public void setRamdiskId(String ramdiskId) {
        this.ramdiskId = ramdiskId;
    }
<p>
The ID of the RAM disk to select. Some kernels require additional drivers at launch. Check the kernel
requirements for information about whether you need to specify a RAM disk. To find kernel requirements, go to the
Amazon Web Services Resource Center and search for the kernel ID.
</p>
<important>
<p>
We recommend that you use PV-GRUB instead of kernels and RAM disks. For more information, see <a
href="https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/UserProvidedkernels.html">PV-GRUB</a> in the <i>Amazon
EC2 User Guide</i>.
</p>
</important>

@param ramdiskId
       The ID of the RAM disk to select. Some kernels require additional drivers at launch. Check the kernel
       requirements for information about whether you need to specify a RAM disk. To find kernel requirements, go
       to the Amazon Web Services Resource Center and search for the kernel ID.</p> <important>
       <p>
       We recommend that you use PV-GRUB instead of kernels and RAM disks. For more information, see <a
       href="https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/UserProvidedkernels.html">PV-GRUB</a> in the
       <i>Amazon EC2 User Guide</i>.
       </p>
aws-java-sdk-ec2/src/main/java/com/amazonaws/services/ec2/model/RunInstancesRequest.java