devilbox/docs/custom-container/enable-varnish.rst

.. include:: /_includes/all.rst
.. include:: /_includes/snippets/__ANNOUNCEMENTS__.rst

.. _custom_container_enable_varnish:

****************************
Enable and configure Varnish
****************************

This section will guide you through getting Varnish integrated into the Devilbox.

As Varnish itself does not handle HTTPS, its Docker Compose override definition also defines an
optional HAProxy that can be started and run in front of Varnish to provide HTTPS support and take
care of the SSL offloading before requests hit Varnish.

.. seealso::
   * |ext_lnk_varnish_github|
   * |ext_lnk_varnish_dockerhub|
   * :ref:`custom_container_enable_all_additional_container`
   * :ref:`docker_compose_override_yml_how_does_it_work`


**Table of Contents**

.. contents:: :local:


Overview
========

Available overwrites
--------------------

.. include:: /_includes/snippets/docker-compose-override-tree-view.rst


Stack settings
--------------

In case of Varnish, the file is ``compose/docker-compose.override.yml-varnish``. This file
must be copied into the root of the Devilbox git directory.

+-----------------------+------------------------------------------------------------------------------------------------------+
| What                  | How and where                                                                                        |
+=======================+======================================================================================================+
| Example compose file  | ``compose/docker-compose.override.yml-all`` or |br| ``compose/docker-compose.override.yml-varnish``  |
+-----------------------+------------------------------------------------------------------------------------------------------+

Varnish
^^^^^^^

+-----------------------+------------------------------------------------------------------------------------------------------+
| What                  | How and where                                                                                        |
+=======================+======================================================================================================+
| Container IP address  | ``172.16.238.230``                                                                                   |
+-----------------------+------------------------------------------------------------------------------------------------------+
| Container host name   | ``varnish``                                                                                          |
+-----------------------+------------------------------------------------------------------------------------------------------+
| Container name        | ``varnish``                                                                                          |
+-----------------------+------------------------------------------------------------------------------------------------------+
| Mount points          | none                                                                                                 |
+-----------------------+------------------------------------------------------------------------------------------------------+
| Exposed port          | ``6081`` (can be changed via ``.env``)                                                               |
+-----------------------+------------------------------------------------------------------------------------------------------+
| Available at          | ``http://localhost:6081`` (or via ``http:<project>.<TLD>:6081``)                                     |
+-----------------------+------------------------------------------------------------------------------------------------------+
| Further configuration | none                                                                                                 |
+-----------------------+------------------------------------------------------------------------------------------------------+

HAProxy
^^^^^^^

+-----------------------+------------------------------------------------------------------------------------------------------+
| What                  | How and where                                                                                        |
+=======================+======================================================================================================+
| Container IP address  | ``172.16.238.231``                                                                                   |
+-----------------------+------------------------------------------------------------------------------------------------------+
| Container host name   | ``haproxy``                                                                                          |
+-----------------------+------------------------------------------------------------------------------------------------------+
| Container name        | ``haproxy``                                                                                          |
+-----------------------+------------------------------------------------------------------------------------------------------+
| Mount points          | none                                                                                                 |
+-----------------------+------------------------------------------------------------------------------------------------------+
| Exposed port          | ``8080`` for HTTP and ``8443`` for HTTPS (can be changed via ``.env``)                               |
+-----------------------+------------------------------------------------------------------------------------------------------+
| Available at          | ``http://localhost:8080``, ``http://localhost:8443`` (or via ``http:<project>.<TLD>:8080|8443``)     |
+-----------------------+------------------------------------------------------------------------------------------------------+
| Further configuration | none                                                                                                 |
+-----------------------+------------------------------------------------------------------------------------------------------+

Stack env variables
-------------------

Additionally the following ``.env`` variables can be created for easy configuration:

Varnish
^^^^^^^

+------------------------------+-----------------------------------------------+--------------------------------------------------------------------+
| Variable                     | Default value                                 | Description                                                        |
+==============================+===============================================+====================================================================+
| ``HOST_PORT_VARNISH``        | ``6081``                                      | Controls the host port on which Varnish will be available at.      |
+------------------------------+-----------------------------------------------+--------------------------------------------------------------------+
| ``VARNISH_SERVER``           | ``6``                                         | Controls the Varnish version to use.                               |
+------------------------------+-----------------------------------------------+--------------------------------------------------------------------+
| ``VARNISH_CONFIG``           | ``/etc/varnish/default.vcl``                  | Path to Varnish configuration file (custom config can be mounted). |
+------------------------------+-----------------------------------------------+--------------------------------------------------------------------+
| ``VARNISH_CACHE_SIZE``       | ``128m``                                      | Varnish Cache size.                                                |
+------------------------------+-----------------------------------------------+--------------------------------------------------------------------+
| ``VARNISH_PARAMS``           | ``-p default_ttl=3600 -p default_grace=3600`` | Additional Varnish startup parameter.                              |
+------------------------------+-----------------------------------------------+--------------------------------------------------------------------+

