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IDProjectCategoryView StatusLast Update
0000436AlmaLinux-9cloud-initpublic2023-10-27 20:05
Reporterkevbo Assigned Toelkhan  
Status assignedResolutionopen 
Summary0000436: AWS EC2 images don't work on an IPv6 only Subnet
DescriptionAlmaLinux 9 won't properly initialize on an IPv6 only Subnet in EC2
Steps To ReproduceCreate an IPv6 only Subnet in your VPC (choose "No IPv4 CIDR".

Launch an instance (I used ami-0cee948d95563ce2c, us-east-2 AARCH64). Use the IPv6 only subnet as its subnet.

Watch the boot using the Serial Console. It kind of hangs at the end of the kernel init, and finally will show a login prompt. It doesn't appear that cloud-init works.

(I mounted the image in another instance and saw there was no key in ~ec2-user/.ssh/authorized-keys.)

I can't connect to the instance with SSH.
Additional InformationThis is likely due to:

However...if you launch AWS Linux 2023 or Debian 12 (I tested 2023-10-13), they work. They both use cloud-init. Which means, this is possible. (Note: Fedora 38 also has the problem...which means AWS Linux fixed the issue, but somehow it didn't make its way to Fedora. Thanks guys.)

I don't know if this is the kind of thing that Alma might be willing to deviate from upstream for. Also, who knows how long it will take upstream to fix.
TagsNo tags attached.



2023-10-27 19:52

developer   ~0000988

Last edited: 2023-10-27 20:05

Hi kevbo,

Thanks a lot for your contribution.

This is fixed[^1] on 22.2 version of Cloud-init.

Since, the Cloud-init packages on AlmaLinux OS 8.9 and 9.3 are rebased from the 23.1.1 upstream, the patch already included[^2].

We are closely monitoring the upstream patch[^3] which is currently work in progress with implementation of unit tests. Once it's merged we will backport it.


Issue History

Date Modified Username Field Change
2023-10-27 00:36 kevbo New Issue
2023-10-27 17:56 elkhan Assigned To => elkhan
2023-10-27 17:56 elkhan Status new => assigned
2023-10-27 19:52 elkhan Note Added: 0000988
2023-10-27 20:05 elkhan Note Edited: 0000988