如何开启“永远在线"?对于 Azure 函数? [英] How do I turn on "always-on" for an Azure Function?

问题描述

我有一个具有 3 个函数的函数应用程序，其中一个函数每 2 分钟触发一次.我观察到一段时间后，该功能停止触发，但当我进入门户时重新启动.

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，始终开启"处于关闭状态.但是，当我进入应用程序设置/常规设置时，我无法激活灰显的开启"状态.我可以取消选中关闭"，这似乎不会粘住或激活开启".

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".

我是否遗漏了一些明显的东西?Always-On 是我的问题的解决方案，还是我应该做的其他事情?

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；我怀疑它是否重要，但我想我会提到它以防万一.

推荐答案

此答案适用于所有 Azure Function 场景，但由 http 请求触发的场景除外.

This answer applies to all Azure Function scenarios with the exception of those that are triggered by an http request.

有3个案例可以看:

1. 您有一个在免费/共享应用服务计划中运行的函数应用:Always On 不可用，并且根本不支持这些场景.
2. 您有一个在基本/标准/高级应用服务计划中运行的函数应用:Always On 可用并且可以打开.事实上，它是默认开启的，如果关闭它，您会在 Functions UI 中收到警告.
3. 您有一个使用 消费计划 的函数应用程序:不需要 Always On，因为系统会在需要运行时唤醒您的函数.这是大多数用户推荐的方法.

1. 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.
2. 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.
3. 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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