calico 根据拓扑分配IP地址

需求： node1 node2 的 pod 都分配一个网段，  node3 node4 的 pod 都分配一个网段

      -------------------
       |    router       |
       -------------------
       |                 |
---------------   ---------------
| rack-0      |   | rack-1      |
---------------   ---------------
| kube-node-1 |   | kube-node-3 |
- - - - - - - -   - - - - - - - -
| kube-node-2 |   | kube-node-4 |
- - - - - - - -   - - - - - - - -

使用pod 10.20.0.0/16，我们的目标以下设置：保留10.20.1.0/24和10.20.2.0/24池的rack-0，rack-1

通过calicoctl 命令 查看默认CIDR池， 并且删除

 1. 删除默认IP池

calicoctl delete ippools default-ipv4-ippool

2. 对node节点打标记

设置label

kubectl label node node1  rack=0
kubectl label node node2  rack=0
kubectl label node node3  rack=1
kubectl label node node3  rack=1

3. 为每个机架设置IP池

calicoctl create -f -<<EOF
apiVersion: projectcalico.org/v3
kind: IPPool
metadata:
  name: rack-0-ippool
spec:
  cidr: 10.20.1.0/24
  ipipMode: Always
  natOutgoing: true
  nodeSelector: rack == "0"
EOF

calicoctl create -f -<<EOF
apiVersion: projectcalico.org/v3
kind: IPPool
metadata:
  name: rack-1-ippool
spec:
  cidr: 10.20.2.0/24
  ipipMode: Always
  natOutgoing: true
  nodeSelector: rack == "1"
EOF

应该有两个启用的IP池，运行时可以看到它们

calicoctl get ippool -o wide
NAME                  CIDR             NAT    IPIPMODE   DISABLED   SELECTOR
rack-0-ippool         10.20.1.0/24   true   Always     false      rack == "0"
rack-1-ippool         10.20.2.0/24   true   Always     false      rack == "1"

4. 验证

kubect get pod

NAME                   READY   STATUS    RESTARTS   AGE    IP             NODE          NOMINATED NODE   READINESS GATES
nginx-5c7588df-prx4z   1/1     Running   0          6m3s   10.20.1.64     node1   <none>           <none>
nginx-5c7588df-s7qw6   1/1     Running   0          6m7s   10.20.1.129    node2   <none>           <none>
nginx-5c7588df-w7r7g   1/1     Running   0          6m3s   10.20.2.55     node3   <none>           <none>
nginx-5c7588df-62lnf   1/1     Running   0          6m3s   10.20.2.56     node4   <none>           <none>

https://docs.projectcalico.org/networking/assign-ip-addresses-topology