Hi, Anyone can suggest best way to upgrade from version 0.12 to 1.0, seems like can no longer run 0.12 …
What do you mean that you can no longer run 0.12?
It would be recommended to keep up to date eith Terraform versions to take advantage of new features/bug fixes and also to remain compatible with the various providers & public modules.
To upgrade you need to go a version at a time, adjusting any code (some breaking things were removed or changed in each version bump) and run
terraform apply to upgrade the state file. So in your case use 0.13 (with the upgrade feature) then 0.14 and then 0.15 (the bump from 0.15 to 1.0 is straightforward as they are actually the same version, just with a different version scheme half way through).
sorry, it was a false alarm yes can still run 0.12 and thanks for the upgrade advice, will look into that as well