139 lines
5.0 KiB
ReStructuredText
139 lines
5.0 KiB
ReStructuredText
.. _ovn_dhcp_opts:
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OVN supported DHCP options
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==========================
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This is a list of the current supported DHCP options in ML2/OVN:
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IP version 4
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~~~~~~~~~~~~
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========================== ============================
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Option name / code OVN value
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========================== ============================
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arp-timeout arp_cache_timeout
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bootfile-name bootfile_name
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classless-static-route classless_static_route
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default-ttl default_ttl
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dns-server dns_server
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domain-name domain_name
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ethernet-encap ethernet_encap
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ip-forward-enable ip_forward_enable
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lease-time lease_time
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log-server log_server
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lpr-server lpr_server
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ms-classless-static-route ms_classless_static_route
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mtu mtu
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netmask netmask
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nis-server nis_server
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ntp-server ntp_server
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path-prefix path_prefix
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policy-filter policy_filter
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router-discovery router_discovery
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router router
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router-solicitation router_solicitation
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server-id server_id
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server-ip-address tftp_server_address
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swap-server swap_server
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T1 T1
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T2 T2
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tcp-ttl tcp_ttl
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tcp-keepalive tcp_keepalive_interval
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tftp-server-address tftp_server_address
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tftp-server tftp_server
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wpad wpad
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1 netmask
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3 router
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6 dns_server
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7 log_server
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9 lpr_server
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15 domain_name
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16 swap_server
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19 ip_forward_enable
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21 policy_filter
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23 default_ttl
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26 mtu
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31 router_discovery
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32 router_solicitation
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35 arp_cache_timeout
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36 ethernet_encap
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37 tcp_ttl
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38 tcp_keepalive_interval
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41 nis_server
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42 ntp_server
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51 lease_time
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54 server_id
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58 T1
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59 T2
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66 tftp_server
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67 bootfile_name
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121 classless_static_route
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150 tftp_server_address
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210 path_prefix
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249 ms_classless_static_route
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252 wpad
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========================== ============================
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IP version 6
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~~~~~~~~~~~~
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================== =============
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Option name / code OVN value
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================== =============
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dns-server dns_server
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domain-search domain_search
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ia-addr ia_addr
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server-id server_id
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2 server_id
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5 ia_addr
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23 dns_server
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24 domain_search
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================== =============
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OVN Database information
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~~~~~~~~~~~~~~~~~~~~~~~~
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In OVN the DHCP options are stored on a table called ``DHCP_Options``
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in the OVN Northbound database.
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Let's add a DHCP option to a Neutron port:
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.. code-block:: bash
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$ neutron port-update --extra-dhcp-opt opt_name='server-ip-address',opt_value='10.0.0.1' b4c3f265-369e-4bf5-8789-7caa9a1efb9c
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Updated port: b4c3f265-369e-4bf5-8789-7caa9a1efb9c
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.. end
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To find that port in OVN we can use command below:
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.. code-block:: bash
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$ ovn-nbctl find Logical_Switch_Port name=b4c3f265-369e-4bf5-8789-7caa9a1efb9c
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...
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dhcpv4_options : 5f00d1a2-c57d-4d1f-83ea-09bf8be13288
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dhcpv6_options : []
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...
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.. end
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For DHCP, the columns that we care about are the ``dhcpv4_options``
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and ``dhcpv6_options``. These columns has the uuids of entries in the
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``DHCP_Options`` table with the DHCP information for this port.
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.. code-block:: bash
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$ ovn-nbctl list DHCP_Options 5f00d1a2-c57d-4d1f-83ea-09bf8be13288
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_uuid : 5f00d1a2-c57d-4d1f-83ea-09bf8be13288
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cidr : "10.0.0.0/26"
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external_ids : {"neutron:revision_number"="0", port_id="b4c3f265-369e-4bf5-8789-7caa9a1efb9c", subnet_id="5157ed8b-e7f1-4c56-b789-fa420098a687"}
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options : {classless_static_route="{169.254.169.254/32,10.0.0.2, 0.0.0.0/0,10.0.0.1}", dns_server="{8.8.8.8}", domain_name="\"openstackgate.local\"", lease_time="43200", log_server="127.0.0.3", mtu="1442", router="10.0.0.1", server_id="10.0.0.1", server_mac="fa:16:3e:dc:57:22", tftp_server_address="10.0.0.1"}
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.. end
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Here you can see that the option ``tftp_server_address`` has been set in
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the **options** column. Note that, the ``tftp_server_address`` option is
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the OVN translated name for ``server-ip-address`` (option 150). Take a
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look at the table in this document to find out more about the supported
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options and their counterpart names in OVN.
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