Evan Raw
da81fb02ec
Replace the lock file mechanism with PID+start-time based stale detection so that no cleanup is required on process death. When both org and app token locks were held, the first signal handler to call os.Exit() would kill the process before the second handler could delete its lock file. The orphaned lock file then caused the next invocation to wait ~128 seconds in an exponential backoff loop before forcibly deleting it. The same issue occurred on SIGKILL, OOM, or any non-signal death. Lock files now contain the holder's PID and process start time as JSON. On acquisition, if a lock file already exists, the recorded process is checked for liveness via gopsutil. Stale locks are reclaimed immediately with no backoff. Atomic O_CREATE|O_EXCL prevents races between concurrent acquirers. Also adds a companion .url file so processes waiting on an active lock can print the auth URL for the user.
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, install the required version of go, mentioned in the Development section below. Then you can run
make cloudflared.
User documentation for Cloudflare Tunnel can be found at https://developers.cloudflare.com/cloudflare-one/networks/connectors/cloudflare-tunnel/
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.
Development
Requirements
- GNU Make
- capnp
- go >= 1.26
- Optional tools:
Build
To build cloudflared locally run make cloudflared
Test
To locally run the tests run make test
Linting
To format the code and keep a good code quality use make fmt and make lint
Mocks
After changes on interfaces you might need to regenerate the mocks, so run make mocks
Git Hooks
To avoid CI errors, you can install pre-push hooks that run linting and tests before each push:
make install-hooks
This will configure git to use the hooks in .githooks/ that run make fmt-check lint test before each push.