40 lines
1.4 KiB
Plaintext
40 lines
1.4 KiB
Plaintext
[[ha-aa-network]]
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=== OpenStack network nodes
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OpenStack network nodes contain:
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* neutron DHCP agent
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* neutron L2 agent
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* Neutron L3 agent
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* neutron metadata agent
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* neutron lbaas agent
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NOTE: The neutron L2 agent does not need to be highly available. It has to be
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installed on each Data Forwarding Node and controls the virtual networking
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drivers as Open vSwitch or Linux Bridge. One L2 agent runs per node
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and controls its virtual interfaces. That's why it cannot be distributed and
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highly available.
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==== Run neutron DHCP agent
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OpenStack Networking service has a scheduler that
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lets you run multiple agents across nodes. Also, the DHCP agent can be natively
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highly available. For details, see http://docs.openstack.org/trunk/config-reference/content/app_demo_multi_dhcp_agents.html[OpenStack Configuration Reference].
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==== Run neutron L3 agent
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The neutron L3 agent is scalable thanks to the scheduler
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that allows distribution of virtual routers across multiple nodes.
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But there is no native feature to make these routers highly available.
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At this time, the Active / Passive solution exists to run the Neutron L3
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agent in failover mode with Pacemaker. See the Active / Passive
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section of this guide.
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==== Run neutron metadata agent
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There is no native feature to make this service highly available.
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At this time, the Active / Passive solution exists to run the neutron
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metadata agent in failover mode with Pacemaker. See the Active /
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Passive section of this guide.
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