Merge "docs: re-organise the API concept docs"
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@ -1,17 +1,12 @@
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====================================
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General Compute API v2.0 information
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====================================
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=========================
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Key Compute API Concepts
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=========================
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The OpenStack Compute API is defined as a ReSTful HTTP service. The API
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takes advantage of all aspects of the HTTP protocol (methods, URIs,
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media types, response codes, etc.) and providers are free to use
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existing features of the protocol such as caching, persistent
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connections, and content compression among others. For example,
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providers who employ a caching layer may respond with a 203 when a
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request is served from the cache instead of a 200. Additionally,
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providers may offer support for conditional **GET** requests using
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ETags, or they may send a redirect in response to a **GET** request.
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Clients should be written to account for these differences.
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connections, and content compression among others.
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Providers can return information identifying requests in HTTP response
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headers, for example, to facilitate communication between the provider
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@ -23,27 +18,8 @@ disk space, and CPU, and can be provisioned in minutes. Interactions
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with Compute Servers can happen programmatically with the OpenStack
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Compute API.
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We welcome feedback, comments, and bug reports at
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`bugs.launchpad.net/nova <http://bugs.launchpad.net/nova>`__.
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Intended audience
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-----------------
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This guide assists software developers who want to develop applications
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using the OpenStack Compute API. To use this information, you should
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have access to an account from an OpenStack Compute provider, and you
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should also be familiar with the following concepts:
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- OpenStack Compute service
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- ReSTful web services
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- HTTP/1.1
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- JSON data serialization formats
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Concepts
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--------
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User Concepts
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==============
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To use the OpenStack Compute API effectively, you should understand
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several key concepts:
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@ -51,7 +27,11 @@ several key concepts:
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- **Server**
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A virtual machine (VM) instance in the compute system. Flavor and
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image are requisite elements when creating a server.
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image are requisite elements when creating a server. A name for the server
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is also required.
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For more details, such as server actions and server metadata,
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please see: :doc:`2.0_server_concepts`
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- **Flavor**
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@ -68,54 +48,129 @@ several key concepts:
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server images if you plan to deploy a particular server configuration
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frequently.
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- **Reboot**
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- **Key Pair**
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Use this function to perform either a soft or hard reboot of a
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server. With a soft reboot, the operating system is signaled to
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restart, which allows for a graceful shutdown of all processes. A
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hard reboot is the equivalent of power cycling the server. The
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virtualization platform should ensure that the reboot action has
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completed successfully even in cases in which the underlying
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domain/VM is paused or halted/stopped.
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An ssh or x509 keypair that can be injected into a server. This allows you
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to connect to your server once t has been created without having to use a
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password. If you don't specify a key pair, Nova will create a root password
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for you, and return it in plain text in the server create response.
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- **Rebuild**
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- **Volume**
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Use this function to remove all data on the server and replaces it
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with the specified image. Server ID and IP addresses remain the same.
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A block storage device that Nova can use as permanent storage. When a server
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is created it has some disk storage available, but that is considered
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ephemeral, as it is destroyed when the server is destroyed. A volume can be
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attached to a server, then later detached and used by another server.
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Volumes are created and managed by the Cinder service, though the Nova API
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can proxy some of these calls.
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- **Resize**
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- **Quotas**
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Use this function to convert an existing server to a different
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flavor, in essence, scaling the server up or down. The original
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server is saved for a period of time to allow rollback if there is a
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problem. All resizes should be tested and explicitly confirmed, at
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which time the original server is removed. All resizes are
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automatically confirmed after 24 hours if you do not confirm or
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revert them.
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An upper bound on the amount of resources any individual tenant may consume.
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Quotas can be used to limit the number of servers a tenant creates, or the
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amount of disk space consumed, so that no one tenant can overwhelm the
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system and prevent normal operation for others. Changing quotas is an
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admin-level action.
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- **Pause**
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- **Rate Limiting**
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You can pause a server by making a pause request. This request stores
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the state of the VM in RAM. A paused instance continues to run in a
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frozen state.
