1, view the status of SELinux
sestatus
2, the temporary closure of SELinux
setenforce 0
3, open SELinux
setenforce 1
4, view the status of specific items, such as keywords ftp
# getsebool -a|grep ftp
5, modify the value of an item, e.g. ftpd_full_access
Setsebool ftpd_full_access # 1