pivot_root.2: Mention containers as a use case for pivot_root()

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

diff --git a/man2/pivot_root.2 b/man2/pivot_root.2
index 5d13fc1c3817c82bff0d85c6db11e46fe2923c9c..569faa5640221db65219ab7315ef50df5ac3b3bc 100644 (file)
--- a/man2/pivot_root.2
+++ b/man2/pivot_root.2
@@ -25,12 +25,14 @@ The calling process must have the
 .B CAP_SYS_ADMIN
 capability in the user namespace that owns the caller's mount namespace.
 .PP
-The typical use of
+A typical use of
 .BR pivot_root ()
 is during system startup, when the
 system mounts a temporary root filesystem (e.g., an \fBinitrd\fP), then
 mounts the real root filesystem, and eventually turns the latter into
 the current root of all relevant processes or threads.
+A modern use is to set up a root filesystem during
+the creation of a container.
 .PP
 .BR pivot_root ()
 may or may not change the current root and the current