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XROOTD-L  June 2013

XROOTD-L June 2013

Subject:

Re: proxy setup for xroot

From:

"Yang, Wei" <[log in to unmask]>

Reply-To:

Support use of xrootd by HEP experiments <[log in to unmask]>

Date:

Wed, 26 Jun 2013 23:27:33 -0700

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (91 lines)

Hi Victor,

Indeed I also think this is an interesting and useful ideal, and it is likely easy to do. Something for Lukasz to think of …

In your case, you probably can use the following example in /etc/sysconfig/iptables on batch nodes

*nat
:PREROUTING ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
# Traffic going to LFC @ BNL (192.12.15.102:5010) will be redirected to 134.79.198.159:5010
-A PREROUTING -p tcp -d 192.12.15.102 --destination-port 5010 -j DNAT --to-destination 134.79.198.159:5010
-A OUTPUT -p tcp -d 192.12.15.102 --destination-port 5010 -j DNAT --to-destination 134.79.198.159:5010
-A POSTROUTING -p tcp -s 134.79.198.159 --source-port 5010 -j SNAT --to-source 192.12.15.102:5010


Wei Yang | [log in to unmask] | 650-926-3338(O)



On Jun 26, 2013, at 10:10 PM, Victor Kotlyar <[log in to unmask]> wrote:

> Hi Wei
>
> on 26.06.2013 23:18, Yang, Wei wrote:
>> Hi Victor,
>>
>> Try to understand your question: is this about something like root_proxy variable? Since you have done a proxy setup so I suppose your question is not about if and how for setting up a proxy. I don't think we currently have this. But I think you can request such a feature to be implemented. In the mean time, I am doing similar things at SLAC by manipulating the NAT table in iptables (modify TCP head so that traffic to host A is sent to host B, etc.)
>
> Yes it is like a root_proxy variable.
> I do not know if it will be widely used but maybe idea is interesting.
> When everybody and everywhere in HEP switched to root it might be useful.
>
>
> In our case:
> we have WN's after GW (NAT) in our network and a server outside our
> network. We would like to reroute all xroot\root traffic to our WNs GW
> through that particular server.
>
> If you have similar setup could you please describe it a little bit.
>
> Best regards,
> Victor Kotlyar
>
>>
>> regards,
>> Wei Yang | [log in to unmask] | 1-650-926-3338
>>
>>
>>
>>
>> On Jun 26, 2013, at 11:43 AM, Victor Kotlyar<[log in to unmask]> wrote:
>>
>>> Dear xrootd experts.
>>>
>>> Since 6th of June we have problems with connection to outside Russia for
>>> our institute.
>>> We investigate any possibility to use another Institutes for rerouting
>>> our Grid traffic.
>>>
>>> So I have a very simple question: is it possible to create a proxy
>>> server for xroot?
>>>
>>> For example we use http_proxy environment variable to redirect all http
>>> traffic through http proxy server on WorkingNodes.
>>>
>>> On our Grid site Alice experiment initiates many connections on 1095tcp
>>> port to outside storage servers and it would be very usefull just to set
>>> xroot_proxy environment variable and install xrootd in proxy mode on
>>> other site.
>>>
>>> I guess that it is not so simple. Could you please make any
>>> recomendations what is possible to try in our case?
>>>
>>> Many thanks
>>> Best regards,
>>> Victor Kotlyar
>>>
>>> ########################################################################
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