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website: Provider proxy config only supports alias

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Thomas Alton 2019-06-12 12:21:29 -05:00 committed by Martin Atkins
parent 24386bcfcb
commit ddd0d2a442
1 changed files with 10 additions and 12 deletions
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website/docs/configuration/modules.html.md
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@ -328,19 +328,17 @@ provider "aws" {
Each resource should then have its own `provider` attribute set to either
`"aws.src"` or `"aws.dst"` to choose which of the two provider instances to use.
At this time it is required to write an explicit proxy configuration block
even for default (un-aliased) provider configurations when they will be passed
via an explicit `providers` block:
A proxy configuration block is one that is either completely empty or that
contains only the `alias` argument. It serves as a placeholder for
provider configurations passed between modules. Although an empty proxy
configuration block is valid, it is not necessary: proxy configuration blocks
are needed only to establish which _alias_ provider configurations a child
module is expecting.
```hcl
provider "aws" {
}
```
If such a block is not present, the child module will behave as if it has no
configurations of this type at all, which may cause input prompts to supply
any required provider configuration arguments. This limitation will be
addressed in a future version of Terraform.
A proxy configuration block must not include the `version` argument. To specify
version constraints for a particular child module without creating a local
module configuration, use the [`required_providers`](/docs/configuration/terraform.html#specifying-required-provider-versions)
setting inside a `terraform` block.
## Multiple Instances of a Module