centos7 十万并发 关健配置

vim /etc/sysctl.conf，添加 --开机启动加载内核参数：

fs.file-max = 65535
kernel.sem=250 32000 100 128

#关闭ipv6
net.ipv6.conf.all.disable_ipv6 = 1
net.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 = 2
net.ipv4.conf.all.arp_announce=2
net.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 = 0
net.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 = 65536
kernel.msgmax = 65536

#timewait的数量，默认180000
net.ipv4.tcp_max_tw_buckets = 6000
net.ipv4.tcp_sack = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_rmem = 4096 87380 4194304
net.ipv4.tcp_wmem = 4096 16384 4194304
net.core.wmem_default = 8388608
net.core.rmem_default = 8388608
net.core.rmem_max = 16777216
net.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 = 262144
net.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 = 1
net.ipv4.tcp_mem = 94500000 915000000 927000000
net.ipv4.tcp_fin_timeout = 1

然后执行以下命令重载配置  

sysctl -p

　　

linux修改可用的最大进程数量和可打开的最大文件数

/etc/security/limits.conf

* soft nproc 655350
* hard nproc 655350
* soft nofile 655350
* hard nofile 655350

　　

/proc/sys/kernel/sem 

250     32000   100     128 

　　

/etc/systemd/system.conf

DefaultLimitCORE=infinity
#DefaultLimitRSS=
DefaultLimitNOFILE=1024000
#DefaultLimitAS=
DefaultLimitNPROC=1024000

　　

修改 Nginx 进程最大可打开文件数（worker_processes和worker_connections）

（8核机器）

worker_processes 8;
worker_cpu_affinity 00000001 00000010 00000100 00001000 00010000 00100000 01000000 10000000;

　　

（16核机器）

worker_processes 16;
worker_cpu_affinity 
0000000000000001 0000000000000010 0000000000000100 0000000000001000 0000000000010000 0000000000100000 0000000001000000 0000000010000000 0000000100000000 0000001000000000 0000010000000000 0000100000000000 0001000000000000 0010000000000000 0100000000000000 1000000000000000;

　

worker_rlimit_nofile 655350;

#error_log logs/error.log; 
#error_log logs/error.log notice; 
#error_log logs/error.log info; 
#pid logs/nginx.pid; 
events { 
        use epoll; 
        worker_connections 655350; 
}