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nova
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Merge "Add exception to no-upcall note of cells doc"

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Zuul 2018-01-27 11:32:19 +00:00 committed by Gerrit Code Review
parent 988f86374d 30786b892e
commit 5de8969ffe
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19
doc/source/user/cellsv2-layout.rst
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@ -231,15 +231,16 @@ to distinguish its place and purpose from the per-cell conductor nodes.
conductor -> mq2
}
It is important to note that services in the lower cell boxes do not
have the ability to call back to the API-layer services via RPC, nor
do they have access to the API database for global visibility of
resources across the cloud. This is intentional and provides security
and failure domain isolation benefits, but also has impacts on some
things that would otherwise require this any-to-any communication
style. Check the release notes for the version of Nova you are using
for the most up-to-date information about any caveats that may be
present due to this limitation.
It is important to note that services in the lower cell boxes only
have the ability to call back to the placement API but cannot access
any other API-layer services via RPC, nor do they have access to the
API database for global visibility of resources across the cloud.
This is intentional and provides security and failure domain
isolation benefits, but also has impacts on some things that would
otherwise require this any-to-any communication style. Check the
release notes for the version of Nova you are using for the most
up-to-date information about any caveats that may be present due to
this limitation.
Caveats of a Multi-Cell deployment
----------------------------------