不通过 web server 获取 php-fpm 运行状态
php-fpm 可以配置一个 pm.status_path ，如 `/status`，然后通过 web server 访问这个地址来获取运行状态。但这样会侵入 web server 的配置，在一个 web server 后端有多个 php-fpm 的适合也不方便分别监控每一个后端的状态，为了安全，还要配置访问控制。
好在有个现成的工具 cgi-fcgi，可以把 fcgi 请求包装成 cgi 方式，这样就可以直接在命令行中调用 fastcgi。
cgi-fcgi 在 redhat/centos 中可以用 `yum install fcgi` 安装，在 ubuntu 中可以用 `apt-get install libfcgi-dev` 安装。
用以下方式就能获取 php-fpm 的状态了。
path=/statusexport REQUEST_METHOD=GETexport SCRIPT_NAME="$path"export SCRIPT_FILENAME="$path"export QUERY_STRING=''# export QUERY_STRING='full'# export QUERY_STRING='json'# export QUERY_STRING='full&xml'addr=/var/run/php-fpm.socket# addr=127.0.0.1:9000cgi-fcgi -bind -connect "$addr"
QUERY_STRING 设置为 full 会显示每一个 worker 进程的状态。添加 json、xml、html 可以以不同格式显示结果。
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