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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: neutron
       Status: Fix Committed => Fix Released

** Changed in: neutron
    Milestone: None => juno-1

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https://bugs.launchpad.net/bugs/1302283

Title:
  LBaaS Haproxy occurs error if no member is added

Status in OpenStack Neutron (virtual network service):
  Fix Released

Bug description:
  if VIP (only with session_persistence=HTTP_COOKIE)&Pool without one
  member added, the Haproxy agent would report config file error like
  the following:

  2014-04-02 10:14:10.632 17283 DEBUG neutron.openstack.common.lockutils [req-18b873c4-abd7-4483-824f-f553c29ae549 None] Semaphore / lock released "deploy_instance" inner /opt/stack/neutron/neutron/openstack/common/lockutils.py:252
  2014-04-02 10:14:10.633 17283 ERROR neutron.services.loadbalancer.agent.agent_manager [req-18b873c4-abd7-4483-824f-f553c29ae549 None] Unable to deploy instance for pool: a61dd6b6-8dbe-4576-b213-f8632892a58c
  2014-04-02 10:14:10.633 17283 TRACE neutron.services.loadbalancer.agent.agent_manager Traceback (most recent call last):
  2014-04-02 10:14:10.633 17283 TRACE neutron.services.loadbalancer.agent.agent_manager   File "/opt/stack/neutron/neutron/services/loadbalancer/agent/agent_manager.py", line 180, in _reload_pool
  2014-04-02 10:14:10.633 17283 TRACE neutron.services.loadbalancer.agent.agent_manager     self.device_drivers[driver_name].deploy_instance(logical_config)
  2014-04-02 10:14:10.633 17283 TRACE neutron.services.loadbalancer.agent.agent_manager   File "/opt/stack/neutron/neutron/openstack/common/lockutils.py", line 249, in inner
  2014-04-02 10:14:10.633 17283 TRACE neutron.services.loadbalancer.agent.agent_manager     return f(*args, **kwargs)
  2014-04-02 10:14:10.633 17283 TRACE neutron.services.loadbalancer.agent.agent_manager   File "/opt/stack/neutron/neutron/services/loadbalancer/drivers/haproxy/namespace_driver.py", line 280, in deploy_instance
  2014-04-02 10:14:10.633 17283 TRACE neutron.services.loadbalancer.agent.agent_manager     self.update(logical_config)
  2014-04-02 10:14:10.633 17283 TRACE neutron.services.loadbalancer.agent.agent_manager   File "/opt/stack/neutron/neutron/services/loadbalancer/drivers/haproxy/namespace_driver.py", line 95, in update
  2014-04-02 10:14:10.633 17283 TRACE neutron.services.loadbalancer.agent.agent_manager     self._spawn(logical_config, extra_args)
  2014-04-02 10:14:10.633 17283 TRACE neutron.services.loadbalancer.agent.agent_manager   File "/opt/stack/neutron/neutron/services/loadbalancer/drivers/haproxy/namespace_driver.py", line 110, in _spawn
  2014-04-02 10:14:10.633 17283 TRACE neutron.services.loadbalancer.agent.agent_manager     ns.netns.execute(cmd)
  2014-04-02 10:14:10.633 17283 TRACE neutron.services.loadbalancer.agent.agent_manager   File "/opt/stack/neutron/neutron/agent/linux/ip_lib.py", line 466, in execute
  2014-04-02 10:14:10.633 17283 TRACE neutron.services.loadbalancer.agent.agent_manager     check_exit_code=check_exit_code)
  2014-04-02 10:14:10.633 17283 TRACE neutron.services.loadbalancer.agent.agent_manager   File "/opt/stack/neutron/neutron/agent/linux/utils.py", line 76, in execute
  2014-04-02 10:14:10.633 17283 TRACE neutron.services.loadbalancer.agent.agent_manager     raise RuntimeError(m)
  2014-04-02 10:14:10.633 17283 TRACE neutron.services.loadbalancer.agent.agent_manager RuntimeError:
  2014-04-02 10:14:10.633 17283 TRACE neutron.services.loadbalancer.agent.agent_manager Command: ['sudo', '/usr/local/bin/neutron-rootwrap', '/etc/neutron/rootwrap.conf', 'ip', 'netns', 'exec', 'qlbaas-a61dd6b6-8dbe-4576-b213-f8632892a58c', 'haproxy', '-f', '/opt/stack/data/neutron/lbaas/a61dd6b6-8dbe-4576-b213-f8632892a58c/conf', '-p', '/opt/stack/data/neutron/lbaas/a61dd6b6-8dbe-4576-b213-f8632892a58c/pid', '-sf', '4524']
  2014-04-02 10:14:10.633 17283 TRACE neutron.services.loadbalancer.agent.agent_manager Exit code: 1
  2014-04-02 10:14:10.633 17283 TRACE neutron.services.loadbalancer.agent.agent_manager Stdout: ''
  2014-04-02 10:14:10.633 17283 TRACE neutron.services.loadbalancer.agent.agent_manager Stderr: '[ALERT] 091/101410 (20752) : config : HTTP proxy a61dd6b6-8dbe-4576-b213-f8632892a58c has a cookie but no server list !\n[ALERT] 091/101410 (20752) : Fatal errors found in configuration.\n'
  2014-04-02 10:14:10.633 17283 TRACE neutron.services.loadbalancer.agent.agent_manager

  I think one solution: check the member list, if no member exists,
  Haproxy agent would not deploy the instance or undeploy existed
  haproxy process.

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