[prev in list] [next in list] [prev in thread] [next in thread] 

List:       lxc-users
Subject:    [Lxc-users] IPC with shared memory?
From:       serge.hallyn () canonical ! com (Serge Hallyn)
Date:       2012-12-13 11:56:22
Message-ID: 20121213115622.GC5246 () sergelap
[Download RAW message or body]

Quoting Binknight (zheng_huabin at 163.com):
> hi, 
> i have two processes running in two containers on the same hardware node, they are \
> expected to communicate with shared memory IPC mechanism, but it turned out to be \
> failed.  It seems that the shared memory created in one container is not visible to \
> process in other container because different namespace. is there any way to address \
> this problem?

Hm, I thought you could specify the namespaces to be unshared in
lxc.conf, but I see you can't.  Given the flexibility that lxc
strives toward I find that surprising.  Please feel free to write
a simple patch to add an lxc.ns option to lxc.conf, and use that
in start.c to pick the namespaces to unshare.

Then you would create a shell in a new IPC ns,

	lxc-unshare -s IPC -- /bin/bash

and from there start the two containers without IPC in their clone
flags, so that they would share an IPC ns with each other, but not
with the host.

-serge


[prev in list] [next in list] [prev in thread] [next in thread]