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NetworkPolicy 日志

NetworkPolicy 为 Kubernetes 提供的网络策略接口，Kube-OVN 通过 OVN 的 ACL 进行了实现。 使用了 NetworkPolicy 后如果出现网络不通的情况，难以判断是网络故障问题还是 NetworkPolicy 规则设置问题导致的网络中断。 Kube-OVN 提供了 NetworkPolicy 日志功能，帮助管理员快速定位 NetworkPolicy Drop 规则是否命中，并记录有哪些非法访问。

NetworkPolicy 日志功能一旦开启，对每个命中 Drop 规则的数据包都需要打印日志，会带来额外性能开销。 在恶意攻击下，短时间大量日志可能会耗尽 CPU。我们建议在生产环境默认关闭日志功能，在需要排查问题时，动态开启日志。

开启 NetworkPolicy 日志

在需要开启日志记录的 NetworkPolicy 中增加 annotation ovn.kubernetes.io/enable_log，如下所示：

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: default-deny-ingress
  namespace: kube-system
  annotations:
    ovn.kubernetes.io/enable_log: "true"
spec:
  podSelector: {}
  policyTypes:
  - Ingress

接下来可以在对应 Pod 所在主机的 /var/log/ovn/ovn-controller.log 中观察到被丢弃数据包的日志：

# tail -f /var/log/ovn/ovn-controller.log
2022-07-20T05:55:03.229Z|00394|acl_log(ovn_pinctrl0)|INFO|name="<unnamed>", verdict=drop, severity=warning, direction=to-lport: udp,vlan_tci=0x0000,dl_src=00:00:00:21:b7:d1,dl_dst=00:00:00:8d:0b:86,nw_src=10.16.0.10,nw_dst=10.16.0.7,nw_tos=0,nw_ecn=0,nw_ttl=63,tp_src=54343,tp_dst=53
2022-07-20T05:55:06.229Z|00395|acl_log(ovn_pinctrl0)|INFO|name="<unnamed>", verdict=drop, severity=warning, direction=to-lport: udp,vlan_tci=0x0000,dl_src=00:00:00:21:b7:d1,dl_dst=00:00:00:8d:0b:86,nw_src=10.16.0.9,nw_dst=10.16.0.7,nw_tos=0,nw_ecn=0,nw_ttl=63,tp_src=44187,tp_dst=53
2022-07-20T05:55:08.230Z|00396|acl_log(ovn_pinctrl0)|INFO|name="<unnamed>", verdict=drop, severity=warning, direction=to-lport: udp,vlan_tci=0x0000,dl_src=00:00:00:21:b7:d1,dl_dst=00:00:00:8d:0b:86,nw_src=10.16.0.10,nw_dst=10.16.0.7,nw_tos=0,nw_ecn=0,nw_ttl=63,tp_src=54274,tp_dst=53
2022-07-20T05:55:11.231Z|00397|acl_log(ovn_pinctrl0)|INFO|name="<unnamed>", verdict=drop, severity=warning, direction=to-lport: udp,vlan_tci=0x0000,dl_src=00:00:00:21:b7:d1,dl_dst=00:00:00:8d:0b:86,nw_src=10.16.0.9,nw_dst=10.16.0.7,nw_tos=0,nw_ecn=0,nw_ttl=63,tp_src=32778,tp_dst=53
2022-07-20T05:55:11.231Z|00398|acl_log(ovn_pinctrl0)|INFO|name="<unnamed>", verdict=drop, severity=warning, direction=to-lport: udp,vlan_tci=0x0000,dl_src=00:00:00:21:b7:d1,dl_dst=00:00:00:8d:0b:86,nw_src=10.16.0.9,nw_dst=10.16.0.7,nw_tos=0,nw_ecn=0,nw_ttl=63,tp_src=34188,tp_dst=53
2022-07-20T05:55:13.231Z|00399|acl_log(ovn_pinctrl0)|INFO|name="<unnamed>", verdict=drop, severity=warning, direction=to-lport: udp,vlan_tci=0x0000,dl_src=00:00:00:21:b7:d1,dl_dst=00:00:00:8d:0b:86,nw_src=10.16.0.10,nw_dst=10.16.0.7,nw_tos=0,nw_ecn=0,nw_ttl=63,tp_src=43290,tp_dst=53
2022-07-20T05:55:22.096Z|00400|acl_log(ovn_pinctrl0)|INFO|name="<unnamed>", verdict=drop, severity=warning, direction=to-lport: icmp,vlan_tci=0x0000,dl_src=00:00:00:6c:42:91,dl_dst=00:00:00:a5:d7:63,nw_src=10.16.0.9,nw_dst=10.16.0.10,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0
2022-07-20T05:55:22.097Z|00401|acl_log(ovn_pinctrl0)|INFO|name="<unnamed>", verdict=drop, severity=warning, direction=to-lport: icmp,vlan_tci=0x0000,dl_src=00:00:00:6c:42:91,dl_dst=00:00:00:a5:d7:63,nw_src=10.16.0.9,nw_dst=10.16.0.10,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0
2022-07-20T05:55:22.098Z|00402|acl_log(ovn_pinctrl0)|INFO|name="<unnamed>", verdict=drop, severity=warning, direction=to-lport: icmp,vlan_tci=0x0000,dl_src=00:00:00:6c:42:91,dl_dst=00:00:00:a5:d7:63,nw_src=10.16.0.9,nw_dst=10.16.0.10,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0

关闭 NetworkPolicy 日志

将对应 NetworkPolicy 中的 annotation ovn.kubernetes.io/enable_log 设置为 false 即可关闭 NetworkPolicy 日志：

kubectl annotate networkpolicy -n kube-system default-deny-ingress ovn.kubernetes.io/enable_log=false --overwrite

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