Howard Lee Cloud

軟體工程 Docker + Docker-compose 建立 Rails app 的開發與正式環境經驗分享

By Howard Lee 18 September 2018

緣起我喜歡做 Rails app prototype 放在 Digital Ocean，Rails app A 5.2.0 已經部署在上面，最近想再部署其他小型 Rails app 到同一臺機器上，但發現部署其他小型 Rails app B 到相同正

軟體工程 Postgres WAL 概述

By Howard Lee 10 May 2018

PostgreSQL version 10 WAL 設定概述參數： checkpoint_timeout default is 5 minute max_wal_size default is 1GB archive_timeout full_page_writes checkpoint_warning checkpoint_completion_target default is 0.5 and only be fraction of checkpoint_timeout pg_test_fsync can measure average speed in microsecond of single WAL flush operation. Half of its value is effective for reporting average time setting that it flush single 8KB write operation to commit_delay. pg_test_fsync doesn’t care whether fsync

心得 Deploy Notice for Ruby on Rails app beginner | 部署Ruby on Rails app應學習的事情

By Howard Lee 31 January 2016

This article is written for Rails beginners when he/she want to deploy an app. From my experience, many things must be noticed and fixed, whose range from Ubuntu, RVM, Apache, Passenger, Postgres, Git, Capistrano and GitHub.com. The following are indexes for problems, solutions and resources I had faced. It might evolve with times change. Ubuntu List packages you have installed to a machine. Command: dpkg -l | grep {packageFullnameorPartname} Change

軟體工程 Make Postgres support full text search in Mandarin/Chinese for Rails 讓Postgres 開始支援中文全文檢索

By Howard Lee 11 January 2016

I use the gem pg_search in rails as a light-weight tool for full-text searching task of Postgres, but Postgres doesn’t support the function well in Mandarin/Chinese. After finding solutions, I take the combination of tools for full-text search in Postgres, which are pg_search gem, SCWS and zhparser. Doing it yourself according content in following links, you will setup successfully too. Remark at 20160131: This tutorial requires postgresql-server-devel-{VERSION} at Ubuntu and

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