Because the NFS protocol supports Unix file permissions and file ownership information, if users can login to both your system and the remote fileserver, any files that they own on one machine should be owned on the other.
However, this depends on every user having the same user ID on both servers. If this is not the case, you may end up in a situation in which user jcameron owns a file on the fileserver, but when it is mounted and accessed on your system the file appears to be owned by user fred. The best solution to this problem is to make sure that user IDs are in sync across all servers that share files using NFS. If you have files on a Windows system that you want to access on your Linux system, you must first share the directory and assign it a share name using the Windows user interface.
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Windows networking filesystems can also be exported by Unix servers using Samba, as explained in Samba Windows File Sharing. However, as you might guess this is not usually a good idea as file permissions and ownership information will not be available on the mounting server. Before you can mount a new filesystem from a local hard disk, a partition must have been prepared and formatted with the corrected filesystem type. For details on how to do this, see chapter 8.
If you have a choice, ext3 called the New Linux Native Filesystem by Webmin should be used instead of ext2 the Linux Native Filesystem because its support for journaling.
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See the section on "A comparison of filesystem types" for more details on the advantages of ext3. If your system has a Windows partition on one of its hard disks, you can mount it using Webmin so that all the files are easily accessible to Unix users and programs. Windows 95, 98 and ME all use the older vfat format by default, called a Windows 95 filesystem by Webmin. Because Windows 95 filesystems have no concept of file ownership and Windows NT filesystems have ownership information that is unsupported by Linux, it is impossible to change the user, group or permissions on files in a mounted filesystem.
As explained in the introduction, virtual memory is used when the processes running on your system need to use more memory than is physically installed. Because not all processes run at the same time, those that are inactive can be safely swapped out to virtual memory and then swapped back in again when they need to run. However, because disks are far slower than RAM, if processes on your system use up too much memory the constant swapping in and out known as thrashing will slow the system to a crawl.
Using the Mac OS X automounter
Both files in an existing local filesystem and entire partitions can be used for virtual memory. Using a partition is almost always faster, but can be inflexible if you have no free partitions on your hard disk. A system can have more than one virtual memory file or partition, so if you are running out of virtual memory it is easy to add more.
When using Linux, before you can access files on any filesystem it must first be explicitly mounted. This is fine for hard disks that are mounted at boot time, but is not so convenient for removable media like CD-ROMs, floppy disks and Zip disks. Having to mount a floppy before you can read or write files on it, and then un-mount it when done is not very user friendly, especially compared to other operating systems like Windows. Fortunately, there is a solution - the automounter filesystem. This does not contain any files of its own, but automatically creates temporary directories and mounts filesystems when needed.
When the floppy's filesystem is no longer being used, it will be automatically un-mounted so that the floppy can be safely ejected. Automounter filesystems can be created, viewed and edited in Webmin. Each has a configuration file that specifies which devices it will mount and which subdirectories they will be mounted on. The editing of these configuration files cannot be done within Webmin though - you can only choose which one to use. Another common use for the automounter is to provide easy access to NFS servers. This is all done using another automounter configuration file.
After mounting a filesystem, you can go back and change the mount directory, source and options at any time. Even most filesystems that were set up as part of your operating system's installation process can be edited. However, some special filesystem types like proc and devfs cannot be editing though Webmin, as changing them would probably break your system.
The only catch is that filesystems that are currently in use cannot be immediately edited. If any user or process is accessing any file or is in any directory on a filesystem, it is considered busy and cannot be un-mounted and re-mounted by Webmin in order to change it. Because the root filesystem is always in use, making immediate changes to it is impossible. Fortunately, there is an alternative - changing only the permanent record of a filesystem, so that when your system reboots the new options are applied. To totally remove a filesystem, just edit it and set the "Save Mount?
Assuming it is not in use, it will be un-mounted and removed from the list of recorded filesystems, and so will no longer show up in the list on the module's main page. If you cannot un-mount or edit a filesystem because it is busy, you may want to kill the processes that are currently using it. To find which processes are using a filesystem, follow these steps:. A Webmin user can be given limited access to this module, so that he can only edit the settings for certain filesystems or only mount and un-mount.
Allowing an un-trusted users to mount any filesystem is a bad idea, because he could gain complete control of your system by mounting an NFS or floppy-disk filesystem containing setuid-root programs. However, giving someone the rights to only mount and un-mount certain filesystems that have their options set to prevent the use of setuid programs is quite safe. On Linux systems, the Allow users to mount this filesystem? Other tools like the Gnome mount panel applet and Usermin also make use of this feature, which may be a better way to give normal users mount and un-mount privileges.
[SOLVED] Resetting Mount Point.
Like other modules, this one has a few options that you can change. To see them, click on the Module Config link in the top-left corner of the main page. This will take you to the standard configuration editing page, on which the following options are available under the Configurable options header:. None of the other options on the configuration page should be changed, as they are set automatically by Webmin based on your operating system type. Unlike other operating systems, Linux supports several different types of filesystems that fully support Unix file permissions and ownership information.
Originally the ext2 called the Linux Native Filesystem by Webmin was the only choice, but newer kernel versions and distributions have added support for ext3, ext4, reiserfs and xfs. This section explains the benefits of each of these alternative filesystem types.
Applying Your Linux Skills to macOS: Terminal BASH and Common Commands
However these are filesystems that I do not generally want to see on the desktop and which sometimes are not even reachable. A better approach in this case is to use the automount service that is part of Mac OS X. A few very simple configuration steps will allow the automount service to automatically manage access to a remote filesystem mounting it only when it is accessed and unmounting it later when it is no longer being used.
To get started you need to create a local directory that will be managed by the automount service. All remote filesystems will appear under this directory which acts as a trigger to the automount service. You will need to use sudo to create the directory:. Also we will assume the filesystem is formatted as a Microsoft Windows SMB filesystem as it is also accessed by Windows devices true in my case.
Any time you modify the map files you need to inform the automount service in order for them to become active:. The only option that you are likely to ever want to change is the timeout period.
Re: Resetting Mount Point.
This is time that the automount service will wait before unmounting a filesystem that has not been accessed. It should be noted that filesystems that are automounted in this way will not show up automatically in the sidebar of the OS X Finder application. Nor will they automatically appear as disk icons on the desktop.
If that is important you may want to simply add the share as a login item and have it mounted whenever you login. For filesystems that are accessed by scripts or applications I prefer having them automatically mounted and unmounted in the background on demand.