+1
Note that beyond the DB, the change should also be reflected into the
cr-config.
As I see it, a flexible model may be built of the below items:
1 - Edge server.
2- Interface
3. IPs
The Interface (or should it be called "delivery unit") is the element we
redirect the traffic to and which is monitored by the traffic-monitor:
* Each server may have multiple interfaces
* Each interface may have multiple IPs
* Interfaces has priorities (abstraction for primary/secondary)
* Each interface is given a seperate DNS name by the router. Single name
for the multiple IPs.
* Each interface is monitored and reported seperately by the traffic
monitor, including health an stats.
The router "redirect target decision" may look as follows
0. Select cache as we do today taking into account the consistent hash. A
server is in the selection group only if one of its interfaces is found to
be healthy
1. Once we have server selected, select an interface out of all interfaces
of the server with max available priority.
An additional improvement, may assign DS to interfaces instead of servers.
A server serves DS X iff one of its interfaces is assigned to the DS.
Nir
On Apr 4, 2018 6:56 AM, "Zhilin Huang (zhilhuan)" <zhilh...@cisco.com>
wrote:
Updated the DB schema in section 3.1.1.4
Thanks,
Zhilin
On 04/04/2018, 11:02 AM, "Zhilin Huang (zhilhuan)" <zhilh...@cisco.com>
wrote:
Good points. I am happy to make this change in the design doc.
Thanks,
Zhilin
On 03/04/2018, 8:17 PM, "Eric Friedrich (efriedri)" <efrie...@cisco.com>
wrote:
I would prefer a consistent way to store all interface and IP
address information. Its good database design practice to store similar
information in similar tables (i.e. all IP info in 1 table) rather than
keep some IPs in the server table and some IPs in another table.
I also think this refactoring will give us greater flexibility for
more changes in the future. Outside of this particular use case, we might
have additional features like sharing edges between public/private networks
or having multiple (equal priority) streaming interfaces on a cache.
These future features would be easier if the interface data and IP
data is all organized into separate tables.
I’d also like to see the delivery service to IP mapping be a many
to many mapping in the DB. For this particular feature we will only assign
a single IP (and we can restrict that in the API if we want), but I am near
certain that in the future we would like the ability to assign a DS to
multiple IPs on the same cache.
—Eric
> On Apr 3, 2018, at 2:42 AM, Zhilin Huang (zhilhuan) <
zhilh...@cisco.com> wrote:
>
> Hi Mark,
>
> Thanks for your comments. Please check my reply in another thread:
>
> If we all agreed to use unified tables for all IPs and/or
interfaces: primary, management, secondary, then there need to be two
tables: IP and interface.
> And in the server table, we need to replace the original
"interface_xxx", "ip_xxx", "ip6_xxx" fields with a "primary_ip_id" field.
And do similar things to management IP.
>
> Thanks,
> Zhilin
>
>
> On 03/04/2018, 7:08 AM, "Mark Torluemke" <mtorlue...@apache.org>
wrote:
>
> I would support an 'interfaces' table (adding some sort of a
'type' column)
> that would include moving the management and lights out
management
> interfaces to that table as well.
>
> Cheers,
> Mark
>
> On Mon, Apr 2, 2018 at 2:39 PM, Nir Sopher <n...@qwilt.com>
wrote:
>
>> Hi Zhilin,
>>
>> I took a quick look into the spec. Hope to have the opportunity
to dive
>> deeper into it soon so we can further discuss it.
>>
>> For now I have a 2 questions.
>> In the spec, you refer to "secondary interfaces", and you have a
list of
>> secondary interfaces added.
>> IIUC the secondary interfaces are used as long as they are
available, and
>> when down, you move to the primary interface.
>>
>> Why not, instead of holding a secondary interfaces table, move
all
>> interfaces to a separate table? Primary and secondary.
>> For each interface you can hold:
>>
>> - Server id
>> - name (e.g. eth0)
>> - IPv6
>> - IPv4
>> - Priority (Integer as flexible as you wish: e.g. "1" for
"secondary",
>> "2" for "primary" in your example,)
>>
>>
>> Additionally, it is not clear to me what happens if one of the
interfaces
>> fails?
>> Does every interface has a unique DNS name? If an interface
fails, are
>> redirects
>> sent only to the available (secondary) interfaces?
>>
>> Thanks,
>> Nir
>>
>>
>> On Mon, Apr 2, 2018 at 10:21 AM, Zhilin Huang (zhilhuan) <
>> zhilh...@cisco.com
>>> wrote:
>>
>>> Hi Guys,
>>>
>>> This was originally posted in another discussion. Resend this
in a
>>> standalone topic to catch more awareness. The link for the
design doc:
>>>
https://docs.google.com/document/d/1vgq-pGNoLLYf7Y3cu5hWu67TUKpN5hucrp
>>> -ZS9nSsd4/edit?usp=sharing
>>>
>>>
>>> Short summary for the feature design:
>>> ---
>>> There is feature request from market to add secondary IPs
support on edge
>>> cache servers, and the functionality to assign a delivery
service to a
>>> secondary IP of an edge cache.
>>>
>>> This feature requires Traffic Ops implementation to support
secondary IP
>>> configuration for edge cache, and delivery service assignment to
>> secondary
>>> IP.
>>>
>>> Traffic Monitor should also monitor connectivity of secondary
IPs
>>> configured. And Traffic Router needs support to resolve
streamer FQDN to
>>> secondary IP assigned in a delivery service.
>>>
>>> Traffic Server should record the IP serving client request. And
should
>>> reject request to an unassigned IP for a delivery service.
>>>
>>> This design has taken compatibility into consideration: if no
secondary
>> IP
>>> configured, or some parts of the system has not been upgraded
to the
>>> version supports this feature, the traffic will be served by
primary IPs
>> as
>>> before.
>>> ---
>>>
>>> Much appreciated and welcome to any comments. If no major
objections, we
>>> planned to start coding this week.
>>>
>>> Thanks,
>>> Zhilin
>>>
>>>
>>
>
>
