resource-lifecycle-methods.md

Resource Lifecycle Methods

An overview of a resource's lifecycle methods called for the "terraform refresh" and "terraform apply" actions

The Create, Read & Delete Methods

resource		terraform refresh	terraform apply
- not in infrastructure
-- not in terraform state
--- not in terraform config	-	---	---
--- in terraform config	1	---	Create, Read
-- in terraform state
--- not in terraform config	2	Read (clear state)
--- in terraform config	3	Read (clear state)	Create, Read
- in infrastructure
-- not in terraform state
--- not in terraform config	-	---	---
--- in terraform config	4	---	Create (error)
-- in terraform state
--- not in terraform config	5	Read (refresh state)	Delete
--- in terraform config
> config same as state	6	Read (refresh state)	---
>> changed computed fields	7	Read (refresh state)	---
> config different from state
>> changed force-new fields	8	Read (refresh state)	Delete, Create, Read
>> changed common fields	-	n.a.	n.a.

ℹ️
ForceNew: true, must be set for all fields in the schema, except the Computed fields

Adding The Update Method

💡
terraform-provider-hosts DOES support the Update method

resource		terraform refresh	terraform apply
- not in infrastructure
-- not in terraform state
--- not in terraform config	-	---	---
--- in terraform config	1	---	Create, Read
-- in terraform state
--- not in terraform config	2	Read (clear state)
--- in terraform config	3	Read (clear state)	Create, Read
- in infrastructure
-- not in terraform state
--- not in terraform config	-	---	---
--- in terraform config	4	---	Create (error)
-- in terraform state
--- not in terraform config	5	Read (refresh state)	Delete
--- in terraform config
> config same as state	6	Read (refresh state)	---
>> changed computed fields	7	Read (refresh state)	---
> config different from state
>> changed force-new fields	8	Read (refresh state)	Delete, Create, Read
>> changed common fields	9	Read (refresh state)	Update, Read

Adding The Exists Method

💡
terraform-provider-hosts DOES NOT supports the Exists method

resource		terraform refresh	terraform apply
- not in infrastructure
-- not in terraform state
--- not in terraform config	-	---	---
--- in terraform config	1	---	Create, Read
-- in terraform state
--- not in terraform config	2	Exists (clear state)
--- in terraform config	3	Exists (clear state)	Create, Read
- in infrastructure
-- not in terraform state
--- not in terraform config	-	---	---
--- in terraform config	4	---	Create (error)
-- in terraform state
--- not in terraform config	5	Exists, Read (refresh state)	Delete
--- in terraform config
> config same as state	6	Exists, Read (refresh state)	---
>> changed computed fields	7	Exists, Read (refresh state)	---
> config different from state
>> changed force-new fields	8	Exists, Read (refresh state)	Delete, Create, Read
>> changed common fields	9	Exists, Read (refresh state)	Update, Read