Version 3

Breaking Changes

The agent: key is now required in the v3 configuration file as a parent field, and agent specific fields are nested underneath.

# example
agent:
  connect_url: connect.ngrok-agent.com:443
  authtoken: // your authtoken here
  # ...

For a complete list of fields, checkout agent configuration.

Full Example

Below is an example configuration file with all the options filled in. To activate a specific option or endpoint, simply uncomment the relevant lines by removing the # at the beginning of the line.

# ngrok Agent Configuration File v3
# https://ngrok.com/docs/agent/config/

# ######################################################################
# # Agent Configuration                                                #
# ######################################################################

# ----------------------------------------------------------------------
# | Version  (required)                                                |
# ----------------------------------------------------------------------

# Specifies the version of the config file to use. Valid options are 2 or 3.

version: 3

# ----------------------------------------------------------------------
# | Agent (authtoken, connect_url) (required)                          |
# ----------------------------------------------------------------------

# Specifies the authentication token (authtoken) and the url (connect_url) used to communicate to the
# ngrok service.
#
#  (1) You can get your default authtoken through the dashboard:
#      https://dashboard.ngrok.com/get-started/your-authtoken
#
#  (2) You can view and generate authtokens through the dashboard
#      https://dashboard.ngrok.com/tunnels/authtokens

agent:
  connect_url: connect.ngrok-agent.com:443
  authtoken: // your authtoken here

# ----------------------------------------------------------------------
# | API Key                                                            |
# ----------------------------------------------------------------------

# The ngrok API key used to connect to the ngrok API. This is nested in
# the agent
#
#  (!) This is only needed when using the ngrok api command and should
#      not be confused with the authtoken.
#
#  (1) You can obtain and manage your API Keys through the dashboard:
#      https://dashboard.ngrok.com/api-keys

#  api_key: 24yRd5U3DestCQapJrrVHLOqiAC_7RviwRqpd3wc9dKLujQZN

# ----------------------------------------------------------------------
# | Connect Timeout                                                    |
# ----------------------------------------------------------------------

# How long to wait when establishing an agent session connection to the
# ngrok service.
#
# Accepts duration, the default is 10s

#  connect_timeout: 10s

# ----------------------------------------------------------------------
# | Console UI                                                         |
# ----------------------------------------------------------------------

# Enable or disable the console UI in the terminal.
#
# Options:
#   true   - Enable the console UI.
#   false  - Disable the console UI, use structured log format.
#   iftty  - (Default) Enable UI only if standard out is a TTY.

#  console_ui: iftty

# ----------------------------------------------------------------------
# | Console UI Color                                                   |
# ----------------------------------------------------------------------

# Sets the console UI background color in the terminal.
#
# To use a color other than black, set to `transparent` and adjust your
# terminal's background.

#  console_ui_color: transparent

# ----------------------------------------------------------------------
# | CRL No Verify                                                      |
# ----------------------------------------------------------------------

# Skip Certificate Revocation List (CRL) verification if set to true.
#
# Accepts a boolean. Default is `false`.

#  crl_noverify: false

# ----------------------------------------------------------------------
# | DNS Resolver IPs                                                   |
# ----------------------------------------------------------------------

# List of DNS servers for resolving tunnel session DNS.
#
# Defaults to using the local system DNS servers.

#  dns_resolver_ips:
#    - 1.1.1.1
#    - 8.8.8.8

# ----------------------------------------------------------------------
# | Heartbeat Interval                                                 |
# ----------------------------------------------------------------------

# How often the ngrok agent should heartbeat to the ngrok servers defined
# as a duration.
#
# Accepts a duration (e.g., 10s, 1m). The default value is `10s`.

#  heartbeat_interval: 10s

# ----------------------------------------------------------------------
# | Heartbeat Tolerance                                                |
# ----------------------------------------------------------------------

# This setting defines the maximum duration to wait for a heartbeat
# response from the server before reconnecting the agent tunnel session.
#
# Accepts a duration (e.g., 10s, 1m). The default value is `15s`.

