如何计算正在运行的EC2实例? [英] How can I count running EC2 Instances?

问题描述

我正在寻找一个非常基本的脚本来计算使用PowerShell在AWS上运行的EC2实例的数量.我找到了几种方法，但是由于某种原因，当我尝试它们时，却没有得到预期的结果.

I'm looking for a very basic script to count the number of running EC2 instances at AWS using PowerShell. I have found several methods but for some reason when I try them, I do not get the results I expect.

我最近的是:

$instancestate = (get-ec2instance).instances.state.name
$instancestate

返回:

stopped
running
stopped
stopped
running

(该列表持续约80个实例)

(the list goes on for about 80 instances)

我希望得到一个统计正在运行的响应的信息.

I wish to have a response that counts those which are running.

推荐答案

我不确定其他对象，但是我更愿意将ec2过滤器明确分配给变量，然后在调用诸如Get-EC2Instance之类的内容时将其列出.如果您需要在多个条件下进行过滤，这将使使用过滤器更加容易.

I'm not sure about others, but I prefer to explicitly assign my ec2 filters to variables, and then list them when calling something like Get-EC2Instance. This makes it easier to work with filters if you need to to filter on multiple conditions.

这是您要做什么的一个有效示例，其中有6个正在运行的实例:

Here's a working example of what you're after, where I have 6 running instances:

# Create the filter 
PS C:\> $filterRunning = New-Object Amazon.EC2.Model.Filter -Property @{Name = "instance-state-name"; Value = "running"}

# Force output of Get-EC2Instance into a collection.
PS C:\> $runningInstances = @(Get-EC2Instance -Filter $filterRunning)

# Count the running instances (more literally, count the collection iterates)
PS C:\> $runningInstances.Count
6

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