问题：你如何才能知道，k8s集群中，某个pod网段是属于节点的？
有两种方法，可以轻松获取到pod网段所在的主机信息...
方法 一 ：通过kubectl get pod -o wide来查看
[root@nccztsjb-node-16 ~]# kubectl get pod -A -o wide | grep 172.23.106 kube-system coredns-6bd4c84698-tmnkd 1/1 Running 0 13d 172.23.106.1 nccztsjb-node-16 <none> <none> kube-system dns-autoscaler-5556d9d664-p52v4 1/1 Running 0 13d 172.23.106.2 nccztsjb-node-16 <none> <none> kube-system kube-eventer-5897cc5f78-nf4f2 1/1 Running 0 13d 172.23.106.19 nccztsjb-node-16 <none> <none> kube-system kubernetes-cronhpa-controller-6cdbbf9d7f-tgsk6 1/1 Running 0 13d 172.23.106.22 nccztsjb-node-16 <none> <none> kube-system metrics-server-6c86bfbc9c-d6h9j 2/2 Running 1 3d2h 172.23.106.27 nccztsjb-node-16 <none> <none> kube-system monitor-agent-r5qph 1/1 Running 0 13d 172.23.106.12 nccztsjb-node-16 <none> <none> kube-system redis-commander-7f885d97bc-9z5dq 1/1 Running 0 13d 172.23.106.21 nccztsjb-node-16 <none> <none> kuboard kuboard-agent-2-866c9f9d97-r62rs 1/1 Running 2 13d 172.23.106.9 nccztsjb-node-16 <none> <none> kuboard kuboard-agent-5949665f49-7crwc 1/1 Running 2 13d 172.23.106.10 nccztsjb-node-16 <none> <none> kuboard kuboard-questdb-5bf9ccf6c9-ws8gg 1/1 Running 0 13d 172.23.106.13 nccztsjb-node-16 <none> <none> kuboard kuboard-v3-7cdff587cf-t9ztn 1/1 Running 0 13d 172.23.106.6 nccztsjb-node-16 <none> <none> logging log-fluentd-nwrbs 1/1 Running 0 13d 172.23.106.18 nccztsjb-node-16 <none> <none> minio-default-tenant minio-default-tenant-console-85c5d55578-gjz6n 1/1 Running 0 13d 172.23.106.15 nccztsjb-node-16 <none> <none> minio-default-tenant minio-default-tenant-ss-0-2 1/1 Running 0 13d 172.23.106.14 nccztsjb-node-16 <none> <none> yks autoops-568487d9d5-p6j7g 1/1 Running 0 13d 172.23.106.8 nccztsjb-node-16 <none> <none> yks nfs-client-provisioner-79598fb9c9-dnpwk 1/1 Running 0 13d 172.23.106.7 nccztsjb-node-16 <none> <none> yonbip iuap-devops-console-7f5b445b45-hzfbl 1/1 Running 0 13d 172.23.106.26 nccztsjb-node-16 <none> <none> yonbip iuap-yks-console-899bf7659-nfjqc 1/1 Running 0 13d 172.23.106.24 nccztsjb-node-16 <none> <none> yonbip iuap-yks-manage-5cc4f4d7d5-ptrfv 1/1 Running 0 13d 172.23.106.25 nccztsjb-node-16 <none> <none> yonbip iuap-ypr-56694bcdb9-gn8lc 1/1 Running 0 13d 172.23.106.20 nccztsjb-node-16 <none> <none> [root@nccztsjb-node-16 ~]#
左面的一列是pod的ip,右面的一列是所在的主机节点
方法 二：通过在某个calico节点上，查看路由信息
[root@iuap120 ~]# ip r default via 172.16.8.254 dev eth0 proto static metric 100 172.16.8.0/24 dev eth0 proto kernel scope link src 172.16.8.120 metric 100 172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown 172.23.16.128/26 via 172.16.8.122 dev eth0 proto bird 172.23.20.0/26 via 172.16.8.236 dev eth0 proto bird 172.23.41.192/26 via 172.16.8.233 dev eth0 proto bird 172.23.48.64/26 via 172.16.8.247 dev eth0 proto bird 172.23.56.0/26 via 172.16.9.79 dev tunl0 proto bird onlink 172.23.97.0/26 via 172.16.8.169 dev eth0 proto bird 172.23.111.64/26 via 172.16.8.121 dev eth0 proto bird 172.23.123.64/26 via 172.16.8.239 dev eth0 proto bird 172.23.127.0/26 via 172.16.8.96 dev eth0 proto bird 172.23.172.128/26 via 172.16.8.219 dev eth0 proto bird 172.23.178.128/26 via 172.16.8.240 dev eth0 proto bird 172.23.179.0/26 via 172.16.8.234 dev eth0 proto bird 172.23.185.0/26 via 172.16.8.242 dev eth0 proto bird blackhole 172.23.191.192/26 proto bird 172.23.191.211 dev calic4b6be6ed36 scope link 172.23.191.212 dev cali7df11ab4fb9 scope link 172.23.191.213 dev calif4b76ee927f scope link 172.23.207.128/26 via 172.16.8.237 dev eth0 proto bird 172.23.223.0/26 via 172.16.8.119 dev eth0 proto bird 172.23.236.192/26 via 172.16.9.78 dev tunl0 proto bird onlink 172.23.248.192/26 via 172.16.8.245 dev eth0 proto bird 172.23.253.128/26 via 172.16.9.80 dev tunl0 proto bird onlink
左一列是pod网段信息，右面一列是所在的主机信息。