netdev - Re: [PATCH net-next] [RFC] netns: enable cross-ve Unix sockets

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Message-ID: <48E3653C.1070701@fr.ibm.com>
Date:	Wed, 01 Oct 2008 13:55:40 +0200
From:	Daniel Lezcano <dlezcano@...ibm.com>
To:	"Denis V. Lunev" <den@...nvz.org>
CC:	netdev@...r.kernel.org, containers@...ts.linux-foundation.org,
	benjamin.thery@...l.net, ebiederm@...ssion.com, xemul@...nvz.org
Subject: Re: [PATCH net-next] [RFC] netns: enable cross-ve Unix sockets

Denis V. Lunev wrote:
> On Wed, 2008-10-01 at 13:13 +0200, Daniel Lezcano wrote:
>> Denis V. Lunev wrote:
>>> This patch opens a way to connect via Unix socket from one namespace
>>> to another if these sockets are opened via conventional filesystem
>>> interface. Such approach allows to share important services between
>>> namespaces in efficient way.
>>>
>>> This breach is controlled by the means of shared filesystem, i.e. if
>>> somebody really wants to isolate containers, he should start from
>>> filesystem separation.
>>>
>>> Signed-off-by: Denis V. Lunev <den@...nvz.org>
>>> ---
>>>  net/unix/af_unix.c |    3 ---
>>>  1 files changed, 0 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
>>> index 39d2173..0e1eccd 100644
>>> --- a/net/unix/af_unix.c
>>> +++ b/net/unix/af_unix.c
>>> @@ -297,9 +297,6 @@ static struct sock *unix_find_socket_byinode(struct net *net, struct inode *i)
>>>  		    &unix_socket_table[i->i_ino & (UNIX_HASH_SIZE - 1)]) {
>>>  		struct dentry *dentry = unix_sk(s)->dentry;
>>>
>>> -		if (!net_eq(sock_net(s), net))
>>> -			continue;
>>> -
>>>  		if(dentry && dentry->d_inode == i)
>>>  		{
>>>  			sock_hold(s);
>> Hi Denis,
>>
>> Do you have a list of the important services this isolation forbids ? (I 
>> suppose there is syslog).
> 
> we have asked from our customers for a shared MySQL server
> 
> The full story is here :)
> http://bugzilla.openvz.org/show_bug.cgi?id=985

Ok, thanks.

My question remains :)

How do you handle migration in this case ?
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