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Configuration flags

This page lists general-purpose configuration options for a Cloudflare Tunnel. You can add these flags to the cloudflared tunnel run command for remotely-managed and locally-managed tunnels.

Example: The following command runs the mytunnel tunnel by proxying traffic to port 8000 and disabling chunked transfer encoding.

cloudflared tunnel --url localhost:8000 --no-chunked-encoding run mytunnel


config value~/.cloudflared/config.yml

Specifies the path to a config file in YAML format.



Configures autoupdate frequency. See also: no-autoupdate .



Disables periodic check for updates, restarting the server with the new version. See also: autoupdate-freq . Restarts are performed by spawning a new process that connects to the Cloudflare edge. On successful connection, the old process will gracefully shut down after handling all outstanding requests.


SyntaxDefaultEnvironment Variable
origincert value~/.cloudflared/cert.pemTUNNEL_ORIGIN_CERT

Specifies the Tunnel certificate for one of your zones, authorizing the client to serve as an origin for that zone. A certificate is required to use Cloudflare Tunnel. You can obtain a certificate by using the login command or by visiting



When cloudflared receives SIGINT/SIGTERM it will stop accepting new requests, wait for in-progress requests to terminate, then shut down. Waiting for in-progress requests will timeout after this grace period, or when a second SIGTERM/SIGINT is received.


SyntaxDefaultEnvironment Variable
metrics valuelocalhost:TUNNEL_METRICS

Specifies address to query for usage metrics.


SyntaxDefaultEnvironment Variable
metrics-update-freq duration5sTUNNEL_METRICS_UPDATE_FREQ

Specifies frequency to update tunnel metrics.


SyntaxEnvironment Variable

Specifies custom tags used to identify this tunnel, in format KEY=VALUE. Multiple tags may be specified by delimiting them with commas e.g. KEY1=VALUE1, KEY2=VALUE2.


SyntaxDefaultEnvironment Variable
retries value5TUNNEL_RETRIES

Specifies the maximum number of retries for connection/protocol errors. Retries use exponential backoff (retrying at 1, 2, 4, 8, 16 seconds by default), so it is not recommended that you increase this value significantly.


SyntaxEnvironment Variable
pidfile valueTUNNEL_PIDFILE

Writes the application’s process identifier (PID) to this file after the first successful connection. Mainly useful for scripting and service integration.


SyntaxDefaultEnvironment Variable

Specifies the protocol used to establish a connection between cloudflared and the edge. Available values are auto, http2, h2mux, and quic. The auto value will automatically configure the http2 protocol.


Allows you to choose the regions to which connections are established. Omit or leave empty to connect to the global region. Set --region=us to route all connections through us region 1 and us region 2.


SyntaxEnvironment Variable
logfile valueTUNNEL_LOGFILE

Saves application log to this file. Mainly useful for reporting issues. For more details on what information you need when contacting Cloudflare support, refer to this guide .


SyntaxDefaultEnvironment Variable
loglevel valueinfoTUNNEL_LOGLEVEL

Specifies the verbosity of logging. The default info level does not produce much output, but you may wish to use the warn level in production. Available levels are: trace, debug, info, warn, error, fatal, panic.


SyntaxDefaultEnvironment Variable

Specifies the verbosity of logs for the transport between cloudflared and the Cloudflare edge. Available levels are: trace, debug, info, warn, error, fatal, panic. Any value below warn produces substantial output and should only be used to debug low-level performance issues and protocol quirks.