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When closing a session, there are two possible signals that will occur, one from the outside, indicating that the session is idle and needs to be closed, and the internal error condition that will be unblocked with a net.ErrClosed when the connection underneath is closed. Both of these routines write to the session's closeChan. Once the reader for the closeChan reads one value, it will immediately return. This means that the channel is a one-shot and one of the two writers will get stuck unless the size of the channel is increased to accomodate for the second write to the channel. With the channel size increased to two, the second writer (whichever loses the race to write) will now be unblocked to end their go routine and return. Closes TUN-8817
Cloudflare Tunnel client
Contains the command-line client for Cloudflare Tunnel, a tunneling daemon that proxies traffic from the Cloudflare network to your origins.
This daemon sits between Cloudflare network and your origin (e.g. a webserver). Cloudflare attracts client requests and sends them to you
via this daemon, without requiring you to poke holes on your firewall --- your origin can remain as closed as possible.
Extensive documentation can be found in the Cloudflare Tunnel section of the Cloudflare Docs.
All usages related with proxying to your origins are available under cloudflared tunnel help.
You can also use cloudflared to access Tunnel origins (that are protected with cloudflared tunnel) for TCP traffic
at Layer 4 (i.e., not HTTP/websocket), which is relevant for use cases such as SSH, RDP, etc.
Such usages are available under cloudflared access help.
You can instead use WARP client
to access private origins behind Tunnels for Layer 4 traffic without requiring cloudflared access commands on the client side.
Before you get started
Before you use Cloudflare Tunnel, you'll need to complete a few steps in the Cloudflare dashboard: you need to add a website to your Cloudflare account. Note that today it is possible to use Tunnel without a website (e.g. for private routing), but for legacy reasons this requirement is still necessary:
Installing cloudflared
Downloads are available as standalone binaries, a Docker image, and Debian, RPM, and Homebrew packages. You can also find releases here on the cloudflared GitHub repository.
- You can install on macOS via Homebrew or by downloading the latest Darwin amd64 release
- Binaries, Debian, and RPM packages for Linux can be found here
- A Docker image of
cloudflaredis available on DockerHub - You can install on Windows machines with the steps here
- To build from source, first you need to download the go toolchain by running
./.teamcity/install-cloudflare-go.shand follow the output. Then you can runmake cloudflared
User documentation for Cloudflare Tunnel can be found at https://developers.cloudflare.com/cloudflare-one/connections/connect-apps
Creating Tunnels and routing traffic
Once installed, you can authenticate cloudflared into your Cloudflare account and begin creating Tunnels to serve traffic to your origins.
- Create a Tunnel with these instructions
- Route traffic to that Tunnel:
- Via public DNS records in Cloudflare
- Or via a public hostname guided by a Cloudflare Load Balancer
- Or from WARP client private traffic
TryCloudflare
Want to test Cloudflare Tunnel before adding a website to Cloudflare? You can do so with TryCloudflare using the documentation available here.
Deprecated versions
Cloudflare currently supports versions of cloudflared that are within one year of the most recent release. Breaking changes unrelated to feature availability may be introduced that will impact versions released more than one year ago. You can read more about upgrading cloudflared in our developer documentation.
For example, as of January 2023 Cloudflare will support cloudflared version 2023.1.1 to cloudflared 2022.1.1.