#  heartbeat_tolerance: 15s

# ----------------------------------------------------------------------
# | Inspect DB Size                                                    |
# ----------------------------------------------------------------------

# This is the upper limit in bytes on memory to allocate when saving
# requests over HTTP endpoints for inspection and reply.
#
# Accepts a numeric value. The default is `0`, equivalent to 50MB.
#
#   (!) To disable inspection for all endpoints, set the value to `-1`.

#  inspect_db_size: 52428800 # 50MB

# ----------------------------------------------------------------------
# | Log Level                                                          |
# ----------------------------------------------------------------------

# Sets the log detail level. Higher verbosity with each level.
#
# Allowed values:
#    crit  - Critical issues.
#    warn  - Warnings.
#   error  - Errors.
#    info  - (Default) Informational messages.
#   debug  - Detailed debugging info.

#  log_level: info

# ----------------------------------------------------------------------
# | Log Format                                                         |
# ----------------------------------------------------------------------

# Specifies the format of log records.
#
# Allowed values:
#   logfmt  - (Default) Human and machine-friendly key/value pairs.
#     json  - Newline-separated JSON objects.
#     term  - Colored format for TTY; otherwise, same as logfmt.

#  log_format: json

# ----------------------------------------------------------------------
# | Log                                                                |
# ----------------------------------------------------------------------

# This is the destination where ngrok should write the logs.
#
# Allowed values:
#   stdout  - write to standard out
#   stderr  - write to standard error (default)
#    false  - disable logging
#   <path>  - write log records to file path on disk

#  log: /var/log/ngrok.log

# ----------------------------------------------------------------------
# | Metadata                                                           |
# ----------------------------------------------------------------------

# Custom string included in the ngrok API response for endpoints.
#
# Maximum 4096 characters.

#  metadata: '{"serial": "00012xa-33rUtz9", "comment": "For customer alan@example.com"}'

# ----------------------------------------------------------------------
# | Proxy URL                                                          |
# ----------------------------------------------------------------------

# URL of an HTTP or SOCKS5 proxy for endpoint connections.
#
#   (!) ngrok will also respect the `http_proxy`, `http_proxy_env`, and `socks5_proxy`
#       environment variables.

#  proxy_url: socks5://localhost:9150

# ----------------------------------------------------------------------
# | Remote Management                                                  |
# ----------------------------------------------------------------------

# Allows remote management of the ngrok agent (stop, restart, update) via
# the ngrok API or Dashboard.
#
# Defaults to `true`.

#  remote_management: false

# ----------------------------------------------------------------------
# | Root CAs                                                           |
# ----------------------------------------------------------------------

# Root certificate authorities used to validate TLS connections to the
# ngrok server.
#
# Allowed values:
#    trusted - Use only the trusted certificate root for ngrok.com.
#       host - Use the root certificates trusted by the host's OS (useful for MITM proxies with DPI).
#     <path> - Path to a PEM file with additional trusted certificate authorities.

#  root_cas: trusted

# ----------------------------------------------------------------------
# | Update Channel                                                     |
# ----------------------------------------------------------------------

# Determines the stability of builds for updates.
#
#   (!) Use `stable` for any production deployments.
#
# Allowed values:
#     stable - (Default) Production-ready builds.
#   unstable - Nightly builds; may be unstable. Not for production.
#       beta - Beta builds; may be unstable. Not for production.

