The IP address of API server is at 172.0.1.1.

When the API server address communicates with the Kubelet 10250 port, it always reports an error:

E0402 03:27:12.970501 1 upgradeaware.go:310] Error proxying data from client to backend: write tcp 172.0.1.1:40190->172.0.128.204:10250: write: broken pipe E0402 03:27:13.272704 1 upgradeaware.go:310] Error proxying data from client to backend: write tcp 172.0.1.1:33676->172.0.128.243:10250: write: broken pipe E0402 03:27:14.476613 1 upgradeaware.go:310] Error proxying data from client to backend: write tcp 172.0.1.1:36802->172.0.128.31:10250: write: broken pipe

I have tried to modify the following parameters:

Net.ipv4.tcp_keepalive_time =600 Net.ipv4.tcp_keepalive_intvl = 30 Net.ipv4.tcp_keepalive_probes = 10

And execute sysctl -p to make it work, but it doesn't solve the problem, or see many of these errors.