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how to patch windows ec2 instances in private subnets

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Hi Team,

Regarding patch updates in private subnet, I came across one reference that seemed somewhat intricate. Are there simpler alternatives available for implementing patch updates?

https://aws.amazon.com/blogs/mt/how-to-patch-windows-ec2-instances-in-private-subnets-using-aws-systems-manager/

3 Answers
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Accepted Answer

The other option is to have a local wsus server in a subnet with a route to the internet either via a NAT gateway or public subnet if windows and local Linux repos which in turn they only have routes to the internet while internal servers connect to these and nothing else.

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EXPERT
answered a year ago
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EXPERT
reviewed 8 months ago
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Hello.
NAT Gateway is required for patching EC2 on private subnets.
Without a publicly accessible route, it is not possible to obtain updates from external repositories.

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EXPERT
answered a year ago
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EXPERT
reviewed 8 months ago
  • The other option is to have a local wsus server if windows and local Linux repos which in turn they only have routes to the internet while internal servers connect to these and nothing else.

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Thank you so much Riku and Gary for your immediate responses.

Let me try it out without NAT gateway as I am looking for reducing cost.

@Gary: Full context regarding this question: https://repost.aws/questions/QUyxuma6m6SO2laxH0GDBkOA/hosting-internal-application-on-aws

AWS
EXPERT
answered a year ago
  • You could then in this case use an on prem WSUS/SCCM and if using red hat, a local satellite etc.

    I’m sure I’ve also seen default routes back to on prem and allow internet connectivity via on prem. Thus negating the need of a NAT Gateway.

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