2018-06-29 21:57:59 +08:00
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.. _static_ip:
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Using a static IP address
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#########################
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When you install ACRN on your system following the :ref:`getting_started`, a
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bridge called ``acrn-br0`` will be created and attached to the Ethernet network
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interface of the platform. By default, the bridge gets its network configuration
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using DHCP. This guide will explain how to modify the system to use a static IP
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address. You need ``root`` privileges to make these changes to the system.
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ACRN Network Setup
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******************
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The ACRN Service OS is based on `Clear Linux`_ and it uses `systemd-networkd`_
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to set up the Service OS networking. A few files are responsible for setting up the
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ACRN bridge (``acrn-br0``), the TAP device (``acrn_tap0``), and how these are all
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connected. Those files are installed in ``/usr/lib/systemd/network``
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on the target device and can also be found under ``tools/acrnbridge`` in the source code.
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Setting up the static IP address
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********************************
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2018-07-01 02:42:33 +08:00
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You can set up a static IP address by copying the
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``/usr/lib/systemd/network/50-eth.network`` file to
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``/etc/systemd/network/`` directory. You can create this directory and
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copy the file with the following command:
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.. code-block:: console
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mkdir -p /etc/systemd/network
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cp /usr/lib/systemd/network/50-eth.network /etc/systemd/network
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Modify the ``[Network]`` section in the
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``/etc/systemd/network/50-eth.network`` file you just created.
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This is the content of the file used in ACRN by default.
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2018-06-29 21:57:59 +08:00
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.. literalinclude:: ../../tools/acrnbridge/eth.network
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:caption: tools/acrnbridge/eth.network
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:emphasize-lines: 5
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Edit the file to remove the line highlighted above and add your network settings in
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that ``[Network]`` section. You will typically need to add the ``Address=``, ``Gateway=``
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and ``DNS=`` parameters in there. There are many more parameters that can be used and
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detailing them is beyond the scope of this document. For an extensive list of those,
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please visit the official `systemd-network`_ page.
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This is an example of what a typical ``[Network]`` section would look like, specifying
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a static IP address:
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.. code-block:: none
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[Network]
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Address=192.168.1.87/24
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Gateway=192.168.1.254
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DNS=192.168.1.254
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Activate the new configuration
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******************************
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You do not need to reboot the machine after making the changes to the system, the
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following steps that restart the ``systemd-networkd`` service will suffice (run as ``root``):
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.. code-block:: console
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systemctl daemon-reload
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systemctl restart systemd-networkd
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If you encounter connectivity issues after following this guide, please contact us on the
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`ACRN-users mailing list`_ or file an issue in `ACRN hypervisor issues`_. Provide the details
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of the configuration you are trying to set up, the modifications you have made to your system, and
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the output of ``journalctl -b -u systemd-networkd`` so we can best assist you.
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.. _systemd-networkd: https://www.freedesktop.org/software/systemd/man/systemd-networkd.service.html
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.. _Clear Linux: https://clearlinux.org
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.. _systemd-network: https://www.freedesktop.org/software/systemd/man/systemd.network.html
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.. _ACRN-users mailing list: https://lists.projectacrn.org/g/acrn-users
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.. _ACRN hypervisor issues: https://github.com/projectacrn/acrn-hypervisor/issues
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