criu: add page (#22394)

pages/linux/criu.md

@@ -0,0 +1,20 @@
+# criu
+
+> Freeze a running application or a process tree and restore it later.
+> More information: <https://manned.org/criu>.
+
+- Check if the current kernel has support for the necessary CRIU features:
+
+`sudo criu check`
+
+- Checkpoint a process with a specific ID, saving the state to a specific directory:
+
+`sudo criu dump {{[-t|--tree]}} {{process_id}} {{[-D|--images-dir]}} {{path/to/directory}}`
+
+- Restore a process from previously saved image files:
+
+`sudo criu restore {{[-D|--images-dir]}} {{path/to/directory}}`
+
+- Dump a process and allow it to continue running instead of terminating it:
+
+`sudo criu dump {{[-t|--tree]}} {{process_id}} {{[-D|--images-dir]}} {{path/to/directory}} {{[-R|--leave-running]}}`