Merge pull request #852 from openziti/doc_custom_domains

Doc guide for custom domains

docs/myzrok/_category_.json

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+{
+  "label": "myzrok",
+  "position": 50,
+  "link": {
+    "type": "generated-index"
+  }
+}

docs/myzrok/custom-domains/_category_.json

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+{
+  "label": "Custom Domains",
+  "position": 120,
+  "link": {
+    "type": "doc",
+    "id": "myzrok/custom-domains/index"
+  }
+}

docs/myzrok/custom-domains/index.mdx

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+---
+title: Custom Domains
+---
+
+## Overview
+[myzrok.io](https://myzrok.io) is a hosted zrok-as-a-service offering that provides a way for you bring a custom DNS name for zrok shares.
+For example, let's say you own the domain `foo.example.io`, you can leverage zrok custom domains to
+create ephemeral shares such as: `https://vw8jbg4ijz5g.foo.example.io`
+or [reserved shares](/concepts/sharing-reserved.md) such as `https://myshare.foo.example.io`.
+
+Custom domains require a Pro subscription with [myzrok.io](https://myzrok.io).
+If you don't already have an account, you can # for one [here](https://myzrok.io).
+
+[myzrok.io](https://myzrok.io) provides a guided setup with just a few easy steps!
+
+1. Bring your own custom domain name
+2. Create DNS records for certificate validation and traffic routing
+3. Wait for zrok to validate your records and finalize configuration
+4. Start sharing!
+
+Detailed setup instructions are documented below.
+
+### Prerequisites
+:::note
+In order to create a custom domain in zrok, **you must already own the domain you want to use.**
+:::
+
+During the setup process you will need to create DNS records to validate ownership and to allow a certificate to be issued
+on behalf of your domain. Once you have your domain registered, you can begin the process of setting up your custom
+domain with zrok.
+
+### Create Your Custom Domain
+
+Log into the myzrok console and access the domains page by clicking on the globe icon in the left navigation menu.
+
+![myzrok_domains_page](images/myzrok_domains_page.png)
+
+
+Click the CREATE button on the top right of the page to get started.
+When you click the create button you’ll be presented with a form to allow you to enable your custom domain.
+Enter your domain into the form field and click CREATE. This will begin the process for setting up your custom domain.
+A new managed TLS certificate will be created to host traffic on your domain's behalf.
+
+![myzrok_add_domain](images/myzrok_add_domain.png)
+
+This may take a few minutes.
+You may close the form at this time and come back when your domain is *pending validation.*
+Once your certificate is ready, you’ll be presented with instructions on how to set up your DNS records.
+
+### Creating DNS Records
+
+zrok will host and manage a TLS certificate for the custom domain on your behalf.
+This process requires a DNS validation record to be created in order to prove ownership of the domain.
+Follow the prompts in the UI to create a CNAME DNS record with the name and value specified in the UI.
+
+![myzrok_add_cname](images/myzrok_add_cname.png)
+
+Next, create an A record to direct all DNS requests for your domain to a set of static IPs that are hosted by zrok.
+
+![myzrok_add_a_record](images/myzrok_add_a_record.png)
+
+After you’ve created your records, you can verify that they are configured properly using the instructions provided in the form.
+
+![myzrok_verify_dns](images/myzrok_verify_dns.png)
+
+If the `nslookup` command returns the IP addresses supplied for the A-record entry, then DNS for your domain is resolving properly.
+
+```
+nslookup test.foo.example.io
+Server:		192.168.86.194
+Address:	192.168.86.194#53
+
+Non-authoritative answer:
+Name:	test.foo.example.io
+Address: 99.83.220.186
+Name:	test.foo.example.io
+Address: 52.223.6.108
+```
+
+Once you have created your DNS records, it will take zrok a few minutes to validate that they exist.
+You can safely close the form until your certificate has been issued.
+
+### Finalizing Your Custom Domain
+
+After your records have been validated and your certificate has been issued, click the FINALIZE button within 72 hours to complete your custom domain setup.
+
+![myzrok_finalize](images/myzrok_finalize.png)
+
+From here, myzrok.io will complete the last few steps of creating your custom domain.
+This should only take a minute, but if you need to close the form you can find the instructions on how to share your frontend when you return.
+
+### Start Sharing!
+Once the Finalize stage has completed, you can start sharing with your custom DNS.
+
+In order to create shares that utilize your custom DNS, you will need to specify the `--frontend` flag when creating a share,
+or update your environment configuration to use this new frontend by default.
+
+```
+zrok share public --frontend foo-example--goPIhgtJtz
+```
+
+You can set the custom frontend as the environment default by running:
+
+```
+zrok config set defaultFrontend foo-example--goPIhgtJtz
+```
+
+To validate which frontend is being used, use the `zrok status` command, which will identify the default frontend being used:
+
+![zrok_status](images/zrok_status.png)