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================
log_hosts.config
================

.. configfile:: log_hosts.config

To record HTTP transactions for different origin servers in separate log
files, you must list each origin server hostname in the
:file:`log_hosts.config` file. In addition, you must enable the `HTTP Host
Log Splitting <../working-log-files#HTTPHostLogSplitting>`_ option. You
should use the same :file:`log_hosts.config` file on every Traffic Server
node in your cluster. After you modify the :file:`log_hosts.config` file,
run the :option:`traffic_line -x` command to apply the changes.
When you apply the changes to a node in a cluster, Traffic Server automatically applies the
changes to all other nodes in the cluster.

Format
======

Each line in the :file:`log_hosts.config` file has the following format::

    hostname

where ``hostname`` is the hostname of the origin server.

.. hint::

    You can specify keywords in the :file:`log_hosts.config` file to
    record all transactions from origin servers with the specified keyword
    in their names in a separate log file. See the example below.

Examples
========

The following example configures Traffic Server to create separate log
files containing all HTTP transactions for the origin servers
``webserver1``, ``webserver2``, and ``webserver3``::

    webserver1
    webserver2
    webserver3

The following example records all HTTP transactions from origin servers
that contain ``sports`` in their names. For example:
``sports.yahoo.com`` and ``www.foxsports.com`` in a log file called
``squid-sport.log`` (the Squid format is enabled)::

    sports

