[DOC] Added docs for sahara+ironic
Added instructions "How to a run a Sahara cluster on Ironic" Change-Id: I888269a221b56cb8f8aab75b7556e965071c3d2b
This commit is contained in:
Evgeny Sikachev
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75a54004c5
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e552a61451
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@ -106,7 +106,7 @@ Developer Guide
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devref/plugin.spi
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devref/edp.spi
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userdoc/statuses
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userdoc/sahara_on_ironic
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**Other Resources**
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@ -0,0 +1,126 @@
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How do run a Sahara cluster on bare metal servers
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=================================================
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Hadoop clusters are designed to store and analyze extremely large amounts
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of unstructured data in distributed computing environments. Sahara enables
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you to boot Hadoop clusters in both virtual and bare metal environments.
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When Booting Hadoop clusters with Sahara on bare metal servers, you benefit
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from the bare metal performance with self-service resource provisioning.
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1. Create a new OpenStack environment using Devstack as described
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in the `Devstack Guide <http://docs.openstack.org/developer/devstack/>`_
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2. Install Ironic as described in the `Ironic Installation Guide
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<http://docs.openstack.org/developer/ironic/deploy/install-guide.html>`_
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3. Install Sahara as described in the `Sahara Installation Guide
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<http://docs.openstack.org/developer/sahara/userdoc/installation.guide.html>`_
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4. Build the Sahara image and prepare it for uploading to Glance:
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- Build an image for Sahara plugin with the ``-b`` flag. Use sahara image elements
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when building the image. See `<https://github.com/openstack/sahara-image-elements>`_
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- Convert the qcow2 image format to the raw format. For example:
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.. sourcecode:: console
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$ qemu-img convert -O raw image-converted.qcow image-converted-from-qcow2.raw
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..
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- Mount the raw image to the system.
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- ``chroot`` to the mounted directory and remove the installed grub.
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- Build grub2 from sources and install to ``/usr/sbin``.
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- In ``/etc/sysconfig/selinux``, disable selinux ``SELINUX=disabled``
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- In the configuration file, set ``onboot=yes`` and ``BOOTPROTO=dhcp``
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for every interface.
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- Add the configuration files for all interfaces in the
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``/etc/sysconfig/network-scripts`` directory.
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5. Upload the Sahara disk image to Glance, and register it in the
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Sahara Image Registry. Referencing its separate kernel and initramfs images.
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6. Configure the bare metal network for the Sahara cluster nodes:
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- Add bare metal servers to your environment manually referencing their
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IPMI addresses (Ironic does not detect servers), for Ironic to manage
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the servers power and network. For example:
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.. code-block:: bash
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$ ironic node-create -d pxe_ipmitool \
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$ -i ipmi_address=$IP_ADDRESS \
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$ -i ipmi_username=$USERNAME \
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$ -i ipmi_password=$PASSWORD \
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$ -i pxe_deploy_kernel=$deploy.kernel.id \
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$ -i pxe_deploy_ramdisk=$deploy.ramfs.id
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$ ironic port-create -n $NODE_ID -a "$MAC_eth1"
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..
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- Add the hardware information:
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.. code-block:: bash
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$ ironic node-update $NODE_ID add properties/cpus=$CPU \
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$ properties/memory_mb=$RAM properties/local_gb=$ROOT_GB \
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$ properties/cpu_arch='x86_64'
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..
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7. Add a special flavor for the bare metal instances with an arch meta
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parameter to match the virtual architecture of the server’s CPU
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with the metal one. For example:
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.. code-block:: bash
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$ nova flavor-create baremetal auto $RAM $DISK_GB $CPU
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$ nova flavor-key baremetal set cpu_arch=x86_64
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..
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Note:
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+++++
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The vCPU ad vRAM parameters (x86_64 in the example) will not be applied because
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the operating system has access to the real CPU cores and RAM. Only the root
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disk parameter is applied, and Ironic will resize the root disk partition.
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Ironic supports only a flat network topology for the bare metal provisioning,
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you must use Neutron to configure it.
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8. Launch your Sahara cluster on Ironic from the cluster template:
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* Log in to Horizon.
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* Go to Data Processing > Node Group Templates.
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* Find the templates that belong to the plugin you would like to use
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* Update those templates to use ‘bare metal’ flavor instead of the
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default one
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* Go to Data Processing > Cluster Templates.
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* Click Launch Cluster.
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* On the Launch Cluster dialog:
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* Specify the bare metal network for cluster nodes
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The cluster provisioning time is slower compared to the cluster provisioning
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of the same size that runs on VMs. Ironic does real hardware reports which
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is time consuming, and the whole root disk is filled from ``/dev/zero`` for
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security reasons.
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Known limitations:
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==================
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* Security groups are not applied.
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* When booting a nova instance with a bare metal flavor, the user can not
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provide a pre-created neutron port to ``nova boot`` command. `LP1544195
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<https://bugs.launchpad.net/nova/+bug/1544195>`_
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* Nodes are not isolated by tenants.
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* VM to Bare Metal network routing is not allowed.
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* The user has to specify the count of ironic nodes before Devstack deploys
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an Openstack.
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* The user cannot use the same image for several ironic node types.
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For example, if there are 3 ironic node types, the user has to create
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3 images and 3 flavors.
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* Multiple interfaces on a single node are not supported. Devstack configures
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only one interface.
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