最大文件描述符

ulimit -SHn 1024000 echo "ulimit -SHn 1024000" >> /etc/rc.d/rc.local source /etc/rc.d/rc.local

内核参数优化/etc/sysctl.conf

#关闭ipv6net.ipv6.conf.all.disable_ipv6 = 1net.ipv6.conf.default.disable_ipv6 = 1#决定检查过期多久邻居条目net.ipv4.neigh.default.gc_stale_time=120#使用arp_announce / arp_ignore解决ARP映射问题net.ipv4.conf.default.arp_announce = 2net.ipv4.conf.all.arp_announce=2net.ipv4.conf.lo.arp_announce=2 # 避免放大攻击net.ipv4.icmp_echo_ignore_broadcasts = 1 # 开启恶意icmp错误消息保护net.ipv4.icmp_ignore_bogus_error_responses = 1#处理无源路由的包net.ipv4.conf.all.accept_source_route = 0net.ipv4.conf.default.accept_source_route = 0#core文件名中添加pid作为扩展名kernel.core_uses_pid = 1 # 开启SYN洪水攻击保护net.ipv4.tcp_syncookies = 1#修改消息队列长度kernel.msgmnb = 65536kernel.msgmax = 65536#timewait的数量，默认180000net.ipv4.tcp_max_tw_buckets = 6000net.ipv4.tcp_sack = 1net.ipv4.tcp_window_scaling = 1net.ipv4.tcp_rmem = 4096 87380 4194304net.ipv4.tcp_wmem = 4096 16384 4194304net.core.wmem_default = 8388608net.core.rmem_default = 8388608net.core.rmem_max = 16777216net.core.wmem_max = 16777216#限制仅仅是为了防止简单的DoS 攻击net.ipv4.tcp_max_orphans = 3276800#未收到客户端确认信息的连接请求的最大值net.ipv4.tcp_max_syn_backlog = 262144net.ipv4.tcp_timestamps = 0#内核放弃建立连接之前发送SYNACK 包的数量net.ipv4.tcp_synack_retries = 1#内核放弃建立连接之前发送SYN 包的数量net.ipv4.tcp_syn_retries = 1#启用timewait 快速回收net.ipv4.tcp_tw_recycle = 1#开启重用。允许将TIME-WAIT sockets 重新用于新的TCP 连接net.ipv4.tcp_tw_reuse = 1net.ipv4.tcp_mem = 94500000 915000000 927000000net.ipv4.tcp_fin_timeout = 1

然后执行以下命令重载配置

sysctl -p