#  update_channel: stable

# ----------------------------------------------------------------------
# | Update Check                                                       |
# ----------------------------------------------------------------------

# Controls whether the ngrok agent checks for updates.
#
# Defaults to true.

#  update_check: false

# ----------------------------------------------------------------------
# | Web Address                                                        |
# ----------------------------------------------------------------------

# Network address to bind for the local agent web interface and API.
#
# https://ngrok.com/docs/agent/web-inspection-interface/
# https://ngrok.com/docs/agent/api/

#  web_addr: localhost:4040

# ----------------------------------------------------------------------
# | Web Allow Hosts                                                    |
# ----------------------------------------------------------------------

# List of allowed Host headers for requests to the local agent web
# interface and API. The port is stripped from the Host header before
# matching.
#
# Allowed formats:
#           8.8.8.8  - Matches exact IP in Host header (e.g., 8.8.8.8).
#   1:2:3:4:5:6:7:8  - Matches exact IPv6 in Host header.
#        10.0.0.0/8  - Matches any IP within a CIDR range.
#       example.com  - Matches exact hostname.
#      .example.com  - Matches subdomains (e.g., sub.example.com).
#
# The default only allows localhost-like Hosts (localhost, 127.0.0.1,
# ::1, etc.).

#  web_allow_hosts:
#    - 8.8.8.8
#    - example.com

# ######################################################################
# # Endpoints Configuration                                            #
# ######################################################################

# Define individual endpoints and their configurations.
#
# Each entry under 'endpoints' represents an endpoint that can be
# started using the 'ngrok start' command:
#   https://ngrok.com/docs/agent/cli/#ngrok-start
#
# To start all endpoints at once, use:
#   ngrok start --all
#
# List of common configuration fields:
#   https://ngrok.com/docs/agent/config/v3/#common-endpoint-configuration-properties
#
# List of HTTP configuration fields:
#   https://ngrok.com/docs/agent/config/v3/#http-configuration
#
# List of TCP configuration fields:
#   https://ngrok.com/docs/agent/config/v3/#tcp-configuration
#
# List of TLS endpoint configuration fields:
#   https://ngrok.com/docs/agent/config/v3/#tls-configuration

endpoints:

  # --------------------------------------------------------------------
  # | Basic Endpoint Example                                           |
  # --------------------------------------------------------------------

  # Endpoint configuration for a website protected by basic authentication
  # with a custom host header.
  #
  # Start with after uncommenting:
  #   ngrok start example-website

  # upstream protocol allows for nuanced protocol versions: http1, http2 (default http1)

  # - name: example-website
  #   metadata: foo123
  #   url: example-website.ngrok.app
  #   upstream:
  #     url: 8080
  #     protocol: http1

  # --------------------------------------------------------------------
  # | End-to-End TLS Endpoint                                          |
  # --------------------------------------------------------------------

  # Endpoint configuration for end-to-end TLS connections.
  #
  # Start with after uncommenting:
  #   ngrok start example-e2e-tls

  # - name: example-e2e-tls
  #   url: "tls://myapp.example.com"
  #   upstream:
  #     url: 9000

  # --------------------------------------------------------------------
  # | Endpoint with Traffic Policy                                     |
  # --------------------------------------------------------------------

  # Endpoint with a Traffic Policy.
  #
  # Start with after uncommenting:
  #   ngrok start example-traffic-policy
  #
  # More info:
  #   https://ngrok.com/docs/http/traffic-policy/
  #   https://ngrok.com/docs/tls/traffic-policy/
  #   https://ngrok.com/docs/tcp/traffic-policy/

  # - name: example-traffic-policy
  #   description: example traffic policy
  #   metadata: it's a traffic policy!
  #   url: myapp.ngrok.app
  #   traffic_policy:
  #     inbound:
  #        - actions:
  #          - type: custom-response
  #            config:
  #              status_code: 200
  #              content: hello, traffic policy!
  #              headers:
  #                content-type: text/plain
  #   upstream:
  #     url: 8080
  #     protocol: http1

  # --------------------------------------------------------------------
  # | SSH Access Endpoint                                              |
  # --------------------------------------------------------------------

  # Endpoint for SSH access.
  #
  # Start with:
  #   ngrok start example-ssh-access

  # - name: example-ssh-access
  #   url: "tcp://1.tcp.ngrok.io:12345"
  #   upstream:
  #     url: 22
  #     protocol: tcp

Endpoint configurations

Looking for Tunnel configurations?

