Self-service networks¶
A self-service (project) network includes only virtual components, thus enabling projects to manage them without additional configuration of the underlying physical network. The OVN mechanism driver supports Geneve and VLAN network types with a preference toward Geneve. Projects can choose to isolate self-service networks, connect two or more together via routers, or connect them to provider networks via routers with appropriate capabilities. Similar to provider networks, self-service networks can use arbitrary names.
Note
Similar to provider networks, self-service VLAN networks map to a unique bridge on each compute node that supports launching instances on those networks. Self-service VLAN networks also require several commands at the host and OVS levels. The following example assumes use of Geneve self-service networks.
Create a self-service network¶
Creating a self-service network involves several commands at the Networking service level that yield a series of operations at the OVN level to create the virtual network components. The following example creates a Geneve self-service network and binds a subnet to it. The subnet uses DHCP to distribute IP addresses to instances.
On the controller node, source the credentials for a regular (non-privileged) project. The following example uses the
demoproject.On the controller node, create a self-service network in the Networking service.
$ openstack network create selfservice +-------------------------+--------------------------------------+ | Field | Value | +-------------------------+--------------------------------------+ | admin_state_up | UP | | availability_zone_hints | | | availability_zones | | | created_at | 2016-06-09T15:42:41 | | description | | | id | f49791f7-e653-4b43-99b1-0f5557c313e4 | | ipv4_address_scope | None | | ipv6_address_scope | None | | mtu | 1442 | | name | selfservice | | port_security_enabled | True | | project_id | 1ef26f483b9d44e8ac0c97388d6cb609 | | router_external | Internal | | shared | False | | status | ACTIVE | | subnets | | | tags | [] | | updated_at | 2016-06-09T15:42:41 | +-------------------------+--------------------------------------+
OVN operations¶
The OVN mechanism driver and OVN perform the following operations during creation of a self-service network.
The mechanism driver translates the network into a logical switch in the OVN northbound database.
uuid : 0ab40684-7cf8-4d6c-ae8b-9d9143762d37 acls : [] external_ids : {"neutron:network_name"="selfservice"} name : "neutron-d5aadceb-d8d6-41c8-9252-c5e0fe6c26a5" ports : []
The OVN northbound service translates this object into new datapath bindings and logical flows in the OVN southbound database.
Datapath bindings
_uuid : 0b214af6-8910-489c-926a-fd0ed16a8251 external_ids : {logical-switch="15e2c80b-1461-4003-9869-80416cd97de5"} tunnel_key : 5
Logical flows
Datapath: 0b214af6-8910-489c-926a-fd0ed16a8251 Pipeline: ingress table= 0( ls_in_port_sec_l2), priority= 100, match=(eth.src[40]), action=(drop;) table= 0( ls_in_port_sec_l2), priority= 100, match=(vlan.present), action=(drop;) table= 1( ls_in_port_sec_ip), priority= 0, match=(1), action=(next;) table= 2( ls_in_port_sec_nd), priority= 0, match=(1), action=(next;) table= 3( ls_in_pre_acl), priority= 0, match=(1), action=(next;) table= 4( ls_in_pre_lb), priority= 0, match=(1), action=(next;) table= 5( ls_in_pre_stateful), priority= 100, match=(reg0[0] == 1), action=(ct_next;) table= 5( ls_in_pre_stateful), priority= 0, match=(1), action=(next;) table= 6( ls_in_acl), priority= 0, match=(1), action=(next;) table= 7( ls_in_lb), priority= 0, match=(1), action=(next;) table= 8( ls_in_stateful), priority= 100, match=(reg0[2] == 1), action=(ct_lb;) table= 8( ls_in_stateful), priority= 100, match=(reg0[1] == 1), action=(ct_commit; next;) table= 8( ls_in_stateful), priority= 0, match=(1), action=(next;) table= 9( ls_in_arp_rsp), priority= 0, match=(1), action=(next;) table=10( ls_in_l2_lkup), priority= 100, match=(eth.mcast), action=(outport = "_MC_flood"; output;) Datapath: 0b214af6-8910-489c-926a-fd0ed16a8251 Pipeline: egress table= 0( ls_out_pre_lb), priority= 0, match=(1), action=(next;) table= 1( ls_out_pre_acl), priority= 0, match=(1), action=(next;) table= 2(ls_out_pre_stateful), priority= 100, match=(reg0[0] == 1), action=(ct_next;) table= 2(ls_out_pre_stateful), priority= 0, match=(1), action=(next;) table= 3( ls_out_lb), priority= 0, match=(1), action=(next;) table= 4( ls_out_acl), priority= 0, match=(1), action=(next;) table= 5( ls_out_stateful), priority= 100, match=(reg0[1] == 1), action=(ct_commit; next;) table= 5( ls_out_stateful), priority= 100, match=(reg0[2] == 1), action=(ct_lb;) table= 5( ls_out_stateful), priority= 0, match=(1), action=(next;) table= 6( ls_out_port_sec_ip), priority= 0, match=(1), action=(next;) table= 7( ls_out_port_sec_l2), priority= 100, match=(eth.mcast), action=(output;)
Note
These actions do not create flows on any nodes.
