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Control plane for Unix processes, containers and sandboxes

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alcove edoc pivot_root-4.edoc
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edoc/pivot_root-4.edoc 

@doc pivot_root(2): change the root mount



Use pivot_root(2) in a Linux mount namespace to change the root

filesystem.



Warning: using pivot_root(2) in the global namespace may have unexpected

effects.



== Support ==



* Linux



== Examples ==



The new root must be a mount point. /tmp or /run are usually mounted

as tmpfs.



```

1> {ok, Drv} = alcove_drv:start([{exec, "sudo -n"}]).

{ok,<0.177.0>}

2> alcove:mkdir(Drv, [], "/run/alcove-old-root", 8#755).

ok

3> {ok, Pid} = alcove:clone(Drv, [], [clone_newns]).

{ok,1371}

4> alcove:pivot_root(Drv, [Pid], "/run", "/run/alcove-old-root").

ok

'''