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-rw-r--r--docs/ENVIRONMENT.md9
1 files changed, 9 insertions, 0 deletions
diff --git a/docs/ENVIRONMENT.md b/docs/ENVIRONMENT.md
index e965cb885..e9e82cfca 100644
--- a/docs/ENVIRONMENT.md
+++ b/docs/ENVIRONMENT.md
@@ -91,6 +91,15 @@ systemd-logind:
hibernation is available even if the swap devices do not provide enough room
for it.
+* `$NET_NAMING_SCHEME=` – if set, takes a network naming scheme (i.e. one of
+ v238, v239, v240 …) as parameter. If specified udev's net_id builtin will
+ follow the specified naming scheme when determining stable network interface
+ names. This may be used to revert to naming schemes of older udev versions,
+ in order to provide more stable naming across updates. This environment
+ variable takes precedence over the kernel command line option
+ `net.naming-scheme=`, except if the value is prefixed with `:` in which case
+ the kernel command line option takes precedence, if it is specified as well.
+
installed systemd tests:
* `$SYSTEMD_TEST_DATA` — override the location of test data. This is useful if