I removed Apache by "yum remove httpd" before installing Nginx. But php-fpm processes are associated with Apache (instead of Nginx) as (as seen by top command)


1590 root 21 0 13624 2096 340 S 0.0 0.4 0:00.00 nginx
1592 nginx 15 0 13840 2984 992 S 0.0 0.6 0:00.40 nginx
3591 apache 16 0 21348 6172 3600 S 0.0 1.2 0:36.20 php-fpm
7200 apache 15 0 21604 6320 3620 S 0.0 1.2 0:35.27 php-fpm
9980 apache 16 0 21596 6124 3556 S 0.0 1.2 0:13.14 php-fpm
11382 apache 15 0 21540 6160 3536 S 0.0 1.2 0:04.33 php-fpm
11477 apache 15 0 21700 6224 3524 S 0.0 1.2 0:04.67 php-fpm
11484 apache 18 0 21584 6188 3508 S 0.0 1.2 0:04.80 php-fpm


Is it normal? why Apache is still alive in my server?