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[LIU Yulong <1934646@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Each cases are sharing the common lease path for dhclient,
for instance, in CentOS it is: /var/lib/dhclient/dhclient.leases.
That means all fullstack cases will use this file to store
fake VM's NIC DHCP lease information.

After run several times of fullstack cases, the dhclient will
get failed to set the test fake VM port's IP due to the mess
settings in this file. Errors are:
"""
# ip netns exec test-f00c713e-97df-440a-9bd0-e88a0bc5ab38 dhclient -4 -sf /opt/stack/neutron/.tox/dsvm-fullstack/bin/fullstack-dhclient-script --no-pid -d port71fc1d
Internet Systems Consortium DHCP Client 4.2.5
Copyright 2004-2013 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
 
Can't allocate interface portd8lease {
  interface .
 
This version of ISC DHCP is based on the release available
on ftp.isc.org.  Features have been added and other changes
have been made to the base software release in order to make
it work better with this distribution.
 
Please report for this software via the CentOS Bugs Database:
    http://bugs.centos.org/
 
exiting.
"""


The mess settings looks like this:

}
lease {
  interface "portb88816 {
  interface "port71fd02";
  fixed-address 20.0.0.115;
...


There is a "{" after the port name.

Looks like there is a race condition among different cases, so this file
is rendered with broken settings.

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1934646

Title:
  fullstack fails locally after several times run due to shared dhclient
  lease file

Status in neutron:
  New

Bug description:
  Each cases are sharing the common lease path for dhclient,
  for instance, in CentOS it is: /var/lib/dhclient/dhclient.leases.
  That means all fullstack cases will use this file to store
  fake VM's NIC DHCP lease information.

  After run several times of fullstack cases, the dhclient will
  get failed to set the test fake VM port's IP due to the mess
  settings in this file. Errors are:
  """
  # ip netns exec test-f00c713e-97df-440a-9bd0-e88a0bc5ab38 dhclient -4 -sf /opt/stack/neutron/.tox/dsvm-fullstack/bin/fullstack-dhclient-script --no-pid -d port71fc1d
  Internet Systems Consortium DHCP Client 4.2.5
  Copyright 2004-2013 Internet Systems Consortium.
  All rights reserved.
  For info, please visit https://www.isc.org/software/dhcp/
   
  Can't allocate interface portd8lease {
    interface .
   
  This version of ISC DHCP is based on the release available
  on ftp.isc.org.  Features have been added and other changes
  have been made to the base software release in order to make
  it work better with this distribution.
   
  Please report for this software via the CentOS Bugs Database:
      http://bugs.centos.org/
   
  exiting.
  """

  
  The mess settings looks like this:

  }
  lease {
    interface "portb88816 {
    interface "port71fd02";
    fixed-address 20.0.0.115;
  ...

  
  There is a "{" after the port name.

  Looks like there is a race condition among different cases, so this
  file is rendered with broken settings.

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