apache进程解析
1 查看apache进程# ps -ef|grep httpd
root 6593 10 12:55 ? 00:00:00 /usr/local/apache2/bin/httpd -k start
daemon 659465930 12:55 ? 00:00:00 /usr/local/apache2/bin/httpd -k start
daemon 659565930 12:55 ? 00:00:00 /usr/local/apache2/bin/httpd -k start
daemon 659665930 12:55 ? 00:00:00 /usr/local/apache2/bin/httpd -k start
daemon 659765930 12:55 ? 00:00:00 /usr/local/apache2/bin/httpd -k start
daemon 659865930 12:55 ? 00:00:00 /usr/local/apache2/bin/httpd -k start
root 660059380 12:55 pts/0 00:00:00 grep httpd 6593-－第一个为master进程，如果master进程被干掉，程序依旧可以运行，担如果链接数不够了，无法生成新的子进程，只能靠声誉的进程支持，而且非主进程的pid变成1
# ps -ef|grep httpd
daemon 6594 10 12:55 ? 00:00:00 /usr/local/apache2/bin/httpd -k start
daemon 6595 10 12:55 ? 00:00:00 /usr/local/apache2/bin/httpd -k start
daemon 6596 10 12:55 ? 00:00:00 /usr/local/apache2/bin/httpd -k start
daemon 6597 10 12:55 ? 00:00:00 /usr/local/apache2/bin/httpd -k start
daemon 6598 10 12:55 ? 00:00:00 /usr/local/apache2/bin/httpd -k start
root 676359380 12:59 pts/0 00:00:00 grep httpd 2问题：如果一个进程同时处理上万个链接，而且释放内存又很慢的话，这个进程就会吃掉所有的内存，系统会默认kill掉它
解决方法：加内存
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