knktc's Notes

A practical guide for running two Elasticsearch instances on a single host by separating ports, paths, and per-instance config files.

If Kibana 3 cannot connect to Elasticsearch even though the port is open, the real issue may be missing CORS headers.

Two simple ways to avoid interactive password prompts when running pg_dump in scripts or cron jobs.

To use a custom UDF through HiveServer2 on CDH4, add the jar directory to both hive.aux.jars.path and HIVE_AUX_JARS_PATH.

Use Start-Job and a small polling loop to run a limited number of PowerShell tasks in parallel instead of one by one.

Since Docker containers do not let you manage /etc/hosts freely, running dnsmasq locally can provide custom host resolution instead.

Notes on installing the classic Docker Registry service on CentOS, wiring it through Nginx, and supervising it with supervisord.

A small collection of practical Docker notes, including stopping containers, detach behavior, timezone mapping, cron issues, and moving /var/lib/docker.

Use GPG with external public and secret keyring files so you can decrypt on another machine without importing your keys.

If lftp can log in over FTPS but file uploads fail with a 521 error, enable ftp:ssl-protect-data.