Create a subnet on the self-service network¶
A self-service network requires at least one subnet. In most cases, the environment provides suitable values for IP address allocation for instances, default gateway IP address, and metadata such as name resolution.
On the controller node, create a subnet bound to the self-service network
selfservice.$ openstack subnet create --network selfservice --subnet-range 192.168.1.0/24 selfservice-v4 +-------------------+--------------------------------------+ | Field | Value | +-------------------+--------------------------------------+ | allocation_pools | 192.168.1.2-192.168.1.254 | | cidr | 192.168.1.0/24 | | created_at | 2016-06-16 00:19:08+00:00 | | description | | | dns_nameservers | | | enable_dhcp | True | | gateway_ip | 192.168.1.1 | | headers | | | host_routes | | | id | 8f027f25-0112-45b9-a1b9-2f8097c57219 | | ip_version | 4 | | ipv6_address_mode | None | | ipv6_ra_mode | None | | name | selfservice-v4 | | network_id | 8ed4e43b-63ef-41ed-808b-b59f1120aec0 | | project_id | b1ebf33664df402693f729090cfab861 | | subnetpool_id | None | | updated_at | 2016-06-16 00:19:08+00:00 | +-------------------+--------------------------------------+
If using DHCP to manage instance IP addresses, adding a subnet causes a series of operations in the Networking service and OVN.
- The Networking service schedules the network on appropriate number of DHCP agents. The example environment contains three DHCP agents.
- Each DHCP agent spawns a network namespace with a
dnsmasqprocess using an IP address from the subnet allocation. - The OVN mechanism driver creates a logical switch port object in the OVN
northbound database for each
dnsmasqprocess.
OVN operations¶
The OVN mechanism driver and OVN perform the following operations during creation of a subnet on a self-service network.
If the subnet uses DHCP for IP address management, create logical ports ports for each DHCP agent serving the subnet and bind them to the logical switch. In this example, the subnet contains two DHCP agents.
_uuid : 1ed7c28b-dc69-42b8-bed6-46477bb8b539 addresses : ["fa:16:3e:94:db:5e 192.168.1.2"] enabled : true external_ids : {"neutron:port_name"=""} name : "0cfbbdca-ff58-4cf8-a7d3-77daaebe3056" options : {} parent_name : [] port_security : [] tag : [] type : "" up : true _uuid : ae10a5e0-db25-4108-b06a-d2d5c127d9c4 addresses : ["fa:16:3e:90:bd:f1 192.168.1.3"] enabled : true external_ids : {"neutron:port_name"=""} name : "74930ace-d939-4bca-b577-fccba24c3fca" options : {} parent_name : [] port_security : [] tag : [] type : "" up : true _uuid : 0ab40684-7cf8-4d6c-ae8b-9d9143762d37 acls : [] external_ids : {"neutron:network_name"="selfservice"} name : "neutron-d5aadceb-d8d6-41c8-9252-c5e0fe6c26a5" ports : [1ed7c28b-dc69-42b8-bed6-46477bb8b539, ae10a5e0-db25-4108-b06a-d2d5c127d9c4]
The OVN northbound service creates port bindings for these logical ports and adds them to the appropriate multicast group.
