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  • php-fpm配置笔记

    php-fpm配置不当,导致服务器经常出现502错误,上个学期多次调整都没有解决,网上找来资料,大都是增加max_children,可是我都加到顶了,php-fpm log里面还是有大量的警告:

    eems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers), spawning 16 children, there are 0 idle, and 88 total children

    不想看英文,一看就头晕,但是502更头晕,特别是昨天,刚重启了lnmp没多久,容不得松口气,就看到负载飙到20多,一开网站,又特么502了。

    硬着头皮看默认配置里面的英文注释,才发现自己的三个参数配置貌似有相当大的问题:

    Choose how the process manager will control the number of child processes.
    ; Possible Values:
    ;   static  - a fixed number (pm.max_children) of child processes;
    ;   dynamic - the number of child processes are set dynamically based on the
    ;             following directives. With this process management, there will be
    ;             always at least 1 children.
    ;             pm.max_children      - the maximum number of children that can
    ;                                    be alive at the same time.
    ;             pm.start_servers     - the number of children created on startup.
    ;             pm.min_spare_servers - the minimum number of children in 'idle'
    ;                                    state (waiting to process). If the number
    ;                                    of 'idle' processes is less than this
    ;                                    number then some children will be created.
    ;             pm.max_spare_servers - the maximum number of children in 'idle'
    ;                                    state (waiting to process). If the number
    ;                                    of 'idle' processes is greater than this
    ;                                    number then some children will be killed.
    ;  ondemand - no children are created at startup. Children will be forked when
    ;             new requests will connect. The following parameter are used:
    ;             pm.max_children           - the maximum number of children that
    ;                                         can be alive at the same time.
    ;             pm.process_idle_timeout   - The number of seconds after which
    ;                                         an idle process will be killed.
    ; Note: This value is mandatory.

    ; The number of child processes to be created when pm is set to 'static' and the
    ; maximum number of child processes when pm is set to 'dynamic' or 'ondemand'.
    ; 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. The below defaults are based on a server without much resources. Don't
    ; forget to tweak pm.* to fit your needs.
    ; Note: Used when pm is set to 'static', 'dynamic' or 'ondemand'
    ; Note: This value is mandatory.
    pm.max_children = 5
    ; 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 = 2
    ; 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 = 1
    ; 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 = 3

    注释上貌似是说,static模式时,只有pm.max_children生效,dynamic模式时,pm.max_children依然生效,另外:

    pm.start_server  #控制服务启动时创建的进程数,

    pm.min_spare_servers  #控制最小备用进程数

    pm.max_spare_servers  #最大备用进程数

    spare_servers翻译成备用进程,不知道合适不适合,如果真这样,那我之前的配置就让人无奈了: pm.min_space_servers 20,pm.max_spare_servers 80,pm.max_children 80,会不会是因为备用的太多才导致502呢?

    另外,下面的具体配置里面,注释中给出了计算pm.start_servers默认值的公式:

    Default Value: min_spare_servers + (max_spare_servers - min_spare_servers) / 2

    按这个公式,我之前的pm.start_servers应该是 20+(80-20)/2=50,可是我当时设置的是20…

    重新规划如下:

    pm = dynamic
    pm.max_children =80
    pm.start_servers = 12
    pm.min_spare_servers = 4
    pm.max_spare_servers = 20
    rlimit_files = 65535
    pm.max_requests = 102400

    貌似要好点了,内存使用不像之前那么夸张了:

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  • 原文地址:https://www.cnblogs.com/canphp/p/4080609.html
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