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漫画网站建设,无锡seo关键词排名,炫的手机网站,门户网站的特点及优势数据库连接错误#xff0c;具体是 网络连接问题​ 导致的。错误信息 Cannot assign requested address 表示系统无法分配本地地址来建立数据库连接。报错截取如下#xff1a;{code: 10501,message: SQLSTATE[HY000] [2002] Cannot…数据库连接错误具体是网络连接问题​ 导致的。错误信息 Cannot assign requested address 表示系统无法分配本地地址来建立数据库连接。报错截取如下{code: 10501,message: SQLSTATE[HY000] [2002] Cannot assign requested address,traces: [{name: think\\db\\exception\\PDOException,file: \/www\/wwwroot\/zjjgzyxy\/vendor\/topthink\/think-orm\/src\/db\/PDOConnection.php,line: 797,code: 10501,message: SQLSTATE[HY000] [2002] Cannot assign requested address,trace: [{file: \/www\/wwwroot\/zjjgzyxy\/vendor\/topthink\/think-orm\/src\/db\/connector\/Mysql.php,line: 66,function: getPDOStatement,class: think\\db\\PDOConnection,type: -},}这个错误通常在高并发场景下出现。首先排查php及mysql配置文件。优化数据库连接管理增加复用减少频繁创建新连接。具体操作步骤编辑 /usr/local/php/etc/php-fpm.conf 或 www.confPHP-FPM配置1.连接池设置pm dynamicpm.max_children 50pm.start_servers 5pm.min_spare_servers 5pm.max_spare_servers 35pm.max_requests 1000 # 进程处理1000个请求后重启避免内存泄漏2.进程管理ps aux | grep php-fpm #查看当前FPM进程状态service php-fpm restart #重启FPMNginx配置1. 连接数限制编辑 /usr/local/nginx/conf/nginx.confworker_processes auto; # 自动设置工作进程数worker_connections 10240; # 每个工作进程最大连接数multi_accept on;use epoll;查看当前连接状态netstat -an | grep :80 | wc -l2.反向代理超时在server或location块中location ~ \.php$ {fastcgi_connect_timeout 300;fastcgi_send_timeout 300;fastcgi_read_timeout 300;fastcgi_buffer_size 64k;fastcgi_buffers 4 64k;}MySQL配置1. 连接数设置编辑 /etc/my.cnf[mysqld]max_connections 1000max_connect_errors 1000wait_timeout 600interactive_timeout 600mysql -e show status like Threads_connected; 查看当前连接数mysql -e show variables like max_connections; 查看最大连接数2. 连接池优化查看当前连接状态mysql -e show processlist;mysql -e show status like %connection%;重启命令重启PHP-FPMservice php-fpm restart重启Nginxservice nginx restart重启MySQLservice mysql restart检查服务器资源free -h 查看可用内存mysql -e SHOW STATUS LIKE Threads_connected; 查看当前连接数还是无法解决则查看服务器文件编辑/etc/sysctl.conf文件打开文件nano /etc/sysctl.conf添加或修改以下参数net.ipv4.tcp_max_syn_backlog 16384net.ipv4.tcp_synack_retries 1net.ipv4.tcp_fin_timeout 5 # 从10改为5秒net.ipv4.tcp_keepalive_time 1200net.ipv4.tcp_keepalive_probes 3net.ipv4.tcp_keepalive_intvl 5net.ipv4.conf.all.send_redirects 0net.ipv4.conf.default.send_redirects 0net.ipv4.conf.all.accept_redirects 0vm.swappiness 5net.core.rmem_max 2048000net.core.wmem_max 2048000net.ipv4.ip_local_port_range10000 65000 # 从40000-60000改为10000-65000net.ipv4.ip_local_reserved_ports48200-48253net.ipv4.neigh.default.gc_thresh1 10240net.ipv4.neigh.default.gc_thresh2 20480net.ipv4.neigh.default.gc_thresh3 40960vm.max_map_count262144# 添加的参数 ↓net.ipv4.tcp_tw_reuse 1 # 开启TIME_WAIT套接字重用net.ipv4.tcp_tw_recycle 1 # 开启TIME_WAIT套接字快速回收net.ipv4.tcp_max_tw_buckets 20000 # 限制TIME_WAIT最大数量net.core.somaxconn 65535 # 增加监听队列长度net.ipv4.tcp_syncookies 1 # 开启SYN cookiesnet.ipv4.tcp_abort_on_overflow 0 # 不拒绝新的连接请求立即生效命令终端执行sysctl -psysctl -p 如果不行尝试/sbin/sysctl -p监控效果观察无法分配请求的地址错误是否消失、持续监控TIME_WAIT连接数netstat -an | grep TIME_WAITnetstat -an | grep 3306