k8s node节点无法互联容器网络

集群搭建完成后启动测试pod nginx

kubectl create deploy mytest --image=nginx -replicas=3 --port=80

default nginx-74d589986c-c2455 1/1 Running 0 9m18s 10.244.0.2 node2

在master测试

curl 10.244.0.2

ping 10.244.0.2

无响应

排查开始：

查看主机路由（因为正常情况流量应该过flannl）

root@master:~/week6# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         _gateway        0.0.0.0         UG    0      0        0 ens33
10.244.0.0      10.244.0.0      255.255.255.0   UG    0      0        0 flannel.1
10.244.2.0      10.244.2.0      255.255.255.0   UG    0      0        0 flannel.1
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 ens33

发现只有本机路由到网关，并无flannl的对端路由

排查flannl

4: flannel.1:  mtu 1450 qdisc noqueue state UNKNOWN group default

link/ether 6e:3b:9d:2b:68:17 brd ff:ff:ff:ff:ff:ff

inet6 fe80::6c3b:9dff:fe2b:6817/64 scope link

valid_lft forever preferred_lft forever

发现flannl没有地址

修改flannl的yaml重启pod

4: flannel.1:  mtu 1450 qdisc noqueue state UNKNOWN group default

    link/ether 6e:3b:9d:2b:68:17 brd ff:ff:ff:ff:ff:ff

    inet 10.244.1.0/32 scope global flannel.1

       valid_lft forever preferred_lft forever

    inet6 fe80::6c3b:9dff:fe2b:6817/64 scope link

       valid_lft forever preferred_lft forever

root@master:~/week6# route

Kernel IP routing table

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface

default         _gateway        0.0.0.0         UG    0      0        0 ens33

10.244.0.0      10.244.0.0      255.255.255.0   UG    0      0        0 flannel.1

10.244.2.0      10.244.2.0      255.255.255.0   UG    0      0        0 flannel.1

192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 ens33

验证nginx访问正常！！！！