Port bindings
_uuid : 3e463ca0-951c-46fd-b6cf-05392fa3aa1f chassis : 6a9d0619-8818-41e6-abef-2f3d9a597c03 datapath : 0b214af6-8910-489c-926a-fd0ed16a8251 logical_port : "a203b410-97c1-4e4a-b0c3-558a10841c16" mac : ["fa:16:3e:a1:dc:58 192.168.1.3"] options : {} parent_port : [] tag : [] tunnel_key : 2 type : "" _uuid : fa7b294d-2a62-45ae-8de3-a41c002de6de chassis : d63e8ae8-caf3-4a6b-9840-5c3a57febcac datapath : 0b214af6-8910-489c-926a-fd0ed16a8251 logical_port : "39b23721-46f4-4747-af54-7e12f22b3397" mac : ["fa:16:3e:1a:b4:23 192.168.1.2"] options : {} parent_port : [] tag : [] tunnel_key : 1 type : ""
Multicast groups
_uuid : c08d0102-c414-4a47-98d9-dd3fa9f9901c datapath : 0b214af6-8910-489c-926a-fd0ed16a8251 name : _MC_flood ports : [3e463ca0-951c-46fd-b6cf-05392fa3aa1f, fa7b294d-2a62-45ae-8de3-a41c002de6de] tunnel_key : 65535
The OVN northbound service translates the logical ports into logical flows in the OVN southbound database.
Datapath: 0b214af6-8910-489c-926a-fd0ed16a8251 Pipeline: ingress table= 0( ls_in_port_sec_l2), priority= 50, match=(inport == "39b23721-46f4-4747-af54-7e12f22b3397"), action=(next;) table= 0( ls_in_port_sec_l2), priority= 50, match=(inport == "a203b410-97c1-4e4a-b0c3-558a10841c16"), action=(next;) table= 9( ls_in_arp_rsp), priority= 50, match=(arp.tpa == 192.168.1.2 && arp.op == 1), action=(eth.dst = eth.src; eth.src = fa:16:3e:1a:b4:23; arp.op = 2; /* ARP reply */ arp.tha = arp.sha; arp.sha = fa:16:3e:1a:b4:23; arp.tpa = arp.spa; arp.spa = 192.168.1.2; outport = inport; inport = ""; /* Allow sending out inport. */ output;) table= 9( ls_in_arp_rsp), priority= 50, match=(arp.tpa == 192.168.1.3 && arp.op == 1), action=(eth.dst = eth.src; eth.src = fa:16:3e:a1:dc:58; arp.op = 2; /* ARP reply */ arp.tha = arp.sha; arp.sha = fa:16:3e:a1:dc:58; arp.tpa = arp.spa; arp.spa = 192.168.1.3; outport = inport; inport = ""; /* Allow sending out inport. */ output;) table=10( ls_in_l2_lkup), priority= 50, match=(eth.dst == fa:16:3e:a1:dc:58), action=(outport = "a203b410-97c1-4e4a-b0c3-558a10841c16"; output;) table=10( ls_in_l2_lkup), priority= 50, match=(eth.dst == fa:16:3e:1a:b4:23), action=(outport = "39b23721-46f4-4747-af54-7e12f22b3397"; output;) Datapath: 0b214af6-8910-489c-926a-fd0ed16a8251 Pipeline: egress table= 7( ls_out_port_sec_l2), priority= 50, match=(outport == "39b23721-46f4-4747-af54-7e12f22b3397"), action=(output;) table= 7( ls_out_port_sec_l2), priority= 50, match=(outport == "a203b410-97c1-4e4a-b0c3-558a10841c16"), action=(output;)
For each compute node without a DHCP agent on the subnet:
The OVN controller service translates these objects into flows on the integration bridge
br-int.# ovs-ofctl dump-flows br-int cookie=0x0, duration=9.054s, table=32, n_packets=0, n_bytes=0, idle_age=9, priority=100,reg7=0xffff,metadata=0x5 actions=load:0x5->NXM_NX_TUN_ID[0..23], set_field:0xffff/0xffffffff->tun_metadata0, move:NXM_NX_REG6[0..14]->NXM_NX_TUN_METADATA0[16..30], output:4,output:3
For each compute node with a DHCP agent on the subnet:
Creation of a DHCP network namespace adds a virtual switch ports that connects the DHCP agent with the
dnsmasqprocess to the integration bridge.# ovs-ofctl show br-int OFPT_FEATURES_REPLY (xid=0x2): dpid:000022024a1dc045 n_tables:254, n_buffers:256 capabilities: FLOW_STATS TABLE_STATS PORT_STATS QUEUE_STATS ARP_MATCH_IP actions: output enqueue set_vlan_vid set_vlan_pcp strip_vlan mod_dl_src mod_dl_dst mod_nw_src mod_nw_dst mod_nw_tos mod_tp_src mod_tp_dst 9(tap39b23721-46): addr:00:00:00:00:b0:5d config: PORT_DOWN state: LINK_DOWN speed: 0 Mbps now, 0 Mbps max
The OVN controller service translates these objects into flows on the integration bridge.
