Using MongoDB's findOneAndUpdate with Replica Set Awareness to Reduce Load on Primary DB

Prefixing findOneAndUpdate with a secondaryPreferred findOne to offload reads from the MongoDB primary.

Solution for No space left on device error ~ inode depletion edition

Tracking down a No space left on device error on Linux to inode depletion caused by wp-file-cache.

CDN Implementation Proposal

A CDN proposal covering the basics, trade-offs, and choosing between CloudFront and Fastly.

How to Remove WordPress Cache Plugin WP File Cache

How I deactivated and completely removed the WP File Cache plugin after it exhausted the server's inodes.

[Ionic] How to Clear Cache When Building for Android/iOS

How I recovered from Ionic + Cordova build failures by clearing the cache via platform remove / add.

PayPal RefundTransaction API cannot refund after 180 days from payment date

The PayPal RefundTransaction API cannot refund after 180 days — notes on workarounds with MassPay and DoNonReferencedCredit APIs.

Encounter with the Pomodoro Technique

How Rebuild.fm and the book SOFT SKILLS led me to finally try the Pomodoro Technique.

npm json2csv for converting JSON to CSV format is super convenient

A quick guide to converting JSON to CSV with npm json2csv, including sample code and why to avoid custom CSV.

How to specify TLS version with cURL

How to probe TLS 1.0 / 1.1 / 1.2 support individually using cURL's --tlsv1.x options.

Presented 'What We Practice for Continuous npm update' at We Are JavaScripters! @17th #wejs

My talk 'What We Practice for Continuous npm update' at the We Are JavaScripters! @17th meetup.

For Sakura Cloud and VPS CPU specifications, you have to check cpuinfo yourself

Sakura support won't share physical host CPU specs — you have to check /proc/cpuinfo yourself.

About AWS EC2 instance-specific network bandwidth and bandwidth guarantee

Measured per-instance EC2 network bandwidth references and confirmation that AWS does not guarantee it.

[npm] How to remove packages not in package.json from node_modules

A short memo on using npm prune to remove packages missing from package.json out of node_modules.

AWS EC2 instance selection meeting Wowza Streaming Engine minimum recommended specifications

Choosing AWS EC2 instance types that meet Wowza Streaming Engine's minimum recommended specifications.

[Nginx] Access restriction configuration to block specific IP addresses

Adding a deny directive inside a location block to block a specific IP address in Nginx.

[MongoDB] Query to find documents with specific ObjectId from all collections

A mongo shell snippet that scans every collection to locate a document when all you have is its ObjectId.

[JavaScript] Quick solution for URI malformed / malformed URI sequence errors

A quick try...catch workaround for the URIError raised by decodeURIComponent on invalid input.

[MongoDB] Index names can only be set up to a maximum of 127 bytes

Reproducing MongoDB's 127-byte index name limit with successful and failing createIndex calls.

[Git] Solution for fatal: unable to access: SSL certificate problem: Invalid certificate chain

A quick workaround for the Invalid certificate chain error by toggling `http.sslVerify`.

Solution for large /tmp/magick-xxx files created by ImageMagick and policy.xml configuration changes

Cleaning up massive /tmp/magick-xxx files and tuning ImageMagick's policy.xml resource limits.

[Linux] Commands to check CPU core count

How to check CPU core count and processor details on Linux with nproc, getconf, and /proc/cpuinfo.

Using cordova-plugin-safariviewcontroller with Ionic Framework

Sample code for opening external URLs with cordova-plugin-safariviewcontroller in Ionic Framework, with an InAppBrowser fallback.

[Ionic] How to use InAppBrowser to open URLs in default browser

Sample code for opening URLs in the device's default browser via Ionic's InAppBrowser using the '_system' target.

How to launch iOS apps in simulator with Ionic Framework

Build with ionic cordova build ios, open the .xcodeproj in Xcode, and run the app in the iOS Simulator.

