Fixed heading levels in reference architecture
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Logical Setup
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-------------
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^^^^^^^^^^^^^
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An OpenStack HA cluster involves, at a minimum, three types of nodes:
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controller nodes, compute nodes, and storage nodes.
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Controller Nodes
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^^^^^^^^^^^^^^^^
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++++++++++++++++
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The first order of business in achieving high availability (HA) is
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redundancy, so the first step is to provide multiple controller nodes.
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You must keep in mind, however, that the database uses Galera to
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@ -45,7 +47,7 @@ mechanism for achieving HA:
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Compute Nodes
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^^^^^^^^^^^^^
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+++++++++++++
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OpenStack compute nodes are, in many ways, the foundation of your
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cluster; they are the servers on which your users will create their
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@ -60,7 +62,7 @@ controller nodes using the VIP and going through HAProxy.
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Storage Nodes
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^^^^^^^^^^^^^
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+++++++++++++
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In this OpenStack cluster reference architecture, shared storage acts
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@ -1,6 +1,6 @@
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Cluster Sizing
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--------------
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^^^^^^^^^^^^^^
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This reference architecture is well suited for production-grade
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OpenStack deployments on a medium and large scale when you can afford
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@ -1,6 +1,6 @@
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Network Architecture
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--------------------
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^^^^^^^^^^^^^^^^^^^^
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The current architecture assumes the presence of 3 NIC cards in
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@ -26,7 +26,8 @@ cluster.
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Public Network
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^^^^^^^^^^^^^^
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++++++++++++++
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This network allows inbound connections to VMs from the outside world
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(allowing users to connect to VMs from the Internet). It also allows
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outbound connections from VMs to the outside world.
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@ -61,7 +62,7 @@ The public network also provides VIPs for Endpoint nodes, which are
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used to connect to OpenStack services APIs.
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Internal (Management) Network
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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+++++++++++++++++++++++++++++
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The internal network connects all OpenStack nodes in the cluster. All
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components of an OpenStack cluster communicate with each other using
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@ -80,7 +81,7 @@ non-globally routed IP address range.
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Private Network
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^^^^^^^^^^^^^^^
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+++++++++++++++
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The private network facilitates communication between each tenant's
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VMs. Private network address spaces are part of the enterprise network
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