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Hi All,

'subnet_id' attribute of LBaaS Pool resource has been documented as "The network that pool members belong to"

However, with 'HAProxy' driver, it allows to add members belonging to different subnets/networks to a lbaas Pool.  

It also allows to create VIP from a separate subnet than the pool. I could see there is a validation in horizon that restricts vip to the subnet of the pool. 

My understanding is that a Pool with a specific subnet, would allow members from the same  subnet and the VIP would be also of the same subnet.

Can someone please help clarify the design consideration?



[stack at devstack-rabi devstack]$ neutron lb-pool-create --name http-pool --lb-method ROUND_ROBIN --protocol HTTP --subnet-id 547f99da-7dd5
[stack at devstack-rabi devstack]$ neutron lb-pool-list
+--------------------------------------+-----------+----------+-------------+----------+----------------+--------+
| id                                   | name      | provider | lb_method   | protocol | admin_state_up | status |
+--------------------------------------+-----------+----------+-------------+----------+----------------+--------+
| 8235339a-4158-468b-9377-5ece0826e7a6 | http-pool | haproxy  | ROUND_ROBIN | HTTP     | True           | ACTIVE |
+--------------------------------------+-----------+----------+-------------+----------+----------------+--------+

[stack at devstack-rabi devstack]$ neutron lb-member-create --address 10.0.0.2 --protocol-port 80 http-pool
Created a new member:
+--------------------+--------------------------------------+
| Field              | Value                                |
+--------------------+--------------------------------------+
| address            | 10.0.0.2                             |
| admin_state_up     | True                                 |
| id                 | e9515a09-1a95-4875-b45f-3b2bab559eb8 |
| pool_id            | 8235339a-4158-468b-9377-5ece0826e7a6 |
| protocol_port      | 80                                   |
| status             | PENDING_CREATE                       |
| status_description |                                      |
| tenant_id          | c46ae2b06ee54d06828c346f77fb5628     |
| weight             | 1                                    |
+--------------------+--------------------------------------+
[stack at devstack-rabi devstack]$ neutron lb-member-create --address 10.10.0.2 --protocol-port 80 http-pool
Created a new member:
+--------------------+--------------------------------------+
| Field              | Value                                |
+--------------------+--------------------------------------+
| address            | 10.10.0.2                            |
| admin_state_up     | True                                 |
| id                 | 4f4ecd2d-b734-4a98-95ac-06d9d09ddb62 |
| pool_id            | 8235339a-4158-468b-9377-5ece0826e7a6 |
| protocol_port      | 80                                   |
| status             | PENDING_CREATE                       |
| status_description |                                      |
| tenant_id          | c46ae2b06ee54d06828c346f77fb5628     |
| weight             | 1                                    |
+--------------------+--------------------------------------+
[stack at devstack-rabi devstack]$ neutron lb-member-list --sort-key address --sort-dir asc
+--------------------------------------+-----------+---------------+--------+----------------+--------+
| id                                   | address   | protocol_port | weight | admin_state_up | status |
+--------------------------------------+-----------+---------------+--------+----------------+--------+
| 4f4ecd2d-b734-4a98-95ac-06d9d09ddb62 | 10.10.0.2 |            80 |      1 | True           | ACTIVE |
| e9515a09-1a95-4875-b45f-3b2bab559eb8 | 10.0.0.2  |            80 |      1 | True           | ACTIVE |
+--------------------------------------+-----------+---------------+--------+----------------+--------+


[stack at devstack-rabi devstack]$ neutron lb-vip-create --name http-vip --protocol-port 80 --protocol HTTP --subnet-id b1557101-c8f1-415a-846d-6d165a8e8fc2 8235339a-4158-468b-9377-5ece0826e7a6

Created a new vip:
+---------------------+--------------------------------------+
| Field               | Value                                |
+---------------------+--------------------------------------+
| address             | 10.10.0.4                            |
| admin_state_up      | True                                 |
| connection_limit    | -1                                   |
| description         |                                      |
| id                  | 409e72e6-5a3c-4a7b-be0b-6a8784193dfc |
| name                | http-vip                             |
| pool_id             | 8235339a-4158-468b-9377-5ece0826e7a6 |
| port_id             | 9dfc3a6f-4641-4f1d-835b-bda3aea9c6ce |
| protocol            | HTTP                                 |
| protocol_port       | 80                                   |
| session_persistence |                                      |
| status              | PENDING_CREATE                       |
| status_description  |                                      |
| subnet_id           | b1557101-c8f1-415a-846d-6d165a8e8fc2 |
| tenant_id           | c46ae2b06ee54d06828c346f77fb5628     |
+---------------------+--------------------------------------+
[stack at devstack-rabi devstack]$ neutron lb-vip-list
+--------------------------------------+----------+-----------+----------+----------------+--------+
| id                                   | name     | address   | protocol | admin_state_up | status |
+--------------------------------------+----------+-----------+----------+----------------+--------+
| 409e72e6-5a3c-4a7b-be0b-6a8784193dfc | http-vip | 10.10.0.4 | HTTP     | True           | ACTIVE |
+--------------------------------------+----------+-----------+----------+----------------+--------+
   


Regards,
Rabi Mishra