安装的系统为redhat5.1 + oracle10g 启动数据库的一个服务时一直报 Permission denied 错误
检查可能是统安全屏蔽了oracle执行某些执行动作。于是检查系统防火墙iptables，已经关闭，于是想到了Selinux
检查配置文件：
[root@localhost ~]# more /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=enforcing
# SELINUXTYPE= type of policy in use. Possible values are:
# targeted - Only targeted network daemons are protected.
# strict - Full SELinux protection.
SELINUXTYPE=targeted
[root@localhost ~]# vi /etc/sysconfig/selinux
果然selinux是开启的 关闭selinux
[root@localhost ~]# vi /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=disabled
# SELINUXTYPE= type of policy in use. Possible values are:
# targeted - Only targeted network daemons are protected.
# strict - Full SELinux protection.
SELINUXTYPE=targeted
修改SELINUX=disabled，然后重启系统才能生效，或者执行：setenforce 0，立即生效。
关闭selinux后，sqlplus可以正常登陆了。 服务也能正常启动了。