Technical guide
Merge two independent Git repositories
Join unrelated histories at the repository root, import a project into a subdirectory, or rewrite its paths before combining histories.
Technical guide
Migrate an SVN repository to Git with history
Plan an SVN-to-Git conversion with author mapping, explicit branch and tag handling, validation, and a controlled final cutover.
Explainer
Change fields in Fluentd JSON output
Use record_transformer to add, change, and remove fields, then serialize records as JSON while preserving types and handling missing values.
Technical guide
Understand module.exports and exports in Node.js
Learn why property assignments through exports work, why reassigning exports does not replace a module, and how CommonJS consumers receive exports.
Explainer
Collect logs from a directory with Fluentd
Configure Fluentd in_tail wildcards, persistent offsets, file discovery, and rotation handling for logs spread across a directory tree.
Explainer
Monitor custom Kubernetes Pod metrics with Prometheus
Expose a metrics endpoint, select it explicitly through discovery or PodMonitor, and verify permissions, target selection, and ingestion.
Explainer
Monitor disk usage in Kubernetes persistent volumes
Use kubelet volume statistics to measure PVC capacity, set usage alerts, and investigate missing metrics or inode exhaustion.
Technical guide
Use multiple CPU cores in Node.js
Choose processes for HTTP capacity or worker threads for CPU-bound JavaScript, and size concurrency to the workload and deployment limits.
Technical guide
Serve multiple HTTPS domains on one IP address
Configure SNI virtual hosts in Nginx or Apache, verify each hostname’s certificate, and handle unmatched names and clients without SNI.
Technical guide
Must a CSR be generated on the server that uses the certificate?
A CSR can be created elsewhere if the matching private key stays controlled. Compare local generation, centralized issuance, and nonexportable HSM keys.
Explainer
Fix MySQL “No space left on device” errors
Find the filesystem behind MySQL error 28, recover space without deleting database files, and address logs, temporary files, or growing tablespaces.
Technical guide
Fix NET::ERR_CERT_COMMON_NAME_INVALID
Match the requested hostname to certificate SAN entries, then check DNS, SNI, redirects, and every TLS endpoint serving the site.