It turns out my builder block was set up with the wrong security group. 
Once I set this up correctly, the above configuration worked.

On Wednesday, January 13, 2021 at 4:06:35 PM UTC-5 [email protected] wrote:

> I'm trying to create an AMI (for Jenkins master in this case), and I have 
> the following Packer template, which as you see needs an SSH_PRIVATE_KEY.
>
> {
>
>   "variables" : {
>
>     "aws_access_key" : "{{ env `AWS_ACCESS_KEY` }}",
>
>     "aws_secret_key" : "{{ env `AWS_SECRET_KEY` }}",
>
>     "ssh_private_key" : "{{ env `SSH_PRIVATE_KEY` }}",
>
>     "aws_ami_us_east_1" : "{{ env `AWS_BASE_AMI` }}",
>
>     "jenkins_master_image_version" : "{{ env 
> `JENKINS_MASTER_IMAGE_VERSION` }}"
>
>   },
>
>   "builders" : [...],
>
>   "provisioners" : [...]
>
> }
>
> I invoke packer in a pipeline, like this
>
>     stage("Create Jenkins AMI") { 
>
>       steps { 
>
>         script { 
>
>           withCredentials([sshUserPrivateKey(credentialsId: "ec2-user-ssh", 
> keyFileVariable: "SSH_PRIVATE_KEY")]) { 
>
>             dir("$env.WORKSPACE/deployment/jenkins/packer") { 
>
>               sh """ 
>
>                  export AWS_BASE_AMI=`aws ec2 describe-images \ 
>
>                    --owners amazon \ 
>
>                    --filters 
> "Name=name,Values=amzn2-ami-hvm-2.0.*.?-x86_64-gp2" 
> "Name=state,Values=available" \ 
>
>                    --query "reverse(sort_by(Images, 
> &CreationDate))[:1].ImageId" \ 
>
>                    --output text` \ 
>
>                    && export 
> JENKINS_MASTER_IMAGE_VERSION=$env.JENKINS_VERSION \
>
>                    && packer build jenkins-ami-master.json 
>
>               """ 
>
>             } 
>
>           } 
>
>         } 
>
>       } 
>
>     } 
>
> Packer builds the temporary instance but fails to ssh to it, and hence 
> can't run my provisioners. what am i missing?
>
>
>

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