红帽全球峰会2.3. 列出 OVN-Kubernetes 北向数据库内容
每个节点都由该节点上 ovnkube-node pod 中运行的 ovnkube-controller 容器控制。若要了解 OVN 逻辑网络实体，您需要检查作为容器在该节点上的 ovnkube-node pod 中运行的北向数据库，以查看您要查看的节点中的对象。
先决条件
-
使用具有
cluster-admin角色的用户访问集群。 -
已安装 OpenShift CLI（
oc）。
流程
要在集群中运行 ovn nbctl 或 sbctl 命令，您必须在相关节点上的 nbdb 或 sbdb 容器中打开远程 shell
运行以下命令列出 pod：
$ oc get po -n openshift-ovn-kubernetes输出示例
NAME READY STATUS RESTARTS AGE ovnkube-control-plane-8444dff7f9-4lh9k 2/2 Running 0 27m ovnkube-control-plane-8444dff7f9-5rjh9 2/2 Running 0 27m ovnkube-node-55xs2 8/8 Running 0 26m ovnkube-node-7r84r 8/8 Running 0 16m ovnkube-node-bqq8p 8/8 Running 0 17m ovnkube-node-mkj4f 8/8 Running 0 26m ovnkube-node-mlr8k 8/8 Running 0 26m ovnkube-node-wqn2m 8/8 Running 0 16m可选： 要使用节点信息列出 pod，请运行以下命令：
$ oc get pods -n openshift-ovn-kubernetes -owide输出示例
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES ovnkube-control-plane-8444dff7f9-4lh9k 2/2 Running 0 27m 10.0.0.3 ci-ln-t487nnb-72292-mdcnq-master-1 <none> <none> ovnkube-control-plane-8444dff7f9-5rjh9 2/2 Running 0 27m 10.0.0.4 ci-ln-t487nnb-72292-mdcnq-master-2 <none> <none> ovnkube-node-55xs2 8/8 Running 0 26m 10.0.0.4 ci-ln-t487nnb-72292-mdcnq-master-2 <none> <none> ovnkube-node-7r84r 8/8 Running 0 17m 10.0.128.3 ci-ln-t487nnb-72292-mdcnq-worker-b-wbz7z <none> <none> ovnkube-node-bqq8p 8/8 Running 0 17m 10.0.128.2 ci-ln-t487nnb-72292-mdcnq-worker-a-lh7ms <none> <none> ovnkube-node-mkj4f 8/8 Running 0 27m 10.0.0.5 ci-ln-t487nnb-72292-mdcnq-master-0 <none> <none> ovnkube-node-mlr8k 8/8 Running 0 27m 10.0.0.3 ci-ln-t487nnb-72292-mdcnq-master-1 <none> <none> ovnkube-node-wqn2m 8/8 Running 0 17m 10.0.128.4 ci-ln-t487nnb-72292-mdcnq-worker-c-przlm <none> <none>运行以下命令，进入 pod 以查看北向数据库：
$ oc rsh -c nbdb -n openshift-ovn-kubernetes ovnkube-node-55xs2运行以下命令以显示北向数据库中的所有对象：
$ ovn-nbctl show此处列出输出太长。列表中包含 NAT 规则、逻辑交换机、负载均衡器等。
您可以使用以下可选命令缩小并专注于特定组件：
运行以下命令以显示逻辑路由器列表：
$ oc exec -n openshift-ovn-kubernetes -it ovnkube-node-55xs2 \ -c northd -- ovn-nbctl lr-list输出示例
45339f4f-7d0b-41d0-b5f9-9fca9ce40ce6 (GR_ci-ln-t487nnb-72292-mdcnq-master-2) 96a0a0f0-e7ed-4fec-8393-3195563de1b8 (ovn_cluster_router)注意在这个输出中，您可以看到每个节点中存在路由器，再加上
ovn_cluster_router。运行以下命令以显示逻辑交换机列表：
$ oc exec -n openshift-ovn-kubernetes -it ovnkube-node-55xs2 \ -c nbdb -- ovn-nbctl ls-list输出示例
bdd7dc3d-d848-4a74-b293-cc15128ea614 (ci-ln-t487nnb-72292-mdcnq-master-2) b349292d-ee03-4914-935f-1940b6cb91e5 (ext_ci-ln-t487nnb-72292-mdcnq-master-2) 0aac0754-ea32-4e33-b086-35eeabf0a140 (join) 992509d7-2c3f-4432-88db-c179e43592e5 (transit_switch)注意在这个输出中，您可以看到每个节点的 ext 交换机以及节点名称本身和 join 开关。
运行以下命令以显示负载均衡器列表：
$ oc exec -n openshift-ovn-kubernetes -it ovnkube-node-55xs2 \ -c nbdb -- ovn-nbctl lb-list输出示例
UUID LB PROTO VIP IPs 7c84c673-ed2a-4436-9a1f-9bc5dd181eea Service_default/ tcp 172.30.0.1:443 10.0.0.3:6443,169.254.169.2:6443,10.0.0.5:6443 4d663fd9-ddc8-4271-b333-4c0e279e20bb Service_default/ tcp 172.30.0.1:443 10.0.0.3:6443,10.0.0.4:6443,10.0.0.5:6443 292eb07f-b82f-4962-868a-4f541d250bca Service_openshif tcp 172.30.105.247:443 10.129.0.12:8443 034b5a7f-bb6a-45e9-8e6d-573a82dc5ee3 Service_openshif tcp 172.30.192.38:443 10.0.0.3:10259,10.0.0.4:10259,10.0.0.5:10259 a68bb53e-be84-48df-bd38-bdd82fcd4026 Service_openshif