Re: [Need Help] Arbitrary connection port is part of the node-id


Amit Mandke (ammandke) <ammandke@...>
 

It sounds tricky, cause once you register for callbacks you can’t be sure of the sequence of all the updates right? Or even guaranty if each update would be processed?

So essentially you are letting go a sure-shot event where you received the connection to store the OVSDB node and relying on the future updates to create it.

I am not sure if that is the best thing to do.

-Amit


From: Edward Warnicke <hagbard@...>
Date: Friday, April 24, 2015 at 11:07 AM
To: "Prateek Garg (prategar)" <prategar@...>
Cc: "ovsdb-dev@..." <ovsdb-dev@...>
Subject: Re: [ovsdb-dev] [Need Help] Arbitrary connection port is part of the node-id

I had an idea last night as I was falling asleep that might be interesting.

How about we create the ovsdb-node in operational with the OpenVSwitchUpdateCommand (which should get tripped with the original dump of data from ovsdb on connect) rather than invoking OvsdbNodeCreatedCommand in the OvsdbConnectionInstance() constructor.  That way you have access to the info you need, don't have to do a select (and thus a new round trip) etc.

Thoughts?

Ed

On Wed, Apr 22, 2015 at 3:40 PM, Prateek Garg (prategar) <prategar@...> wrote:

This can be done in OvsdbNodeCreateCommand. The issue I see there is changing the signature of the OvsdbNodeCreateCommand’s constructor.
Let me know if its ok to change the signature and pass OvsdbClient.
However, I believe still we would need to run a select statement to get the system-id in OvsdbNodeCreateCommand.

Please let me know your thoughts.

Thanks
Prateek

From: Edward Warnicke <hagbard@...>
Date: Wednesday, April 22, 2015 at 3:26 PM

To: Prateek Garg <prategar@...>
Cc: "ovsdb-dev@..." <ovsdb-dev@...>, "ffernand@..." <ffernand@...>
Subject: Re: [ovsdb-dev] [Need Help] Arbitrary connection port is part of the node-id

And why change ConnectionInfo (that really really is info about the ip and port...)

Ed

On Wed, Apr 22, 2015 at 3:25 PM, Edward Warnicke <hagbard@...> wrote:
Prateek,

Question... why not in the OvsdbNodeCreateCommand where all of the other operational info is being created and written?

Ed

On Wed, Apr 22, 2015 at 3:22 PM, Prateek Garg (prategar) <prategar@...> wrote:
Hi Ed,

The way I am implementing this is:

In OvsdbConnectionManager’s connected method, I’ll set system-Id from external_ids of open_Vswitch table in ConnectionInfo key (I’ll modify yang to add systemId field in connectionInfo to add system-id). Therefore to get the system-id in OvsdbConnectionManager’s connected method, I need to execute select operation on open_Vswitch table. 
So later when OvsdbNodeCreateCommand is called with ConnectionInfo, I’ll have the systemId to write to operation store.

Please let me know your thoughts on this approach.

Regards
Prateek

From: Edward Warnicke <hagbard@...>
Date: Wednesday, April 22, 2015 at 2:58 PM
To: Prateek Garg <prategar@...>
Cc: "ovsdb-dev@..." <ovsdb-dev@...>, "ffernand@..." <ffernand@...>
Subject: Re: [ovsdb-dev] [Need Help] Arbitrary connection port is part of the node-id

Prateek,

Why are you doing a select? (curious) :)

Ed

On Wed, Apr 22, 2015 at 2:54 PM, Prateek Garg (prategar) <prategar@...> wrote:
Hi,

While implementing this use case I need some help using the select operation of ovsdb library. I am trying to read the Open_vSwitch table to get the data in external-ids. I am doing the following:

OpenVSwitch ovs = TyperUtils.getTypedRowWrapper(dbSchema, OpenVSwitch.class);

                transaction.add(op.select(ovs.getSchema()));

                ListenableFuture<List<OperationResult>> results = transaction.execute();

List<OperationResult> resultList = results.get();


I am getting resultList as:

[OperationResult [count=0, uuid=null, rows=[Row [columns={}]], error=null, details=null]]

Query sent to Ovs db is:

ovsdb-client transact '["Open_vSwitch",{"op":"select", "table":"Open_vSwitch", "columns":[],"where": []}]'


However, I want to send:

ovsdb-client transact '["Open_vSwitch",{"op":"select", "table":"Open_vSwitch", "columns":["external_ids"],"where": []}]'


It would be very helpful if someone could provide pointers on how to set column in select operation.


Regards

Prateek


From: Edward Warnicke <hagbard@...>
Date: Tuesday, April 21, 2015 at 1:18 PM
To: Prateek Garg <prategar@...>
Cc: "ffernand@..." <ffernand@...>, "ovsdb-dev@..." <ovsdb-dev@...>

Subject: Re: [ovsdb-dev] Arbitrary connection port is part of the node-id

The config/operational synch is best handled a little differently.

When you try to config an ovsdb-node to connect... you don't *really* know the systemid... just the IP:port.

