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fix(image\dockerfile\cmd.md): 🐛 Fix issue yeasy#535, 改进对issue进程的提法 #536

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Dec 20, 2023
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fix(image\dockerfile\cmd.md): 🐛 Fix issue yeasy#535, 改进对issue进程的提法 #536

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2 changes: 1 addition & 1 deletion image/dockerfile/cmd.md
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Expand Up @@ -40,7 +40,7 @@ CMD service nginx start

对于容器而言，其启动程序就是容器应用进程，容器就是为了主进程而存在的，主进程退出，容器就失去了存在的意义，从而退出，其它辅助进程不是它需要关心的东西。

而使用 `service nginx start` 命令，则是希望 upstart 来以后台守护进程形式启动 `nginx` 服务。而刚才说了 `CMD service nginx start` 会被理解为 `CMD [ "sh", "-c", "service nginx start"]`，因此主进程实际上是 `sh`。那么当 `service nginx start` 命令结束后，`sh` 也就结束了，`sh` 作为主进程退出了，自然就会令容器退出。
而使用 `service nginx start` 命令，则是希望 init 系统以后台守护进程的形式启动 nginx 服务。而刚才说了 `CMD service nginx start` 会被理解为 `CMD [ "sh", "-c", "service nginx start"]`，因此主进程实际上是 `sh`。那么当 `service nginx start` 命令结束后，`sh` 也就结束了，`sh` 作为主进程退出了，自然就会令容器退出。

正确的做法是直接执行 `nginx` 可执行文件，并且要求以前台形式运行。比如：

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