[CRIU] [PATCH 0/3] p.haul: ssh tunneling, v5

[Pavel Emelyanov]

On 10/31/2014 03:29 PM, Ruslan Kuprieiev wrote:
> On 31.10.2014 11:27, Pavel Emelyanov wrote:
>> On 10/31/2014 02:18 PM, Ruslan Kuprieiev wrote:
>>> On 29.10.2014 11:29, Ruslan Kuprieiev wrote:
>>>> On 29.10.2014 10:03, Pavel Emelyanov wrote:
>>>>> On 10/28/2014 01:18 AM, Ruslan Kuprieiev wrote:
>>>>>> v2, use ssh tunnel by default, enhanced opts handling
>>>>>> v3, send addr to the client
>>>>>> v4, use rpc to send socket name
>>>>>> v5, add --no-ssh option
>>>>>>
>>>>>> Ruslan Kuprieiev (3):
>>>>>>    p.haul: do not use getsockname() as a hash_name, v4
>>>>>>    p.haul: add --port option to p.haul-service
>>>>>>    p.haul: use ssh tunneling and controll it with ssh* cmdline opts, v2
>>>>>>
>>>>>>   p.haul          | 17 +++++++++++++++--
>>>>>>   p.haul-service  | 15 ++++++++++++++-
>>>>>>   p_haul_iters.py |  6 +++---
>>>>>>   ssh_tunnel.py   | 36 ++++++++++++++++++++++++++++++++++++
>>>>>>   util.py         | 10 ++++++++++
>>>>>>   xem_rpc.py      | 53 ++++++++++++++++++++++++++++++++++++++---------------
>>>>>>   6 files changed, 116 insertions(+), 21 deletions(-)
>>>>>>   create mode 100644 ssh_tunnel.py
>>>>>>
>>>>> I'm still not happy with the fact the spawned ssh with port forwarding
>>>>> takes time to prepare and we have to retry connecting to it.
>>>>>
>>>>> I was today told about the paramiko package -- https://pypi.python.org/pypi/paramiko/
>>>>> Isn't it better to utilize this one?
>>>> I've tried to use paramiko, but it is pretty slow and for port forwarding requires
>>>> writing own local server <https://github.com/paramiko/paramiko/blob/master/demos/forward.py> in python. It is flexible, but it looks like an overkill to me.
>>>>
>>> I did some tests on p.haul/test/zdtm and here is what i've got:
>>> ssh + Popen = ~0.8 sec total.
>>> paramiko + python server = ~1.5 sec total.
>> OK. Plz, do one more attempt :) What if we ssh to remote host and launch the p.haul-service
>> there via this ssh session, not in advance. Would that look nicer in the code?
> 
> Oh, thats sounds great. It could be easily arranged into existing tunnel 
> command:
> ssh -o BatchMode=yes -L loc_port:localhost:rem_port user at rem 
> "p.haul-service --port rem_port"
> So I still think that using paramiko will be an overkill. Or you insist 
> on using it?

No, I just want to have the ssh tunnel that is easy to use and develop :)
If paramiko is just painful, then using plain ssh is OK.

>>>>> Another question -- how does this machinery works in qemu? Can you find out?
>>>> Qemu? Ok, i'll try.
>>>>
>>> Couldn't find anything suitable for our case.
>> How does it work?
>>
>>
> I didn't bother looking into source =), but judging from qemu wiki
> it is somehow streaming images between src and dest. Which
> doesn't seem suitable for us, as the heaviest imagages(pages) are
> handled by our page-server.
> .
>