The way we solved this for bridges, and the way I'd advocate solving it here is:

1)  If you are configing a ovsdb-node, write its iid to the external-ids of the openvswitch table
2)  When you get an openvswitch table, if it has an iid in its external-ids, use that in the operational data store as its iid
3)  If you don't get an iid in its external-ids... use some reasonable heuristic to contruct one.

For #3... I don't currently see a reason *not* to use systemid presuming its guaranteed unique and we contruct some kind of reasonable
Uri from it.

Ed

On Tue, Apr 21, 2015 at 1:09 PM, Prateek Garg (prategar) <prategar@...> wrote:
Hi,

In my opinion, the we can replace the node-id of the ovsdb node in md-sal to contain system_id from external properties. This would make sure that the config and operation store are in synch in case the controller reconnects to the same ovs in tcp mode.
I’ll make these changes, update postman collection and submit for approval. 

Regards
Prateek

----------------------------------------------------------------------
Date: Mon, 20 Apr 2015 21:28:28 -0700
From: Edward Warnicke <hagbard@...>
To: Flavio Fernandes <ffernand@...>
Subject: Re: [ovsdb-dev] Arbitrary connection port is part of the
node-id
Message-ID:
Content-Type: text/plain; charset="utf-8"

Make sure we build in the same mechanism of storing iids in external_ids
that we use for bridges so that if someone configures a connection as an
ovsdb-node, it comes *back* in operational store with the same iid...

Ed

On Mon, Apr 20, 2015 at 8:12 PM, Flavio Fernandes <ffernand@...>
wrote:


> On Apr 20, 2015, at 7:12 PM, Sharon Aicler (saichler) <
saichler@...> wrote:
>
> Hi,
> A further investigation by Amit has revealed that the system uuid is
automatically set by the OVS so we can use it out of the box to identify an
OVS instance. To see the external ID you can invoke the following cli:
>
> ovs-vsctl --columns=external-ids list open_vswitch
>
> looks like a win/win situation to me...:o)
>

ok!

? flavio



> Thanks,
>          Sharon.
> ________________________________________
ovsdb-dev-bounces@...] on behalf of Sharon Aicler
(saichler)
> Sent: Monday, April 20, 2015 3:41 PM
> To: Flavio Fernandes
> Subject: Re: [ovsdb-dev] Arbitrary connection port is part of the node-id
>
> In that case you are kind of "gambling" that two of your dockers won't
choose the same arbitrary port...:o)
> In any case, we can't have the ID of an element arbitrary change all the
time...As a quick and dirty fix, i would drop the port (and the "behind a
NAT" scenario) so ovsdb id's would be predictable and not change per
connection (it can even change in run-time if there was some network
connectivity issue)...
>
> A more suitable solution is probably generating and assigning a uuid to
each of the managed instances, if one does not exist...a quick googling i
found the following cli method:
>
> ovs-vsctl set open_vswitch . external-ids:system-id='"${UUID}"'
>
>
> Thanks,
>         Sharon.
> ________________________________________
> From: Flavio Fernandes [ffernand@...]
> Sent: Monday, April 20, 2015 1:25 PM
> To: Sharon Aicler (saichler)
> Subject: Re: [ovsdb-dev] Arbitrary connection port is part of the node-id
>
>> On Apr 20, 2015, at 3:24 PM, Sharon Aicler (saichler) <
saichler@...> wrote:
>>
>> Hi,
>> Sorry, but does't a docker has a unique ip?
>
> yes and no. ;) I?m used to see docker behind nat on the vm that hosts
the containers. Then, from
> 'outside' the vm, various ovs instances reached using the same ip, but
different ports. Like this:
>
>        docker run -p 16640:6640 blablabla
>        docker run -p 16641:6640 blablabla
>        docker run -p 16642:6640 blablabla
>        ?
>
> ? flavio
>
>
>
>> ________________________________________
>> From: Flavio Fernandes [ffernand@...]
>> Sent: Friday, April 17, 2015 4:23 AM
>> To: Sharon Aicler (saichler)
>> Subject: Re: [ovsdb-dev] Arbitrary connection port is part of the
node-id
>>
>>> On Apr 16, 2015, at 6:53 PM, Sharon Aicler (saichler) <
saichler@...> wrote:
>>>
>>> Hi all,
>>> The node-id of an ovs bridge contains the arbitrary port of the
outgoing connection instance and looks something like the following:
>>>
>>> This creates an issue if i place something in the configuration store
and the connection goes down due to some reason, the node-id will change
each time the connection is lost or I restart ODL/OVSDB.
>>> Any reason for this? can't we just use the ip? i don't think you can
run two instances of OVS in the same VM?
>>>
>>
>> Hi Sharon,
>>
>> That is not true. I?ve seen a VM with many OVS instances running;
mostly in a docker environment.
>>
>> But I see your point. When OVS is connecting to ODL (i.e. active
method) the port is not predictable. When ODL connects to
>> an OVS (passive mode), ODL will need to know that port, tho; so the
solution to this problem should ideally work on both
>> scenarios.
>>
>> ? flavio
>>
>>
>>
>>>
>>> Thanks,
>>>        Sharon.
>>> _______________________________________________
>>> ovsdb-dev mailing list
> _______________________________________________
> ovsdb-dev mailing list

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