cookie=0x0, duration=21.074s, table=0, n_packets=8, n_bytes=648, idle_age=11, priority=100,in_port=9 actions=load:0x2->NXM_NX_REG5[],load:0x5->OXM_OF_METADATA[], load:0x1->NXM_NX_REG6[],resubmit(,16) cookie=0x0, duration=21.076s, table=16, n_packets=0, n_bytes=0, idle_age=21, priority=100,metadata=0x5, dl_src=01:00:00:00:00:00/01:00:00:00:00:00 actions=drop cookie=0x0, duration=21.075s, table=16, n_packets=0, n_bytes=0, idle_age=21, priority=100,metadata=0x5,vlan_tci=0x1000/0x1000 actions=drop cookie=0x0, duration=21.076s, table=16, n_packets=0, n_bytes=0, idle_age=21, priority=50,reg6=0x2,metadata=0x5 actions=resubmit(,17) cookie=0x0, duration=21.075s, table=16, n_packets=8, n_bytes=648, idle_age=11, priority=50,reg6=0x1,metadata=0x5 actions=resubmit(,17) cookie=0x0, duration=21.075s, table=17, n_packets=8, n_bytes=648, idle_age=11, priority=0,metadata=0x5 actions=resubmit(,18) cookie=0x0, duration=21.076s, table=18, n_packets=8, n_bytes=648, idle_age=11, priority=0,metadata=0x5 actions=resubmit(,19) cookie=0x0, duration=21.076s, table=19, n_packets=8, n_bytes=648, idle_age=11, priority=0,metadata=0x5 actions=resubmit(,20) cookie=0x0, duration=21.075s, table=20, n_packets=8, n_bytes=648, idle_age=11, priority=0,metadata=0x5 actions=resubmit(,21) cookie=0x0, duration=5.398s, table=21, n_packets=0, n_bytes=0, idle_age=5, priority=100,ipv6,reg0=0x1/0x1,metadata=0x5 actions=ct(table=22,zone=NXM_NX_REG5[0..15]) cookie=0x0, duration=5.398s, table=21, n_packets=0, n_bytes=0, idle_age=5, priority=100,ip,reg0=0x1/0x1,metadata=0x5 actions=ct(table=22,zone=NXM_NX_REG5[0..15]) cookie=0x0, duration=5.398s, table=22, n_packets=6, n_bytes=508, idle_age=2, priority=0,metadata=0x5 actions=resubmit(,23) cookie=0x0, duration=5.398s, table=23, n_packets=6, n_bytes=508, idle_age=2, priority=0,metadata=0x5 actions=resubmit(,24) cookie=0x0, duration=5.398s, table=24, n_packets=0, n_bytes=0, idle_age=5, priority=100,ipv6,reg0=0x4/0x4,metadata=0x5 actions=ct(table=25,zone=NXM_NX_REG5[0..15],nat) cookie=0x0, duration=5.398s, table=24, n_packets=0, n_bytes=0, idle_age=5, priority=100,ip,reg0=0x4/0x4,metadata=0x5 actions=ct(table=25,zone=NXM_NX_REG5[0..15],nat) cookie=0x0, duration=5.398s, table=24, n_packets=0, n_bytes=0, idle_age=5, priority=100,ipv6,reg0=0x2/0x2,metadata=0x5 actions=ct(commit,zone=NXM_NX_REG5[0..15]),resubmit(,25) cookie=0x0, duration=5.398s, table=24, n_packets=0, n_bytes=0, idle_age=5, priority=100,ip,reg0=0x2/0x2,metadata=0x5 actions=ct(commit,zone=NXM_NX_REG5[0..15]),resubmit(,25) cookie=0x0, duration=5.399s, table=24, n_packets=6, n_bytes=508, idle_age=2, priority=0,metadata=0x5 