this is a post about how to deploy phoenix app to fly.io and use custom donaim with SSL support.
when you need to deploy phoenix app to the world, there are lots of choices. I choose to use fly.io, because it's easy to use and free for small business.
Deploy to Fly.io
this step is very easy, just follow this guide, when you success deploy to fly.io you can visit your app through command fly open.
Configure custom domain
although you can use your-app-name.fly.dev to visit your app, but it's nice to have your own domain. Let's do it.
Change fly.toml config
replace PHX_HOST value to your custom domain
[env]
PHX_HOST = "epona.me"
PORT = "8080"
Config A and AAAA Records
first, run flyctl ips list to see your app's addresses.
$ flyctl ips list
-------------------
TYPE ADDRESS CREATED AT
v4 77.83.143.105 2020-03-02T14:59:13Z
v6 2a09:8280:1:659f:6cb7:4925:6bfd:90a3 2020-03-02T14:59:13Z
next, Create an A record pointing to your v4 address, and an AAAA record pointing to your v6 address.
Adding the Certificate
flyctl certs create epona.me
the important part
when you check certs there is likely an message like this below.
$ flyctl certs show epona.me
---------
The certificate for epona.me has not been issued yet.
Hostname = epona.me
DNS Provider = cloudflare
Certificate Authority = Let's Encrypt
Issued =
Added to App = 1 minute ago
Source = fly
Your certificate for epona.me is being issued. Status is Awaiting certificates. Make sure to create another certificate for www.epona.me when the current certificate is issued.
because our app can't handle HTTPS, so the error shows. we need to fix that.
in config/prod.exs, add these codes
host = System.get_env("PHX_HOST") || "example.com"
config :spark, SparkWeb.Endpoint,
url: [host: host, port: 443],
force_ssl: [
host: nil,
rewrite_on: [:x_forwarded_port, :x_forwarded_proto],
hsts: true
]
commit it and then deploy, now you can successfully visit your app with custom domain.
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