Getting started with ionic start

The options I chose when creating an Ionic Framework project with ionic start — starter, Cordova, and Ionic Pro SDK.

Greenkeeper service that automatically runs npm update & creates pull requests is convenient

Setup notes for Greenkeeper, which opens automated npm update pull requests on your GitHub repositories.

Three benefits of implementing Always SSL (HTTPS) ~ Security, SEO, and reducing user distrust

Why sites should go HTTPS everywhere, summarized as three benefits: security, SEO, and reducing user distrust.

When using CDN, CNAME management with subdomain is better for SEO

For SEO, point a custom-domain subdomain at your CDN with a CNAME instead of using the raw CDN URL.

i18n Multilingual support management methods ~ Comparing advantages and disadvantages of Language files and Template files

Trade-offs of language-file versus per-language-template approaches for i18n multilingual support.

How to check CentOS support end-of-life dates

Where to look up the end-of-life date for each CentOS release.

WebRTC introductory books

Three introductory books I referenced when starting to work with WebRTC.

[MongoDB] Solution for exception: can't convert from BSON type EOO to Date

Guard $year/$month with $match and `$type: 9` to avoid the aggregate EOO to Date error.

[crontab] Solution for * is not found error

Troubleshooting notes on why cron scripts hit '* is not found' - the fix is setting PATH inside crontab.

Crash report service implementation proposal ~ Errbit, Sentry, Bugsnag, Airbrake

A proposal comparing Errbit, Sentry, Bugsnag, and Airbrake as crash report services by pricing and features.

Jenkins operation cost is wasteful, so we should use CI services

Why resource-constrained teams should pay for a managed CI service like CircleCI instead of self-hosting Jenkins.

Specify UserAgent with curl command

How to set the User-Agent header with curl's -H option, using the Facebook crawler as an example.

BigQuery query to specify timezone and search with WHERE clause

A BigQuery Standard SQL WHERE clause filtering a date range with an explicit timezone.

[GitHub] Search for issues and pull requests closed in a specific period

Search GitHub issues and pull requests closed in a specific period with the closed: range qualifier.

Register initial data from CSV files with rails db:seed

Manage rails db:seed initial data as per-model CSV files and run seeds per model.

Node.js sample code to convert to JSON array

A short Node.js snippet that converts a two-dimensional array into a JSON array.

[Nagios] Return code of 255 is out of bounds error occurs when NRPE is not running

Return code of 255 usually means NRPE isn't running on the monitored host — start it and enable auto-start.

2018 Goals and Policies

2018 goals and policies as a development lead and PM, plus what I've decided not to focus on.

Configuration to include log files in subdirectories with logrotate

Add a nested glob pattern to your logrotate config so logs under subdirectories get rotated too.

Changed logrotate generation count to delete old log files

Reduce logrotate's rotate count and manually remove the leftover old logs to reclaim server disk space.

[JavaScript] Rewrite a href URLs based on the currently accessed domain

JavaScript sample that inspects document.domain and rewrites an a href URL only on the test environment.

[Node.js] url-join that nicely combines URLs is convenient

Using url-join to combine URL fragments while handling duplicate slashes and query parameters cleanly.

[PayPal] Transaction cannot complete. error cause is unknown even to PayPal employees, so you have to contact credit card companies or banks

PayPal API Error 10417 Transaction cannot complete. — even PayPal cannot pinpoint the cause, so customers must contact their card issuer or bank.

Tested whether it's safe to delete Google Workspace groups that contain group email addresses

Testing whether deleting a nested child group is also cleanly removed from its parent group.

Started a Tech Podcast for engineer recruitment purposes

Why I started an in-house Tech Podcast as an engineer-hiring channel, and how it compares to blogs and scouts.

How to write shell scripts that execute batch jobs with crontab only at month-end

Use the test command to check if tomorrow is the 1st, so cron fires only on the actual month-end day.