ccac650f41
This updates the code-devstack slides to explain how to use systemd instead of screen. It notes that sceen is now deprecated. The exercise has been updated to use systemd instead of screen. Change-Id: Ie63249c98044b90bd64aa19a730792f26a2f7e3f Co-Authored-By: Mars Toktonaliev <mars.toktonaliev@nokia.com> Co-Authored-By: Jay S. Bryant <jsbryant@electronicjungle.net>
118 lines
3.2 KiB
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118 lines
3.2 KiB
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================
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Demo environment
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================
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.. image:: ./_assets/os_background.png
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:class: fill
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:width: 100%
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DevStack
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========
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- A bunch of scripts to build a full OpenStack environment
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- Used as
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- Demo environment
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- Part of the OpenStack project's functional testing
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- Single and multi node setup
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- Installs services from source
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- from git master by default
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- from stable branches by configuration, e.g. stable/newton
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- Documentation: http://docs.openstack.org/developer/devstack/
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DevStack Clone and Setup
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========================
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- Clone DevStack to your vm
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.. code-block:: console
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git clone https://git.openstack.org/openstack-dev/devstack
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- Make any local configurations changes (set passwords, IP addresses, etc.)
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.. code-block:: console
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cd ./devstack
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cp ./samples/local.conf .
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nano ./local.conf
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.. note::
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- Students can use a different editor instead of nano with their own
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preferences (e.g. vi, emacs, or whatever they want).
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- Run DevStack
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.. code-block:: console
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./stack.sh
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.. note::
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- DevStack should already be installed in the VM image you downloaded.
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These instructions are provided for future reference in the case that
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students need to start from scratch.
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http://localhost/
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=================
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- After DevStack is run Horizon is accessible via localhost
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.. image:: ./_assets/devstack-http-localhost.png
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:width: 100%
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Running services in DevStack
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============================
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- ``screen`` command was used to access the virtual terminals running the
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installed services
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- ``screen`` use is now deprecated
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- To use ``screen`` explicitly set ``USE_SCREEN=True`` option in
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``local.conf``
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- More details: `Developing with Devstack <https://docs.openstack.org/developer/devstack/development.html>`_
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.. image:: ./_assets/devstack-screen.png
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:width: 90%
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:align: center
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.. note::
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- Screen is going away in Queens
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: http://lists.openstack.org/pipermail/openstack-dev/2017-May/116301.html
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- Useful screen commands:
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- List sessions: screen -ls
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- Connect: screen -R <session name>
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- Start a new session: screen -C devstack/stack-screenrc
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- Move between services: <ctrl>-a n , <ctrl>-a p
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- Kill and restart a service: <ctrl>-c , <up arrow> to retrieve command
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- Disconnect: <ctrl>-a d
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DevStack services with Systemd
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==============================
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- ``systemd`` is the replacement for ``screen``
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- Services in DevStack are running as ``systemd`` units named
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devstack@$servicename.service
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- Interact with services using commands like
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``sudo systemctl <start|stop|restart> devstack@$servicename.service``
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- Follow logs with ``journalctl -f --unit devstack@$servicename.service``
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- More details: `Using Systemd in DevStack <https://docs.openstack.org/developer/devstack/systemd.html>`_
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Exercise
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========
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- Ensure you have the DevStack repository cloned to the VM where you
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would like to use it
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- Use ``systemctl status devstack@*`` to ensure devstack is running on your VM.
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If it is not started, start it with ``systemctl start devstack@*``
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- Use the ``journalctl`` command to view output from your favorite service
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- Ensure you can use commands like ``cinder`` or ``nova`` to interact with
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the services running on your VM
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