实际运用rsync练习中遇到rsync报错信息如：

rsync: failed to set times on "." (in backup): Permission denied (13)
rsync: recv_generator: failed to stat "ccc" (in backup): Permission denied (13)

翻译可知：更新.文件的时间失败：原因是权限不够。

此问题为权限问题，在文件权限无误：

参考文献，克制此处为selinux权限限制，临时更改为setenforce 0，永久更改为修改/etc/sysconfig/selinux,将SELINUX=enforcing修改为SELINUX=diabled或者SELINUX=permissive

# 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 - No SELinux policy is loaded.
SELINUX=enforcing
# SELINUXTYPE= can take one of these two values:
#     targeted - Targeted processes are protected,
#     mls - Multi Level Security protection.
SELINUXTYPE=targeted

重新同步，成功：

rsync报错rsync: failed to set times on "." (in backup): Permission denied (13)