fac23cb047
Since we have now a niceness gate, let's remove the known failures. Change-Id: I01684aee61e18e76f6523a466e28b8252e577f6f
123 lines
4.3 KiB
XML
123 lines
4.3 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<chapter xmlns="http://docbook.org/ns/docbook"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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version="5.0"
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xml:id="module001-ch010-vm-provisioning-indepth">
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<title>VM Provisioning Indepth</title>
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<para>More Content To be Added ...</para>
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<para>The request flow for provisioning an Instance goes like
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this:</para>
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<orderedlist>
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<listitem>
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<para>Dashboard or CLI gets the user credentials authenticates
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with Keystone via REST api.</para>
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</listitem>
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</orderedlist>
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<para>Keystone authenticate the credentials and generate & send
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back auth-token which will be used for sending request to other
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Components through REST-call.</para>
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<orderedlist>
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<listitem>
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<para>Dashboard or CLI convert the new instance request
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specified in ‘launch instance’ or ‘nova-boot’ form to REST
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API request and send it to nova-api.</para>
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</listitem>
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<listitem>
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<para>nova-api receive the request and sends the request for
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validation auth-token and access permission to
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keystone.</para>
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</listitem>
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</orderedlist>
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<para>Keystone validates the token and sends updated auth headers
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with roles and permissions.</para>
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<orderedlist>
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<listitem>
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<para>nova-api interacts with nova-database.</para>
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</listitem>
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</orderedlist>
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<para>Creates initial db entry for new instance.</para>
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<orderedlist>
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<listitem>
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<para>nova-api sends the rpc.call request to nova-scheduler
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excepting to get updated instance entry with host ID
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specified.</para>
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</listitem>
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<listitem>
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<para>nova-scheduler picks the request from the queue.</para>
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</listitem>
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<listitem>
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<para>nova-scheduler interacts with nova-database to find an
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appropriate host via filtering and weighing.</para>
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</listitem>
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</orderedlist>
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<para>Returns the updated instance entry with appropriate host ID
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after filtering and weighing.</para>
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<para>nova-scheduler sends the rpc.cast request to nova-compute for
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‘launching instance’ on appropriate host .</para>
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<orderedlist>
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<listitem>
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<para>nova-compute picks the request from the queue.</para>
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</listitem>
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<listitem>
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<para>nova-compute send the rpc.call request to nova-conductor
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to fetch the instance information such as host ID and flavor(
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Ram , CPU ,Disk).</para>
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</listitem>
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<listitem>
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<para>nova-conductor picks the request from the queue.</para>
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</listitem>
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<listitem>
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<para>nova-conductor interacts with nova-database.</para>
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</listitem>
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</orderedlist>
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<para>Return the instance information.</para>
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<para>nova-compute picks the instance information from the
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queue.</para>
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<orderedlist>
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<listitem>
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<para>nova-compute does the REST call by passing auth-token to
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glance-api to get the Image URI by Image ID from glance and
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upload image from image storage.</para>
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</listitem>
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<listitem>
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<para>glance-api validates the auth-token with keystone.</para>
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</listitem>
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</orderedlist>
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<para>nova-compute get the image metadata.</para>
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<para>nova-compute does the REST-call by passing auth-token to
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Network API to allocate and configure the network such that
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instance gets the IP address.</para>
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<orderedlist>
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<listitem>
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<para>quantum-server validates the auth-token with
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keystone.</para>
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</listitem>
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</orderedlist>
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<para>nova-compute get the network info.</para>
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<orderedlist>
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<listitem>
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<para>nova-compute does the REST call by passing auth-token to
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Volume API to attach volumes to instance.</para>
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</listitem>
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<listitem>
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<para>cinder-api validates the auth-token with keystone.</para>
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</listitem>
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</orderedlist>
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<para>nova-compute gets the block storage info.</para>
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<orderedlist>
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<listitem>
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<para>nova-compute generates data for hypervisor driver and
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executes request on Hypervisor( via libvirt or api).</para>
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</listitem>
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</orderedlist>
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<figure>
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<title>Nova VM Provisioning</title>
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<mediaobject>
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<imageobject>
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<imagedata fileref="figures/image02.png"/>
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</imageobject>
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</mediaobject>
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</figure>
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</chapter>
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