tcp 172.30.161.125:8443 10.129.0.32:8443 6cc21b3d-2c54-4c94-8ff5-d8e017269c2e Service_openshif tcp 172.30.3.144:443 10.129.0.22:8443 37996ffd-7268-4862-a27f-61cd62e09c32 Service_openshif tcp 172.30.181.107:443 10.129.0.18:8443 81d4da3c-f811-411f-ae0c-bc6713d0861d Service_openshif tcp 172.30.228.23:443 10.129.0.29:8443 ac5a4f3b-b6ba-4ceb-82d0-d84f2c41306e Service_openshif tcp 172.30.14.240:9443 10.129.0.36:9443 c88979fb-1ef5-414b-90ac-43b579351ac9 Service_openshif tcp 172.30.231.192:9001 10.128.0.5:9001,10.128.2.5:9001,10.129.0.5:9001,10.129.2.4:9001,10.130.0.3:9001,10.131.0.3:9001 fcb0a3fb-4a77-4230-a84a-be45dce757e8 Service_openshif tcp 172.30.189.92:443 10.130.0.17:8440 67ef3e7b-ceb9-4bf0-8d96-b43bde4c9151 Service_openshif tcp 172.30.67.218:443 10.129.0.9:8443 d0032fba-7d5e-424a-af25-4ab9b5d46e81 Service_openshif tcp 172.30.102.137:2379 10.0.0.3:2379,10.0.0.4:2379,10.0.0.5:2379 tcp 172.30.102.137:9979 10.0.0.3:9979,10.0.0.4:9979,10.0.0.5:9979 7361c537-3eec-4e6c-bc0c-0522d182abd4 Service_openshif tcp 172.30.198.215:9001 10.0.0.3:9001,10.0.0.4:9001,10.0.0.5:9001,10.0.128.2:9001,10.0.128.3:9001,10.0.128.4:9001 0296c437-1259-410b-a6fd-81c310ad0af5 Service_openshif tcp 172.30.198.215:9001 10.0.0.3:9001,169.254.169.2:9001,10.0.0.5:9001,10.0.128.2:9001,10.0.128.3:9001,10.0.128.4:9001 5d5679f5-45b8-479d-9f7c-08b123c688b8 Service_openshif tcp 172.30.38.253:17698 10.128.0.52:17698,10.129.0.84:17698,10.130.0.60:17698 2adcbab4-d1c9-447d-9573-b5dc9f2efbfa Service_openshif tcp 172.30.148.52:443 10.0.0.4:9202,10.0.0.5:9202 tcp 172.30.148.52:444 10.0.0.4:9203,10.0.0.5:9203 tcp 172.30.148.52:445 10.0.0.4:9204,10.0.0.5:9204 tcp 172.30.148.52:446 10.0.0.4:9205,10.0.0.5:9205 2a33a6d7-af1b-4892-87cc-326a380b809b Service_openshif tcp 172.30.67.219:9091 10.129.2.16:9091,10.131.0.16:9091 tcp 172.30.67.219:9092 10.129.2.16:9092,10.131.0.16:9092 tcp 172.30.67.219:9093 10.129.2.16:9093,10.131.0.16:9093 tcp 172.30.67.219:9094 10.129.2.16:9094,10.131.0.16:9094 f56f59d7-231a-4974-99b3-792e2741ec8d Service_openshif tcp 172.30.89.212:443 10.128.0.41:8443,10.129.0.68:8443,10.130.0.44:8443 08c2c6d7-d217-4b96-b5d8-c80c4e258116 Service_openshif tcp 172.30.102.137:2379 10.0.0.3:2379,169.254.169.2:2379,10.0.0.5:2379 tcp 172.30.102.137:9979 10.0.0.3:9979,169.254.169.2:9979,10.0.0.5:9979 60a69c56-fc6a-4de6-bd88-3f2af5ba5665 Service_openshif tcp 172.30.10.193:443 10.129.0.25:8443 ab1ef694-0826-4671-a22c-565fc2d282ec Service_openshif tcp 172.30.196.123:443 10.128.0.33:8443,10.129.0.64:8443,10.130.0.37:8443 b1fb34d3-0944-4770-9ee3-2683e7a630e2 Service_openshif tcp 172.30.158.93:8443 10.129.0.13:8443 95811c11-56e2-4877-be1e-c78ccb3a82a9 Service_openshif tcp 172.30.46.85:9001 10.130.0.16:9001 4baba1d1-b873-4535-884c-3f6fc07a50fd Service_openshif tcp 172.30.28.87:443 10.129.0.26:8443 6c2e1c90-f0ca-484e-8a8e-40e71442110a Service_openshif udp 172.30.0.10:53 10.128.0.13:5353,10.128.2.6:5353,10.129.0.39:5353,10.129.2.6:5353,10.130.0.11:5353,10.131.0.9:5353注意在这个截断的输出中，您可以看到有许多 OVN-Kubernetes 负载均衡器。OVN-Kubernetes 中的负载均衡器是服务的表示。
运行以下命令，以显示可用于命令
ovn-nbctl的选项：$ oc exec -n openshift-ovn-kubernetes -it ovnkube-node-55xs2 \ -c nbdb ovn-nbctl --help
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