Tunnel configurations are still supported in the new Version 3 configuration file format. However, they're being deprecated in favor of endpoints, which provide a simpler and more powerful way of managing ingress. If you wish to see documentation on how to enable and configure tunnels, refer to the Version 2 Tunnel Configuration section.

The most common use of the configuration file is to define endpoint configurations. Defining endpoint configurations is useful because you may then start pre-configured endpoints by name from your command line without remembering all of the right arguments every time. You may also use this method to start as many endpoints as you like from a single ngrok agent.

Endpoints are defined as mapping of name -> configuration under the endpoints: property in your configuration file.

Define two endpoints named 'httpbin' and 'demo'

endpoints:
  - name: httpbin
    url: https://alan-httpbin.ngrok.dev
  - name: demo
    url: https://demo.inconshreveable.com

Start the endpoint named 'httpbin'

ngrok start httpbin

Each endpoint you define is a map of configuration option names to values. The name of a configuration option is usually the same as its corresponding command line switch with hyphens.

eg:

• --description becomes description:
• --url becomes url:

All endpoints must define a specific url: that tells the agent where to send the traffic. Other properties are available and many are protocol-specific.

Start all endpoints defined in the configuration file

ngrok start --all

You can configure a single ngrok agent to start multiple endpoints to different services within a single agent session.

Common Endpoint Configuration Properties

url	required	forward traffic to this network address. This can be a domain example.ngrok.app, an origin https://example.ngrok.app, or a scheme shorthand https://
metadata	Optional	arbitrary user-defined metadata that will appear in the ngrok service API when listing endpoint sessions
description	Optional	arbitrary user-defined description about this endpoint that will appear in the ngrok service API when listing endpoint sessions

HTTP Configuration

circuit_breaker	Float	Reject requests when 5XX responses exceed this ratio
compression	true, false	gzip compress HTTP responses from your web service
url	Any valid domain or hostname that you have previously registered with ngrok.	The domain to request. If using a custom domain, this requires registering in the ngrok dashboard and setting a DNS CNAME value. When using wildcard domains you will need to surround the value with single quotes (domain: '*.example.com').
inspect	true, false	enable/disable the http request inspection in the web and agent API (default: true)
ip_restriction.allow_cidrs	Array of CIDRs	Rejects connections that do not match the given CIDRs
ip_restriction.deny_cidrs	Array of CIDRs	Rejects connections that match the given CIDRs and allows all other CIDRs.
mutual_tls_cas	Valid system path	The path to the TLS certificate authority to verify client certs in mutual TLS
oauth.allow_domains	Array of Strings	Allow only OAuth2 users with these email domains
oauth.allow_emails	Array of Strings	Allow only OAuth users with these emails
oauth.oauth_scopes	Array of Strings	Request these OAuth2 scopes when a user authenticates
oauth.provider	String	enforce authentication OAuth2 provider on the endpoint, e.g. 'google'. For a lit of available providers, see OAuth2 providers.
policy.inbound.name	String	policy has been renamed to traffic_policy in agent version 3.14.0.
policy.inbound.expressions	Array of Strings	policy has been renamed to traffic_policy in agent version 3.14.0.
policy.inbound.actions.type	String	policy has been renamed to traffic_policy in agent version 3.14.0.
policy.inbound.actions.config	custom	policy has been renamed to traffic_policy in agent version 3.14.0.
policy.outbound.name	String	policy has been renamed to traffic_policy in agent version 3.14.0.
policy.outbound.expressions	Array of Strings	policy has been renamed to traffic_policy in agent version 3.14.0.
policy.outbound.actions.type	String	policy has been renamed to traffic_policy in agent version 3.14.0.
policy.outbound.actions.config	custom	policy has been renamed to traffic_policy in agent version 3.14.0.
proto	http	The endpoint protocol name. This defines the type of endpoint you would like to start.
proxy_proto	String	The version of PROXY protocol to use with this endpoint, empty if not using. Example values are 1 or 2.
request_header.add	Array of key:value Strings	The headers to add to the request in the key:value format.
request_header.remove	Array of Strings	The header keys to remove from the request.
response_header.add	Array of Strings	The headers to add to the response in the key:value format.
response_header.remove	Array of Strings	The header keys to remove from the response.
traffic_policy.inbound.name	String	The name of an inbound rule that is part of a traffic policy
traffic_policy.inbound.expressions	Array of Strings	Expressions written using CEL that filter traffic the inbound policy rule applies to
traffic_policy.inbound.actions.type	String	The type of action that should be executed when this inbound policy rule is activated
traffic_policy.inbound.actions.config	custom	The configuration required for the specific type of action specified
traffic_policy.outbound.name	String	The name of an outbound rule that is part of a traffic policy
traffic_policy.outbound.expressions	Array of Strings	Expressions written using CEL that filter traffic the outbound policy rule applies to
traffic_policy.outbound.actions.type	String	The type of action that should be executed when this outbound policy rule is activated
traffic_policy.outbound.actions.config	custom	The configuration required for the specific type of action specified
user_agent_filter.allow	Array of Strings	Allows User-Agents that match against these RE2 Regular Expressions
user_agent_filter.deny	Array of Strings	Denies User-Agents that match against these RE2 Regular Expressions
verify_webhook.provider	String	Verify webhooks are signed by this provider, e.g. 'slack'. For a full list of providers, see Webhook Verification Providers.
verify_webhook.secret	String	The secret used by provider to sign webhooks, if there is one
websocket_tcp_converter	true, false	Convert ingress websocket connections to TCP upstream

