├── azure
    ├── azurerm_resource_group.tf
    ├── azure_cdn_frontdoor_rule_set.tf
    ├── azure_cdn_frontdoor_profile.tf
    ├── azure_cdn_frontdoor_endpoint.tf
    ├── provider.tf
    ├── azure_cdn_frontdoor_origin_group.tf
    ├── azure_cdn_frontdoor_route.tf
    ├── azure_cdn_frontdoor_rule.tf
    ├── variables.tf
    └── azure_cdn_frontdoor_origin.tf
├── aws
    ├── provider.tf
    ├── aws_cloudfront_function.tf
    ├── variables.tf
    ├── aws_cloudfront_origin_request_policy.tf
    ├── databricks_warehouse_function.js
    ├── aws_cloudfront_cache_policy.tf
    └── aws_cloudfront_distribution.tf
├── README.md
├── .gitignore
└── LICENSE


/azure/azurerm_resource_group.tf:
--------------------------------------------------------------------------------
1 | resource "azurerm_resource_group" "databricks_example_rg" {
2 |   name     = "${var.rg_name}"
3 |   location = "${var.region}"
4 | }


--------------------------------------------------------------------------------
/aws/provider.tf:
--------------------------------------------------------------------------------
 1 | terraform {
 2 |   required_providers {
 3 |     aws = {
 4 |       source = "hashicorp/aws"
 5 |     }
 6 |   }
 7 | }
 8 | 
 9 | provider "aws" {
10 |   region = var.region
11 | }
12 | 


--------------------------------------------------------------------------------
/azure/azure_cdn_frontdoor_rule_set.tf:
--------------------------------------------------------------------------------
1 | resource "azurerm_cdn_frontdoor_rule_set" "databricks_example_ruleset" {
2 |   name                     = "DatabricksExampleRuleSet"
3 |   cdn_frontdoor_profile_id = azurerm_cdn_frontdoor_profile.databricks_example_profile.id
4 | }


--------------------------------------------------------------------------------
/azure/azure_cdn_frontdoor_profile.tf:
--------------------------------------------------------------------------------
1 | resource "azurerm_cdn_frontdoor_profile" "databricks_example_profile" {
2 |   name                = "databricks-example-frontdoor-profile"
3 |   resource_group_name = "${var.rg_name}"
4 |   sku_name            = "Premium_AzureFrontDoor"
5 | }


--------------------------------------------------------------------------------
/azure/azure_cdn_frontdoor_endpoint.tf:
--------------------------------------------------------------------------------
1 | resource "azurerm_cdn_frontdoor_endpoint" "databricks_example_endpoint" {
2 |   name                     = "databricks-example-frontdoor-endpoint"
3 |   cdn_frontdoor_profile_id = azurerm_cdn_frontdoor_profile.databricks_example_profile.id
4 | }


--------------------------------------------------------------------------------
/azure/provider.tf:
--------------------------------------------------------------------------------
 1 | terraform {
 2 |   required_providers {
 3 |     azurerm = {
 4 |       source = "hashicorp/azurerm"
 5 |     }
 6 |   }
 7 | }
 8 | 
 9 | provider "azurerm" {
10 |  tenant_id = "${var.tenant_id}"
11 |  subscription_id = "${var.subscription_id}"
12 |  features {}
13 | }


--------------------------------------------------------------------------------
/aws/aws_cloudfront_function.tf:
--------------------------------------------------------------------------------
1 | resource "aws_cloudfront_function" "dbx_example_function" {
2 |   name    = "databricks_warehouse_function"
3 |   runtime = "cloudfront-js-2.0"
4 |   comment = "Update a URL to add the warehouse info."
5 |   publish = true
6 |   code    = file("${path.module}/databricks_warehouse_function.js")
7 | }


