113 lines
6.0 KiB
Markdown
113 lines
6.0 KiB
Markdown
---
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layout: "language"
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page_title: "Backend Type: oss"
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sidebar_current: "docs-backends-types-standard-oss"
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description: |-
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Terraform can store state remotely in OSS and lock that state with OSS.
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---
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# OSS
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**Kind: Standard (with locking via TableStore)**
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Stores the state as a given key in a given bucket on Stores
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[Alibaba Cloud OSS](https://www.alibabacloud.com/help/product/31815.htm).
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This backend also supports state locking and consistency checking via
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[Alibaba Cloud Table Store](https://www.alibabacloud.com/help/doc-detail/27280.htm), which can be enabled by setting
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the `tablestore_table` field to an existing TableStore table name.
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-> **Note:** The OSS backend is available from terraform version 0.12.2.
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## Example Configuration
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```hcl
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terraform {
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backend "oss" {
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bucket = "bucket-for-terraform-state"
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prefix = "path/mystate"
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key = "version-1.tfstate"
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region = "cn-beijing"
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tablestore_endpoint = "https://terraform-remote.cn-hangzhou.ots.aliyuncs.com"
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tablestore_table = "statelock"
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}
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}
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```
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This assumes we have a [OSS Bucket](https://registry.terraform.io/providers/aliyun/alicloud/latest/docs/resources/oss_bucket) created called `bucket-for-terraform-state`,
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a [OTS Instance](https://registry.terraform.io/providers/aliyun/alicloud/latest/docs/resources/ots_instance) called `terraform-remote` and
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a [OTS TableStore](https://registry.terraform.io/providers/aliyun/alicloud/latest/docs/resources/ots_table) called `statelock`. The
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Terraform state will be written into the file `path/mystate/version-1.tfstate`. The `TableStore` must have a primary key named `LockID` of type `String`.
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## Data Source Configuration
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To make use of the OSS remote state in another configuration, use the
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[`terraform_remote_state` data
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source](/docs/language/state/remote-state-data.html).
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```hcl
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terraform {
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backend "oss" {
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bucket = "remote-state-dns"
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prefix = "mystate/state"
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key = "terraform.tfstate"
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region = "cn-beijing"
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}
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}
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```
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The `terraform_remote_state` data source will return all of the root outputs
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defined in the referenced remote state, an example output might look like:
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```
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data "terraform_remote_state" "network" {
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backend = "oss"
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config = {
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bucket = "remote-state-dns"
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key = "terraform.tfstate"
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prefix = "mystate/state"
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region = "cn-beijing"
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}
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outputs = {}
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workspace = "default"
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}
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```
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## Configuration variables
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The following configuration options or environment variables are supported:
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* `access_key` - (Optional) Alibaba Cloud access key. It supports environment variables `ALICLOUD_ACCESS_KEY` and `ALICLOUD_ACCESS_KEY_ID`.
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* `secret_key` - (Optional) Alibaba Cloud secret access key. It supports environment variables `ALICLOUD_SECRET_KEY` and `ALICLOUD_ACCESS_KEY_SECRET`.
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* `security_token` - (Optional) STS access token. It supports environment variable `ALICLOUD_SECURITY_TOKEN`.
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* `ecs_role_name` - (Optional, Available in 0.12.14+) The RAM Role Name attached on a ECS instance for API operations. You can retrieve this from the 'Access Control' section of the Alibaba Cloud console.
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* `region` - (Optional) The region of the OSS bucket. It supports environment variables `ALICLOUD_REGION` and `ALICLOUD_DEFAULT_REGION`.
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* `endpoint` - (Optional) A custom endpoint for the OSS API. It supports environment variables `ALICLOUD_OSS_ENDPOINT` and `OSS_ENDPOINT`.
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* `bucket` - (Required) The name of the OSS bucket.
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* `prefix` - (Opeional) The path directory of the state file will be stored. Default to "env:".
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* `key` - (Optional) The name of the state file. Defaults to `terraform.tfstate`.
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* `tablestore_endpoint` / `ALICLOUD_TABLESTORE_ENDPOINT` - (Optional) A custom endpoint for the TableStore API.
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* `tablestore_table` - (Optional) A TableStore table for state locking and consistency. The table must have a primary key named `LockID` of type `String`.
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* `encrypt` - (Optional) Whether to enable server side
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encryption of the state file. If it is true, OSS will use 'AES256' encryption algorithm to encrypt state file.
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* `acl` - (Optional) [Object
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ACL](https://www.alibabacloud.com/help/doc-detail/52284.htm)
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to be applied to the state file.
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* `shared_credentials_file` - (Optional, Available in 0.12.8+) This is the path to the shared credentials file. It can also be sourced from the `ALICLOUD_SHARED_CREDENTIALS_FILE` environment variable. If this is not set and a profile is specified, `~/.aliyun/config.json` will be used.
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* `profile` - (Optional, Available in 0.12.8+) This is the Alibaba Cloud profile name as set in the shared credentials file. It can also be sourced from the `ALICLOUD_PROFILE` environment variable.
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* `assume_role` - (Optional, Available in 0.12.6+) If provided with a role ARN, will attempt to assume this role using the supplied credentials.
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The nested `assume_role` block supports the following:
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* `role_arn` - (Required) The ARN of the role to assume. If ARN is set to an empty string, it does not perform role switching. It supports environment variable `ALICLOUD_ASSUME_ROLE_ARN`.
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Terraform executes configuration on account with provided credentials.
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* `policy` - (Optional) A more restrictive policy to apply to the temporary credentials. This gives you a way to further restrict the permissions for the resulting temporary
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security credentials. You cannot use this policy to grant permissions which exceed those of the role that is being assumed.
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* `session_name` - (Optional) The session name to use when assuming the role. If omitted, 'terraform' is passed to the AssumeRole call as session name. It supports environment variable `ALICLOUD_ASSUME_ROLE_SESSION_NAME`.
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* `session_expiration` - (Optional) The time after which the established session for assuming role expires. Valid value range: [900-3600] seconds. Default to 3600 (in this case Alibaba Cloud use own default value). It supports environment variable `ALICLOUD_ASSUME_ROLE_SESSION_EXPIRATION`.
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-> **Note:** If you want to store state in the custom OSS endpoint, you can specify a environment variable `OSS_ENDPOINT`, like "oss-cn-beijing-internal.aliyuncs.com"
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