参考：
http://blog.csdn.net/lcx46/article/details/12418873 http://blog.sina.com.cn/s/blog_4152a9f50100mo8p.html0. 服务器配置
系统 centos 7内存 4GCPU 4核
1. 修改配置文件(/etc/sysctl.conf)
vi /etc/sysctl.conf #修改配置文件sysctl -p #配置生效
参考配置
net.core.netdev_max_backlog = 30000net.core.somaxconn = 262144net.core.rmem_default = 8388608net.core.wmem_default = 8388608net.core.rmem_max=16777216net.core.wmem_max=16777216net.ipv4.ip_local_port_range = 1024 65536net.ipv4.ip_conntrack_max = 131070net.ipv4.tcp_mem = 131072 2262144 524288net.ipv4.tcp_rmem=4096 8192 4194304net.ipv4.tcp_wmem=4096 8192 4194304net.ipv4.tcp_fin_timeout = 10net.ipv4.tcp_tw_recycle = 1net.ipv4.tcp_tw_reuse = 1net.ipv4.tcp_max_tw_buckets = 6000net.ipv4.tcp_timestamps = 0net.ipv4.tcp_window_scaling = 1net.ipv4.tcp_sack = 1net.ipv4.tcp_no_metrics_save=1net.ipv4.tcp_keepalive_time = 1200net.ipv4.tcp_syncookies = 1net.ipv4.tcp_max_orphans = 262144net.ipv4.tcp_max_syn_backlog = 262144net.ipv4.tcp_synack_retries = 2net.ipv4.tcp_syn_retries = 2net.ipv4.netfilter.ip_conntrack_tcp_timeout_established=1800net.ipv4.netfilter.ip_conntrack_max=131070kernel.sysrq = 0kernel.core_uses_pid = 1kernel.msgmnb = 65536kernel.msgmax = 65536kernel.shmmax = 68719476736kernel.shmall = 4294967296kernel.randomize_va_space = 1kernel.exec-shield = 1net.ipv4.ip_forward = 0net.ipv4.neigh.default.gc_stale_time=120net.ipv4.conf.default.accept_source_route = 0net.ipv4.conf.default.rp_filter=0net.ipv4.conf.all.rp_filter=0 net.ipv4.conf.all.arp_announce=2 net.ipv4.conf.lo.arp_announce=2
2. 调整系统资源－－最大文件句柄数
echo -ne "* soft nofile 65536* hard nofile 65536" >>/etc/security/limits.conf