--------------------------------------------------------------------------------
/aws/variables.tf:
--------------------------------------------------------------------------------
 1 | variable "workspace_url" {
 2 |  type = string
 3 |  default = "community.cloud.databricks.com"
 4 |  description = "URL of Databricks workspace, excluding leading https://"
 5 | }
 6 | 
 7 | variable "region" {
 8 |  type = string
 9 |  default = "us-east-2"
10 |  description = "AWS region for resource deployment"   
11 | } 


--------------------------------------------------------------------------------
/aws/aws_cloudfront_origin_request_policy.tf:
--------------------------------------------------------------------------------
 1 | resource "aws_cloudfront_origin_request_policy" "dbx_example_origin_policy" {
 2 |   name    = "databricks-example-origin-policy"
 3 |   comment = "Policy for Stable URL on Databricks"
 4 |   cookies_config {
 5 |     cookie_behavior = "all"
 6 |   }
 7 |   headers_config {
 8 |     header_behavior = "allExcept"
 9 |     headers {
10 |       items = ["host"]
11 |     }
12 |   }
13 |   query_strings_config {
14 |     query_string_behavior = "all"
15 |   }
16 | }


--------------------------------------------------------------------------------
/aws/databricks_warehouse_function.js:
--------------------------------------------------------------------------------
 1 | async function handler(event) {
 2 | 
 3 |     // these should be stored in a KeyValueStore
 4 |     const warehouseID = "<insert warehouse ID";
 5 |     const WSID = "<insert databricks workspace URL (no https://)>";
 6 |     const newurl = `https://${WSID}/sql/1.0/warehouses/${warehouseID}`;
 7 | 
 8 |     const response = {
 9 |         statusCode: 302,
10 |         statusDescription: 'Found',
11 |         headers:
12 |             { "location": { "value": newurl } }
13 |         }
14 | 
15 |     return response;
16 | }


--------------------------------------------------------------------------------
/aws/aws_cloudfront_cache_policy.tf:
--------------------------------------------------------------------------------
 1 | resource "aws_cloudfront_cache_policy" "dbx_example_cache_policy" {
 2 |   comment     = "Databricks Example Caching Policy"
 3 |   default_ttl = "0"
 4 |   max_ttl     = "0"
 5 |   min_ttl     = "0"
 6 |   name        = "databricks-example-cache-policy"
 7 | 
 8 |   parameters_in_cache_key_and_forwarded_to_origin {
 9 |     cookies_config {
10 |       cookie_behavior = "none"
11 |     }
12 | 
13 |     enable_accept_encoding_brotli = "false"
14 |     enable_accept_encoding_gzip   = "false"
15 | 
16 |     headers_config {
17 |       header_behavior = "none"
18 |     }
19 | 
20 |     query_strings_config {
21 |       query_string_behavior = "none"
22 |     }
23 |   }
24 | }


--------------------------------------------------------------------------------
/azure/azure_cdn_frontdoor_origin_group.tf:
--------------------------------------------------------------------------------
 1 | resource "azurerm_cdn_frontdoor_origin_group" "databricks_example_origin_group" {
 2 |   name                     = "databricks-example-origin-group"
 3 |   cdn_frontdoor_profile_id = azurerm_cdn_frontdoor_profile.databricks_example_profile.id
 4 |   session_affinity_enabled = false
 5 | 
 6 |   restore_traffic_time_to_healed_or_new_endpoint_in_minutes = 10
 7 | 
 8 |   health_probe {
 9 |     interval_in_seconds = 240
10 |     path                = "/healthProbe"
11 |     protocol            = "Https"
12 |     request_type        = "HEAD"
13 |   }
14 | 
15 |   load_balancing {
16 |     additional_latency_in_milliseconds = 0
17 |     sample_size                        = 16
18 |     successful_samples_required        = 3
19 |   }
20 | }