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Please see :doc:`limits`
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- **Suspend**
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- **Availability zone**
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Administrative users might want to suspend an instance if it is
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infrequently used or to perform system maintenance. When you suspend
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an instance, its VM state is stored on disk, all memory is written to
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disk, and the virtual machine is stopped. Suspending an instance is
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similar to placing a device in hibernation; memory and vCPUs become
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available to create other instances.
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A grouping of host machines that can be used to control where a new server
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is created. There is some confusion about this, as the name "availability
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zone" is used in other clouds, such as Amazon Web Services, to denote a
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physical separation of server locations that can be used to distribute cloud
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resources for fault tolerance in case one zone is unavailable for any
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reason. Such a separation is possible in Nova if an admin carefully sets up
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availability zones for that, but it is not the default.
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Reference
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---------
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Networking Concepts
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-------------------
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For a reference listing for the Compute API v2, see the `*Compute API v2
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reference
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(CURRENT)* <http://developer.openstack.org/api-ref-compute-v2.html>`__.
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In this section we focus on this related to networking.
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For information about Compute API v 2 extensions, see the `*Compute API v2
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extensions
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(CURRENT)* <http://developer.openstack.org/api-ref-compute-v2-ext.html>`__.
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- **Port**
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TODO
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- **Floating IPs, Pools and DNS**
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TODO
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- **Security Groups**
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TODO
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- **Cloudpipe**
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TODO
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- **Extended Networks**
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TODO
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Administrator Concepts
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=======================
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Come APIs are largely focused on administration of Nova, and generally focus
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on compute hosts rather than servers.
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- **Hosts**
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TODO
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- **Host Actions**
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TODO
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- **Hypervisors**
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TODO
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- **Aggregates**
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TODO
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- **Migrations**
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TODO
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- **Certificates**
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TODO
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Error Handling
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==============
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The Compute API follows the standard HTTP error code conventions.
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TODO - add details including: request id, migrations and instance actions.
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Relationship with Volume API
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=============================
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Here we discuss about Cinder's API and how Nova users volume uuids.
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TODO - add more details.
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Relationship with Image API
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=============================
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Here we discuss about Glance's API and how Nova users image uuids.
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We also discuss how Nova proxies setting image metadata.
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TODO - add more details.
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Interactions with Neutron and Nova-Network
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==========================================
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We talk about how networking can be provided be either by Nova or Neutron.
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Here we discuss about Neutron's API an how Nova users port uuids.
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We also discuss Nova automatically creating ports, proxying security groups,
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and proxying floating IPs. Also talk about the APIs we do not proxy.
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TODO - add more details.
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@ -2,8 +2,8 @@
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Server concepts
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===============
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For the OpenStack Compute API, a server is a virtual machine (VM) instance in
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the compute system.
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For the OpenStack Compute API, a server is a virtual machine (VM) instance,
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a physical machine or a container.
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Server status
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~~~~~~~~~~~~~
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@ -104,6 +104,51 @@ administrative password are guaranteed to be returned in the request.
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You can retrieve additional attributes by performing subsequent **GET**
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operations on the server.
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Server actions
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~~~~~~~~~~~~~~~
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- **Reboot**
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Use this function to perform either a soft or hard reboot of a
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server. With a soft reboot, the operating system is signaled to
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restart, which allows for a graceful shutdown of all processes. A
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hard reboot is the equivalent of power cycling the server. The
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virtualization platform should ensure that the reboot action has
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completed successfully even in cases in which the underlying
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domain/VM is paused or halted/stopped.
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- **Rebuild**
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Use this function to remove all data on the server and replaces it
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with the specified image. Server ID and IP addresses remain the same.
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- **Resize**
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Use this function to convert an existing server to a different
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flavor, in essence, scaling the server up or down. The original
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server is saved for a period of time to allow rollback if there is a
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problem. All resizes should be tested and explicitly confirmed, at
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which time the original server is removed. All resizes are
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automatically confirmed after 24 hours if you do not confirm or
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revert them.
