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frp on fly.io

Fast reverse proxy on fly.io

Run your own frp tunnel for free (within free tier) on fly.io

Note

On 2024, fly.io will now charge $2/mo for a dedicated IPv4 address, but everything under $5 bill monthly is waved, so if you have 2 or fewer dedicated IPv4, it is still free.

Now you can have ngrok TCP/UDP tunnel with the ports you want, not randomly generated ports on ngrok unless you pay monthly.

flowchart LR
  User --> |Data Plane| frps
  frps <--> |Control Plane| frpc
  subgraph flyapp [fly.io App Server]
    frps
  end
  subgraph ServerNoPublicIP [Server without Public IP]
    frpc --> Service[TCP, UDP, or HTTP service]
  end
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fly.io Deployment

GitHub Codespaces

  1. Fork this repository.
  2. On your own fork, click Code, and click Codespaces tab.
  3. Click "Create codespace on main".
  4. Check if frp version in Dockerfile is latest, if not, change to the latest version.
  5. Login to flyctl by using fly auth login or you can generate access tokens and paste it to FLY_API_TOKEN in Codespaces secrets.
  6. Create an app on fly.io fly launch --copy-config --name <app-name> --no-deploy.
  7. When asked to tweak these settings before proceeding, enter yes if you want to tweak settings like selecting the region closest to you, otherwise, enter no.
  8. Set environment variables for frp server. fly secrets set -a <app-name> FRP_TOKEN=12345678 FRP_DASHBOARD_PWD=admin
  9. Deploy to fly.io fly deploy -a <app-name> --ha=false.
  10. When asked to allocate a dedicated IPv4 address, enter yes.
  11. Try to connect to frps using the example frpc.toml.

Local

You need flyctl installed.

  1. Clone this repository.
  2. Check if frp version in Dockerfile is latest, if not, change to the latest version.
  3. Login to flyctl by using fly auth login.
  4. Create an app on fly.io fly launch --copy-config --name <app-name> --no-deploy.
  5. When asked to tweak these settings before proceeding, enter yes if you want to tweak settings like selecting the region closest to you, otherwise, enter no.
  6. Set environment variables for frp server. fly secrets set -a <app-name> FRP_TOKEN=12345678 FRP_DASHBOARD_PWD=admin
  7. Deploy to fly.io fly deploy -a <app-name> --ha=false.
  8. When asked to allocate a dedicated IPv4 address, enter yes.
  9. Try to connect to frps using the example frpc.toml.

Don't forget to change the <app-name> and the FRP_TOKEN so that others can't use your frp tunnel.

You can also view https://<app-name>.fly.dev in your browser to view the frps dashboard.

Change server configuration

Type fly deploy -a <app-name> on the repository after editing frps.toml

Switch

fly.io runs app 24/7, if you are not using your tunnel for a while, it is recommended to suspend it to conserve free tier and resources.

  • Suspend frp fly scale count 0 -a <app-name>
  • Resume frp fly scale count 1 -a <app-name>

Patched frp to support TCP and UDP tunnel

Since in fly.io, it is required to bind to fly-global-services in order for UDP to work, but frp's proxyBindAddr only allow to bind in one address, so we patched frp to make its UDP proxy to bind to fly-global-services.

If somehow frp diverged so much that the patch gets broken, just remove the patch on Dockerfile.

Example frpc.toml

KCP Protocol

KCP (a protocol built on UDP) is used by default and to reduce latency (like for game servers).

serverAddr = "<app-name>.fly.dev"
auth.token = "12345678"

# KCP connection
serverPort = 7000
transport.protocol = "kcp"

# QUIC connection
#serverPort = 7001
#transport.protocol = "quic"

# TCP connection
#serverPort = 7000
#transport.protocol = "tcp"

# TCP tunnel
[[proxies]]
name = "Minecraft Java"
type = "tcp"
localIP = "127.0.0.1"
localPort = 25565
remotePort = 25565

# UDP tunnel
[[proxies]]
name = "Minecraft Bedrock"
type = "udp"
localIP = "127.0.0.1"
localPort = 19132
remotePort = 19132

fly.io free tier

fly.io requires a credit card in order to work, if you don't have a credit card or if you are afraid that fly.io will charge you so much, it is recommended to buy prepaid credits that can be used with virtual credit cards.

HTTP tunneling

If you are tunneling HTTP apps instead of TCP/UDP, I recommend to just use Cloudflare Tunnel.
You can also tunnel HTTP apps on this frp by using a custom port like 8080.
If you need to use standard 80 and 443 port, you need to disable the frps dashboard. Check the wiki for tutorial.

IPv6 support

If you have IPv6, congratulations, you don't need this tunnel.

To allocate IPv6 in fly.io: fly ips allocate-v6 -a <app-name>

To enable IPv6 in control plane, set bindAddr = "::" in frps.toml. Take note that KCP does not work in IPv6 as fly-global-services does not support IPv6 so you would need to use TCP if you use IPv6 in control plane.

To enable IPv6 in data plane, set proxyBindAddr = "::" in frps.toml and localIP = "::1" in frpc.toml. Take note that UDP does not work in IPv6 as fly-global-services does not support IPv6 so you can't tunnel UDP in IPv6.

More infos

🖕 Carrier-grade Network Address Translation (CGNAT)