《使用Gin框架构建分布式应用》阅读笔记：p77-p87

《用Gin框架构建分布式应用》学习第5天，p77-p87总结，总计11页。

一、技术总结

1.Go知识点

(1)context

2.on-premises software

p80, A container is like a separate OS, but not virtualized; it only contains the dependencies needed for that one application, which makes the container portable and deployable on-premises or on the cloud。

premises的意思是“the land and buildings owned by someone, especially by a company or organization(归属于某人(尤指公司、组织)的土地或建筑物)”。简单来说 on-premises software 指的是运行在本地的服务(软件)。

wiki 对这个名称的定义很好，这里直接引用“On-premises software (abbreviated to on-prem, and often written as "on-premise") is installed and runs on computers on the premises of the person or organization using the software, rather than at a remote facility such as a server farm or cloud”。

3.openssl rand命令

openssl rand -base64 12 | docker secret create mongodb_password-

rand 命令语法：

4.查看docker latest tag对应的版本号

(1)未下载镜像

(2)已下载镜像

使用 docker inspect 命令进行查看。

5.mongo-go-driver示例

书上代码使用的mongo-go-driver v1.4.5，现在已经更新到了v2.0.0，导致有些代码无法运行，建议使用最新版。这里还得再吐槽下 Go 生态圈的文档写得太糟糕了。示例：

个人认为，上面的代码 err 就不应该忽略掉。而应该是：

二、英语总结

1.ephemeral

p79, I opted to go with Docker duce to its popularity and simplicity in runing ephermeral environment.

(1)ephemeral: ephemera + -al。

(2)ephemera: epi-("on") + hemera("day"), lasting one day , short-lived"。

三、其它

从目前的阅读体验来看，作者默认读者充分掌握Golang，丝毫不会展开介绍。

四、参考资料

1. 编程

2. 英语