我试图将一个 rails 应用程序部署到 中/home/app/myapp，但是当应用程序尝试连接到 Mysql 时，我收到此错误：
** [out :: 192.168.110.50] /home/app/myapp/shared/bundle/ruby/1.9.1/gems/mysql2-0.3.11/lib/mysql2/mysql2.so: failed to map segment from shared object: Operation not permitted - /home/app/myapp/shared/bundle/ruby/1.9.1/gems/mysql2-0.3.11/lib/mysql2/mysql2.so
'app' 用户有 root 权限，所以没有意义。
谷歌搜索后，我发现noexec在主文件夹中可以阻止系统调用。这是我的 fstab 文件：
$cat /etc/fstab
#
# /etc/fstab
# Created by anaconda on Wed Oct 17 16:48:10 2012
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/VG00-LVbarra / ext4 defaults 1 1
UUID=3d5ccda7-932f-4b48-a010-9ddcb99873c0 /boot …