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Config: Transport Section
Some Fluentd input, output, and filter plugins, that use server/http_server plugin helper, also support the <transport> section to specify how to handle the connections.

Transport Section Overview

The transport section must be under <match>, <source>, and <filter> sections. It specifies the transport protocol, version, and certificates.
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# tcp
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<transport tcp>
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</transport>
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# udp
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<transport udp>
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</transport>
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# tls
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<transport tls>
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cert_path /path/to/fluentd.crt
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private_key_path /path/to/fluentd.key
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private_key_passphrase YOUR_PASSPHRASE
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# ...
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</transport>
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Parameters

  • protocol [enum: tcp/udp/tls]
    • Default: tcp

TLS Setting

  • version: [enum: TLS1_1/TLS1_2/TLS1_3]
    • Default: TLSv1_2
  • min_version: [enum: TLS1_1/TLS1_2/TLS1_3]
    • Default: nil
    • Specifies the lower bound of the supported SSL/TLS protocol.
  • max_version: [enum: TLS1_1/TLS1_2/TLS1_3]
    • Default: nil
    • Specifies the upper bound of the supported SSL/TLS protocol.
  • ciphers [string]
    • Default: "ALL:!aNULL:!eNULL:!SSLv2"
    • OpenSSL 1.0.0 or higher default.
  • insecure [bool]
    • Default: false (uses secure connection with tls)
If you want to accept multiple TLS protocols, use min_version/max_version instead of version. To support the old style, fluentd accepts TLS1_1 and TLSv1_1 values.
NOTE: TLS1_3 is available when your system supports TLS 1.3.

Signed Public CA Parameters

For <transport tls>:
  • ca_path: [string]
    • Default: nil
    • Specifies the path of CA certificate file
  • cert_path: [string]
    • Default: nil
    • Specifies the path of Certificate file
  • private_key_path: [string]
    • Default: nil
    • Specifies the path of Private Key file
  • private_key_passphrase: [string]
    • Default: nil
    • Specifies the public CA private key passphrase
  • client_cert_auth: [bool]
    • Default: false
    • If true, Fluentd will check all the incoming HTTPS requests for a
      client certificate signed by the trusted CA. The requests that don't
      supply a valid client certificate will fail.
  • cert_verifier: [string]
    • Default: nil
    • Specifies the code path for cert verification. See also [server
      article](/developer/api-plugin-helper-server.md#cert_verifier-example).

Generated and Signed by Private CA Parameters

For <transport tls>:
  • ca_cert_path: [string]
    • Default: nil
    • Specifies the private CA cert path
  • ca_private_key_path: [string]
    • Default: nil
    • Specifies the private CA private key path
  • ca_private_key_passphrase: [string]
    • Default: nil
    • Specifies the private CA private key passphrase

Generated and Signed by Private CA Certs or Self-signed Parameters

For <transport tls>:
  • generate_private_key_length: [integer]
    • Default: 2048
  • generate_cert_country: [string]
    • Default: US
  • generate_cert_state: [string]
    • Default: CA
  • generate_cert_locality: [string]
    • Default: Mountain View
  • generate_cert_common_name: [string]
    • Default: nil
  • generate_cert_expiration: [integer]
    • Default: (60 * 60 * 24 = 86400) * 365 * 10 = 10 years

Cert Digest Algorithm Parameter

For <transport tls>:
  • generate_cert_digest: [enum: sha1/sha256/sha384/sha512]
    • Default: sha256
If this article is incorrect or outdated, or omits critical information, please let us know. Fluentd is an open-source project under Cloud Native Computing Foundation (CNCF). All components are available under the Apache 2 License.