strace 调试 php-fpm进程

1，安装strace

sudo apt-get install strace

2，查看php-fpm进程

vagrant@vagrant-ubuntu-precise-64:~$ ps -ef | grep php-fpm
root      2105     1  0 04:02 ?        00:00:02 php-fpm: master process (/etc/php5/fpm/php-fpm.conf)                    
www-data  2113  2105  0 04:02 ?        00:00:02 php-fpm: pool www                                                       
www-data 18481  2105  0 07:05 ?        00:00:01 php-fpm: pool www                                                       
www-data 18513  2105  0 07:06 ?        00:00:03 php-fpm: pool www                                                       
vagrant  19312  6379  0 10:14 pts/4    00:00:00 grep --color=auto php-fpm

3，调试进程输出日志到文件

vagrant@vagrant-ubuntu-precise-64:~$ sudo strace -f -p 2105 -e trace=file -o /temp/trace.log
Process 2105 attached - interrupt to quit
Process 19349 attached
Process 19350 attached

4，查看日志文件

tail -f /temp/trace.log