TCP Configuration

ip_restriction.allow_cidrs	Array of CIDRs	Rejects connections that do not match the given CIDRs
ip_restriction.deny_cidrs	Array of CIDRs	Rejects connections that match the given CIDRs and allows all other CIDRs.
policy.inbound.name	String	policy has been renamed to traffic_policy in agent version 3.14.0.
policy.inbound.expressions	Array of Strings	policy has been renamed to traffic_policy in agent version 3.14.0.
policy.inbound.actions.type	String	policy has been renamed to traffic_policy in agent version 3.14.0.
policy.inbound.actions.config	custom	policy has been renamed to traffic_policy in agent version 3.14.0.
policy.outbound.name	String	policy has been renamed to traffic_policy in agent version 3.14.0.
policy.outbound.expressions	Array of Strings	policy has been renamed to traffic_policy in agent version 3.14.0.
policy.outbound.actions.type	String	policy has been renamed to traffic_policy in agent version 3.14.0.
policy.outbound.actions.config	custom	policy has been renamed to traffic_policy in agent version 3.14.0.
proto	tcp	The endpoint protocol name. This defines the type of endpoint you would like to start.
proxy_proto	String	The version of PROXY protocol to use with this endpoint, empty if not using. Example values are 1 or 2.
url	A valid TCP address from ngrok	bind the remote TCP address and port. These addresses can be reserved in the ngrok dashboard to use across sessions. For example: remote_addr: 2.tcp.ngrok.io:21746
traffic_policy.inbound.name	String	The name of an inbound rule that is part of a traffic policy
traffic_policy.inbound.expressions	Array of Strings	Expressions written using CEL that filter traffic the inbound policy rule applies to
traffic_policy.inbound.actions.type	String	The type of action that should be executed when this inbound policy rule is activated
traffic_policy.inbound.actions.config	custom	The configuration required for the specific type of action specified
traffic_policy.outbound.name	String	The name of an outbound rule that is part of a traffic policy
traffic_policy.outbound.expressions	Array of Strings	Expressions written using CEL that filter traffic the outbound policy rule applies to
traffic_policy.outbound.actions.type	String	The type of action that should be executed when this outbound policy rule is activated
traffic_policy.outbound.actions.config	custom	The configuration required for the specific type of action specified

