Saltstack module defaults 详解

defaults.update

defaults.update
    Allows to set defaults for group of data set e.g. group for nodes.

    This function is a combination of defaults.merge
    and defaults.deepcopy to avoid redundant in jinja.

    Example:

        group01:
          defaults:
            enabled: True
            extra:
              - test
              - stage
          nodes:
            host01:
              index: foo
              upstream: bar
            host02:
              index: foo2
              upstream: bar2

        {% do salt['defaults.update'](group01.nodes, group01.defaults) %}

    Each node will look like the following:

        host01:
          enabled: True
          index: foo
          upstream: bar
          extra:
            - test
            - stage

merge_lists : True
    If True, it will also merge lists instead of replace their items.

in_place : True
    If True, it will merge into dest dict.
    if not it will make a new copy from that dict and return it.

It is more typical to use this in a templating language in formulas,
instead of directly on the command-line.

defaults.get

defaults.get is used much like pillar.get except that it will read
a default value for a pillar from defaults.json or defaults.yaml
files that are stored in the root of a salt formula.

CLI Example:

    salt '*' defaults.get core:users:root

The defaults is computed from pillar key. The first entry is considered as
the formula namespace.

For example, querying ``core:users:root`` will try to load
``salt://core/defaults.yaml`` and ``salt://core/defaults.json``.

defaults.deepcopy

defaults.deepcopy
    Allows deep copy of objects in formulas.

    By default, Python does not copy objects,
    it creates bindings between a target and an object.

It is more typical to use this in a templating language in formulas,
instead of directly on the command-line.

defaults.merge

defaults.merge
    Allows deep merging of dicts in formulas.

merge_lists : False
    If True, it will also merge lists instead of replace their items.

in_place : True
    If True, it will merge into dest dict,
    if not it will make a new copy from that dict and return it.

    CLI Example:
    salt '*' default.merge a=b d=e

It is more typical to use this in a templating language in formulas,
instead of directly on the command-line.