HAProxy
^^^^^^^

+------------------------------+-----------------------------------------------+-------------------------------------------------------------------------------+
| Variable                     | Default value                                 | Description                                                                   |
+==============================+===============================================+===============================================================================+
| ``HOST_PORT_HAPROXY``        | ``8080``                                      | Controls the host port on which HTTP requests will be available for HAProxy.  |
+------------------------------+-----------------------------------------------+-------------------------------------------------------------------------------+
| ``HOST_PORT_HAPROXY_SSL``    | ``8443``                                      | Controls the host port on which HTTPS requests will be available for HAProxy. |
+------------------------------+-----------------------------------------------+-------------------------------------------------------------------------------+

Instructions
============

1. Copy docker-compose.override.yml
-----------------------------------

Copy the Varnish Docker Compose overwrite file into the root of the Devilbox git directory.
(It must be at the same level as the default ``docker-compose.yml`` file).

.. code-block:: bash

   host> cp compose/docker-compose.override.yml-varnish docker-compose.override.yml

.. seealso::
   * :ref:`docker_compose_override_yml`
   * :ref:`add_your_own_docker_image`
   * :ref:`overwrite_existing_docker_image`


2. Adjust ``.env`` settings (optional)
--------------------------------------

Varnish and HAProxy are using sane defaults, which can be changed by adding variables to the
``.env`` file and assigning custom values.

Add the following variables to ``.env`` and adjust them to your needs:

.. code-block:: bash
   :caption: .env

   # Varnish version to choose
   #VARNISH_SERVER=4
   #VARNISH_SERVER=5
   VARNISH_SERVER=6

   # Varnish settings
   VARNISH_CONFIG=/etc/varnish/default.vcl
   VARNISH_CACHE_SIZE=128m
   VARNISH_PARAMS=-p default_ttl=3600 -p default_grace=3600
   HOST_PORT_VARNISH=6081

   # HAProxy settings
   HOST_PORT_HAPROXY=8080
   HOST_PORT_HAPROXY_SSL=8443


.. seealso:: :ref:`env_file`


3. Custom Varnish config (optional)
-----------------------------------

Varnish comes with a pretty generic default configuration that should fit most frameworks or CMS's.
If you do however want to provide your own custom Varnish configuration, you can do so for each
Varnish version separately.

1. Place any ``*.vcl`` files in to the Varnish configuration directories (found in ``cfg/``).

.. code-block:: bash

   host> tree -L 1 cfg/ | grep varnish
   ├── varnish-4
   ├── varnish-5
   ├── varnish-6

2. The ``varnish-X/`` directory will be mounted into ``/etc/varnish.d/`` into the running Varnish container
3. Adjust the ``VARNISH_CONFIG`` variable to point to your custom Varnish config file.

3.1 Example
^^^^^^^^^^^

For this example we will assume you are using  Varnish 6

1. Add ``my-varnish.vcl`` into ``cfg/varnish-6/``
2. Set ``VARNISH_CONFIG`` to ``/etc/varnish.d/my-varnish.vcl``
3. Ensure that the Backend server points to ``httpd`` in your custom varnish config
4. Ensure that the Backend port points to ``80`` in your custom varnish config


4. Start the Devilbox
---------------------

The final step is to start the Devilbox with Varnish.

.. seealso:: :ref:`start_the_devilbox`

4.1 Varnish only
^^^^^^^^^^^^^^^^

Let's assume you want to start ``php``, ``httpd``, ``bind``, ``varnish``.

.. code-block:: bash

   host> docker-compose up -d php httpd bind varnish

4.2 HTTPS offloading with HAProxy in front of Varnish
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

If you also want full HTTPS support, simply start HAproxy as well with Varnish.

.. code-block:: bash

   host> docker-compose up -d php httpd bind haproxy varnish


TL;DR
=====

For the lazy readers, here are all commands required to get you started.
Simply copy and paste the following block into your terminal from the root of your Devilbox git
directory:

.. code-block:: bash

   # Copy compose-override.yml into place
   cp compose/docker-compose.override.yml-varnish docker-compose.override.yml

   # Create .env variable
   echo "# Varnish version to choose"                               >> .env
   echo "#VARNISH_SERVER=4"                                         >> .env
   echo "#VARNISH_SERVER=5"                                         >> .env
   echo "VARNISH_SERVER=6"                                          >> .env
   echo "# Varnish settings"                                        >> .env
   echo "VARNISH_CONFIG=/etc/varnish/default.vcl"                   >> .env
   echo "VARNISH_CACHE_SIZE=128m"                                   >> .env
   echo "VARNISH_PARAMS=-p default_ttl=3600 -p default_grace=3600"  >> .env
   echo "HOST_PORT_VARNISH=6081"                                    >> .env
   echo "# HAProxy settings"                                        >> .env
   echo "HOST_PORT_HAPROXY=8080"                                    >> .env
   echo "HOST_PORT_HAPROXY_SSL=8443"                                >> .env

   # Start container
   docker-compose up -d php httpd bind varnish