OVS组件
OVS包含三个重要的组件：ovsdb-server、ovs-vswitchd、以及OVS内核模块。
- ovsdb-server：OVS的数据库服务进程，持久化存储的数据库，用于记录的网桥、端口、QOS等网络配置信息，为控制器和ovs-vswitchd提供OVSDB操作接口。
- ovs-vswitchd：OVS的核心组件，负责保存和管理控制器下发的所有流表，为OVS的内核模块提供流表查询功能，并为控制器提供OpenFlow协议的操作接口。
- OVS内核模块：缓存某些常用流表，并负责数据包转发，当遇到无法匹配的报文，该模块将向ovs-vswitchd发送pack-in请求，获取报文处理指令。
#ps -ef | grep ovs-vswitchd
root 987 1 0 Jan24 ? 02:43:11 ovs-vswitchd unix:/var/run/openvswitch/db.sock -vconsole:emer -vsyslog:err -vfile:info --mlockall --no-chdir --log-file=/var/log/openvswitch/ovs-vswitchd.log --pidfile=/var/run/openvswitch/ovs-vswitchd.pid --detach
ovs-vswitchd监听了一个本机的db.sock文件，这个socket就是openvswitch的ovsdb的链接，ovs-vswitchd可以通过这个socket把配置信息写到ovsdb
默认数据库：Open_vSwitch
默认db路径：/etc/openvswitch/conf.db
默认schema：/usr/share/openvswitch/vswitch.ovsschema
默认socket：/var/run/openvswitch/db.sock
ovs-vsctl add-br br-int
ovs-vsctl add-port ovs-veth10
1、Insert：插入，无任何关联项
ovsdb-client transact '["Open_vSwitch",{"op":"insert","table":"xxx","row":{"name":"xxx","value":"xxx"}}]'
2、Selsect：根据where条件筛选
ovsdb-client transact '["Open_vSwitch",{"op":"select","table":"xxx","where":[["name","==","xxx"]]}]'
3、Update：更新表项
ovsdb-client transact '["Open_vSwitch",{"op":"update","table":"xxx","where":[["name","==","xxx"]],"row":{'name':"xxx"}}]'
4、Delete：删除表项
ovsdb-client transact '["Open_vSwitch",{"op":"delete","table":"xxx","where":[["name","==","xxx"]]}]'
5、Mutate:联合操作在table1里insert数据，where里找到关联table2的元素，uuid-name和set保持一致即可，mutations里的第一个参数是table2的column在table1里作为uuid
ovsdb-client transact '["Open_vSwitch",{"op":"insert","table":"xxx1","row":{'name':"xxx"},"uuid-name":"abc"},{"op":"mutate","table":"xxx2","where":[["name","==","xxx"]],"mutations":[["name","insert",["set",[["named-uuid","abc"]]]]]}]'
查看ovsdb里对ovs的操作，可以看到Open_vSwitch表里增加一条记录，Bridge表增加一条记录，Port表增加两条记录
ovsdb-tool show-log -m
record 0: "Open_vSwitch" schema, version="8.2.0", cksum="xxx"
record 1: 2022-07-11 06:42:10.679 "compacting database online"
table Interface insert row "ovs-veth10" (92dee19b):
table Port insert row "br-int" (ccfd1042):
table Port insert row "ovs-veth10" (751976fd):
table Bridge insert row "br-int" (64043d26):
table Open_vSwitch insert row 097bf88c:
列出ovsdb里的所有数据库，默认是Open_vSwitch
ovsdb-client list-dbs
Open_vSwitch
列出ovsdb里的所有table
ovsdb-client list-tables Open_vSwitch
Table
Controller
Bridge
Queue
IPFIX
NetFlow
Open_vSwitch
CT_Zone
QoS
Datapath
SSL
Port
sFlow
Flow_Sample_Collector_Set
CT_Timeout_Policy
Mirror
Flow_Table
Interface
AutoAttach
Manager
查看Open_vSwitch表新增内容，bridges会不断更新网桥id，同时会记录cur_cfg和next_cfg
ovsdb-client dump Open_vSwitch Open_vSwitch
Open_vSwitch table
_uuid bridges cur_cfg datapath_types datapaths db_version dpdk_initialized dpdk_version external_ids iface_types manager_options next_cfg other_config ovs_version ssl statistics system_type system_version
--------------------------------------------------------------------------------
097bf88c-b5c3-4e62-b795-51ea0f0c0053 [64043d26-8311-4a68-837a-f58b6bd3293c] 183 [netdev, system] {} "8.2.0" false none {hostname=ubuntu, rundir="/var/run/openvswitch", system-id="e73b1ede-9e48-4412-9665-c0f998fec762"} [erspan, geneve, gre, internal, ip6erspan, ip6gre, lisp, patch, stt, system, tap, vxlan] [] 183 {} "2.13.3" [] {} ubuntu "20.04"
查看数据库Open_vSwitch中Bridge表内容，看到一个br-int网桥
ovsdb-client dump Open_vSwitch Bridge
Bridge table
_uuid auto_attach controller datapath_id datapath_type datapath_version external_ids fail_mode flood_vlans flow_tables ipfix mcast_snooping_enable mirrors name netflow other_config ports protocols rstp_enable rstp_status sflow status stp_enable
--------------------------------------------------------------------------------
