cd66232c2b
It also adds 2 sample of devstack's local.conf file for deploying Neutron with OVN mechanism driver. Needed to create PNG files out of the existing SVG ones in order to pass the pdf doc build. Co-Authored-By: Aaron Rosen <aaronorosen@gmail.com> Co-Authored-By: Akihiro Motoki <amotoki@gmail.com> Co-Authored-By: Amitabha Biswas <abiswas@us.ibm.com> Co-Authored-By: Andreas Jaeger <aj@suse.com> Co-Authored-By: Anh Tran <anhtt@vn.fujitsu.com> Co-Authored-By: Assaf Muller <amuller@redhat.com> Co-Authored-By: Babu Shanmugam <bschanmu@redhat.com> Co-Authored-By: Brian Haley <bhaley@redhat.com> Co-Authored-By: Chandra S Vejendla <csvejend@us.ibm.com> Co-Authored-By: Daniel Alvarez <dalvarez@redhat.com> Co-Authored-By: Dong Jun <dongj@dtdream.com> Co-Authored-By: Emilien Macchi <emilien@redhat.com> Co-Authored-By: Flavio Fernandes <flavio@flaviof.com> Co-Authored-By: Gal Sagie <gal.sagie@huawei.com> Co-Authored-By: Gary Kotton <gkotton@vmware.com> Co-Authored-By: Guoshuai Li <ligs@dtdream.com> Co-Authored-By: Han Zhou <zhouhan@gmail.com> Co-Authored-By: Hong Hui Xiao <xiaohhui@cn.ibm.com> Co-Authored-By: Jakub Libosvar <libosvar@redhat.com> Co-Authored-By: Jeff Feng <jianhua@us.ibm.com> Co-Authored-By: Jenkins <jenkins@review.openstack.org> Co-Authored-By: Jonathan Herlin <jonte@jherlin.se> Co-Authored-By: Kyle Mestery <mestery@mestery.com> Co-Authored-By: Le Hou <houl7@chinaunicom.cn> Co-Authored-By: Lucas Alvares Gomes <lucasagomes@gmail.com> Co-Authored-By: Matthew Kassawara <mkassawara@gmail.com> Co-Authored-By: Miguel Angel Ajo <majopela@redhat.com> Co-Authored-By: Murali Rangachari <muralirdev@gmail.com> Co-Authored-By: Numan Siddique <nusiddiq@redhat.com> Co-Authored-By: Reedip <rbanerje@redhat.com> Co-Authored-By: Richard Theis <rtheis@us.ibm.com> Co-Authored-By: Russell Bryant <rbryant@redhat.com> Co-Authored-By: Ryan Moats <rmoats@us.ibm.com> Co-Authored-By: Simon Pasquier <spasquier@mirantis.com> Co-Authored-By: Terry Wilson <twilson@redhat.com> Co-Authored-By: Tong Li <litong01@us.ibm.com> Co-Authored-By: Yunxiang Tao <taoyunxiang@cmss.chinamobile.com> Co-Authored-By: Yushiro FURUKAWA <y.furukawa_2@jp.fujitsu.com> Co-Authored-By: chen-li <shchenli@cn.ibm.com> Co-Authored-By: gong yong sheng <gong.yongsheng@99cloud.net> Co-Authored-By: lidong <lidongbj@inspur.com> Co-Authored-By: lzklibj <lzklibj@cn.ibm.com> Co-Authored-By: melissaml <ma.lei@99cloud.net> Co-Authored-By: pengyuesheng <pengyuesheng@gohighsec.com> Co-Authored-By: reedip <rbanerje@redhat.com> Co-Authored-By: venkata anil <anilvenkata@redhat.com> Co-Authored-By: xurong00037997 <xu.rong@zte.com.cn> Co-Authored-By: zhangdebo <zhangdebo@inspur.com> Co-Authored-By: zhangyanxian <zhang.yanxian@zte.com.cn> Co-Authored-By: zhangyanxian <zhangyanxianmail@163.com> Change-Id: Ia121ec5146c1d35b3282e44fd1eb98932939ea8c Partially-Implements: blueprint neutron-ovn-merge
2.2 KiB
Using the native DHCP feature provided by OVN
DHCPv4
OVN implements a native DHCPv4 support which caters to the common use case of providing an IP address to a booting instance by providing stateless replies to DHCPv4 requests based on statically configured address mappings. To do this it allows a short list of DHCPv4 options to be configured and applied at each compute host running ovn-controller.
OVN northbound db provides a table 'DHCP_Options' to store the DHCP options. Logical switch port has a reference to this table.
When a subnet is created and enable_dhcp is True, a new entry is created in this table. The 'options' column stores the DHCPv4 options. These DHCPv4 options are included in the DHCPv4 reply by the ovn-controller when the VIF attached to the logical switch port sends a DHCPv4 request.
In order to map the DHCP_Options row with the subnet, the OVN ML2 driver stores the subnet id in the 'external_ids' column.
When a new port is created, the 'dhcpv4_options' column of the logical switch port refers to the DHCP_Options row created for the subnet of the port. If the port has multiple IPv4 subnets, then the first subnet in the 'fixed_ips' is used.
If the port has extra DHCPv4 options defined, then a new entry is created in the DHCP_Options table for the port. The default DHCP options are obtained from the subnet DHCP_Options table and the extra DHCPv4 options of the port are overridden. In order to map the port DHCP_Options row with the port, the OVN ML2 driver stores both the subnet id and port id in the 'external_ids' column.
If admin wants to disable native OVN DHCPv4 for any particular port, then the admin needs to define the 'dhcp_disabled' with the value 'true' in the extra DHCP options.
Ex. neutron port-update <PORT_ID> --extra-dhcp-opt ip_version=4, opt_name=dhcp_disabled, opt_value=false
DHCPv6
OVN implements a native DHCPv6 support similar to DHCPv4. When a v6 subnet is created, the OVN ML2 driver will insert a new entry into DHCP_Options table only when the subnet 'ipv6_address_mode' is not 'slaac', and enable_dhcp is True.