[英]How can I count running EC2 Instances?
I'm looking for a very basic script to count the number of running EC2 instances at AWS using PowerShell. 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。 I have found several methods but for some reason when I try them, I do not get the results I expect.
我找到了几种方法,但是由于某种原因,当我尝试它们时,我没有得到预期的结果。
The closest I have is this: 我最近的是:
$instancestate = (get-ec2instance).instances.state.name
$instancestate
which returns: 返回:
stopped
running
stopped
stopped
running
(the list goes on for about 80 instances) (该列表持续约80个实例)
I wish to have a response that counts those which are running. 我希望得到一个包含正在运行的响应的响应。
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
. 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
类的内容时将其Get-EC2Instance
。 This makes it easier to work with filters if you need to to filter on multiple conditions. 如果您需要在多个条件下进行过滤,这使得使用过滤器更加容易。
Here's a working example of what you're after, where I have 6 running instances: 这是您要执行的操作示例,其中有6个正在运行的实例:
# 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
http://docs.aws.amazon.com/powershell/latest/reference/Index.html?page=Get-EC2Instance.html&tocid=Get-EC2Instance http://docs.aws.amazon.com/powershell/latest/reference/Index.html?page=Get-EC2Instance.html&tocid=Get-EC2Instance
From this it looks like the following would work (I'm not sure about the filter syntax): 由此看来,以下方法可以工作(我不确定过滤器语法):
$i = Get-EC2Instance -Filter @{Name = "instance-state-name"; Value = "running"}
$i.Count
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