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172 lines
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ReStructuredText
172 lines
5.7 KiB
ReStructuredText
.. include:: /_includes/all.rst
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.. _connect_to_host_os:
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******************
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Connect to host OS
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******************
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This section explains how to connect from inside a Devilbox container to the host operating system.
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**Table of Contents**
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.. contents:: :local:
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Prerequisites
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=============
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When you want to connect from inside a Docker container to a port on your host operating system,
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ensure the host service is listening on all interfaces for simplicity.
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The following sections will give you the IP address and/or the CNAME where the host os can be
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reached from within a container.
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.. _connect_to_host_os_docker_on_linux:
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Docker on Linux
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===============
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If you run Docker on Linux the host IP is always ``172.16.238.1``, which is the default gateway
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IP address within the Devilbox bridge network (see ``docker-compose.yml``).
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.. important:: Ensure services on the host listen on that IP address or on all interfaces.
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By default Docker on Linux does not have CNAME's of the host computer as for example with MacOS
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or Windows, therefore two custom CNAME's have been added by the Devilbox in order to emulate the
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same behaviour:
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* CNAME: ``docker.for.lin.host.internal``
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* CNAME: ``docker.for.lin.localhost``
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.. _connect_to_host_os_docker_for_mac:
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Docker for Mac
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==============
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If you run Docker for Mac, an IP address is not necessary as it already provides a CNAME which will
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always point to the IP address of your host operating system. Depending on the Docker version this
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CNAME will differ:
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Docker 18.03.0-ce+ and Docker compose 1.20.1+
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---------------------------------------------
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CNAME: ``host.docker.internal``
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Docker 17.12.0-ce+ and Docker compose 1.18.0+
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---------------------------------------------
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CNAME: ``docker.for.mac.host.internal``
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Docker 17.06.0-ce+ and Docker compose 1.14.0+
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---------------------------------------------
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CNAME: ``docker.for.mac.localhost``
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.. _connect_to_host_os_docker_for_win:
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Docker for Windows
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==================
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If you run Docker for Windows, an IP address is not necessary as it already provides a CNAME which will
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always point to the IP address of your host operating system. Depending on the Docker version this
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CNAME will differ:
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.. important:: Ensure your firewall is not blocking Docker to host connections.
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Docker 18.03.0-ce+ and Docker compose 1.20.1+
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---------------------------------------------
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* CNAME: ``docker.for.win.host.internal``
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* CNAME: ``host.docker.internal``
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Docker 17.06.0-ce+ and Docker compose 1.14.0+
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---------------------------------------------
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CNAME: ``docker.for.win.host.localhost``
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Docker Toolbox
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==============
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.. note:: This section applies for both, Docker Toolbox on MacOS and Docker Toolbox on Windows.
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Docker Toolbox behaves the same way as Docker on Linux, with one major difference.
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The Devilbox IP address or the custom provided CNAMEs actually refer to the Docker Toolbox machine.
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In order to connect from inside the Docker container (which is inside the Docker Toolbox machine)
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to your host os, you need to create:
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1. either a **local** port-forward on the **Docker Toolbox** machine (``ssh -L``)
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2. or a **remote** port-forward on your **host os** (``ssh -R``)
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.. seealso:: |ext_lnk_ssh_tunnelling_for_fun_and_profit|
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For both examples we assume the following:
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* MySQL database exists on your host os and listens on ``127.0.0.1`` on port ``3306``
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* Docker Toolbox IP address is ``192.168.99.100``
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* Host IP address where SSH is listening on ``172.16.0.1``
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* Host SSH username is ``user``
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* Devilbox Docker container wants to access MySQL on host os
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Local port forward on Docker Toolbox
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------------------------------------
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.. important::
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For that to work, your host operating system requires an SSH server to be up and running.
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+----------------+----------------+--------------+--------------------+--------------+
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| Initiator | From host | From port | To host | To port |
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+================+================+==============+====================+==============+
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| Docker Toolbox | ``127.0.0.1`` | ``3306`` | ``192.168.99.100`` | ``3306`` |
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+----------------+----------------+--------------+--------------------+--------------+
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.. code-block:: bash
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# From Docker Toolbox forward port 3306 (on host 172.16.0.1) to myself (192.168.99.100)
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toolbox> ssh -L 3306:127.0.0.1:3306 user@172.16.0.1
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.. seealso::
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* :ref:`howto_find_docker_toolbox_ip_address`
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* :ref:`howto_ssh_into_docker_toolbox`
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* :ref:`howto_ssh_port_forward_on_docker_toolbox_from_host`
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Remote port-forward on host os
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------------------------------
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.. important::
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For that to work, your host operating system requires an SSH client (``ssh`` binary).
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+----------------+----------------+--------------+--------------------+--------------+
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| Initiator | From host | From port | To host | To port |
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+================+================+==============+====================+==============+
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| Host os | ``127.0.0.1`` | ``3306`` | ``192.168.99.100`` | ``3306`` |
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+----------------+----------------+--------------+--------------------+--------------+
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.. code-block:: bash
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# From host os forward port 3306 (from loopback 127.0.0.1) to Docker Toolbox (192.168.99.100)
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host> ssh -R 3306:127.0.0.1:3306 docker@192.168.99.100
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.. seealso::
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* :ref:`howto_find_docker_toolbox_ip_address`
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* :ref:`howto_ssh_into_docker_toolbox`
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* :ref:`howto_ssh_port_forward_on_host_to_docker_toolbox`
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Post steps
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----------
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With either of the above you have achieved the exact behaviour as
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:ref:`connect_to_host_os_docker_on_linux` for one single service/port (MySQL port 3306).
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You must now follow the steps for :ref:`connect_to_host_os_docker_on_linux` to actually connect
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to that service from within the Devilbox Docker container.
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