64043d26-8311-4a68-837a-f58b6bd3293c [] [] "0000263d0464684a" "" "<unknown>" {} [] [] {} [] false [] br-int [] {} [28e2a8cf-5bad-43c1-a6e9-b6bb635295bb, 751976fd-0cec-42bc-ada2-cf7bee05453d, 9f4d9f67-5b0e-4cbd-ba8b-9386dcbf3c65, c0e09899-3197-4763-9bf0-a1de941f0d32, ccfd1042-55f4-4af6-9bc7-49ddb29c09de] [] false {} [] {} false
查看数据库Open_vSwitch中Port表内容，看到一个网桥同名接口br-int和自建接口ovs-veth10，每个port都关联一个interface
ovsdb-client dump Open_vSwitch Port
Port table
_uuid bond_active_slave bond_downdelay bond_fake_iface bond_mode bond_updelay cvlans external_ids fake_bridge interfaces lacp mac name other_config protected qos rstp_statistics rstp_status statistics status tag trunks vlan_mode
--------------------------------------------------------------------------------
ccfd1042-55f4-4af6-9bc7-49ddb29c09de [] 0 false [] 0 [] {} false [58c5bd1a-6165-46d5-bd74-b5879874ed28] [] [] br-int {} false [] {} {} {} {} [] [] []
751976fd-0cec-42bc-ada2-cf7bee05453d [] 0 false [] 0 [] {} false [92dee19b-7042-4ec4-81eb-2b8f10095c5c] [] [] ovs-veth10 {} false [] {} {} {} {} [] [] []
监控数据库Open_vSwitch中Port表变动
ovsdb-client monitor Open_vSwitch Port
查看数据库Open_vSwitch中Interface表内容，看到port关联的interface里对应的ofport就是网桥的编号
ovsdb-client dump Open_vSwitch Interface
Interface table
_uuid admin_state bfd bfd_status cfm_fault cfm_fault_status cfm_flap_count cfm_health cfm_mpid cfm_remote_mpids cfm_remote_opstate duplex error external_ids ifindex ingress_policing_burst ingress_policing_rate lacp_current link_resets link_speed link_state lldp mac mac_in_use mtu mtu_request name ofport ofport_request options other_config statistics status type
--------------------------------------------------------------------------------
58c5bd1a-6165-46d5-bd74-b5879874ed28 down {} {} [] [] [] [] [] [] [] [] [] {} 137 0 0 [] 0 [] down {} [] "26:3d:04:64:68:4a" 1500 [] br-int 65534 [] {} {} {collisions=0, rx_bytes=0, rx_crc_err=0, rx_dropped=66459, rx_errors=0, rx_frame_err=0, rx_missed_errors=0, rx_over_err=0, rx_packets=0, tx_bytes=0, tx_dropped=0, tx_errors=0, tx_packets=0} {driver_name=openvswitch} internal
92dee19b-7042-4ec4-81eb-2b8f10095c5c up {} {} [] [] [] [] [] [] [] full [] {} 138 0 0 [] 1 10000000000 up {} [] "f2:85:c5:5c:e2:8e" 1500 [] ovs-veth10 2 [] {} {} {collisions=0, rx_bytes=57076, rx_crc_err=0, rx_dropped=0, rx_errors=0, rx_frame_err=0, rx_missed_errors=0, rx_over_err=0, rx_packets=722, tx_bytes=22453284, tx_dropped=0, tx_errors=0, tx_packets=66450} {driver_name=veth, driver_version="1.0", firmware_version=""} ""
自建数据库
1、创建schema文件amber.schema
{
"name": "Amber",
"version": "1.0.1",
"cksum": "xxx",
"tables": {
"Information": {
"columns":{
"name": {
"type": {
"key": "string",
"max": 1,
"min": 0
}
},
"age": {
"type": {
"key": "integer",
"max": 1,
"min": 0
}
},
"number": {
"type": {"key": {"type": "string", "minLength": 17, "maxLength": 17}}}
},
"isRoot": true,
"maxRows": 1
},
"Score": {
"columns": {
"math":{
"type": {
"key": {
"type": "integer",
"max": 1,
"min": 1
}
},
"mutable": false
},
"chinese": {
"type": {
"key": {
"type": "integer",
"max": 1,
"min": 1
}
},
"mutable": false
},
"english": {
"type": "integer"
"max": 1,
"min": 1
},
"isRoot": true
},}
注意，名称值可选性说明“columns”{: , …}必选包含的表格的UUID、版本信息等“maxRows”可选表格的最大行数“isRoot”可选表格内是否存在强依赖关系“indexes”[*]可选用于标识表格列”type”必选列的类型“ephemeral”< boolean >可选数据是否持久化“mutable”可选数据是否可修改
2、创建ovsdb数据库：ovsdb-tool create amber.db amber.schema
3、启动ovsdb数据库：ovsdb-server -vconsole:off -vfile:info --log-file=/root/amberd.log --remote=punix:/var/run/amber/amberd.sock --pidfile=/var/run/amberd.pid --unixctl=/var/run/amberd.ctl --detach --monitor /root/sdn/platform/src/ctrlplane/ovsdb/amber.db
4、查看数据库Table时要指定socket
ovsdb-client list-tables unix:/var/run/amber/amberd.sock DP_Option
ovsdb-client dump unix:/var/run/amber/amberd.sock DP_Option DP_Option
ovsdb-client transact unix:/var/run/amber/amberd.sock '["DP_Option",{"op":"select","table":"DP_Option","where":[]}]'
