日常工作中，我们总是习惯于通过量化的标准去衡量我们对事物的评价，比如美食点评的星级、酒店的星级、每个个人的信用评分等等。而作为一个 Web 工程师，我们也总是在意于我们网站的性能，因为网站的性能会最直接地影响用户的体验。今天要介绍的就是一种同样能够帮助工程师对应用性能进行量化评估的标准 —— Apdex 。

Many people are accustomed to start a Nginx web server through init scripts and then they can control the state of the server through service command, such as sudo service nginx restart. But sometimes unobvious config error makes the scripts failed to work. Here I will show an error related to pi...