TLS Configuration

mutual_tls_cas	Valid system path	The path to the TLS certificate authority to verify client certs for mutual TLS. You will also need to specify key and crt to enable mutual TLS.
crt	Valid system path	PEM TLS certificate at this path to terminate TLS traffic before forwarding locally. Requires --key to also be specified.
url	Any valid domain or hostname that you have previously registered with ngrok.	The domain to request. If using a custom domain, this requires registering in the ngrok Dashboard and setting a DNS CNAME value. When using wildcard domains you will need to surround the value with single quotes (domain: '*.example.com').
ip_restriction.allow_cidrs	Array of CIDRs	Rejects connections that do not match the given CIDRs
ip_restriction.deny_cidrs	Array of CIDRs	Rejects connections that match the given CIDRs and allows all other CIDRs.
key	Valid system path	PEM TLS private key at this path to terminate TLS traffic before forwarding locally. Requires --crt to also be specified.
policy.inbound.name	String	policy has been renamed to traffic_policy in agent version 3.14.0.
policy.inbound.expressions	Array of Strings	policy has been renamed to traffic_policy in agent version 3.14.0.
policy.inbound.actions.type	String	policy has been renamed to traffic_policy in agent version 3.14.0.
policy.inbound.actions.config	custom	policy has been renamed to traffic_policy in agent version 3.14.0.
policy.outbound.name	String	policy has been renamed to traffic_policy in agent version 3.14.0.
policy.outbound.expressions	Array of Strings	policy has been renamed to traffic_policy in agent version 3.14.0.
policy.outbound.actions.type	String	policy has been renamed to traffic_policy in agent version 3.14.0.
policy.outbound.actions.config	custom	policy has been renamed to traffic_policy in agent version 3.14.0.
proto	tls	The endpoint protocol name. This defines the type of endpoint you would like to start.
proxy_proto	String	The version of PROXY protocol to use with this endpoint, empty if not using. Example values are 1 or 2.
terminate_at	edge, agent, or upstream	Terminate at ngrok edge, agent, or upstream. Defaults to upstream unless --crt or --key are present, in which case edge is the default.
traffic_policy.inbound.name	String	The name of an inbound rule that is part of a traffic policy
traffic_policy.inbound.expressions	Array of Strings	Expressions written using CEL that filter traffic the inbound policy rule applies to
traffic_policy.inbound.actions.type	String	The type of action that should be executed when this inbound policy rule is activated
traffic_policy.inbound.actions.config	custom	The configuration required for the specific type of action specified
traffic_policy.outbound.name	String	The name of an outbound rule that is part of a traffic policy
traffic_policy.outbound.expressions	Array of Strings	Expressions written using CEL that filter traffic the outbound policy rule applies to
traffic_policy.outbound.actions.type	String	The type of action that should be executed when this outbound policy rule is activated
traffic_policy.outbound.actions.config	custom	The configuration required for the specific type of action specified

Agent Configuration

The following is a list of options that can be configured at the root of your configuration file and specify the behavior of the agent.

