可以参考《Kubernetes IPVS模式下服务间长连接通讯的优化，解决Connection reset by peer问题》
先看节点的系统参数：
sysctl net.ipv4.tcp_keepalive_time net.ipv4.tcp_keepalive_probes net.ipv4.tcp_keepalive_intvl
net.ipv4.tcp_keepalive_time = 7200
net.ipv4.tcp_keepalive_probes = 9
net.[......]