Drupal files folder owner/group for CentOS?
I faced with this issue before, it was because of SELinux on CentOS, So you should try to Disable SELinux on Centos


  From the command line, you can edit the /etc/sysconfig/selinux file.
  This file is a symlink to /etc/selinux/config. The configuration file
  is self-explanatory. Changing the value of SELINUX or SELINUXTYPE
  changes the state of SELinux and the name of the policy to be used the
  next time the system boots.


[root@host2a ~]# cat /etc/sysconfig/selinux
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
#       enforcing - SELinux security policy is enforced.
#       permissive - SELinux prints warnings instead of enforcing.
#       disabled - SELinux is fully disabled.
SELINUX=permissive
# SELINUXTYPE= type of policy in use. Possible values are:
#       targeted - Only targeted network daemons are protected.
#       strict - Full SELinux protection.
SELINUXTYPE=targeted

# SETLOCALDEFS= Check local definition changes
SETLOCALDEFS=0


Change it from SELINUX=permissive to SELINUX=disabled

Once you have saved the changes sudo shutdown -r now to restart now.



Also you can disable it temporary ( until next restarting ) with

sudo setenforce 0


How to Disable SELinux