.. Licensed to the Apache Software Foundation (ASF) under one or more contributor license
   agreements.  See the NOTICE file distributed with this work for additional information regarding
   copyright ownership.  The ASF licenses this file to you under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with the License.  You may obtain
   a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software distributed under the License
   is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
   or implied.  See the License for the specific language governing permissions and limitations
   under the License.

.. include:: ../../common.defs

.. _traffic_ctl:

traffic_ctl
***********

Synopsis
========

:program:`traffic_ctl` [OPTIONS] SUBCOMMAND [OPTIONS]

.. _traffic-ctl-commands:

Description
===========

:program:`traffic_ctl` is used to display and manipulate configure
a running Traffic Server. :program:`traffic_ctl` includes a number
of subcommands that control different aspects of Traffic Server:

:program:`traffic_ctl alarm`
   Display and manipulate Traffic Server alarms
:program:`traffic_ctl config`
   Manipulate and display configuration records
:program:`traffic_ctl metric`
   Manipulate performance and status metrics
:program:`traffic_ctl server`
   Stop, restart and examine the server
:program:`traffic_ctl storage`
   Manipulate cache storage
:program:`traffic_ctl plugin`
   Interact with plugins.
:program:`traffic_ctl host`
   Manipulate host status.  parents for now but will be expanded to origins.

To use :program:`traffic_ctl`, :ref:`traffic_manager` needs to be running.

Options
=======

.. program:: traffic_ctl
.. option:: --debug

   Enable debugging output.

.. option:: -V, --version

   Print version information and exit.

Subcommands
===========

traffic_ctl alarm
-----------------
.. program:: traffic_ctl alarm
.. option:: list

   List all alarm events that have not been acknowledged (cleared).

.. program:: traffic_ctl alarm
.. option:: clear

   Clear (acknowledge) all current alarms.

.. program:: traffic_ctl alarm
.. option:: resolve ALARM [ALARM...]

   Clear (acknowledge) an alarm event. The arguments are a specific
   alarm number (e.g. ''1''), or an alarm string identifier (e.g.
   ''MGMT_ALARM_PROXY_CONFIG_ERROR'').

traffic_ctl config
------------------
.. program:: traffic_ctl config
.. option:: defaults [--records]

   Display the default values for all configuration records. The --records* flag has the same
   behavior as :option:`traffic_ctl config get --records`.

.. program:: traffic_ctl config
.. option:: describe RECORD [RECORD...]

   Display all the known information about a configuration record. This includes the current and
   default values, the data type, the record class and syntax checking expression.

.. program:: traffic_ctl config
.. option:: diff [--records]

   Display configuration records that have non-default values. The --records* flag has the same
   behavior as :option:`traffic_ctl config get --records`.

.. program:: traffic_ctl config
.. option:: get [--records] RECORD [RECORD...]

   Display the current value of a configuration record.

.. program:: traffic_ctl config get
.. option:: --records

   If this flag is provided, :option:`traffic_ctl config get` will emit results in
   :file:`records.config` format.

.. program:: traffic_ctl config
.. option:: match [--records] REGEX [REGEX...]

   Display the current values of all configuration variables whose names match the given regular
   expression. The *--records* flag has the same behavior as :option:`traffic_ctl config get
   --records`.

.. program:: traffic_ctl config
.. option:: reload

   Initiate a Traffic Server configuration reload. Use this command to update the running
   configuration after any configuration file modification. If no configuration files have been
   modified since the previous configuration load, this command is a no-op.

   The timestamp of the last reconfiguration event (in seconds since epoch) is published in the
   `proxy.node.config.reconfigure_time` metric.

.. program:: traffic_ctl config
.. option:: set RECORD VALUE

   Set the named configuration record to the specified value. Refer to the :file:`records.config`
   documentation for a list of the configuration variables you can specify. Note that this is not a
   synchronous operation.

.. program:: traffic_ctl config
.. option:: status

   Display detailed status about the Traffic Server configuration system. This includes version
   information, whether the internal configuration store is current and whether any daemon processes
   should be restarted.

.. _traffic-ctl-metric:

traffic_ctl metric
------------------
.. program:: traffic_ctl metric
.. option:: get METRIC [METRIC...]

   Display the current value of the specifies statistics.

.. program:: traffic_ctl metric
.. option:: match REGEX [REGEX...]

   Display the current values of all statistics whose names match
   the given regular expression.

.. program:: traffic_ctl metric
.. option:: zero METRIC [METRIC...]

   Reset the named statistics to zero.

traffic_ctl server
------------------
.. program:: traffic_ctl server
.. option:: restart

   Shut down and immediately restart Traffic Server

.. program:: traffic_ctl server restart
.. option:: --drain

   This option modifies the behavior of :option:`traffic_ctl server restart` such that
   :program:`traffic_server` is not shut down until the number of active client connections drops to
   the number given by the :ts:cv:`proxy.config.restart.active_client_threshold` configuration
   variable.

.. option:: --manager

   The default behavior of :option:`traffic_ctl server restart` is to restart
   :program:`traffic_server`. If this option is specified, :program:`traffic_manager` is also
   restarted.

.. program:: traffic_ctl server
.. option:: start

   Start :program:`traffic_server` if it is already running.

