fa7218d902
Changing 'it is recommended' to 'we recommend' as per doc guidelines. Change-Id: I3f546a7fc398cba80eee2d7b97a879688d206809
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84 lines
1.9 KiB
ReStructuredText
`Home <index.html>`_ OpenStack-Ansible Installation Guide
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Host layout
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-----------
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The recommended layout contains a minimum of five hosts (or servers).
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- Three control plane infrastructure hosts
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- One logging infrastructure host
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- One compute host
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To use the optional Block Storage (cinder) service, a sixth host is
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recommended. Block Storage hosts require an LVM volume group named
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*cinder-volumes*. See `the section called "Installation
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requirements" <overview-requirements.html>`_ and `the section
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called "Configuring LVM" <targethosts-configlvm.html>`_ for more information.
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The hosts are called *target hosts* because Ansible deploys the OSA
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environment within these hosts. The OSA environment also recommends a
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*deployment host* from which Ansible orchestrates the deployment
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process. One of the target hosts can function as the deployment host.
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At least one load balancer **must** be used to manage the traffic among
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the target hosts. This can be any load balance of any type (hardware, haproxy,
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etc). While OpenStack-Ansible has playbooks and roles for deploying haproxy,
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we recommend for deployers to use physical load balancers when moving to
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production.
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Infrastructure Control Plane target hosts contain the following
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services:
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- Infrastructure:
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- Galera
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- RabbitMQ
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- Memcached
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- Logging
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- Repository
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- OpenStack:
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- Identity (keystone)
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- Image service (glance)
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- Compute management (nova)
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- Networking (neutron)
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- Orchestration (heat)
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- Dashboard (horizon)
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Infrastructure Logging target hosts contain the following services:
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- Rsyslog
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Compute target hosts contain the following services:
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- Compute virtualization
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- Logging
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(Optional) Storage target hosts contain the following services:
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- Block Storage scheduler
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- Block Storage volumes
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**Figure 1.1. Host Layout Overview**
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.. image:: figures/environment-overview.png
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--------------
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.. include:: navigation.txt
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