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November 12, 2020

EBS volume stuck in CloudFormation

When running CloudFormation, all the resources are being created with no problem. However it seems to be getting stuck at creating or mounting a volume. The CloudFormation fails and initiates a rollback. This is the error I am getting.

Volume attachment between volume-id vol-xxxxxxxx and instance-id i-xxxxxxx at device /dev/xvda is attaching

Volume attachment between volume-id vol-xxxxxxxx and instance-id i-xxxxxxx at device /dev/xvda is attaching

This turned out to be a conflict on HVM EC2 instances because /dev/sda1 is being remapped to /dev/xvda. My second drive is also mapped to /dev/xvda. The fix was to simply to map it slightly different to avoid mapping conflict.

Here’s the original mapping.

Boot:   /dev/xvda
Device: /dev/xvda
Device: /dev/xvdb

Boot: /dev/xvda Device: /dev/xvda Device: /dev/xvdb

Here’s the fix.

Boot:   /dev/xvda
Device: /dev/xvdb
Device: /dev/xvdc

Boot: /dev/xvda Device: /dev/xvdb Device: /dev/xvdc

Filed Under: Cloud Tagged With: aws, cloudformation, conflict, drive, mapping, template, volume

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About Me

I'm Ulysses, Cloud Engineer at Cardinal Health based in Columbus. This blog is about Linux and Cloud technology. When off the grid, I enjoy riding my electric skateboard. I've surfed, snowboarded and played the saxophone in the past. I hope you find this website helpful. It's powered by WordPress and hosted on AWS LightSail.

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