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-rw-r--r--cloudinit/config/cc_write_files.py5
1 files changed, 5 insertions, 0 deletions
diff --git a/cloudinit/config/cc_write_files.py b/cloudinit/config/cc_write_files.py
index 1b7e7e30..31d1db61 100644
--- a/cloudinit/config/cc_write_files.py
+++ b/cloudinit/config/cc_write_files.py
@@ -18,6 +18,11 @@ binary gzip data can be specified and will be decoded before being written.
follows yaml formatting standards. to specify binary data, use the yaml
option ``!!binary``
+.. note::
+ Do not write files under /tmp during boot because of a race with
+ systemd-tmpfiles-clean that can cause temp files to get cleaned during
+ the early boot process. Use /run/somedir instead to avoid race LP:1707222.
+
**Internal name:** ``cc_write_files``
**Module frequency:** per instance