Name	Description
api_key	Specifies the ngrok API key used to connect to the ngrok API. This is only needed when using the ngrok api command and should not be confused with the authtoken.
authtoken	Specifies the authentication token (authtoken) used to connect to the ngrok service.
connect_interface	Set the specific network interface for ngrok to use. This is only supported on Linux platforms.
connect_timeout	How long to wait when establishing an agent session connection to the ngrok service. The default is 10s.
console_ui	Enable/disable the console UI
console_ui_color	Set the background color of the console UI
crl_noverify	Disables verifying Certificate Revocation List
dns_resolver_ips	Consult these DNS servers for tunnel session DNS resolution.
heartbeat_interval	How often the ngrok agent should heartbeat to the ngrok servers defined as a duration. Default is 10s.
heartbeat_tolerance	Reconnect the agent tunnel session if the server does not respond to a heartbeat within this tolerance defined as a duration. Default is 15s.
inspect_db_size	The size in bytes of the upper limit on memory to allocate to save requests over HTTP tunnels for inspection and replay.
log_level	Logging level of detail. In increasing order of verbosity, possible values are: crit, warn, error, info, and debug.
log_format	Format of written log records.
log	Write logs to this target destination.
metadata	Opaque, user-supplied string that will be returned as part of the ngrok API response to the list online sessions resource for all tunnels started by this agent.
proxy_url	URL of an HTTP or SOCKS5 proxy to use for establishing the tunnel connection.
region (Deprecated)	Choose the region where the ngrok agent will connect to host its tunnels.
remote_management	Set this to true to allow the ngrok agent to be remotely managed (stop, restart, update). Defaults to true.
root_cas	The root certificate authorities used to validate the TLS connection to the ngrok server.
server_addr	This is the URL of the ngrok server to connect to. You should only set this if you are using a custom ingress URL.
tunnels	A map of names to tunnel definitions. See V2 agent config tunnel definitions for more details.
update_channel	The update channel determines the stability of released builds to update to. Use stable for all production deployments.
update_check	This tells the ngrok agent if it should check for updates. Defaults to true.
version	Specifies the version of the config file to use.
web_addr	Network address to bind on for serving the local web interface and api.
web_allow_hosts	Host headers to allow access for on the local web interface and api, can be a combination of IP's, CIDR ranges, and/or hostname suffixes.

api_key

This option specifies the API key used to access the ngrok API through the ngrok api command. This is only needed when using the ngrok API and not the local ngrok agent API (available at localhost:4040/api). You can generate an API Key in the ngrok Dashboard and install it using the ngrok config add-api-key command.

ngrok.yml specifying an API key

api_key: 24yRd5U3DestCQapJrrVHLOqiAC_7RviwRqpd3wc9dKLujQZN

authtoken

This option specifies the authentication token (sometimes called tunnel credential) used to authenticate this agent when it connects to the ngrok service. After you've created an ngrok account, your dashboard will display the authtoken assigned to your account.

Your authtoken will work on multiple machines if you are just developing. When you want to deploy many agents on many devices, you can generate a unique authtoken for each device in the ngrok Dashboard or via the ngrok api credentials command.

ngrok.yml specifying an authtoken

authtoken: 4nq9771bPxe8ctg7LKr_2ClH7Y15Zqe4bWLWF9p

connect_interface

Sets the specific network interface that the ngrok agent should use. This is only supported on Linux platforms.

connect_timeout

How long to wait when establishing an agent session connection to the ngrok service. This is specified as a duration, with the default being 10s.

console_ui

This option allows you to enable or disable the console UI that is displayed in your terminal window after starting ngrok.

true		Enable the console UI
false		Disable the console UI
iftty	default	Enable the UI only if standard out is a TTY (not a file or pipe)

console_ui_color

The command sets the background color when displaying the console UI in the terminal. To choose a color other than black, set the value to transparent and change the background of your terminal window.

transparent		Don't set a background color when displaying the console UI
black	default	Set the console UI's background to black

crl_noverify

This option will skip verifying with the Certificate Revocation List if set to true. This defaults to false.

dns_resolver_ips

Consult these DNS servers for tunnel session DNS resolution. By default, the ngrok agent will use the local system DNS servers to resolve.

heartbeat_interval

How often the ngrok agent should heartbeat to the ngrok servers defined as a duration. The default is 10s.

heartbeat_tolerance

Reconnect the agent tunnel session if the server does not respond to a heartbeat within this tolerance defined as a duration. The default is 15s.

inspect_db_size

This is the upper limit in bytes on memory to allocate when saving requests over HTTP tunnels for inspection and reply. The default is 0, which means 50MB.

positive integers		size in bytes of the upper limit on memory to allocate to save requests over HTTP tunnels for inspection and replay.
0	default	use the default allocation limit, 50MB
-1		disable the inspection database; this has the effective behavior of disabling inspection for all tunnels

log_level

This is the logging level of detail. In increasing order of verbosity, possible values are: crit, warn, error, info, and debug.

