cloud-init: add page (#8139)

pages/linux/cloud-init.md

@@ -0,0 +1,24 @@
+# cloud-init
+
+> Command line tool for managing cloud instance initialization.
+> More information: <https://cloudinit.readthedocs.io>.
+
+- Display the status of the most recent cloud-init run:
+
+`cloud-init status`
+
+- Wait for cloud-init to finish running and then report status:
+
+`cloud-init status --wait`
+
+- List available top-level metadata keys to query:
+
+`cloud-init query --list-keys`
+
+- Query cached instance metadata for data:
+
+`cloud-init query {{dot_delimited_variable_path}}`
+
+- Clean logs and artifacts to allow cloud-init to rerun:
+
+`cloud-init clean`