Technical guide
Write a .gitignore for a Visual Studio project
Ignore Visual Studio build output and user state while keeping solution files, project definitions, and intentional shared editor configuration.
Technical guide
Allow Guance synthetic monitoring through a cloud firewall
Use verified probe source addresses, protocols, and ports to allow synthetic checks through DigitalOcean Cloud Firewalls and diagnose remaining failures.
Explainer
Customize Gunicorn access logs
Choose Gunicorn access-log fields, include request duration, and understand why a JSON-shaped format string is not a JSON serializer.
Explainer
What do #012 and #015 mean in rsyslog?
Identify rsyslog’s octal escapes for LF and CR, normalize a selected output, and avoid confusing literal escape text with control characters.
Explainer
Troubleshoot HAProxy logs missing from rsyslog
Trace HAProxy’s logging destination, rsyslog input, chroot socket, facility routing, and transport-specific tests.
Technical guide
Reset a single Git file to HEAD
Restore one file in both the index and working tree, distinguish that from unstaging, and understand what Git can recover after an accidental overwrite.
Explainer
Send Nginx access and error logs to stdout and stderr
Configure Nginx standard-stream logging for containers, preserve startup errors, and let the runtime manage log retention.
Technical guide
Understand HEAD^ and HEAD~ in Git
Use caret notation to choose a parent and tilde notation to follow the first-parent chain, including merge histories and revision ranges.
Explainer
Group Prometheus query results by label
Use by and without for label aggregation, keep counter reset handling intact, and avoid misleading averages.
Explainer
Export only the schema from PostgreSQL
Use pg_dump to export PostgreSQL definitions without table data, select tables or schemas, and restore the result into another database.
Explainer
Find Graylog messages by log level
Filter Graylog messages by syslog severity, combine levels with source filters, and check whether your pipeline stores numeric or textual levels.
Technical guide
Generate a Git patch for a specific commit
Export a commit with format-patch, apply it with git am, or create a raw diff; understand metadata, binary files, and conflict handling.