glances/docs/aoa/amps.rst

.. _amps:

Applications Monitoring Process
===============================

Thanks to Glances and its AMP module, you can add specific monitoring to
running processes. AMPs are defined in the Glances :ref:`configuration file<config>`.

You can disable AMP using the ``--disable-plugin amps`` option or pressing the
``A`` key.

Simple AMP
----------

For example, a simple AMP that monitor the CPU/MEM of all Python
processes can be defined as follows:

.. code-block:: ini

    [amp_python]
    enable=true
    regex=.*python.*
    refresh=3

Every 3 seconds (``refresh``) and if the ``enable`` key is true, Glances
will filter the running processes list thanks to the ``.*python.*``
regular expression (``regex``).

The default behavior for an AMP is to display the number of matching
processes, CPU and MEM:

.. image:: ../_static/amp-python.png

You can also define the minimum (``countmin``) and/or maximum
(``countmax``) process number. For example:

.. code-block:: ini

    [amp_python]
    enable=true
    regex=.*python.*
    refresh=3
    countmin=1
    countmax=2

With this configuration, if the number of running Python scripts is
higher than 2, then the AMP is displayed with a purple color (red if
less than countmin):

.. image:: ../_static/amp-python-warning.png

If the regex option is not defined, the AMP will be executed every refresh
time and the process count will not be displayed (countmin and countmax will
be ignored).

For example:

.. code-block:: ini

    [amp_conntrack]
    enable=false
    refresh=30
    one_line=false
    command=sysctl net.netfilter.nf_conntrack_count && sysctl net.netfilter.nf_conntrack_max

Note: for multiple command, please use the '&&'' separator.

For security reason, pipe is not directly allowed in a AMP command but you create a shell
script with your command:

.. code-block:: ini

    $ cat /usr/local/bin/mycommand.sh
    #!/bin/sh
    ps -aux | wc -l

and use it in the amps:

.. code-block:: ini

    [amp_amptest]
    enable=true
    regex=.*
    refresh=15
    one_line=false
    command=/usr/local/bin/mycommand.sh

User defined AMP
----------------

If you need to execute a specific command line, you can use the
``command`` option. For example, if you want to display the Dropbox
process status, you can define the following section in the Glances
configuration file:

.. code-block:: ini

    [amp_dropbox]
    # Use the default AMP (no dedicated AMP Python script)
    enable=true
    regex=.*dropbox.*
    refresh=3
    one_line=false
    command=dropbox status
    countmin=1

The ``dropbox status`` command line will be executed and displayed in
the Glances UI:

.. image:: ../_static/amp-dropbox.png

You can force Glances to display the result in one line setting
``one_line`` to true.

Embedded AMP
------------

Glances provides some specific AMP scripts (replacing the ``command``
line). You can write your own AMP script to fill your needs. AMP scripts
are located in the ``amps`` folder and should be named ``glances_*.py``.
An AMP script define an Amp class (``GlancesAmp``) with a mandatory
update method. The update method call the ``set_result`` method to set
the AMP return string. The return string is a string with one or more
line (\n between lines). To enable it, the configuration file section
should be named ``[amp_*]``.

For example, if you want to enable the Nginx AMP, the following
definition should do the job (Nginx AMP is provided by the Glances team
as an example):

.. code-block:: ini

    [amp_nginx]
    enable=true
    regex=\/usr\/sbin\/nginx
    refresh=60
    one_line=false
    status_url=http://localhost/nginx_status

Here's the result:

.. image:: ../_static/amps.png

In client/server mode, the AMP list is defined on the server side.