我正在Ubuntu 14.04.4 LTS运行一个服务器Apache/2.4.7，并且我的error.log文件经常收到以下此类消息：
[Thu Sep 01 19:45:40.571637 2016] [mpm_prefork:info] [pid 1696] AH00162: server seems busy, (you may need to increase StartServers, or Min/MaxSpareServers), spawning 8 children, there are 3 idle, and 17 total children
[Thu Sep 01 19:47:03.699939 2016] [mpm_prefork:info] [pid 1696] AH00162: server seems busy, (you may need to increase StartServers, or Min/MaxSpareServers), spawning 8 children, there are 4 idle, and 17 total children
[Thu Sep 01 19:48:35.856132 2016] [mpm_prefork:info] [pid 1696] AH00162: server seems busy, (you may need to increase StartServers, or Min/MaxSpareServers), spawning 8 children, there are 2 idle, and 20 total children
我已经改变了我的apache2.conf，它看起来如下所示：
# prefork MPM
# StartServers: number of server processes to start
# MinSpareServers: minimum number of server processes which are kept spare
# MaxSpareServers: maximum number of server processes which are kept spare
# MaxRequestWorkers: maximum number of server processes allowed to start (was: MaxClients)
# MaxConnectionsPerChild: maximum number of requests a server process serves (was: MaxRequestsPerChild)
<IfModule mpm_prefork_module>
StartServers 100
MinSpareServers 30
MaxSpareServers 60
ServerLimit 400
MaxRequestWorkers 400
MaxConnectionsPerChild 10000
</IfModule>
重新启动apache2后，错误仍然一样。
我的服务器不是内存不足，CPU 使用率也低（htop输出看起来相当不错）。
netstat另外，我在执行时得到了这些结果ps：
ubuntu@php-app1:~$ sudo netstat -pant | grep -c ESTABLISHED
18
ubuntu@php-app1:~$ ps -ef | grep -ic apache2
17
有什么需要帮助的吗？非常感谢您的耐心和支持。
答案1
日志和 shell 输出与生效的 apache 配置不一致。指令
MinSpareServers 30
这意味着每次至少会有 30 个 Apache 子进程运行，并且只要该数量大于需要生成的数量，就不会出现该错误消息。
确认正在编辑的配置文件实际上是 apache 正在使用的配置文件，例如尝试
httpd -t -D DUMP_INCLUDES
或者检查 -f 参数的使用，指定不同的父配置文件。