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-rw-r--r--src/core/mount-setup.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/src/core/mount-setup.c b/src/core/mount-setup.c
index c10c6dad1c..e86a89321e 100644
--- a/src/core/mount-setup.c
+++ b/src/core/mount-setup.c
@@ -400,6 +400,15 @@ int mount_setup(bool loaded_policy) {
* udevd. */
dev_setup();
+ /* Mark the root directory as shared in regards to mount
+ * propagation. The kernel defaults to "private", but we think
+ * it makes more sense to have a default of "shared" so that
+ * nspawn and the container tools work out of the box. If
+ * specific setups need other settings they can reset the
+ * propagation mode to private if needed. */
+ if (mount(NULL, "/", NULL, MS_REC|MS_SHARED, NULL) < 0)
+ log_warning("Failed to set up the root directory for shared mount propagation: %m");
+
/* Create a few directories we always want around */
mkdir_label("/run/systemd", 0755);
mkdir_label("/run/systemd/system", 0755);