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[varun kumar yadav <1831613@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Description ->Deletion of  loadbalancer   listener  is successfull  even
when  it is attached to Lbaas pool. After deletion of listener  when
user creates a new listener neutron Cli command do not support  addition
of new listener in existing lbaas pool.

User impact of deletion-> loadbalancer stops working if user  able to
delete listener accidentally

Step to reproduce the scenario->

neutron lbaas-loadbalancer-create --name lb-15 public-subnet
neutron lbaas-listener-create --name listener-15-1 --loadbalancer lb-15 --protocol HTTP --protocol-port 80 --connection-limit 1
neutron lbaas-pool-create --name pool-15 --lb-algorithm  ROUND_ROBIN  --listener listener-15-1  --protocol HTTP
neutron lbaas-healthmonitor-create --name health-15 --delay 5 --max-retries 4 --timeout 3 --type PING --pool pool-15
neutron lbaas-listener-delete <listener-id>

create a listener again and try to add to existing pool no cli support
this operation as well as no Horizon support for the same

Expected output-> Two approach to look for.

1. If deletion of listener is possible then addition of listener should
also be allowed.

2. Another option is if listener is mandatory field for pool creation
then like other field lbaaS listener  deletion  should throw an error.

version of openstack -> stable stein
linux ubuntu -> 18.04


Reason why it is needed:(while creation of listener is mandatory for a pool then deletion also should not be allowed without deleting pool).
 root@vmware:~/vio6.0# neutron lbaas-pool-create --name lb-pool2 --lb-algorithm ROUND_ROBIN --protocol HTTP --insecure
neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.
/usr/local/lib/python2.7/dist-packages/urllib3/connectionpool.py:857: InsecureRequestWarning: Unverified HTTPS request is being made. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
  InsecureRequestWarning)
/usr/local/lib/python2.7/dist-packages/urllib3/connectionpool.py:857: InsecureRequestWarning: Unverified HTTPS request is being made. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
  InsecureRequestWarning)
At least one of --listener or --loadbalancer must be specified.

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1831613

Title:
  Deletion of Lbaas-listener is successfull  even when it is part of
  Lbaas pool

Status in neutron:
  New

Bug description:
  Description ->Deletion of  loadbalancer   listener  is successfull
  even when  it is attached to Lbaas pool. After deletion of listener
  when user creates a new listener neutron Cli command do not support
  addition of new listener in existing lbaas pool.

  User impact of deletion-> loadbalancer stops working if user  able to
  delete listener accidentally

  Step to reproduce the scenario->

  neutron lbaas-loadbalancer-create --name lb-15 public-subnet
  neutron lbaas-listener-create --name listener-15-1 --loadbalancer lb-15 --protocol HTTP --protocol-port 80 --connection-limit 1
  neutron lbaas-pool-create --name pool-15 --lb-algorithm  ROUND_ROBIN  --listener listener-15-1  --protocol HTTP
  neutron lbaas-healthmonitor-create --name health-15 --delay 5 --max-retries 4 --timeout 3 --type PING --pool pool-15
  neutron lbaas-listener-delete <listener-id>

  create a listener again and try to add to existing pool no cli support
  this operation as well as no Horizon support for the same

  Expected output-> Two approach to look for.

  1. If deletion of listener is possible then addition of listener
  should also be allowed.

  2. Another option is if listener is mandatory field for pool creation
  then like other field lbaaS listener  deletion  should throw an error.

  version of openstack -> stable stein
  linux ubuntu -> 18.04


  
  Reason why it is needed:(while creation of listener is mandatory for a pool then deletion also should not be allowed without deleting pool).
   root@vmware:~/vio6.0# neutron lbaas-pool-create --name lb-pool2 --lb-algorithm ROUND_ROBIN --protocol HTTP --insecure
  neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.
  /usr/local/lib/python2.7/dist-packages/urllib3/connectionpool.py:857: InsecureRequestWarning: Unverified HTTPS request is being made. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
    InsecureRequestWarning)
  /usr/local/lib/python2.7/dist-packages/urllib3/connectionpool.py:857: InsecureRequestWarning: Unverified HTTPS request is being made. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
    InsecureRequestWarning)
  At least one of --listener or --loadbalancer must be specified.

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