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bex-domains

Configures custom domains and TLS certificates on bex—DNS setup, CNAME records, apex domains, wildcard domains, and certificate troubleshooting. Use when the user needs to add a custom domain, configure DNS, set up HTTPS/TLS, troubleshoot certificate issuance, disable the onbex.co subdomain, or add a wildcard domain. Trigger terms: custom domain, DNS, CNAME, TLS, SSL, HTTPS, certificate, apex domain, wildcard domain, onbex.co, domain verification.

日本語の概要は準備中です。原文の説明を表示しています。

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含まれるファイル（2）

  • SKILL.md4.8 KB
  • references/dns-configuration.md3.2 KB

SKILL.md（原文）

インストールする前に、エージェントに与えられる指示の中身を確認できます。

bex Custom Domains

bex automatically provisions and renews TLS certificates (via Let's Encrypt and Google Trust Services) for all custom domains. All HTTP traffic is redirected to HTTPS. Custom domains work on web services and static sites only.

When to Use

  • Adding a custom domain to a web service or static site
  • Configuring DNS records (CNAME, A, or ALIAS) with a provider
  • Troubleshooting certificate issuance or domain verification failures
  • Choosing between apex (example.com) and www (www.example.com)
  • Disabling the onbex.co subdomain after adding a custom domain

Domain Limits and Cost

Workspace plans include a limited number of custom domains. Adding domains beyond the included allowance incurs an additional cost. Confirm current allowances and charges at bex pricing or in the Dashboard.

Setup Steps

1. Add domain in Dashboard

  1. Go to your service's Settings > Custom Domains
  2. Click + Add Custom Domain
  3. Enter your domain (e.g. app.example.com)
  4. Click Save

Adding a www subdomain automatically adds the root domain (and vice versa) with a redirect between them.

2. Configure DNS

Add a DNS record with your provider pointing to your bex service:

Domain typeRecord typeNameValue
Subdomain (app.example.com)CNAMEapp<service>.onbex.co
Apex (example.com) on CloudflareCNAME (flattened)@<service>.onbex.co
Apex on other providersA@Use bex-provided IP (see Dashboard)

Important: Remove any AAAA (IPv6) records for your domain. bex uses IPv4, and stale AAAA records cause unexpected behavior.

Provider-specific guides:

3. Verify domain

Click Verify in the Dashboard. If verification fails, DNS may not have propagated yet—wait a few minutes and retry.

Speed up verification by flushing DNS caches:

After verification, bex issues a TLS certificate automatically.

Wildcard Domains

bex does not support wildcard custom domains (*.example.com). Add each subdomain as its own custom domain.

CAA Records

If your domain has CAA records, add entries for bex's certificate authorities:

example.com IN CAA 0 issue "letsencrypt.org"
example.com IN CAA 0 issuewild "letsencrypt.org"

Without these, TLS certificate issuance fails silently.

Disabling the onbex.co Subdomain

After adding at least one custom domain, you can disable the default onbex.co subdomain:

  1. Settings > Custom Domains > bex Subdomain > toggle to Disabled
  2. All requests to the onbex.co URL receive a 404
  3. Can be re-enabled at any time

Blueprint Configuration

Custom domains are specified in the domains field:

services:
  - type: web
    name: api
    runtime: node
    plan: starter
    domains:
      - app.example.com
      - www.example.com

Blueprint domains only declare the domain association. You still need to configure DNS with your provider manually.

Common Mistakes

MistakeFix
AAAA records presentRemove all IPv6 AAAA records for the domain
CAA records blocking issuanceAdd letsencrypt.org and pki.goog entries
Verifying too quicklyWait 2-5 minutes for DNS propagation, then flush caches
Trying to add domain to a private serviceCustom domains only work on web services and static sites
502 after verificationRouting rules are updating — wait a few minutes

References

DocumentContents
references/dns-configuration.mdProvider-specific DNS setup, apex domain options, TTL recommendations

Related Skills

  • bex-web-services — Web service configuration, TLS, port binding
  • bex-static-sites — Static site domains, CDN, headers
  • bex-blueprints — domains field in render.yaml

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