Upgrade ubuntu release from 16.04 to 18.04 on ec2 instance safely
Hi there, I currently have some ec2 instances running with Ubuntu 16.04.2 LTS. I would like to upgrade them to the newer one. But I'm confused if it would take any risks. Is there a safe method to perform that? Regards,
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It depends on what your definition is of "safely".
If you define safely as zero downtime for your app, it may be better to reinstall the app in a new ec2 that uses 18.04 as a base and migrate traffic to the new instance.
If you define safely as an in-place upgrade with expected downtime, then it may be better to create an AMI of your instance, spin up a new ec2 and try the upgrade. If the upgrade works then you can deprecate the old instance.
Instead of 18.04 (Apr 2018), if possible, I would recommend using the latest Ubuntu which is 22.04 (Apr 2022) today. Both are LTS releases which have support for 5 years. The former will have support until 2023 and the latter will have support until 2027.
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