Removes the provider setting and improves the Readme

Author: 王超

README-CN.md

@@ -14,7 +14,10 @@ terraform-alicloud-redis
 
 ## Terraform 版本
 
-本模板要求使用版本 Terraform 0.12 和阿里云 Provider 1.56.0+。
+| Name | Version |
+|------|---------|
+| <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 0.12.0 |
+| <a name="requirement_alicloud"></a> [alicloud](#requirement\_alicloud) | >= 1.56.0
 
 ## 用法
 
@@ -152,8 +155,45 @@ module "redis" {
 更多模板详见 [Modules](https://github.com/terraform-alicloud-modules/terraform-alicloud-redis/tree/master/modules).
 
 ## 注意事项
+本Module从版本v1.9.0开始已经移除掉如下的 provider 的显示设置：
+```hcl
+provider "alicloud" {
+  profile                 = var.profile != "" ? var.profile : null
+  region                  = var.region != "" ? var.region : null
+  skip_region_validation  = var.skip_region_validation
+}
+```
+
+如果你依然想在Module中使用这个 provider 配置，你可以在调用Module的时候，指定一个特定的版本，比如 1.8.0:
+
+```hcl
+module "redis" {
+  source  = "alibaba/redis/alicloud"
+  version     = "1.8.0"
+  region      = "cn-hangzhou"
+  profile     = "Your-Profile-Name"
+  create      = true
+  vpc_name    = "my-env-redis"
+  // ...
+}
+```
+如果你想对正在使用中的Module升级到 1.9.0 或者更高的版本，那么你可以在模板中显示定义一个系统过Region的provider：
+```hcl
+provider "alicloud" {
+  region  = "cn-hangzhou"
+  profile = "Your-Profile-Name"
+}
+module "redis" {
+  source  = "alibaba/redis/alicloud"
+  create            = true
+  vpc_name          = "my-env-redis"
+  // ...
+}
+```
+
+定义完provider之后，运行命令 `terraform init` 和 `terraform apply` 来让这个provider生效即可。
 
-* 本 Module 使用的 AccessKey 和 SecretKey 可以直接从 `profile` 和 `shared_credentials_file` 中获取。如果未设置，可通过下载安装 [aliyun-cli](https://github.com/aliyun/aliyun-cli#installation) 后进行配置。
+更多provider的使用细节，请移步[How to use provider in the module](https://www.terraform.io/docs/language/modules/develop/providers.html#passing-providers-explicitly)
 
 作者
 -------

README.md

@@ -15,7 +15,10 @@ These types of resources are supported:
 
 ## Terraform versions
 
-This module requires Terraform 0.12 and Terraform Provider Alicloud 1.56.0+.
+| Name | Version |
+|------|---------|
+| <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 0.12.0 |
+| <a name="requirement_alicloud"></a> [alicloud](#requirement\_alicloud) | >= 1.56.0
 
 Usage
 -----
@@ -156,10 +159,49 @@ This module provides rich sub-modules to support different Redis version and usa
 See [more modules](https://github.com/terraform-alicloud-modules/terraform-alicloud-redis/tree/master/modules).
 
 ## Notes
+From the version v1.9.0, the module has removed the following `provider` setting:
 
-* This module using AccessKey and SecretKey are from `profile` and `shared_credentials_file`.
-If you have not set them yet, please install [aliyun-cli](https://github.com/aliyun/aliyun-cli#installation) and configure it.
+```hcl
+provider "alicloud" {
+  profile                 = var.profile != "" ? var.profile : null
+  region                  = var.region != "" ? var.region : null
+  skip_region_validation  = var.skip_region_validation
+}
+```
+
+If you still want to use the `provider` setting to apply this module, you can specify a supported version, like 1.8.0:
+
+```hcl
+module "vpc" {
+  source  = "alibaba/redis/alicloud"
+  version     = "1.8.0"
+  region      = "cn-hangzhou"
+  profile     = "Your-Profile-Name"
+  
+  create            = true
+  vpc_name          = "my-env-redis"
+  // ...
+}
+```
+
+If you want to upgrade the module to 1.9.0 or higher in-place, you can define a provider which same region with
+previous region:
+
+```hcl
+provider "alicloud" {
+   region  = "cn-hangzhou"
+   profile = "Your-Profile-Name"
+}
+module "redis" {
+  source  = "alibaba/redis/alicloud"
+  create            = true
+  vpc_name          = "my-env-redis"
+  // ...
+}
+```
 
+and then run `terraform init` and `terraform apply` to make the defined provider effect to the existing module state.
+More details see [How to use provider in the module](https://www.terraform.io/docs/language/modules/develop/providers.html#passing-providers-explicitly)
 
 Authors
 ---------

main.tf

@@ -1,11 +1,3 @@
-provider "alicloud" {
-  profile                 = var.profile != "" ? var.profile : null
-  shared_credentials_file = var.shared_credentials_file != "" ? var.shared_credentials_file : null
-  region                  = var.region != "" ? var.region : null
-  skip_region_validation  = var.skip_region_validation
-  configuration_source    = "terraform-alicloud-modules/redis"
-}
-
 locals {
   this_instance_id      = var.existing_instance_id != "" ? var.existing_instance_id : concat(alicloud_kvstore_instance.this.*.id, [""])[0]
   create_more_resources = var.existing_instance_id != "" || var.create_instance ? true : false