偶遇 kube-proxy ipvs 模式不能正常工作，报错如下：
W0301 09:14:39.492670 1 proxier.go:498] Failed to load kernel module ip_vs with modprobe. You can ignore this message when kube-proxy is running inside container without mounting /lib/modules
W0301 09:14:39.493401 1 proxier.go:498] Failed to load kernel module ip_vs_rr with modprobe. You can ignore this message when kube-proxy is running inside container without mounting /lib/modules
W0301 09:14:39.494103 1 proxier.go:498] Failed to load kernel module ip_vs_wrr with modprobe. You can ignore this message when kube-proxy is running inside container without mounting /lib/modules
W0301 09:14:39.494841 1 proxier.go:498] Failed to load kernel module ip_vs_sh with modprobe. You can ignore this message when kube-proxy is running inside container without mounting /lib/modules
W0301 09:14:39.500439 1 proxier.go:498] Failed to load kernel module ip_vs with modprobe. You can ignore this message when kube-proxy is running inside container without mounting /lib/modules
W0301 09:14:39.501168 1 proxier.go:498] Failed to load kernel module ip_vs_rr with modprobe. You can ignore this message when kube-proxy is running inside container without mounting /lib/modules
W0301 09:14:39.501883 1 proxier.go:498] Failed to load kernel module ip_vs_wrr with modprobe. You can ignore this message when kube-proxy is running inside container without mounting /lib/modules
W0301 09:14:39.502612 1 proxier.go:498] Failed to load kernel module ip_vs_sh with modprobe. You can ignore this message when kube-proxy is running inside container without mounting /lib/modules
这是由于 kube-proxy 容器没能自动挂载宿主机内核模块导致的。
可以手动在宿主机执行命令，挂载需要的内核模块：
[root@machine ~]# modprobe ip_vs
[root@machine ~]# modprobe ip_vs_rr
[root@machine ~]# modprobe ip_vs_wrr
[root@machine ~]# modprobe ip_vs_sh
然后，重启 kube-proxy，发现已经没有原来的警告，且工作在 ipvs 代理模式了
I0301 09:19:09.567473 1 server_others.go:176] Using ipvs Proxier.
W0301 09:19:09.567860 1 proxier.go:380] clusterCIDR not specified, unable to distinguish between internal and external traffic
W0301 09:19:09.567872 1 proxier.go:386] IPVS scheduler not specified, use rr by default
I0301 09:19:09.568520 1 server.go:562] Version: v1.14.2
I0301 09:19:09.580637 1 conntrack.go:52] Setting nf_conntrack_max to 131072
I0301 09:19:09.582465 1 config.go:102] Starting endpoints config controller
I0301 09:19:09.582487 1 controller_utils.go:1027] Waiting for caches to sync for endpoints config controller
I0301 09:19:09.582549 1 config.go:202] Starting service config controller
I0301 09:19:09.582557 1 controller_utils.go:1027] Waiting for caches to sync for service config controller
I0301 09:19:09.682604 1 controller_utils.go:1034] Caches are synced for service config controller
I0301 09:19:09.682604 1 controller_utils.go:1034] Caches are synced for endpoints config controller
