How to set up a custom domain

Introduction
Skygear provides default suffixed domain .skygearapp.com for you to access your application. You can update your application to use a custom domain which owned by you instead of the skygear generated domain. 
More commands on custom domains can be found here.
Prerequisites
To setup custom domain, you need to install and configure skycli properly. Please follow this guide to setup skycli.
Setup custom domain
1. Add custom domain
$ skycli domain add <your_domain>
​
#example
$ skycli domain add www.example.com --app=myapp
2. Verify domain ownership
Add DNS records in your DNS provider
After adding the custom domain, please follow the instructions shown in the console and add dns records in your dns provider. 
#exmaple
$ skycli domain add www.example.com --app=myapp
Added domain www.example.com successfully!
​
Add following DNS records in your DNS provider.
​
TYPE      HOST                     VALUE
TXT       _skygear.example.com     <txt_record_value>
A         www.example.com          <a_record_value>
​
After updating DNS records, run `skycli domain verify www.example.com` to verify domain.
 Ask Skygear Cluster to verify the domain
$ skycli domain verify <your_domain>
​
#example
$ skycli domain verify www.example.com --app=myapp
Success! You can now access your app through www.example.com.
Your site may show a security certificate warning until the certificate has been provisioned.
After verifying the domain successfully, you can now access your application with the new domain.
3. (Optional) Setup custom certificate
Skygear Cluster by default provisions SSL certificate signed by Let's Encrypt. If you want to use your own certificate, you can update it with skycli domain update command.
# Create tls secret
$ skycli secret create <your_tls_secret_name> --type=tls --cert=<path/to/tls-cert.pem> --key=<path/to/tls-key.pem>
# Update domain to use tls secret
$ skycli domain update <your_domain> --tls-secret=<your_tls_secret_name>
​
​
#example
$ skycli secret create myapp-tls --type=tls --cert=path/to/tls-cert.pem --key=path/to/tls-key.pem --app=myapp
Success! Created secret myapp-tls
​
$ skycli domain update example.com --tls-secret=myapp-tls --app=myapp
Success! Updated domain example.com
​
$ skycli domain list --app=myapp
DOMAIN            VERIFIED         CUSTOM_CERT      REDIRECT            SSL_CERT_EXPIRY               CREATED_AT
example.com       true             true             -                   2020-11-26 20:00:00 +08:00    2020-01-01 18:00:00 +08:00
4. (Optional) Setup redirect
For some case, you may want to redirect all requests of a custom domain to another specific domain (e.g. Redirect example.com  to www.example.com).
$ skycli domain update example.com --redirect-domain=www.example.com
Success! Updated domain example.com
​
$ skycli domain list --app=myapp
DOMAIN              VERIFIED     CUSTOM_CERT      REDIRECT            SSL_CERT_EXPIRY               CREATED_AT
www.example.com     true         false            -                   -                             2019-11-26 18:00:00 +08:00
example.com         true         false            www.example.com     -                             2019-11-26 18:00:00 +08:00
​
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