I have a problem where I want to create new subnets but some

Question

I have a problem where I want to create new subnets but some already exist and I need them to be deleted before the create happens otherwise they will conflict I found deleteBeforeReplace but don t think that solves my issue Is there any way to make delete actions happen on a resource before any creates happen

little-cartoon-10569 · Answer

Are the subnets created automatically by your cloud provider or implicitly by a sophisticated resource like `awsx ec2 Vpc` Or are they simply already existing and unmanaged

little-cartoon-10569 · Answer

You have a few options but they all sidestep Pulumi because Pulumi cannot manage == delete unmanaged resources and it cannot delete some things before it creates other things

busy-magazine-6225 · Answer

they are managed by pulumi aws ec2 Subnets specifically

busy-magazine-6225 · Answer

I have a config that is used to input what subnets we want to create

busy-magazine-6225 · Answer

If I remove all entries from that config and replace them with new ones instead of destroying the old ones and then creating it creates first

little-cartoon-10569 · Answer

That is intentional to help with zero downtime updates The Pulumi docs about autonaming covers the topic <https www pulumi com docs intro concepts resources autonaming>

little-cartoon-10569 · Answer

To manage this in your case if it is once off you could make the changes and comment the relevant code out then `up` this will delete the old vresions then put the code back and `up`

little-cartoon-10569 · Answer

Another option is to rework into separate projects or stacks and use `destroy` and `up` appropriately

little-cartoon-10569 · Answer

Finally you could ensure that the Pulumi name of the resources doesn t change Pulumi will attempt to update rather than destroy create

busy-magazine-6225 · Answer

alright thank you