actions=resubmit(,25) cookie=0x0, duration=5.398s, table=25, n_packets=0, n_bytes=0, idle_age=5, priority=50,arp,metadata=0x5, arp_tpa=192.168.1.2,arp_op=1 actions=move:NXM_OF_ETH_SRC[]->NXM_OF_ETH_DST[], mod_dl_src:fa:16:3e:82:8b:0e,load:0x2->NXM_OF_ARP_OP[], move:NXM_NX_ARP_SHA[]->NXM_NX_ARP_THA[], load:0xfa163e828b0e->NXM_NX_ARP_SHA[], move:NXM_OF_ARP_SPA[]->NXM_OF_ARP_TPA[], load:0xc0a80102->NXM_OF_ARP_SPA[], move:NXM_NX_REG6[]->NXM_NX_REG7[],load:0->NXM_NX_REG6[], load:0->NXM_OF_IN_PORT[],resubmit(,32) cookie=0x0, duration=5.378s, table=25, n_packets=0, n_bytes=0, idle_age=5, priority=50,arp,metadata=0x5,arp_tpa=192.168.1.3, arp_op=1 actions=move:NXM_OF_ETH_SRC[]->NXM_OF_ETH_DST[], mod_dl_src:fa:16:3e:d5:00:02,load:0x2->NXM_OF_ARP_OP[], move:NXM_NX_ARP_SHA[]->NXM_NX_ARP_THA[], load:0xfa163ed50002->NXM_NX_ARP_SHA[], move:NXM_OF_ARP_SPA[]->NXM_OF_ARP_TPA[], load:0xc0a80103->NXM_OF_ARP_SPA[], move:NXM_NX_REG6[]->NXM_NX_REG7[],load:0->NXM_NX_REG6[], load:0->NXM_OF_IN_PORT[],resubmit(,32) cookie=0x0, duration=5.399s, table=25, n_packets=6, n_bytes=508, idle_age=2, priority=0,metadata=0x5 actions=resubmit(,26) cookie=0x0, duration=5.399s, table=26, n_packets=6, n_bytes=508, idle_age=2, priority=100,metadata=0x5, dl_dst=01:00:00:00:00:00/01:00:00:00:00:00 actions=load:0xffff->NXM_NX_REG7[],resubmit(,32) cookie=0x0, duration=5.398s, table=26, n_packets=0, n_bytes=0, idle_age=5, priority=50,metadata=0x5,dl_dst=fa:16:3e:d5:00:02 actions=load:0x2->NXM_NX_REG7[],resubmit(,32) cookie=0x0, duration=5.398s, table=26, n_packets=0, n_bytes=0, idle_age=5, priority=50,metadata=0x5,dl_dst=fa:16:3e:82:8b:0e actions=load:0x1->NXM_NX_REG7[],resubmit(,32) cookie=0x0, duration=21.038s, table=32, n_packets=0, n_bytes=0, idle_age=21, priority=100,reg7=0x2,metadata=0x5 actions=load:0x5->NXM_NX_TUN_ID[0..23], set_field:0x2/0xffffffff->tun_metadata0, move:NXM_NX_REG6[0..14]->NXM_NX_TUN_METADATA0[16..30],output:4 cookie=0x0, duration=21.038s, table=32, n_packets=8, n_bytes=648, idle_age=11, priority=100,reg7=0xffff,metadata=0x5 actions=load:0x5->NXM_NX_TUN_ID[0..23], set_field:0xffff/0xffffffff->tun_metadata0, move:NXM_NX_REG6[0..14]->NXM_NX_TUN_METADATA0[16..30], output:4,resubmit(,33) cookie=0x0, duration=5.397s, table=33, n_packets=12, n_bytes=1016, idle_age=2, priority=100,reg7=0xffff,metadata=0x5 actions=load:0x1->NXM_NX_REG7[],resubmit(,34), load:0xffff->NXM_NX_REG7[] cookie=0x0, duration=5.397s, table=33, n_packets=0, n_bytes=0, idle_age=5, priority=100,reg7=0x1,metadata=0x5 