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You don't have to give up your unique, brand-centric domain names with
Firebase Hosting. You can use a custom domain (like example.com or
app.example.com) instead of a Firebase-generated domain for your
Firebase-hosted site.
Firebase Hosting provisions an SSL certificate for each of your domains
and serves your content over a global CDN.
The rest of this document walks you through these steps to connect your custom
domain.
Set up your domain for Hosting
Make sure that you've completed the "Get Started" wizard from your project's
Firebase Hosting page
so that you have a Firebase Hosting site in your Firebase project.
Step 1: Add custom domain
From your project's
Hosting page,
enter the wizard for connecting a custom domain:
If you have only one Hosting site, click Add custom domain.
Enter the custom domain name that you'd like to connect to your Hosting
site.
(Optional) Check the box to redirect all requests on the custom domain to
a second specified domain (such that example.com and
www.example.com redirect to the same content).
Click Continue to configure your DNS records and finish setting up your custom domain.
Step 2: Setup custom domain
If requested in the Connect Domain setup wizard,
verify your apex domain.
These steps ensure that your domain is not already linked with a
Firebase project and that you own the specified domain.
In your domain provider's site, locate the DNS management page.
Add and save a new record with the following inputs:
Type: Add a TXT record.
Firebase Hosting requires that you keep this TXT record continually
present in your DNS settings to prove your ownership of the domain and to
authorize Firebase to assign and renew SSL certificates for your site.
Your domain provider may list this term as "Record Type".
Proving your ownership of an apex domain, or root domain, proves your
ownership of all its subdomains.
Your domain provider may list this term as "Host Name", "Name",
or "Domain".
Value: Copy the unique verification value into the field.
Firebase Hosting checks for this value to prove your domain ownership.
Your domain provider may list this term as "Data".
Allow up to 24 hours for propagation of your updated TXT records, then click
Verify.
Note that you may click Cancel to safely close the Connect Domain
window and reopen at a later time. This does not affect the propagation
time, but you will be prompted to
re-enter your domain name when
you reopen the window.
After ample propagation time, clicking Verify in the Connect Domain
window of the Firebase console allows you to begin the SSL certificate
provisioning process.
In most cases, propagation of your records and verification of your domain
will happen within a few hours, depending on your domain provider. Refer to
your domain provider's documentation for detailed instructions for adding
TXT records and propagation times.
If clicking Verify prompts an error message, your records have not
propagated or your values may be incorrect.
In the Add Custom Domain wizard of the Firebase console, select Quick
Setup or Advanced Setup.
Quick Setup can be used for new domains that are not currently receiving
traffic or domains that you are attempting to transfer from another Hosting
site. Advanced Setup can be used if you already have a domain receiving
requests on another hosting provider and need a zero-downtime migration.
The Advanced Setup wizard will help you establish an SSL certificate and
ownership claim to allow Hosting to serve traffic on the domain before
receiving traffic.
Quick Setup
The Add Custom Domain wizard of the Firebase console
will show the necessary records that need to be updated to point your page to
Firebase Hosting. Add, remove, and save records from your domain in your
DNS provider with the following inputs:
The host you indicate is the domain on which you want to serve
content; this domain can be an apex domain or subdomain.
Your domain provider may list this term as "Host Name", "Name", or
"Domain".
Value: Assign the provided IP addresses to the value of the records.
Your domain provider may list this term as "Data", "Points To",
"Content", "Address", or "IP Address".
Allow time for your SSL certificate to be provisioned.
This may take up to 24 hours after you point your DNS to
Firebase Hosting.
In most cases, propagation of your records and
provisioning of your SSL certificate will happen within a few hours,
depending on your domain provider.
Advanced Setup
The Add Custom Domain
wizard's Advanced setup mode allows you to configure Hosting to
securely serve your domain before you direct traffic to its servers. In
general, Hosting needs three things to successfully serve traffic on a
domain:
Ownership record: a TXT record tells Hosting which Site
to serve on the domain
SSL certificate: a domain-specific
certificate that enables encrypted communication between Hosting servers
and end-users
Hosting IP records: one or more A and AAAA records
that direct all requests for the domain to Hosting servers
The Advanced setup guides you through configuring your domain
to allow Hosting to take care of the first two requirements in advance, so
that it's ready to serve the correct content before it starts receiving
traffic for your domain.
This wizard represents this process as a two-step workflow:
Prepare domain
Update DNS record(s): Add one or more records to
your domain:
Ownership: A TXT record in the form
`hosting-site=[site_id]`.
CAA (optional): A pair of CAA
records that allow Hosting's Certificate
Authorities to mint an SSL certificate for your domain. Only
present if Hosting discovers existing CAA records that prevent
it from provisioning a cert.
Setup SSL certificate: The wizard supplies an
ACME
challenge that Hosting's Certificate Authorities will use to
mint an SSL certificate for your domain. You can choose between a DNS
or HTTP challenge:
DNS challenge: Visit your domain provider's DNS
management sites. Add a TXT record with the ACME challenge
subdomain key and the provided value. Allow up to 24 hours for
propagation of your TXT records.