--------------------------------------------------------------------------------
/azure/azure_cdn_frontdoor_route.tf:
--------------------------------------------------------------------------------
 1 | resource "azurerm_cdn_frontdoor_route" "databricks_example_route" {
 2 |   name                          = "example-route"
 3 |   cdn_frontdoor_endpoint_id     = azurerm_cdn_frontdoor_endpoint.databricks_example_endpoint.id
 4 |   cdn_frontdoor_origin_group_id = azurerm_cdn_frontdoor_origin_group.databricks_example_origin_group.id
 5 |   cdn_frontdoor_origin_ids      = [azurerm_cdn_frontdoor_origin.primary_workspace_origin.id,azurerm_cdn_frontdoor_origin.secondary_workspace_origin.id]
 6 |   cdn_frontdoor_rule_set_ids    = [azurerm_cdn_frontdoor_rule_set.databricks_example_ruleset.id]
 7 |   enabled                       = true
 8 | 
 9 |   forwarding_protocol    = "HttpsOnly"
10 |   https_redirect_enabled = true
11 |   patterns_to_match      = ["/*"]
12 |   supported_protocols    = ["Http", "Https"]
13 | }


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | # dbx-stable-url
 2 | A small Terraform Repository to create Stable URL infrastructure for Databricks workspaces in AWS and Azure. See blog [here](https://medium.com/databricks-platform-sme/the-balanced-lakehouse-load-balancing-databricks-workspaces-using-cloud-cdns-12cb141cffe5).
 3 | 
 4 | # Required Tools:
 5 | - [Terraform](https://www.terraform.io/)
 6 | - Access to AWS or Azure environment where Databricks workspaces are deployed
 7 | - AWS or Azure CLI
 8 | 
 9 | # Instructions
10 | From the AWS or Azure example folder, update the `variables.tf` file (if using AWS, also update `databricks_warehouse_function.js`) and then run terraform. This will create the CDN infrastructure required to maintain a stable URL across two separate workspaces.
11 | 
12 | *Note: this repo is provided as-is and as an example only. You will likely need to update the provided infrastructure to add appropriate security settings, company-mandated tags, etc.*
13 | 


--------------------------------------------------------------------------------
/azure/azure_cdn_frontdoor_rule.tf:
--------------------------------------------------------------------------------
 1 | resource "azurerm_cdn_frontdoor_rule" "example" {
 2 |   depends_on = [azurerm_cdn_frontdoor_origin_group.databricks_example_origin_group, azurerm_cdn_frontdoor_origin.primary_workspace_origin, azurerm_cdn_frontdoor_origin.secondary_workspace_origin]
 3 | 
 4 |   name                      = "DatabricksExampleRule"
 5 |   cdn_frontdoor_rule_set_id = azurerm_cdn_frontdoor_rule_set.databricks_example_ruleset.id
 6 |   order                     = 1
 7 |   behavior_on_match         = "Continue"
 8 | 
 9 |   actions {
10 |     url_redirect_action {
11 |       redirect_type        = "Found"
12 |       redirect_protocol    = "MatchRequest"
13 |       destination_path     = "/sql/1.0/warehouses/${var.primary_warehouse_id}"
14 |       destination_hostname = "${var.primary_workspace_url}"
15 |     }
16 |   }
17 | 
18 |   conditions {
19 |     url_path_condition {
20 |       operator         = "Contains"
21 |       negate_condition = false
22 |       match_values     = ["warehouse"]
23 |     }
24 |   }
25 | }


--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
 1 | # MacOS
 2 | .DS_Store
 3 | 
 4 | # Local .terraform directories
 5 | **/.terraform/*
 6 | 
 7 | # .tfstate files
 8 | *.tfstate
 9 | *.tfstate.*
10 | 
11 | # Crash log files
12 | crash.log
13 | crash.*.log
14 | 
15 | # Exclude all .tfvars files, which are likely to contain sensitive data, such as
16 | # password, private keys, and other secrets. These should not be part of version 
17 | # control as they are data points which are potentially sensitive and subject 
18 | # to change depending on the environment.
19 | *.tfvars
20 | *.tfvars.json
21 | 
22 | # Ignore override files as they are usually used to override resources locally and so
23 | # are not checked in
24 | override.tf
25 | override.tf.json
26 | *_override.tf
27 | *_override.tf.json
28 | 
29 | # Include override files you do wish to add to version control using negated pattern
30 | # !example_override.tf
31 | 
32 | # Include tfplan files to ignore the plan output of command: terraform plan -out=tfplan
33 | # example: *tfplan*
34 | 
35 | # Ignore CLI configuration files
36 | .terraformrc
37 | terraform.rc
38 | 


