lnmp搭建的服务器过段时间总是会访问不了

部署在linux上的lnmp架构之前一直运行正常，最近有一台服务器总是会突然挂掉。
检查报错日志是这样的

2017/12/14 03:29:12 [info] 25981#0: *133682417 recv() failed (104: Connection reset by peer) while waiting for request, client: 100.97.219.3, server: 0.0.0.0:80

nginx的配置如下：

user www www;
worker_processes auto;

error_log /data/wwwlogs/error_nginx.log info;
pid /var/run/nginx.pid;
worker_rlimit_nofile 51200;

events {
  use epoll;
  worker_connections 51200;
  multi_accept on;
}
http {
  #limit_req_zone $limit zone=one:10m rate=100r/s;
  #limit_conn_zone $limit zone=addr:10m;
  include mime.types;
  default_type application/octet-stream;
  server_names_hash_bucket_size 128;
  client_header_buffer_size 32k;
  large_client_header_buffers 4 32k;
  client_max_body_size 1024m;
  client_body_buffer_size 10m;
  sendfile on;
  tcp_nopush on;
  keepalive_timeout 120;
  server_tokens off;
  tcp_nodelay on;

  fastcgi_connect_timeout 300;
  fastcgi_send_timeout 300;
  fastcgi_read_timeout 300;
  fastcgi_buffer_size 64k;
  fastcgi_buffers 4 64k;
  fastcgi_busy_buffers_size 128k;
  fastcgi_temp_file_write_size 128k;
  fastcgi_intercept_errors on;
  
  server {
   ......    
  }
}

php-fpm的配置如下：

[global]
pid = run/php-fpm.pid
error_log = log/php-fpm.log
log_level = warning

emergency_restart_threshold = 30
emergency_restart_interval = 60s
process_control_timeout = 5s
daemonize = yes

;;;;;;;;;;;;;;;;;;;;
; Pool Definitions ;
;;;;;;;;;;;;;;;;;;;;

[www]
listen = /dev/shm/php-cgi.sock
listen.backlog = 4096
listen.allowed_clients = 127.0.0.1
listen.owner = www
listen.group = www
listen.mode = 0666
user = www
group = www

pm = dynamic
pm.max_children = 128
pm.start_servers = 11
pm.min_spare_servers = 8
pm.max_spare_servers = 16
pm.max_requests = 2048
pm.process_idle_timeout = 10s
request_terminate_timeout = 0
request_slowlog_timeout = 0

pm.status_path = /php-fpm_status
slowlog = log/slow.log
rlimit_files = 51200
rlimit_core = 0

catch_workers_output = yes
env[PATH] = /usr/local/bin:/usr/bin:/bin
env[TMP] = /tmp
env[TMPDIR] = /tmp
env[TEMP] = /tmp

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lnmp搭建的服务器过段时间总是会访问不了

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