# curl http://10.2.176.14:30980/h5/intro
curl: (7) Failed connect to 10.2.176.14:30980; 连接超时
# curl http://10.2.176.14:30980/h5/intro
<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no" />
<meta name="format-detection" content="telephone=no">
虽然是偶发现象，但是本身访问量就不大，所以出现的概率还挺高的。 docker 容器内是一个 nginx+tomcat。 观察了 1 天了，不知道啥毛病。 ipv4 的 tcp 的连接参数已经改了。
/etc/sysctl.conf
net.ipv4.ip_local_port_range = 1024 65535
net.core.rmem_max=16777216
net.core.wmem_max=16777216
net.ipv4.tcp_rmem=4096 87380 16777216
net.ipv4.tcp_wmem=4096 65536 16777216
net.ipv4.tcp_fin_timeout = 10
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_window_scaling = 0
net.ipv4.tcp_sack = 0
net.core.netdev_max_backlog = 30000
net.ipv4.tcp_no_metrics_save=1
net.core.somaxconn = 26214
net.ipv4.tcp_syncookies = 0
net.ipv4.tcp_max_orphans = 262144
net.ipv4.tcp_max_syn_backlog = 262144
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 2
vm.overcommit_memory = 1
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