--------------------------------------------------------------------------------
/azure/variables.tf:
--------------------------------------------------------------------------------
 1 | variable "primary_workspace_url" {
 2 |  type = string
 3 |  default = "community.cloud.databricks.com"
 4 |  description = "URL of primary Databricks workspace, excluding leading https://"
 5 | }
 6 | 
 7 | variable "primary_warehouse_id" {
 8 |  type = string
 9 |  default = "1bdfaec3ab74501f"
10 |  description = "ID of primary Databricks SQL Warehouse"
11 | }
12 | 
13 | variable "secondary_workspace_url" {
14 |  type = string
15 |  default = "community.cloud.databricks.com"
16 |  description = "URL of secondary Databricks workspace, excluding leading https://"
17 | }
18 | 
19 | variable "region" {
20 |  type = string
21 |  default = "use"
22 |  description = "Azure region for resource deployment"   
23 | } 
24 | 
25 | variable "rg_name" {
26 |  type = string
27 |  default = "databricks_stableurl_example_rg"
28 |  description = "Resource Group name for example infrastructure"
29 | }
30 | 
31 | variable "tenant_id" {
32 |  type = string
33 |  sensitive = true
34 |  description = "Azure Tenant ID"
35 | } 
36 | 
37 | variable "subscription_id" {
38 |  type = string
39 |  sensitive = true
40 |  description = "Azure Subscription ID"
41 | } 


--------------------------------------------------------------------------------
/azure/azure_cdn_frontdoor_origin.tf:
--------------------------------------------------------------------------------
 1 | resource "azurerm_cdn_frontdoor_origin" "primary_workspace_origin" {
 2 |   name                          = "databricks-example-primary-origin"
 3 |   cdn_frontdoor_origin_group_id = azurerm_cdn_frontdoor_origin_group.databricks_example_origin_group.id
 4 |   enabled                       = true
 5 | 
 6 |   certificate_name_check_enabled = true
 7 | 
 8 |   host_name          = "${var.primary_workspace_url}"
 9 |   http_port          = 80
10 |   https_port         = 443
11 |   origin_host_header = "${var.primary_workspace_url}"
12 |   priority           = 1
13 |   weight             = 1
14 | }
15 | 
16 | resource "azurerm_cdn_frontdoor_origin" "secondary_workspace_origin" {
17 |   name                          = "databricks-example-secondary-origin"
18 |   cdn_frontdoor_origin_group_id = azurerm_cdn_frontdoor_origin_group.databricks_example_origin_group.id
19 |   enabled                       = true
20 | 
21 |   certificate_name_check_enabled = true
22 | 
23 |   host_name          = "${var.secondary_workspace_url}"
24 |   http_port          = 80
25 |   https_port         = 443
26 |   origin_host_header = "${var.secondary_workspace_url}"
27 |   priority           = 1
28 |   weight             = 1
29 | }


