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February 28, 2018 18:50
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Node and label specific configurations | |
-------------------------------------- | |
There are situations where we need to define configuration differently for | |
different nodes in the environment. For example, we may require that some nodes | |
have a different vcpu_pin_set or other hardware specific deltas in nova.conf. | |
To do this, we can specify overrides in the values fed to the chart. Ex: | |
.. code-block:: yaml | |
conf: | |
nova: | |
DEFAULT: | |
vcpu_pin_set: "0-31" | |
cpu_allocation_ratio: 3.0 | |
overrides: | |
nova_compute: | |
labels: | |
- label: | |
key: compute-type | |
values: | |
- "dpdk" | |
- "sriov" | |
conf: | |
nova: | |
DEFAULT: | |
vcpu_pin_set: "0-15" | |
- label: | |
key: another-label | |
values: | |
- "another-value" | |
conf: | |
nova: | |
DEFAULT: | |
vcpu_pin_set: "16-31" | |
hosts: | |
- name: host1.fqdn | |
conf: | |
nova: | |
DEFAULT: | |
vcpu_pin_set: "8-15" | |
- name: host2.fqdn | |
conf: | |
nova: | |
DEFAULT: | |
vcpu_pin_set: "16-23" | |
Note that only one set of overrides is applied per node, such that: | |
1. Host overrides supercede label overrides | |
2. The farther down the list the label appears, the greater precedence it has. | |
e.g., "another-label" overrides will apply to a node containing both labels. | |
Also note that other non-overridden values are inherited by hosts and labels with overrides. | |
The following shows a set of example hosts and the values fed into the configmap for each: | |
1. ``host1.fqdn`` with labels ``compute-type: dpdk, sriov`` and ``another-label: another-value``: | |
.. code-block:: yaml | |
conf: | |
nova: | |
DEFAULT: | |
vcpu_pin_set: "8-15" | |
cpu_allocation_ratio: 3.0 | |
2. ``host2.fqdn`` with labels ``compute-type: dpdk, sriov`` and ``another-label: another-value``: | |
.. code-block:: yaml | |
conf: | |
nova: | |
DEFAULT: | |
vcpu_pin_set: "16-23" | |
cpu_allocation_ratio: 3.0 | |
3. ``host3.fqdn`` with labels ``compute-type: dpdk, sriov`` and ``another-label: another-value``: | |
.. code-block:: yaml | |
conf: | |
nova: | |
DEFAULT: | |
vcpu_pin_set: "16-31" | |
cpu_allocation_ratio: 3.0 | |
4. ``host4.fqdn`` with labels ``compute-type: dpdk, sriov``: | |
.. code-block:: yaml | |
conf: | |
nova: | |
DEFAULT: | |
vcpu_pin_set: "0-15" | |
cpu_allocation_ratio: 3.0 | |
5. ``host5.fqdn`` with no labels: | |
.. code-block:: yaml | |
conf: | |
nova: | |
DEFAULT: | |
vcpu_pin_set: "0-31" | |
cpu_allocation_ratio: 3.0 |
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