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HTTP Proxy

Enable traffic through a proxy server using the HTTP_PROXY environment variable.

Fluent Bit supports configuring an HTTP proxy for all egress HTTP/HTTPS traffic using the HTTP_PROXY or http_proxy environment variable.

The format for the HTTP proxy environment variable is http://USER:PASS@HOST:PORT, where:

  • USER is the username when using basic authentication.

  • PASS is the password when using basic authentication.

  • HOST is the HTTP proxy hostname or IP address.

  • PORT is the port the HTTP proxy is listening on.

To use an HTTP proxy with basic authentication, provide the username and password:

HTTP_PROXY='http://example_user:example_pass@proxy.example.com:8080'

When no authentication is required, omit the username and password:

HTTP_PROXY='http://proxy.example.com:8080'

The HTTP_PROXY environment variable is a standard way of setting a HTTP proxy in a containerized environment, and it's also natively supported by any application written in Go. Fluent Bit implements the same convention. The http_proxy environment variable is also supported. When both the HTTP_PROXY and http_proxy environment variables are provided, HTTP_PROXY will be preferred.

The HTTP output plugin also supports configuring an HTTP proxy. This configuration works, but shouldn't be used with the HTTP_PROXY or http_proxy environment variable. The environment variable-based proxy configuration is implemented by creating a TCP connection tunnel using HTTP CONNECT. Unlike the plugin's implementation, this supports both HTTP and HTTPS egress traffic.

NO_PROXY

Use the NO_PROXY environment variable when traffic shouldn't flow through the HTTP proxy. The no_proxy environment variable is also supported. When both NO_PROXY and no_proxy environment variables are provided, NO_PROXY takes precedence.

The format for the no_proxy environment variable is a comma-separated list of host names or IP addresses.

A domain name matches itself and all of its subdomains (for example, example.com matches both example.com and test.example.com):

NO_PROXY='foo.com,127.0.0.1,localhost'

A domain with a leading dot (.) matches only its subdomains (for example, .example.com matches test.example.com but not example.com):

NO_PROXY='.example.com,127.0.0.1,localhost'

As an example, you might use NO_PROXY when running Fluent Bit in a Kubernetes environment, where and you want:

  • All real egress traffic to flow through an HTTP proxy.

  • All local Kubernetes traffic to not flow through the HTTP proxy.

In this case, set:

NO_PROXY='127.0.0.1,localhost,kubernetes.default.svc'

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