The original post: /r/datahoarder by /u/rojo_salas on 2024-08-17 06:52:05.

Hey Guys!

If you’re using Backblaze B2 for your storage needs and want to make your URLs look more professional or customized, you can easily set up a custom subdomain to serve multiple B2 buckets. Here's a step-by-step guide on how to do this using Cloudflare.

Note: This is only based on my working knowledge and research. There may be another or better way to do this but this is my take for this. I may have said/done something wrong, feel free to correct me so I can correct this post.)

Materials Used:

• Custom Subdomain: b2.rojosalas.com (Replace with your own)
• CNAME for Backblaze: f002.backblazeb2.com (Based on your B2 Friendly URL)

Step 1: Set Up Your CNAME Record

1. Log in to Cloudflare:
   • Go to Cloudflare Dashboard and select your domain.
2. Navigate to DNS Settings:
   • Click on the DNS tab.
3. Add a CNAME Record: This CNAME setup directs requests from b2.rojosalas.com to your Backblaze B2 bucket endpoint.
   • Type: CNAME
   • Name: b2
   • Target: f002.backblazeb2.com
   • Proxy Status: Proxied (Cloudflare will handle the requests and apply your rules).

CNAME Record

Step 2: Create a Cloudflare Transform Rule

1. Navigate to Transform Rules:
   • Go to Rules > Transform Rules in the Cloudflare dashboard.
2. Create a New Transform Rule:
   • Click Create Transform Rule.
3. Configure the Rule: This rule will ensure that requests to b2.rojosalas.com will be properly mapped to the Backblaze B2 URL with the /file prefix.
   • Name: Provide a name for your rule (e.g., "Rewrite Backblaze B2 Paths").
   • When incoming requests match:
     • Expression: (http.host eq "b2.rojosalas.com") or (http.host eq "https://b2.rojosalas.com")
     • Path Matching: No separate field, include in the rule directly.
   • Rewrite URL:
     • Rewrite to: Dynamic
     • Value: concat("/file", http.request.uri.path)

Transform Rule

Example Usage

With the transform rule set up, you can now use your subdomain to access multiple buckets through the subdirectory. Here’s how it works:

• BucketA:
  • URL: https://b2.rojosalas.com/bucketA/images/pic1.png
  • Mapped to: https://f002.backblazeb2.com/file/bucketA/images/pic1.png
• BucketB:
  • URL: https://b2.rojosalas.com/bucketB/images/pic2.png
  • Mapped to: https://f002.backblazeb2.com/file/bucketB/images/pic2.png

With this setup, you can easily reference and serve files from multiple Backblaze B2 buckets under one custom subdomain.

Note: This is only based on my working knowledge and research. There may be another or better way to do this but this is my take for this. I may have said/done something wrong, feel free to correct me so I can correct this post.