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[Shraddha Pandhe <spandhe.openstack@xxxxxxxxx>]

Public bug reported:

Currently, Neutron's dhcp agent only supports Dnsmasq. Dnsmasq has a
very serious limitation that, it needs a reload any time when hosts,
opts or addn hosts configs are updated. According to a blog [1], this
can take unto 4 minutes with 65535 static leases.

Typical industry standard is to use isc-dhcpd [2] instead of Dnsmasq. In
general isc-dhcpd has more features than Dnsmasq. It also supports
OMAPI, which allows updating host or lease objects runtime. There are
two ways to use OMAPI: omshell [3] and pypureomapi python library [4],
[5]. With OMAPI, its very easy to selectively add/delete a host/lease
from configuration (as against updating full config on every
create/update port)

Considering that most of the industry uses isc-dhcpd, I think it will be
a great addition to OpenStack neutron.

[1] https://www.mirantis.com/blog/improving-dhcp-performance-openstack/
[2] https://www.isc.org/downloads/dhcp/
[3] http://linux.die.net/man/1/omshell
[4] https://pypi.python.org/pypi/pypureomapi
[5] https://github.com/CygnusNetworks/pypureomapi

** Affects: neutron
     Importance: Undecided
     Assignee: Shraddha Pandhe (shraddha-pandhe)
         Status: New


** Tags: rfe

** Tags added: rfe

** Changed in: neutron
     Assignee: (unassigned) => Shraddha Pandhe (shraddha-pandhe)

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https://bugs.launchpad.net/bugs/1464793

Title:
  Add a driver for isc-dhcpd

Status in OpenStack Neutron (virtual network service):
  New

Bug description:
  Currently, Neutron's dhcp agent only supports Dnsmasq. Dnsmasq has a
  very serious limitation that, it needs a reload any time when hosts,
  opts or addn hosts configs are updated. According to a blog [1], this
  can take unto 4 minutes with 65535 static leases.

  Typical industry standard is to use isc-dhcpd [2] instead of Dnsmasq.
  In general isc-dhcpd has more features than Dnsmasq. It also supports
  OMAPI, which allows updating host or lease objects runtime. There are
  two ways to use OMAPI: omshell [3] and pypureomapi python library [4],
  [5]. With OMAPI, its very easy to selectively add/delete a host/lease
  from configuration (as against updating full config on every
  create/update port)

  Considering that most of the industry uses isc-dhcpd, I think it will
  be a great addition to OpenStack neutron.

  [1] https://www.mirantis.com/blog/improving-dhcp-performance-openstack/
  [2] https://www.isc.org/downloads/dhcp/
  [3] http://linux.die.net/man/1/omshell
  [4] https://pypi.python.org/pypi/pypureomapi
  [5] https://github.com/CygnusNetworks/pypureomapi

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