k8s的node节点启动flannel网络报错

[root@dk03 ~]# systemctl status flanneld.service -l
● flanneld.service - Flanneld overlay address etcd agent
   Loaded: loaded (/usr/lib/systemd/system/flanneld.service; enabled; vendor preset: disabled)
   Active: activating (start) since Wed 2020-07-15 13:42:33 CST; 42s ago
 Main PID: 26442 (flanneld)
   Memory: 19.0M
   CGroup: /system.slice/flanneld.service
           └─26442 /usr/bin/flanneld -etcd-endpoints=http://192.168.247.31:2379 -etcd-prefix=/atomic.io/network

Jul 15 13:43:11 dk03 flanneld-start[26442]: I0715 13:43:11.672337   26442 local_manager.go:179] Picking subnet in range 192.168.1.128 ... 192.168.1.128
Jul 15 13:43:11 dk03 flanneld-start[26442]: E0715 13:43:11.672391   26442 network.go:102] failed to register network: failed to acquire lease: out of subnets
Jul 15 13:43:12 dk03 flanneld-start[26442]: I0715 13:43:12.680633   26442 local_manager.go:179] Picking subnet in range 192.168.1.128 ... 192.168.1.128
Jul 15 13:43:12 dk03 flanneld-start[26442]: E0715 13:43:12.680747   26442 network.go:102] failed to register network: failed to acquire lease: out of subnets
Jul 15 13:43:13 dk03 flanneld-start[26442]: I0715 13:43:13.688856   26442 local_manager.go:179] Picking subnet in range 192.168.1.128 ... 192.168.1.128
Jul 15 13:43:13 dk03 flanneld-start[26442]: E0715 13:43:13.688954   26442 network.go:102] failed to register network: failed to acquire lease: out of subnets
Jul 15 13:43:14 dk03 flanneld-start[26442]: I0715 13:43:14.700228   26442 local_manager.go:179] Picking subnet in range 192.168.1.128 ... 192.168.1.128
Jul 15 13:43:14 dk03 flanneld-start[26442]: E0715 13:43:14.700324   26442 network.go:102] failed to register network: failed to acquire lease: out of subnets
Jul 15 13:43:15 dk03 flanneld-start[26442]: I0715 13:43:15.707832   26442 local_manager.go:179] Picking subnet in range 192.168.1.128 ... 192.168.1.128
Jul 15 13:43:15 dk03 flanneld-start[26442]: E0715 13:43:15.707872   26442 network.go:102] failed to register network: failed to acquire lease: out of subnets

提示应该是子网段注册失败
解决：
本地地址是24位掩码，flannel网络也是24位，将flannel网络掩码改了16位，再启动node节点的flannel服务

[root@dk01 ~]# etcdctl update /atomic.io/network/config '{ "Network": "192.168.1.0/16" }'
{ "Network": "192.168.1.0/16" }
[root@dk01 ~]# etcdctl get /atomic.io/network/config
{ "Network": "192.168.1.0/16" }