6f5ceb20a5
The nova-network service was deprecated, this patch to remove the nova-network. Change-Id: I811472ae7bb1ee62ef9cc71271f0170f9e8d6d23
51 lines
1.4 KiB
ReStructuredText
51 lines
1.4 KiB
ReStructuredText
===========================
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Handling a Complete Failure
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===========================
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A common way of dealing with the recovery from a full system failure,
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such as a power outage of a data center, is to assign each service a
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priority, and restore in order.
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:ref:`table_example_priority` shows an example.
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.. _table_example_priority:
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.. list-table:: Table. Example service restoration priority list
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:header-rows: 1
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* - Priority
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- Services
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* - 1
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- Internal network connectivity
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* - 2
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- Backing storage services
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* - 3
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- Public network connectivity for user virtual machines
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* - 4
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- ``nova-compute``, cinder hosts
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* - 5
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- User virtual machines
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* - 10
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- Message queue and database services
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* - 15
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- Keystone services
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* - 20
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- ``cinder-scheduler``
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* - 21
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- Image Catalog and Delivery services
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* - 22
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- ``nova-scheduler`` services
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* - 98
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- ``cinder-api``
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* - 99
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- ``nova-api`` services
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* - 100
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- Dashboard node
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Use this example priority list to ensure that user-affected services are
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restored as soon as possible, but not before a stable environment is in
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place. Of course, despite being listed as a single-line item, each step
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requires significant work. For example, just after starting the
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database, you should check its integrity, or, after starting the nova
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services, you should verify that the hypervisor matches the database and
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fix any mismatches.
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