HTTP challenge:
Upload the provided text file to your existing site at the
specified URL and verify its existence.
Hosting will attempt to validate the ACME challenges
itself before requesting verification from its CA. If the CA fails to
validate your challenges for any reason, for example intermittent
service issues. Hosting will have to generate a new set of
challenges for you. Upon successful verification, it can take up to a
few hours for Hosting to provision an SSL certificate and allow it
to propagate.
Direct to Hosting
After Hosting establishes your domain ownership and provisions an
SSL certificate, return to your DNS provider and add DNS A/AAAA records
directing requests to Hosting:
Type: Add requested DNS A/AAAA records.
Host:
Enter your custom domain key for both records.
The host you indicate
is the domain on which you want to serve content; this domain can be an
apex domain or subdomain. Your domain provider may list this term as
"Host name", "Name", or "Domain".
Value: Assign one
value to each DNS A/AAAA record to point your domain to the specified IP
addresses.
Your domain provider may list this term as "Data", "Points
To", "Content", "Address", or "IP Address".
Wait for SSL certificate provisioning
After we verify domain ownership, we provision an SSL certificate for your
domain and deploy it across our global CDN within 24 hours after you point your
DNS A records to Firebase Hosting.
Your domain will be listed as one of the Subject Alternative Names (SAN) in the
FirebaseApp SSL certificate. You can view this certificate using the browser's
security tools. While the domain is provisioning, you might see an invalid
certificate that does not include your domain name. This is a normal part of the
process and will resolve after your domain's certificate is available.
For Advanced Setup users, your website will be hosted by your previous hosting
provider until the
setup status in your
project's
Firebase Hosting page
updates to Connected.
Your custom domain key
When adding or editing DNS records, different domain providers expect you
to enter different inputs for the Host field within their DNS management
sites. We've compiled common inputs from popular providers below.
Refer to your domain provider's documentation for detailed instructions.
Domain type
Custom domain key
Apex domain
Common inputs include:
@
The apex domain name (for example,
example.com)
Leaving the Host field blank
Subdomain
Common inputs include:
The full subdomain name
(for example, app.example.com)
Only the subdomain portion (for example, app only,
and leaving out .example.com)
Only www for the subdomain of
www.example.com
Common domain providers
Here are some common domain providers and the types of input each might require.
This information is kept up-to-date as much as possible, but refer to your
domain provider's documentation for detailed instructions.
Cloudflare
Type
Host
Value
DNS TXT record inputs
TXT
example.com
verification value provided in Firebase console
DNS A records inputs
A
example.com
199.36.158.100
A
www
199.36.158.100
Google Cloud DNS
Type
Host
Value
DNS TXT record inputs
TXT
example.com
verification value provided in Firebase console
DNS A records inputs
A
example.com
199.36.158.100
A
www
199.36.158.100
NameCheap
Type
Host
Value
DNS TXT record inputs
TXT
@
verification value provided in Firebase console
DNS A records inputs
A
@
199.36.158.100
A
www
199.36.158.100
Squarespace
Type
Host
Value
DNS TXT record inputs
TXT
@
verification value provided in Firebase console
DNS A records inputs
A
@
199.36.158.100
A
www
199.36.158.100
Setup status descriptions for custom domains
Status
Description
Needs setup
You may need to change a configuration with your DNS records.
In most cases, your DNS A records haven't propagated
from your domain name provider to Firebase Hosting servers.
Troubleshooting tip: If it's been more than 24 hours, check that
you've pointed your records to Firebase Hosting.
In rarer cases, especially if you're using the Advanced Setup
flow, SSL challenges might be failing because:
SSL certificate challenges failed, and the token (DNS TXT
records or uploaded
file provided to your site) is now invalid.
Troubleshooting tip: Click View for the domain,
then provide the new token to your existing domain.
Pending
You correctly set up your custom domain, but Firebase Hosting
hasn't provisioned an SSL certificate.
Occasionally, the following issues can stall the minting of an SSL
certificate for a custom domain:
Your CAA records are too restrictive.
Troubleshooting tip: Ensure that the certificate authorities
`letsencrypt.org` and `pki.goog` are allowed to create SSL certs for
your domain.
Your challenge code is invalid. If you're using the Advanced
Setup flow and migration failed, your token (and its challenge
code) are now invalid.
Troubleshooting tip: Click View for the domain,
then provide the new token to your existing domain.
You requested certs for too many subdomains.
Troubleshooting tip: Generally, Firebase Hosting recommends no
more than 20 subdomains on one apex custom domain, due to SSL
certificate minting limits.
Minting Certificate
An SSL certificate is being produced for your domain.
Connected
Your custom domain has the proper DNS records and has an SSL
certificate.
You can serve your site's content.
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