Neutron load balancer returns 503 response when load balancing algorithm is changed

[Igor Zinovik]

Affected version:
NSX Version: 6.1.4, Build: 2691049
Neutron NSX plugin 2015.1.2 (package is built using git tag 2015.1.2)

Scenario
a) create extern network "EXTERNAL_NET"
b) create tenant network "INTERNAL_NET" (DHCP enabled)
c) create exclusive router "ROUTER" and set gateway as "EXTERNAL_NET"
d) add interface to "ROUTER" in "INTERNAL_NET"
e) launch 2 instances in "INTERNAL_NET"
f) create load balancer pool "lb_http" with SOURCE_IP lb-algorithm in "INTERNAL_NET"
g) add both instances created in step e) as members in "lb_http" pool
h) create load balancer vIP "lb_vip" on port 80 in "INTERNAL_NET" for "lb_http" load balancer
i) assign floating IP on "lb_vip"
k) add permissive rule for HTTP traffic into 'default' security group
l) add healthmonitor for "lb_http" pool
m) check that load balancer works (make request with curl on vIP)
n) switch load balancer algorithm from SOURCE_IP to ROUND_ROBING for "lb_http"
m) check that load balancer works (make request with curl on vIP)

Expected result:
 load balancer works fine
Actual result:
 503 response

CLI commands scenario:
$ neutron net-create EXTERNAL --router:external --shared
$ neutron subnet-create --allocation-pool start=172.16.211.100,end=172.16.211.150 --gateway 172.16.211.1 --disable-dhcp EXTERNAL 172.16.211.0/24

$ neutron net-create INTERNAL_NET
$ neutron subnet-create INTERNAL_NET --name INTERNAL_NET-subnet 192.168.0.0/24

$ neutron router-create ROUTER --router_type exclusive
$ neutron router-interface-add ROUTER INTERNAL_NET-subnet
$ neutron router-gateway-set ROUTER EXTERNAL

$ nova boot --flavor m1.tiny --image TestVM-VMDK --nic net-id=$(neutron net-list|awk '/INTERNAL_NET/ {print $2}') INSTANCE1
$ nova boot --flavor m1.tiny --image TestVM-VMDK --nic net-id=$(neutron net-list|awk '/INTERNAL_NET/ {print $2}') INSTANCE2

$ fixedip_i1=$(nova list | awk '/INSTANCE1/ {print $12}' | awk -F '=' '{print $2}' | awk -F ',' '{print $1}')
$ fixedip_i2=$(nova list | awk '/INSTANCE2/ {print $12}' | awk -F '=' '{print $2}' | awk -F ',' '{print $1}')

$ neutron lb-pool-create --lb-method SOURCE_IP --name lb_http --protocol HTTP --subnet-id $(neutron subnet-list|awk '/INTERNAL_NET/ {print $2}')

$ neutron lb-member-create --protocol-port 80 lb_http --address $fixedip_i1
$ neutron lb-member-create --protocol-port 80 lb_http --address $fixedip_i2

$ neutron lb-vip-create --name lb_vip --subnet-id $(neutron subnet-list|awk '/INTERNAL_NET/ {print $2}') --protocol-port 80 --protocol HTTP lb_http
$ fixedip_vip=$(neutron lb-vip-list | awk '/lb_vip/ {print $6}')
$ portuuid_vip=$(neutron port-list | grep $fixedip_vip | awk '{print $2}')
$ neutron floatingip-create EXTERNAL --port-id $portuuid_vip

$ neutron security-group-rule-create --protocol tcp --port-range-min 80 --port-range-max 80 $(neutron security-group-list |awk '/default/ {print $2}'|head -n 1)

$ neutron lb-healthmonitor-create --max-retries 2 --timeout 2 --delay 2 --type HTTP
$ neutron lb-healthmonitor-associate $(neutron lb-healthmonitor-list|awk '/HTTP/ {print $2}') lb_http

test load balancer with curl

$ neutron lb-pool-update lb_http --lb-method ROUND_ROBIN

test load balancer with curl

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/259883
Committed: https://git.openstack.org/cgit/openstack/vmware-nsx/commit/?id=588f84bf7b6c2ef8564600723048042113c7f3f9
Submitter: Jenkins
Branch: master

commit 588f84bf7b6c2ef8564600723048042113c7f3f9
Author: Kobi Samoray <email address hidden>
Date: Mon Dec 21 10:17:46 2015 +0200

    Update pool erases member config

    When a LBaaSv1 pool is being updated, the update erases the pool config.

    Change-Id: Ib0fab216c5affa0c3075689c8e7dd8b1c9e18598
    Fixes-Bug: #1527178

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/liberty
Review: https://review.openstack.org/260915

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/260915
Committed: https://git.openstack.org/cgit/openstack/vmware-nsx/commit/?id=5b744c7dacb6bbcbf90d2c295816b3d677fec1e3
Submitter: Jenkins
Branch: stable/liberty

commit 5b744c7dacb6bbcbf90d2c295816b3d677fec1e3
Author: Kobi Samoray <email address hidden>
Date: Mon Dec 21 10:17:46 2015 +0200

    Update pool erases member config

    When a LBaaSv1 pool is being updated, the update erases the pool config.

    Conflicts:
     vmware_nsx/plugins/nsx_v/vshield/edge_loadbalancer_driver.py
     vmware_nsx/tests/unit/nsx_v/test_edge_loadbalancer_driver.py

    Fixes-Bug: #1527178
    Change-Id: Ib0fab216c5affa0c3075689c8e7dd8b1c9e18598
    (cherry picked from commit 588f84bf7b6c2ef8564600723048042113c7f3f9)