8d23741c20
This PS adds documentation for node and label specific configurations. Change-Id: I2bb02bfa028a61b2d8a9206eaff305590664946f
107 lines
2.7 KiB
ReStructuredText
107 lines
2.7 KiB
ReStructuredText
Node and label specific configurations
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--------------------------------------
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There are situations where we need to define configuration differently for
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different nodes in the environment. For example, we may require that some nodes
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have a different vcpu_pin_set or other hardware specific deltas in nova.conf.
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To do this, we can specify overrides in the values fed to the chart. Ex:
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.. code-block:: yaml
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conf:
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nova:
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DEFAULT:
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vcpu_pin_set: "0-31"
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cpu_allocation_ratio: 3.0
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overrides:
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nova_compute:
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labels:
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- label:
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key: compute-type
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values:
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- "dpdk"
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- "sriov"
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conf:
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nova:
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DEFAULT:
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vcpu_pin_set: "0-15"
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- label:
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key: another-label
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values:
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- "another-value"
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conf:
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nova:
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DEFAULT:
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vcpu_pin_set: "16-31"
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hosts:
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- name: host1.fqdn
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conf:
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nova:
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DEFAULT:
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vcpu_pin_set: "8-15"
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- name: host2.fqdn
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conf:
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nova:
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DEFAULT:
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vcpu_pin_set: "16-23"
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Note that only one set of overrides is applied per node, such that:
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1. Host overrides supercede label overrides
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2. The farther down the list the label appears, the greater precedence it has.
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e.g., "another-label" overrides will apply to a node containing both labels.
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Also note that other non-overridden values are inherited by hosts and labels with overrides.
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The following shows a set of example hosts and the values fed into the configmap for each:
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1. ``host1.fqdn`` with labels ``compute-type: dpdk, sriov`` and ``another-label: another-value``:
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.. code-block:: yaml
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conf:
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nova:
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DEFAULT:
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vcpu_pin_set: "8-15"
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cpu_allocation_ratio: 3.0
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2. ``host2.fqdn`` with labels ``compute-type: dpdk, sriov`` and ``another-label: another-value``:
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.. code-block:: yaml
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conf:
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nova:
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DEFAULT:
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vcpu_pin_set: "16-23"
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cpu_allocation_ratio: 3.0
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3. ``host3.fqdn`` with labels ``compute-type: dpdk, sriov`` and ``another-label: another-value``:
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.. code-block:: yaml
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conf:
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nova:
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DEFAULT:
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vcpu_pin_set: "16-31"
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cpu_allocation_ratio: 3.0
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4. ``host4.fqdn`` with labels ``compute-type: dpdk, sriov``:
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.. code-block:: yaml
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conf:
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nova:
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DEFAULT:
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vcpu_pin_set: "0-15"
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cpu_allocation_ratio: 3.0
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5. ``host5.fqdn`` with no labels:
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.. code-block:: yaml
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conf:
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nova:
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DEFAULT:
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vcpu_pin_set: "0-31"
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cpu_allocation_ratio: 3.0
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