infra: starting, stopping, killing Diagnosis via console You are here — Mass manipulation Correlation with the Sidekiq series — this post is the m...
Resque Series — part 2 of 3 Infra: starting, stopping, killing You are here — Diagnosis via console Mass manipulation of jobs and workers Correlation with the Sidekiq series ...
Resque Series — part 1 of 3 You are here — Infra: starting, stopping, killing Diagnosis via console Mass manipulation of jobs and workers Why this series exists — I spent a l...
PostgreSQL series — part 2 of 2 Installation on Mac and common bugs You are here — Tuning and investigation via the SQL console With Postgres running and pg_stat_statements enabled...
PostgreSQL series — part 1 of 2 You are here — Installation on Mac and common bugs Tuning and investigation via the SQL console Running Postgres on Mac via Homebrew is trivial when...
When you have a folder full of files to process, a bash loop handles it without needing to open any GUI. Extract all .rar files from a directory for f in *.rar; do unrar e "$f"; done unrar e ex...
Bluetooth connects but audio doesn’t work, or the device doesn’t even show up in the sound options? You’re probably missing the PulseAudio module for Bluetooth: sudo pacman -Sy pulseaudio-bluetoot...
Writing a system image to an SD card or USB drive from the terminal is simpler than it looks — and faster than opening Etcher most of the time. Identify the correct disk Before anything else, ide...
Some commands I use so rarely that every time I need them I have to go look them up again. Noting them here so I don’t lose them. See who’s using a port lsof -n -i4TCP:8081 Replace 8081 with th...
“Connected to Wi-Fi but the internet isn’t working.” Classic situation. Here’s my diagnostic sequence — and a reference for all the networking commands I use frequently. Diagnostic sequence 1. Ch...
After updating the kernel or GRUB, it’s common for Windows to disappear from the boot list. os-prober fixes it — but it needs some extra configuration to work. Restoring Windows in GRUB 1. Enable...
When some hardware doesn’t work on Linux — Wi-Fi, Bluetooth, sound card — the problem almost always lies in the driver (kernel module). Here are the commands for diagnosing and intervening. Listin...
On Arch (and derivatives like Manjaro), pacman is the default package manager. Together with yay for the AUR, it covers pretty much everything. Here are the commands I use most. Listing packages ...
Sidekiq series — part 4 of 4 Infra: starting, stopping, killing Diagnosis via console Bulk manipulation of jobs and processes You are here — UI hacks in the dashboard Sideki...
Sidekiq series — part 3 of 4 Infra: starting, stopping, killing Diagnosis via console You are here — Bulk manipulation UI hacks in the dashboard After diagnosing (part 2), t...
Sidekiq series — part 2 of 4 Infra: starting, stopping, killing You are here — Diagnosis via console Bulk manipulation of jobs and processes UI hacks in the dashboard When s...
Sidekiq series — part 1 of 4 You are here — Infra: starting, stopping, killing Diagnosis via console Bulk manipulation of jobs and processes UI hacks in the dashboard Before...
Every time I start a new SaaS in Rails, I end up spending 30 minutes remembering the same flags. This post is my cheat sheet. The evolution of my rails new # v1 rails new app --database=postgresq...
A compilation of tricks I use in irb and rails console. Most are one-liners to investigate bugs, measure performance, or just make the terminal more pleasant. List IRB history puts Readline::HIST...
Every time I reinstalled the system or spun up a new VM, I’d lose a few hours reapplying configs. I solved that with a dotfiles repo built around a simple idea: one command, one ready system — as l...
Webhooks only work on a public server. But testing webhooks in a staging environment is tedious — ngrok solves this in seconds: it creates an HTTPS tunnel to your local port. Steps brew install n...
Working with VCR is great until you record a response that came with Content-Encoding: gzip and open the YAML to find incomprehensible bytes. The snippet below loads the cassette and prints the bod...
Brakeman is a static analyzer that catches classic Rails vulnerabilities: SQL injection, mass-assignment, XSS, open redirect. I prefer running it via Docker to avoid polluting the Gemfile with a sc...