log_format

This is the format of written log records.

logfmt		human and machine friendly key/value pairs
json		newline-separated JSON objects
term	default	custom colored human format if standard out is a TTY, otherwise same as logfmt

log

This is the destination where ngrok should write the logs.

stdout		write to standard out
stderr		write to standard error
false	default	disable logging
other values		write log records to file path on disk

log: /var/log/ngrok.log

metadata

This is a user-supplied custom string that will be returned as part of the ngrok API response to the list online sessions resource for all tunnels started by this agent. This is a useful mechanism to identify tunnels by your own device or customer identifier. Maximum 4096 characters.

metadata: bad8c1c0-8fce-11e4-b4a9-0800200c9a66

proxy_url

This is the URL of an HTTP or SOCKS5 proxy to use for establishing the tunnel connection. Many HTTP proxies have connection size and duration limits that will cause ngrok to fail. Like many other networking tools, ngrok will also respect the environment variable http_proxy and http_proxy_env if it is set.

region

Deprecated This is the region where the ngrok agent will connect to. You can only choose one region per agent session. Choosing the region closest to you usually improves latency and performance. By default, the ngrok agent attempts to choose the best region for you.

Region Code	Region Name
ap	Asia/Pacific (Singapore)
au	Australia (Sydney)
eu	Europe (Frankfurt)
in	India (Mumbai)
jp	Japan (Tokyo)
sa	South America (São Paulo)
us	United States (Ohio)
us-cal-1	United States (California)

remote_management

Set this to true to allow the ngrok agent to be remotely managed (stop, restart, update) via the ngrok API or the ngrok Dashboard. Defaults to true.

root_cas

This is the root certificate authorities used to validate the TLS connection to the ngrok server.

trusted	default	use only the trusted certificate root for the ngrok.com tunnel service
host		use the root certificates trusted by the host's operating system. This is helpful for working with machine-in-the-middle (MITM) proxies doing deep packet inspection (DPI).
other values		path to a certificate PEM file on disk with certificate authorities to trust

server_addr

This is the URL of the ngrok server to connect to. You should set this if you are using a custom ingress URL.

tunnels

This is a map of names to tunnel definitions. See tunnel definitions for more details.

update_channel

The update channel determines the stability of released builds to update to. Use 'stable' for all production deployments.

stable	default	These are builds that are ready to be used in production.
unstable		update to new nightly builds when available which could be broken. This should not be used in production.
beta		update to new beta builds when available which could be broken. This should not be used in production.

update_check

This tells the ngrok agent if it should check for updates. Defaults to true.

version

Specifies the version of the config file to use.

web_addr

This is the network address to bind on for serving the local agent web interface and API.

Network address		Bind to this network address
127.0.0.1:4040	default	default network address
false		disable the web UI

web_allow_hosts

These are a list of specifiers for what Host headers will be allowed to make requests agains the local agent web interface and API. Any port is stripped off the Host header before matching is performed.

Allow string		Example Host headers that would match
	default	requests to localhost-bound web interface or API endpoints are checked to have a localhost-like Host (localhost, 127.0.0.1, ::1, etc.)
8.8.8.8		an IP matches Host header (8.8.8.8)
1:2:3:4:5:6:7:8		an IPv6 matches Host header (1:2:3:4:5:6:7:8)
10.0.0.0/8		a CIDR range matches a Host header that is an IP address in that range (10.0.0.1 or 10.1.2.3)
1:2:3:4:5:6:7:8/16		a CIDR range matches a Host header that is an IPv6 address in that range (1:2:3:4:5:6:7:0)
example.com		a hostname without preceding period will match Host header exactly (example.com)
.example.com		a hostname with a preceding period Host header suffix (sub.example.com or foo.example.com)

Allow an IP address and a Domain as Host headers

web_allow_hosts:
  - 8.8.8.8
  - example.com