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More information about your specific use case would be helpful, but something I have used in this scenario is an EFS filesystem which is mounted on all EC2 instances which are provisioned from the launch template.
In the user data just echo a row into /etc/fstab and then mount -a, and the new instance has a view of the same data as the existing instance(s).
But like I said at the start, your use case means this might not be practical.
1
Hi, an alternative to EFS is to use Amazon EBS Multi-Attach volumes that you can attach simultaneously to several EC2 instances. It may be a bit simpler to manage than EFS
See https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-volumes-multi.html
Best,
Didier
I want to use this in autoscaling group not manual
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please suggest userdata script for this
Here's an example, you need to put the actual IP (or DNS name) for the EFS mountpoint in place of the terraform resource that I used in my code, as well as having an EFS filesystem and mountpoint(s) already created:
About 1 time in 20 I found that the EFS filesystem wouldn't mount when the instance was provisioned, the while loop is to guard against this and re-try if it happens.