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doc/source/reference/properties/message-fromhost.rst
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Rainer Gerhards
doc: clarify fromhost case handling
23 июн 2026, 12:07
23 июн 2026, 12:07
1262a3e
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.. _prop-message-fromhost: .. _properties.message.fromhost: fromhost ======== .. index:: single: properties; fromhost single: fromhost .. summary-start Reports the hostname of the system from which the message was received. .. summary-end This property belongs to the **Message Properties** group. :Name: fromhost :Category: Message Properties :Type: string Description ----------- Hostname of the system the message was received from (in a relay chain, this is the system immediately in front of us and not necessarily the original sender). This is a DNS-resolved name, except if that is not possible or DNS resolution has been disabled. Reverse lookup results are cached; see :ref:`reverse_dns_cache` for controlling cache timeout. Forward lookups for outbound connections are not cached by rsyslog and are resolved via the system resolver whenever a connection is made. Case handling is input-specific. Some network inputs normalize the resolved name to lowercase for backward compatibility, while others preserve the DNS result by default. For inputs that support it, use the module or input ``PreserveCase`` parameter to choose the behavior: :ref:`imudp PreserveCase <param-imudp-preservecase>` defaults to lowercase output and :ref:`imtcp PreserveCase <param-imtcp-preservecase>` defaults to preserving case. Usage ----- .. _properties.message.fromhost-usage: .. code-block:: rsyslog template(name="example" type="list") { property(name="fromhost") } See also -------- See :doc:`../../configuration/properties` for the category overview.