open-vault/website/source/docs/audit/file.html.md
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docs File - Audit Devices File docs-audit-file The "file" audit device writes audit logs to a file.

File Audit Device

The file audit device writes audit logs to a file. This is a very simple audit device: it appends logs to a file.

The device does not currently assist with any log rotation. There are very stable and feature-filled log rotation tools already, so we recommend using existing tools.

Sending a SIGHUP to the Vault process will cause file audit devices to close and re-open their underlying file, which can assist with log rotation needs.

Examples

Enable at the default path:

$ vault audit enable file file_path=/var/log/vault_audit.log

Enable at a different path. It is possible to enable multiple copies of an audit device:

$ vault audit enable -path="vault_audit_1" file file_path=/home/user/vault_audit.log

Configuration

Note the difference between audit enable command options and the file backend configuration options. Use vault audit enable -help to see the command options. Following are the configuration options available for the backend.

Backend configuration options
  • file_path required The path to where the audit log will be written. If this path exists, the audit backend will append to it. Specify `"stdout"` to write audit log to standard output; specify `"discard"` to discard output (useful in testing scenarios).
  • log_raw optional A string containing a boolean value ('true'/'false'), if set, logs the security sensitive information without hashing, in the raw format. Defaults to `false`.
  • hmac_accessor optional A string containing a boolean value ('true'/'false'), if set, enables the hashing of token accessor. Defaults to `true`. This option is useful only when `log_raw` is `false`.
  • mode optional A string containing an octal number representing the bit pattern for the file mode, similar to `chmod`. This option defaults to `0600`. Specifying mode of `0000` will disable Vault's setting any mode on the file.
  • format optional Allows selecting the output format. Valid values are `json` (the default) and `jsonx`, which formats the normal log entries as XML.
  • prefix optional Allows a customizable string prefix to write before the actual log line. Defaults to an empty string.