nginx错误502＆资源暂时不可用）连接到上游，客户端

这是我的第一个nginx。 对于我的新服务器上的所有网站，似乎有一次nginx已经服务了一些stream量，它开始服务“ 错误502 – 错误的网关！ ”。 让我们来看看一些日志和configuration…

操作系统 ：Ubuntu 16.04（服务器）

硬件 ：6核心，12GB内存

面板 ：ISPConfig

• Linux的正常运行时间值可以被信任以确定停机时间吗？
• Ubuntu的服务器上的神秘磁盘空间消耗
• IPTables多VLAN NAT到多个IP
• `mount –make-private /`的含义
• / mnt没有安装，或不好的select

nginx版本 ：1.10.3

/var/www/example/log/error.log ：

 : Resource temporarily unavailable) while connecting to upstream, client: 216.170.123.179, server: example.com, request: "GET /KHFxygk9 HTTP/1.1", upstream: "fastcgi://unix:/var/lib/php7.0-fpm/web3.sock:", host: "example.com", referrer: "http://example.com/" 2017/08/10 06:01:06 [error] 15408#15408: *31372 connect() to unix:/var/lib/php7.0-fpm/web3.sock failed (11: Resource temporarily unavailable) while connecting to upstream, client: 192.3.114.12, server: example.com, request: "GET /jiPNQjwp HTTP/1.1", upstream: "fastcgi://unix:/var/lib/php7.0-fpm/web3.sock:", host: "example.com", referrer: "http://example.com/" 

/etc/php/7.0/fpm/pool.d/www.conf ：

 [www] user = www-data group = www-data listen = /run/php/php7.0-fpm.sock listen.owner = www-data listen.group = www-data pm = dynamic pm.max_children = 12 pm.start_servers = 2 pm.min_spare_servers = 1 pm.max_spare_servers = 3 pm.max_requests = 500 

/etc/nginx/nginx.conf ：

 user www-data; worker_processes auto; pid /run/nginx.pid; events { worker_connections 768; } http { ## # Basic Settings ## sendfile on; tcp_nopush on; tcp_nodelay on; keepalive_timeout 65; types_hash_max_size 2048; include /etc/nginx/mime.types; default_type application/octet-stream; ## # SSL Settings ## ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # Dropping SSLv3, ref: POODLE ssl_prefer_server_ciphers on; ## # Logging Settings ## access_log /var/log/nginx/access.log; error_log /var/log/nginx/error.log; ## # Gzip Settings ## gzip on; gzip_disable "msie6"; ## # Virtual Host Configs ## include /etc/nginx/conf.d/*.conf; include /etc/nginx/sites-enabled/*; } 

~# systemctl status php7.0-fpm ：

 ● php7.0-fpm.service - The PHP 7.0 FastCGI Process Manager Loaded: loaded (/lib/systemd/system/php7.0-fpm.service; enabled; vendor preset: enabled) Active: active (running) since Thu 2017-08-10 04:44:16 UTC; 1h 30min ago Process: 20310 ExecReload=/bin/kill -USR2 $MAINPID (code=exited, status=0/SUCCESS) Process: 20302 ExecReload=/usr/lib/php/php7.0-fpm-checkconf (code=exited, status=0/SUCCESS) Process: 13060 ExecStartPre=/usr/lib/php/php7.0-fpm-checkconf (code=exited, status=0/SUCCESS) Main PID: 13070 (php-fpm7.0) Status: "Processes active: 20, idle: 12, Requests: 6874, slow: 0, Traffic: 0.3req/sec" CGroup: /system.slice/php7.0-fpm.service ├─13070 php-fpm: master process (/etc/php/7.0/fpm/php-fpm.conf) ├─13072 php-fpm: pool apps-{fpm_domain} ├─13073 php-fpm: pool apps-{fpm_domain} ├─13074 php-fpm: pool ispconfig ├─13075 php-fpm: pool ispconfig ├─13076 php-fpm: pool web1 ├─13077 php-fpm: pool web1 ├─13079 php-fpm: pool web2 ├─13080 php-fpm: pool web3 ├─13081 php-fpm: pool web3 ├─13082 php-fpm: pool web4 ├─13083 php-fpm: pool web4 ├─13084 php-fpm: pool web5 ├─13085 php-fpm: pool web5 ├─13087 php-fpm: pool www ├─13088 php-fpm: pool www ├─16186 php-fpm: pool web3 ├─16603 php-fpm: pool web3 ├─16604 php-fpm: pool web3 ├─16605 php-fpm: pool web3 ├─16609 php-fpm: pool web3 ├─16614 php-fpm: pool web3 ├─16629 php-fpm: pool web3 ├─16630 php-fpm: pool web3 ├─18019 php-fpm: pool web2 ├─18026 php-fpm: pool web2 ├─18027 php-fpm: pool web2 ├─18028 php-fpm: pool web2 ├─18369 php-fpm: pool web2 ├─18370 php-fpm: pool web2 ├─18410 php-fpm: pool web2 ├─18411 php-fpm: pool web2 └─18413 php-fpm: pool web2 Aug 10 04:44:16 web1.example.com systemd[1]: Stopped The PHP 7.0 FastCGI Process Manager. Aug 10 04:44:16 web1.example.com systemd[1]: Starting The PHP 7.0 FastCGI Process Manager... Aug 10 04:44:16 web1.example.com systemd[1]: Started The PHP 7.0 FastCGI Process Manager.