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Control plane for Unix processes, containers and sandboxes

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alcove edoc setns-4.edoc
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edoc/setns-4.edoc 

@doc setns(2): attach to a namespace



A process namespace is represented as a path in the /proc filesystem. The

path is `/proc/<pid>/ns/<ns>', where:



* pid: the system PID



* ns: a file representing the namespace



The available namespaces is dependent on the kernel version. You can

see which are supported by running:



```

ls -al /proc/$$/ns

'''



== Support ==



* Linux



== Examples ==



Attach a process to an existing network namespace:



```

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

{ok,<0.208.0>}

2> {ok, Pid1} = alcove:clone(Drv, [], [clone_newnet]).

{ok,27125}

3> {ok, Pid2} = alcove:fork(Drv, []).

{ok,27126}

% Move Pid2 into the Pid1 network namespace

4> {ok, FD} = alcove:open(Drv, [Pid2], ["/proc/", integer_to_list(Pid1), "/ns/net"], [o_rdonly], 0).

{ok,8}

5> alcove:setns(Drv, [Pid2], FD, 0).

ok

6> alcove:close(Drv, [Pid2], FD).

'''