我如何开启“始终在线"功能，的Azure功能? [英] How do I turn on "always-on" for an Azure Function?
问题描述
我有一个具有3个功能的功能应用程序，其中每2分钟触发一次计时器.我观察到一段时间后，该功能停止被触发，但是当我进入门户网站时重新启动.
I have a Function App with 3 functions, one of them timer-triggered every 2 minutes. I observed that after a while, the function stops being triggered, but restarts when I go to the portal.
据我了解，原因是默认情况下始终打开"处于关闭状态.但是，当我进入应用程序设置"/常规设置"时，无法激活呈灰色显示的打开"状态.我可以取消选中关闭"，这似乎并没有阻止或激活打开".
As I understand it, the reason is that by default, "Always On" is turned off. However, when I go to Application Settings / General Settings, I cannot activate the "On" state, which is grayed out. I can un-check "Off", which doesn't seem to stick or activate "On".
我缺少明显的东西吗?是Always-On解决方案可以解决我的问题，还是还有其他应做的事情?
Am I missing something obvious? Is Always-On the solution to my problem, or is there something else I should do?
注意:函数是用F#编写的；我怀疑这很重要，但是我想以防万一.
推荐答案
此答案适用于所有Azure Function方案，但由http请求触发的方案除外.
This answer applies to all Azure Function scenarios with the exception of those that are triggered by an http request.
有3种情况需要考虑:
- 您有在免费/共享的应用程序服务计划中运行的功能应用程序:始终启用"不可用，并且完全不支持这些方案.
- 您有在基本/标准/高级应用程序服务计划中运行的功能应用程序:始终开启"可用并且可以打开.实际上，它默认情况下处于打开状态，如果您将其关闭，则会在功能"用户界面中收到警告.
- 您有一个使用消费计划的功能应用程序:无需始终开启，因为系统会在需要运行功能时自动唤醒它们.对于大多数用户，这是推荐的方法.
- You have a Function App running in a Free/Shared App Service Plan: Always On is not available, and those scenarios are simply not supported.
- You have a Function App running in a Basic/Standard/Premium App Service Plan: Always On is available and can be turned on. In fact it is on by default, and you'll get a warning in the Functions UI if you turn it off.
- You have a Function App using a Consumption Plan: there is no need for Always On as the system takes care of waking up your functions whenever they need to run. This is the recommended approach for most users.
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