--------------------------------------------------------------------------------
/aws/aws_cloudfront_distribution.tf:
--------------------------------------------------------------------------------
 1 | resource "aws_cloudfront_distribution" "dbx_example_distribution" {
 2 |   comment = "Distribution for Stable Databricks URL"
 3 | 
 4 |   default_cache_behavior {
 5 |     allowed_methods          = ["DELETE", "GET", "HEAD", "OPTIONS", "PATCH", "POST", "PUT"]
 6 |     cache_policy_id          = "${aws_cloudfront_cache_policy.dbx_example_cache_policy.id}"
 7 |     cached_methods           = ["GET", "HEAD"]
 8 |     compress                 = "true"
 9 |     default_ttl              = "0"
10 |     max_ttl                  = "0"
11 |     min_ttl                  = "0"
12 |     origin_request_policy_id = "${aws_cloudfront_origin_request_policy.dbx_example_origin_policy.id}"
13 |     smooth_streaming         = "false"
14 |     target_origin_id         = var.workspace_url
15 |     viewer_protocol_policy   = "allow-all"
16 |   }
17 | 
18 |   enabled         = "true"
19 |   http_version    = "http2"
20 |   is_ipv6_enabled = "false"
21 | 
22 |   ordered_cache_behavior {
23 |     allowed_methods = ["DELETE", "GET", "HEAD", "OPTIONS", "PATCH", "POST", "PUT"]
24 |     cache_policy_id = "${aws_cloudfront_cache_policy.dbx_example_cache_policy.id}"
25 |     cached_methods  = ["GET", "HEAD"]
26 |     compress        = "true"
27 |     default_ttl     = "0"
28 | 
29 |     function_association {
30 |       event_type   = "viewer-request"
31 |       function_arn = "${aws_cloudfront_function.dbx_example_function.arn}"
32 |     }
33 | 
34 |     max_ttl                  = "0"
35 |     min_ttl                  = "0"
36 |     origin_request_policy_id = "${aws_cloudfront_origin_request_policy.dbx_example_origin_policy.id}"
37 |     path_pattern             = "/warehouse"
38 |     smooth_streaming         = "false"
39 |     target_origin_id         = var.workspace_url
40 |     viewer_protocol_policy   = "allow-all"
41 |   }
42 | 
43 |   origin {
44 |     connection_attempts = "3"
45 |     connection_timeout  = "10"
46 | 
47 |     custom_origin_config {
48 |       http_port                = "80"
49 |       https_port               = "443"
50 |       origin_keepalive_timeout = "5"
51 |       origin_protocol_policy   = "match-viewer"
52 |       origin_read_timeout      = "30"
53 |       origin_ssl_protocols     = ["TLSv1.2"]
54 |     }
55 | 
56 |     domain_name = var.workspace_url
57 |     origin_id   = var.workspace_url
58 |   }
59 | 
60 |   price_class = "PriceClass_All"
61 | 
62 |   restrictions {
63 |     geo_restriction {
64 |       restriction_type = "none"
65 |     }
66 |   }
67 | 
68 |   retain_on_delete = "false"
69 |   staging          = "false"
70 | 
71 |   viewer_certificate {
72 |     cloudfront_default_certificate = "true"
73 |     minimum_protocol_version       = "TLSv1"
74 |   }
75 | }
76 | 


--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------
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178 |    APPENDIX: How to apply the Apache License to your work.
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180 |       To apply the Apache License to your work, attach the following
181 |       boilerplate notice, with the fields enclosed by brackets "[]"
182 |       replaced with your own identifying information. (Don't include
183 |       the brackets!)  The text should be enclosed in the appropriate
184 |       comment syntax for the file format. We also recommend that a
185 |       file or class name and description of purpose be included on the
186 |       same "printed page" as the copyright notice for easier
187 |       identification within third-party archives.
188 | 
189 |    Copyright [yyyy] [name of copyright owner]
190 | 
191 |    Licensed under the Apache License, Version 2.0 (the "License");
192 |    you may not use this file except in compliance with the License.
193 |    You may obtain a copy of the License at
194 | 
195 |        http://www.apache.org/licenses/LICENSE-2.0
196 | 
197 |    Unless required by applicable law or agreed to in writing, software
198 |    distributed under the License is distributed on an "AS IS" BASIS,
199 |    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
200 |    See the License for the specific language governing permissions and
201 |    limitations under the License.
202 | 


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