kubernetes - 使用 192.168.0.0/16 或其他 iprange 作为 kubernetes + flannel 的 pod cidr

Question

在教程中https://kubernetes.io/docs/setup/independent/create-cluster-kubeadm/ ，它说

For flannel to work correctly, you must pass --pod-network-cidr=10.244.0.0/16 to kubeadm init..

如何传递其他cidr，例如--pod-network-cidr=192.168.0.0/16？

Answer 1

按照教程中的相同步骤进行操作，除了:

(1) kubeadm reset 之后，清除主节点和从节点上较早的网络接口(interface)。

sudo ip link del cni0
sudo ip link del flannel.1
sudo systemctl restart network

(2) 运行 kubeadm init --pod-network-cidr=192.168.0.0/16

(3) 下载kube-flannel.yml文件，更改硬编码 10.244.0.0至192.168.0.0 ，然后执行 kubectl create -f kube-flannel.yml .

测试结果

$ k get po -o=wide
NAME                         READY     STATUS    RESTARTS   AGE       IP             NODE
h2-75cb7756c6-r4gkj          1/1       Running   0          5m        192.168.1.14   slave1
h2-75cb7756c6-xfstk          1/1       Running   0          16m       192.168.0.5    master
jobserver-58bf6985f9-77mdd   1/1       Running   0          16m       192.168.0.6    master
jobserver-58bf6985f9-h9hlx   1/1       Running   0          5m        192.168.1.15   slave1

# ping pod on slave
$ ping 192.168.1.14  
PING 192.168.1.14 (192.168.1.14) 56(84) bytes of data.
64 bytes from 192.168.1.14: icmp_seq=1 ttl=63 time=0.454 ms

# ping pod on master
$ ping 192.168.0.5
PING 192.168.0.5 (192.168.0.5) 56(84) bytes of data.
64 bytes from 192.168.0.5: icmp_seq=1 ttl=64 time=0.143 ms

# ping docker container on the same node
$ ping 172.18.0.2    
PING 172.18.0.2 (172.18.0.2): 56 data bytes
64 bytes from 172.18.0.2: seq=0 ttl=241 time=21.580 ms