.. program:: traffic_ctl server start
.. option:: --clear-cache

   Clear the disk cache upon startup.

.. option:: --clear-hostdb

   Clear the DNS resolver cache upon startup.

.. program:: traffic_ctl server
.. option:: status

   Show the current proxy server status, indicating if we're running or not.

.. program:: traffic_ctl server
.. option:: stop

   Stop the running :program:`traffic_server` process.

.. program:: traffic_ctl server
.. option:: backtrace

   Show a full stack trace of all the :program:`traffic_server` threads.

traffic_ctl storage
-------------------
.. program:: traffic_ctl storage
.. option:: offline PATH [PATH ...]

   Mark a cache storage device as offline. The storage is identified by :arg:`PATH` which must match
   exactly a path specified in :file:`storage.config`. This removes the storage from the cache and
   redirects requests that would have used this storage to other storage. This has exactly the same
   effect as a disk failure for that storage. This does not persist across restarts of the
   :program:`traffic_server` process.

traffic_ctl plugin
-------------------
.. program:: traffic_ctl plugin
.. option:: msg TAG DATA

   Send a message to plugins. All plugins that have hooked the
   :cpp:enumerator:`TSLifecycleHookID::TS_LIFECYCLE_MSG_HOOK` will receive a callback for that hook.
   The :arg:`TAG` and :arg:`DATA` will be available to the plugin hook processing. It is expected
   that plugins will use :arg:`TAG` to select relevant messages and determine the format of the
   :arg:`DATA`.

traffic_ctl host
----------------
.. program:: traffic_ctl host

A stat to track status is created for each host. The name is the host fqdn with a prefix of
"proxy.process.host_status". The value of the stat is a string which is the serialized
representation of the status. This contains the overall status and the status for each reason.  The
stats may be viewed using the :program:`traffic_ctl metric` command or through the `stats_over_http`
endpoint.

.. option:: --time count

   Set the duration of an operation to ``count`` seconds. A value of ``0`` means no duration, the
   condition persists until explicitly changed. The default is ``0`` if an operation requires a time
   and none is provided by this option.

.. option:: --reason active | local | manual

   Sets the reason for the operation.

   ``active``
      Set the active health check reason.

   ``local``
      Set the local health check reason.

   ``manual``
      Set the administrative reason. This is the default reason if a reason is needed and not
      provided by this option.

   Internally the reason can be ``self_detect`` if
   :ts:cv:`proxy.config.http.parent_proxy.self_detect` is set to the value 2 (the default). This is
   used to prevent parent selection from creating a loop by selecting itself as the upstream by
   marking this reason as "down" in that case.

   .. note::

      The up / down status values are independent, and a host is consider available if and only if
      all of the statuses are "up".

.. option:: status HOSTNAME [HOSTNAME ...]

   Get the current status of the specified hosts with respect to their use as targets for parent
   selection. This returns the same information as the per host stat.

.. option:: down HOSTNAME [HOSTNAME ...]

   Marks the listed hosts as down so that they will not be chosen as a next hop parent. If
   :option:`--time` is included the host is marked down for the specified number of seconds after
   which the host will automatically be marked up. A host is not marked up until all reason codes
   are cleared by marking up the host for the specified reason code.

   Supports :option:`--time`, :option:`--reason`.

.. option:: up HOSTNAME [HOSTNAME ...]

   Marks the listed hosts as up so that they will be available for use as a next hop parent. Use
   :option:`--reason` to mark the host reason code. The 'self_detect' is an internal reason code
   used by parent selection to mark down a parent when it is identified as itself and


   Supports :option:`--reason`.

Examples
========

Mark down a host with `traffic_ctl` and view the associated host stats::

   $ traffic_ctl host down cdn-cache-02.foo.com --reason manual

   $ /opt/trafficserver/bin/traffic_ctl metric match host_status
   proxy.process.host_status.cdn-cache-01.foo.com HOST_STATUS_DOWN,ACTIVE:UP:0:0,LOCAL:UP:0:0,MANUAL:DOWN:1556896844:0,SELF_DETECT:UP:0
   proxy.process.host_status.cdn-cache-02.foo.com HOST_STATUS_UP,ACTIVE:UP:0:0,LOCAL:UP:0:0,MANUAL:UP:0:0,SELF_DETECT:UP:0
   proxy.process.host_status.cdn-cache-origin-01.foo.com HOST_STATUS_UP,ACTIVE:UP:0:0,LOCAL:UP:0:0,MANUAL:UP:0:0,SELF_DETECT:UP:0

In the example above, 'cdn-cache-01.foo.com' is unavailable, `HOST_STATUS_DOWN` and was marked down
for the `manual` reason, `MANUAL:DOWN:1556896844:0`, at the time indicated by the UNIX time stamp
`1556896844`.  To make the host available, one would have to clear the `manual` reason using ::

   $ traffic_ctl host up cdn-cache-01.foo.com --reason manual

Configure Traffic Server to insert ``Via`` header in the response to
the client::

   $ traffic_ctl config set proxy.config.http.insert_response_via_str 1
   $ traffic_ctl config reload

See also
========

:manpage:`records.config(5)`,
:manpage:`storage.config(5)`
