UbuntuHelp:EC2/RefreshPolicy
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目录
Overview
This page covers the policy for releasing updated ubuntu images to EC2. The following are things to consider:
- As updates are made available to a development or stable release, the time it takes for an instance of that image to update itself increases.
- There is no way to change the default kernel (aki) and ramdisk (ari) associated with a AMI. Instead, you have to publish a new AMI each time a new kernel or ramdisk is available.
- When starting an instance, the user *can* choose a different kernel and ramdisk than the default associated with the ami.
Kernel Updates
Stable Releases
EC2 kernels and ramdisks will be released when kernel updates are done. For example, each time a new version of linux-image is released, a new aki and ami will be released. Release of a new AKI and ARI will not dictate release of a new AMI. Users can find the newest AKI and ARI for a given AMI release by utilizing the currency function discussed below.
Development Releases
Kernels and ramdisks for development releases will be released when the corresponding AMIs are released. For development releases there will not be separate AMI and AKI/ARI releases. An AMI will be released with the latest kernel at that time.
AMI Updates
Stable Releases
New AMIs will be published for stable releases based on
- The size of updates that need to be applied to the most recent version of the current AMI.
- Security updates or Major flaws. If there are highly important security updates or major functionality fixes available that cannot be obtained via 'apt-get update', then new AMIs may be released to incorporate those changes outside of 'a' above.
At the time of publish, AMIs will be associated with the latest AKI/ARI that is available.
Development Releases
Development releases will regularly update the AMIs. Each AMI published will reference the latest AKI/ARI available at the time.
Currency
Discussion here about how to find information on what is the latest image
Support Life Time
The release policy above will apply to EC2 images for the same time frame that is applied to other Ubuntu Server releases. That is 5 years for LTS releases, and 18 months for other releases.
