1、先查看系统最大打开文件数

# 查看当前系统打开文件最大数
# ulimit -a
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 256946
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 1000000               # 这里
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 8192
cpu time               (seconds, -t) unlimited
max user processes              (-u) 256946
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

2、修改系统最大文件描述符(重新登录生效)

# cat /etc/security/limits.conf |tail -5
# End of file
<domain>      <type>  <item>         <value>
*             soft   nofile          204800
*             hard   nofile          204800

# 理解生效
ulimit -SHn 294800

# 再次查看
ulimit -a  或 ulimit -n

3、查看系统总限制大小

# cat /proc/sys/fs/file-max
6305734

4、修改nginx打开文件数据限制大小

# cat /etc/nginx/nginx.conf |head -10

user  nginx;
worker_processes  auto;

error_log  /var/log/nginx/error.log notice;
pid        /var/run/nginx.pid;
worker_rlimit_nofile 20480;         # 这里

5、nginx stream配置

http {
......
......
.....
}

stream {

        log_format proxy '$remote_addr [$time_local]'
                 '$protocol $status $bytes_sent $bytes_received '
                 '$session_time "$upstream_addr" '
                 '"$upstream_bytes_sent" "$upstream_bytes_received" "$upstream_connect_time"';

        error_log  /var/log/nginx/udp-error.log    error;
        access_log /var/log/nginx/udp-access.log proxy ;
        server{
		preread_buffer_size 0;
		listen 30000-30150 udp;    # 后面不要加 reuseport否则会报错
		listen 31000-31100 udp;
		listen 32000-32100 udp;  
                # proxy_pass 139.217.184.100:$server_port;
                proxy_pass 52.131.225.53:$server_port;   # 这里指向网关地址(网关如果是k8s就写k8s slbip或容器地址就写容器ip)
        }


}