upstart init.d systemd - a simple instruction

28 May 2018 in linux / devops on ubuntu

systemd

systemd is now supported by most linux system, and is the recommended way contrast to old upstart and init
the systemd config file is under /lib/systemd/system
env vars only able to be set in ExecStart or ExecStartPre, best way is to set in the script
WorkingDirectory can not use double quote, seems to be a bug?
if you app run like java -jar, should use Type=simple instead of Type=forking, otherwise it will case a timeout

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Nodejs Cluster Worker Thread Worker and Browser Worker

25 May 2018 in front-end / javascript / nodejs on multi-thread

Node.js Thread Worker

Recently nodejs have add initial thread support. It says:

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现代存储系统背后的算法--B树和LSM树的不同应用

24 May 2018 in database on algorithms

本文主要内容来自 Data Structures Course Lecture Notes ; Log Structured Merge Trees; Algorithms Behind Modern Storage Systems Different uses for read-optimized B-trees and write-optimized LSM-trees;

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有趣的nodejs版本发布策略

22 May 2018 in front-end / javascript on nodejs

本文内容主要来自这篇文章Understanding How Node.js Release Lines Work

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Sequelize a Simple Introduction

22 May 2018 in front-end on nodejs

Sequelize “An easy-to-use multi SQL dialect ORM for Node.js”

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DBeaver a primary introduce

22 May 2018 in database

I used pgAdmin to connect to postgres, I think it is good, but when I use it to connect to a heroku database, I was shocked that it do list all the database(about 200) in the heroku server instance even I have choose the dafault database to connect. Imagine you have to scroll over the whole list to find a database name - and it do not support search! I then thought how stupid this tool is.

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