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| -rw-r--r-- | docs/PORTABLE_SERVICES.md | 21 |
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diff --git a/docs/PORTABLE_SERVICES.md b/docs/PORTABLE_SERVICES.md index b12e7754e7..7936eebccb 100644 --- a/docs/PORTABLE_SERVICES.md +++ b/docs/PORTABLE_SERVICES.md @@ -335,6 +335,27 @@ service data may be placed on the host file system. Use `StateDirectory=` in the unit files to enable such behaviour and add a local data directory to the services copied onto the host. +## Logging + +Several fields are autotmatically added to log messages generated by a portable +service (or about a portable service, e.g.: start/stop logs from systemd). +The `PORTABLE=` field will refer to the name of the portable image where the unit +was loaded from. In case extensions are used, additionally there will be a +`PORTABLE_ROOT=` field, referring to the name of image used as the base layer +(i.e.: `RootImage=` or `RootDirectory=`), and one `PORTABLE_EXTENSION=` field per +each extension image used. + +For example, a portable service `app0` using two extensions `app0.raw` and +`app1.raw`, and a base layer `base.raw`, will create log entries with the +following fields: + +``` +PORTABLE=app0.raw +PORTABLE_ROOT=base.raw +PORTABLE_EXTENSION=app0.raw +PORTABLE_EXTENSION=app1.raw +``` + ## Links [`portablectl(1)`](https://www.freedesktop.org/software/systemd/man/portablectl.html)<br> |