参考文章：http://blog.****.net/ctthuangcheng/article/details/8596818
[root@mdw- gpadmin]# vi /etc/sysctl.conf
追加添加如下：
net.ipv4.tcp_keepalive_time=
net.ipv4.tcp_keepalive_intvl=
net.ipv4.tcp_keepalive_probes=
使生效：
[root@mdw- gpadmin]# sysctl -p
kernel.shmmax =
kernel.shmmni =
kernel.shmall =
kernel.sem =
kernel.sysrq =
kernel.core_uses_pid =
kernel.msgmnb =
kernel.msgmax =
kernel.msgmni =
net.ipv4.tcp_syncookies =
net.ipv4.ip_forward =
net.ipv4.conf.default.accept_source_route =
net.ipv4.tcp_tw_recycle =
net.ipv4.tcp_max_syn_backlog =
net.ipv4.conf.all.arp_filter =
net.ipv4.ip_local_port_range =
net.core.netdev_max_backlog =
net.core.rmem_max =
net.core.wmem_max =
vm.overcommit_memory =
net.ipv4.tcp_keepalive_time =
net.ipv4.tcp_keepalive_intvl =
net.ipv4.tcp_keepalive_probes =
查看：
[root@mdw- gpadmin]# sysctl -a | grep keepalive
net.ipv4.tcp_keepalive_time =
net.ipv4.tcp_keepalive_probes =
net.ipv4.tcp_keepalive_intvl =