actions=resubmit(,34) cookie=0x0, duration=21.074s, table=34, n_packets=8, n_bytes=648, idle_age=11, priority=100,reg6=0x1,reg7=0x1,metadata=0x5 actions=drop cookie=0x0, duration=21.076s, table=48, n_packets=8, n_bytes=648, idle_age=11, priority=0,metadata=0x5 actions=resubmit(,49) cookie=0x0, duration=21.075s, table=49, n_packets=8, n_bytes=648, idle_age=11, priority=0,metadata=0x5 actions=resubmit(,50) cookie=0x0, duration=5.398s, table=50, n_packets=0, n_bytes=0, idle_age=5, priority=100,ipv6,reg0=0x1/0x1,metadata=0x5 actions=ct(table=51,zone=NXM_NX_REG5[0..15]) cookie=0x0, duration=5.398s, table=50, n_packets=0, n_bytes=0, idle_age=5, priority=100,ip,reg0=0x1/0x1,metadata=0x5 actions=ct(table=51,zone=NXM_NX_REG5[0..15]) cookie=0x0, duration=5.398s, table=50, n_packets=6, n_bytes=508, idle_age=3, priority=0,metadata=0x5 actions=resubmit(,51) cookie=0x0, duration=5.398s, table=51, n_packets=6, n_bytes=508, idle_age=3, priority=0,metadata=0x5 actions=resubmit(,52) cookie=0x0, duration=5.398s, table=52, n_packets=6, n_bytes=508, idle_age=3, priority=0,metadata=0x5 actions=resubmit(,53) cookie=0x0, duration=5.399s, table=53, n_packets=0, n_bytes=0, idle_age=5, priority=100,ipv6,reg0=0x4/0x4,metadata=0x5 actions=ct(table=54,zone=NXM_NX_REG5[0..15],nat) cookie=0x0, duration=5.398s, table=53, n_packets=0, n_bytes=0, idle_age=5, priority=100,ip,reg0=0x4/0x4,metadata=0x5 actions=ct(table=54,zone=NXM_NX_REG5[0..15],nat) cookie=0x0, duration=5.398s, table=53, n_packets=0, n_bytes=0, idle_age=5, priority=100,ip,reg0=0x2/0x2,metadata=0x5 actions=ct(commit,zone=NXM_NX_REG5[0..15]),resubmit(,54) cookie=0x0, duration=5.398s, table=53, n_packets=0, n_bytes=0, idle_age=5, priority=100,ipv6,reg0=0x2/0x2,metadata=0x5 actions=ct(commit,zone=NXM_NX_REG5[0..15]),resubmit(,54) cookie=0x0, duration=5.398s, table=53, n_packets=6, n_bytes=508, idle_age=3, priority=0,metadata=0x5 actions=resubmit(,54) cookie=0x0, duration=5.398s, table=54, n_packets=6, n_bytes=508, idle_age=3, priority=0,metadata=0x5 actions=resubmit(,55) cookie=0x0, duration=5.398s, table=55, n_packets=6, n_bytes=508, idle_age=3, priority=100,metadata=0x5, dl_dst=01:00:00:00:00:00/01:00:00:00:00:00 actions=resubmit(,64) cookie=0x0, duration=5.398s, table=55, n_packets=0, n_bytes=0, idle_age=5, priority=50,reg7=0x1,metadata=0x5 actions=resubmit(,64) cookie=0x0, duration=5.398s, table=55, n_packets=0, n_bytes=0, idle_age=5, priority=50,reg7=0x2,metadata=0x5 actions=resubmit(,64) cookie=0x0, duration=5.397s, table=64, n_packets=6, n_bytes=508, idle_age=3, priority=100,reg7=0x1,metadata=0x5 actions=output:9