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- **Pause**
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You can pause a server by making a pause request. This request stores
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the state of the VM in RAM. A paused instance continues to run in a
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frozen state.
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- **Suspend**
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Administrative users might want to suspend an instance if it is
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infrequently used or to perform system maintenance. When you suspend
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an instance, its VM state is stored on disk, all memory is written to
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disk, and the virtual machine is stopped. Suspending an instance is
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similar to placing a device in hibernation; memory and vCPUs become
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available to create other instances.
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TODO - need to add many more actions in here
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Server passwords
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~~~~~~~~~~~~~~~~
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@ -13,25 +13,82 @@
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License for the specific language governing permissions and limitations
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under the License.
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Compute API v2
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==============
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===========
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Compute API
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===========
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This section describes the Compute API version 2 and is intended for software
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developers interested in developing applications using the OpenStack Compute
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Application Programming Interface (API).
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OpenStack Nova has a ReSTful HTTP service called the OpenStack Compute API.
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Through this API, Nova provides massively scalable, on demand, self service
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access to compute resources. Depending on the deployment those compute
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resources might be Virtual Machines, Physical Machines or Containers.
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We welcome feedback, comments, and bug reports at
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`bugs.launchpad.net/nova <http://bugs.launchpad.net/nova>`__.
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Intended Audience
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||||
=================
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||||
|
||||
This guide assists software developers who want to develop applications
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||||
using the OpenStack Compute API. To use this information, you should
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||||
have access to an account from an OpenStack Compute provider, or have
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||||
access to your own deployment, and you should also be familiar with the
|
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following concepts:
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* OpenStack Compute service
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* ReSTful web services
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* HTTP/1.1
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* JSON data serialization formats
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Versions and Extensions
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=======================
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Following the Liberty release, every Nova deployment should have
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the following endpoints:
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* / - list of available versions
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* /v2.0 - the first version of the Compute API, uses extensions
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* /v1.1 - an alias for v2.0 for backwards compatibility
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* /v2.1 - same API, except uses microversions
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For more information on how to make use the API, how to get the endpoint
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from the keystone service catalog and pick what version of the API to use,
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please read:
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.. toctree::
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:maxdepth: 3
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:maxdepth: 1
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versions
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extensions
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microversions
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Key API Concepts
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================
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The following documents go into more details about the key concepts of the
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OpenStack Compute API:
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.. toctree::
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:maxdepth: 2
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2.0_general_info
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2.0_server_concepts
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authentication
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extensions
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faults
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limits
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links_and_references
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paginated_collections
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polling_changes-since_parameter
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request_and_response_formats
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versions
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Full Reference
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==============
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For a full reference listing for the OpenStack Compute API, please see:
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* `*Compute API v2.1 extensions (CURRENT)* <http://developer.openstack.org/api-ref-compute-v2.1.html>`__.
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* `*Compute API v2 reference (SUPPORTED)* <http://developer.openstack.org/api-ref-compute-v2.html>`__.
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* `*Compute API v2 extensions (SUPPORTED)* <http://developer.openstack.org/api-ref-compute-v2-ext.html>`__.
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21
doc/source/v2/microversions.rst
Normal file
21
doc/source/v2/microversions.rst
Normal file
@ -0,0 +1,21 @@
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..
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Licensed under the Apache License, Version 2.0 (the "License"); you may
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not use this file except in compliance with the License. You may obtain
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||||
a copy of the License at
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||||
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||||
http://www.apache.org/licenses/LICENSE-2.0
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||||
Unless required by applicable law or agreed to in writing, software
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||||
distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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||||
WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
||||
License for the specific language governing permissions and limitations
|
||||
under the License.
|
||||
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||||
==============
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Microversions
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||||
==============
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API v2.1 users micro versions, instead of extensions, to allow for the API
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||||
to slowly evolve over time, without breaking any existing users.
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||||
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||||
TODO - add more information.
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