1.所有节点导入flannel镜像
wget http://192.168.15.253/Resources/Kubernetes/K8S%20Cluster/oldboyedu-flannel-v1.6.2-v0.26.4.tar.gz
docker load -i oldboyedu-flannel-v1.6.2-v0.26.4.tar.gz

2.获取资源清单 

[root@master231 ~]# wget http://192.168.15.253/Resources/Kubernetes/K8S%20Cluster/kube-flannel.yml

3.部署flannel组件 

[root@master231 ~]# kubectl apply -f kube-flannel.yml
namespace/kube-flannel created
serviceaccount/flannel created
clusterrole.rbac.authorization.k8s.io/flannel created
clusterrolebinding.rbac.authorization.k8s.io/flannel created
configmap/kube-flannel-cfg created
daemonset.apps/kube-flannel-ds created
[root@master231 ~]#

4.验证flannel是否部署成功

[root@master231 ~]# kubectl get pods -o wide -n kube-flannel
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
kube-flannel-ds-flnbm 1/1 Running 0 34s 10.0.0.231 master231
kube-flannel-ds-s4vp6 1/1 Running 0 34s 10.0.0.233 worker233
kube-flannel-ds-x6gv8 1/1 Running 0 34s 10.0.0.232 worker232
[root@master231 ~]#

5.查看集群节点 

[root@master231 ~]# kubectl get no
NAME STATUS ROLES AGE VERSION
master231 Ready control-plane,master 168m v1.23.17
worker232 Ready 159m v1.23.17
worker233 Ready 159m v1.23.17
[root@master231 ~]#
[root@master231 ~]# kubectl get no -o wide
NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME
master231 Ready control-plane,master 168m v1.23.17 10.0.0.231 Ubuntu 22.04.4 LTS 5.15.0-119-generic docker://20.10.24
worker232 Ready 159m v1.23.17 10.0.0.232 Ubuntu 22.04.4 LTS 5.15.0-119-generic docker://20.10.24
worker233 Ready 159m v1.23.17 10.0.0.233 Ubuntu 22.04.4 LTS 5.15.0-119-generic docker://20.10.24
[root@master231 ~]#

6.cni0网卡重建（手动创建重启机器后会丢失配置，最好是开机自动巡检。）

如果有节点没有cni0网卡，建议大家手动创建相应的网桥设备，但是注意网段要一致

• 手动创建cni0网卡
  —> 假设 master231的flannel.1是10.100.0.0网段。
  ip link add cni0 type bridge
  ip link set dev cni0 up
  ip addr add 10.100.0.1/24 dev cni0

—> 假设 worker233的flannel.1是10.100.2.0网段。
ip link add cni0 type bridge
ip link set dev cni0 up
ip addr add 10.100.2.1/24 dev cni0

7.检查各个worker节点的网卡信息是否正确 

[root@master231 ~]# ifconfig
cni0: flags=4099 mtu 1500
inet 10.100.0.1 netmask 255.255.255.0 broadcast 0.0.0.0
ether 3a:28:99:ca:1f:85 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

…

flannel.1: flags=4163 mtu 1450
inet 10.100.0.0 netmask 255.255.255.255 broadcast 0.0.0.0
inet6 fe80::5c95:b3ff:fe77:ac9 prefixlen 64 scopeid 0x20
ether 5e:95:b3:77:0a:c9 txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 35 overruns 0 carrier 0 collisions 0

[root@master231 ~]#

[root@worker232 ~]# ifconfig
cni0: flags=4163 mtu 1450
inet 10.100.1.1 netmask 255.255.255.0 broadcast 10.100.1.255
inet6 fe80::3828:99ff:feca:1f85 prefixlen 64 scopeid 0x20
ether 3a:28:99:ca:1f:85 txqueuelen 1000 (Ethernet)
RX packets 158 bytes 15529 (15.5 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 183 bytes 41087 (41.0 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

…

flannel.1: flags=4163 mtu 1450
inet 10.100.1.0 netmask 255.255.255.255 broadcast 0.0.0.0
inet6 fe80::ec7c:8dff:fe12:5d25 prefixlen 64 scopeid 0x20
ether ee:7c:8d:12:5d:25 txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 34 overruns 0 carrier 0 collisions 0

[root@worker232 ~]#

[root@worker233 ~]# ifconfig
cni0: flags=4099 mtu 1500
inet 10.100.2.1 netmask 255.255.255.0 broadcast 0.0.0.0
ether 3a:28:99:ca:1f:85 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

…

flannel.1: flags=4163 mtu 1450
inet 10.100.2.0 netmask 255.255.255.255 broadcast 0.0.0.0
inet6 fe80::d08f:9fff:fe02:d5c5 prefixlen 64 scopeid 0x20
ether d2:8f:9f:02:d5:c5 txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 35 overruns 0 carrier 0 collisions 0

[root@worker233 ~]#