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  • [Nginx] 博客园出现了502错误该怎么追查原因

    博客园从今天上午就开始报502错误 , 他的原因还不知道 , 暂时先说下我们遇到502的排查情况

    最大的可能性就是后端的服务不能支撑前端过来的tcp请求连接,包括连接数据库服务时的连接数问题

    1. php-fpm的进程是否启动 ,没启动肯定报这个错误

    2. tcp连接数超过了fpm的进程数

    netstat -altupn|grep EST|grep php|wc -l

    查看当前tcp连接 , 比较自己fpm的进程数

    修改配置文件中的进程数部分:

    /etc/php-fpm.d/www.conf 

    ; Note: This value is mandatory.
    pm = dynamic
    
    ; The number of child processes to be created when pm is set to 'static' and the
    ; maximum number of child processes to be created when pm is set to 'dynamic'.
    ; This value sets the limit on the number of simultaneous requests that will be
    ; served. Equivalent to the ApacheMaxClients directive with mpm_prefork.
    ; Equivalent to the PHP_FCGI_CHILDREN environment variable in the original PHP
    ; CGI.
    ; Note: Used when pm is set to either 'static' or 'dynamic'
    ; Note: This value is mandatory.
    pm.max_children = 200
    
    ; The number of child processes created on startup.
    ; Note: Used only when pm is set to 'dynamic'
    ; Default Value: min_spare_servers + (max_spare_servers - min_spare_servers) / 2
    pm.start_servers = 30
    
    ; The desired minimum number of idle server processes.
    ; Note: Used only when pm is set to 'dynamic'
    ; Note: Mandatory when pm is set to 'dynamic'
    pm.min_spare_servers = 10
    
    ; The desired maximum number of idle server processes.
    ; Note: Used only when pm is set to 'dynamic'
    ; Note: Mandatory when pm is set to 'dynamic'
    pm.max_spare_servers = 50

    3.FastCGI执行时间过长


    根据实际情况调高以下参数值
    fastcgi_connect_timeout 300;
    fastcgi_send_timeout 300;
    fastcgi_read_timeout 300;

    4.FastCGI Buffer不够
    nginx和apache一样,有前端缓冲限制,可以调整缓冲参数
    fastcgi_buffer_size 32k;
    fastcgi_buffers 8 32k;

    5.Proxy Buffer不够
    如果你用了Proxying,调整
    proxy_buffer_size 16k;
    proxy_buffers 4 16k;

    代码中有连接数据库等的错误 , 导致执行时间过长了 , 检查代码等

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  • 原文地址:https://www.cnblogs.com/taoshihan/p/14113897.html
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