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runtime: Add documentation of drop-in config file fragments

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Added user manual for the drop-in config file fragments feature.

Signed-off-by: Pavel Mores <pmores@redhat.com>
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Pavel Mores 2022-05-11 13:39:12 +02:00
parent c656457e90
commit 96553e8bd2
1 changed files with 21 additions and 0 deletions
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src/runtime/README.md
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@ -87,6 +87,27 @@ following locations (in order):
> **Note:** For both binaries, the first path that exists will be used.
#### Drop-in configuration file fragments
To enable changing configuration without changing the configuration file
itself, drop-in configuration file fragments are supported. Once a
configuration file is parsed, if there is a subdirectory called `config.d` in
the same directory as the configuration file its contents will be loaded
in alphabetical order and each item will be parsed as a config file. Settings
loaded from these configuration file fragments override settings loaded from
the main configuration file and earlier fragments. Users are encouraged to use
familiar naming conventions to order the fragments (e.g. `config.d/10-this`,
`config.d/20-that` etc.).
Non-existent or empty `config.d` directory is not an error (in other words, not
using configuration file fragments is fine). On the other hand, if fragments
are used, they must be valid - any errors while parsing fragments (unreadable
fragment files, contents not valid TOML) are treated the same as errors
while parsing the main configuration file. A `config.d` subdirectory affects
only the `configuration.toml` _in the same directory_. For fragments in
`config.d` to be parsed, there has to be a valid main configuration file _in
that location_ (it can be empty though).
### Hypervisor specific configuration
Kata Containers supports multiple hypervisors so your `configuration.toml`