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IDProjectCategoryView StatusLast Update
0015147CentOS-6Cloud-Imagespublic2018-08-06 13:02
Reporterbodgit 
PriorityimmediateSeveritymajorReproducibilityalways
Status newResolutionopen 
Product Version6.10 
Target VersionFixed in Version 
Summary0015147: CentOS 6 AMI has ENA support enabled yet there's no driver?
DescriptionI'm in the eu-west-1 AWS region and currently using ami-404f4339 which is "CentOS Linux 6 x86_64 HVM EBS ENA 1805_01"

The CentOS 6 AMI appears to have the ENA support enabled:

aws ec2 describe-images --image-id ami-404f4339 --query "Images[].EnaSupport"
[
    true
]

Yet if I try and boot this AMI as an r4.2xlarge then the instance boots up without any networking as it is inheriting the ENA support from the AMI. If I stop the instance, disable ENA on the instance ID and start it back up again then it has functioning networking.

If I look in /boot/config-$(uname -r) then there's no mention of CONFIG_ENA_ETHERNET which is present in a CentOS 7 AMI config. I can't see that you're including the ENA driver in any way in the kernel and upstream RHEL doesn't support ENA on any 6.x version and only in 7.x from 7.4 onwards so I don't think the AMI should have this flag set as it's unusable on certain instance types.
Steps To ReproduceBoot ami-404f4339 on an instance such as r4.*, c5.*, m5.*, etc.
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Date Modified Username Field Change
2018-08-06 13:02 bodgit New Issue