If the -soft option is used, requests to reinstall the trigger nodes can time out. The failure to reinstall the trigger notes leaves no access to the next level of mounts. The only way to clear this problem is to have the automounter unmount all of the components in the hierarchy, either by waiting for the file systems to be automatically unmounted or by rebooting the system. This means any of the replicated locations can provide the same service to any user. This procedure makes sense only when you mount a file system that is read-only, as you must have some control over the locations of files you write or modify. The benefit is that the best available server is used automatically without any effort required by the user.
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External Links 1. Introduction autofs is a program for automatically mounting directories on an as-needed basis. Auto-mounts are mounted only as they are accessed, and are unmounted after a period of inactivity.
Quick note on terms To avoid confusion, the following terminologies will be used: automount is the program used to configure a mount point for autofs. When autofs is started, an automount daemon is spawned for each map. Auto-mount or auto-mounting refers to the process of automatically mounting filesystems. Configuration autofs can be configured by editing configuration files.
There are other ways to configure autofs on a network see AutofsLDAP , but config files provide the simplest setup. Unless you have a good reason for changing this, leave it as the default. Each of the lines in auto.
These lines have the following format: mount-point [map-type[,format]:] map [options] 3. Direct and Indirect Maps automount maps can be direct or indirect. Indirect maps, such as those in the auto. Direct maps create a mount-point at the path specified in the relevant map file. The mount-point entry in auto.
For example, the following line instructs autofs to create a mount-point at the place specified in auto. Map Files As indicated above, each autofs mount has its own map file. These files are usually named using the convention auto. Map files take the following format: key [-options] location 4. This howto assumes that you are already familiar with NFS exports, and that you already have a properly-functioning NFS share on your network. You have a functioning NFS mount via autofs!
If you want to learn some more advanced information, keep reading. But remember that you need to access a directory before it is auto-mounted. Once it has been accessed, your share will be listed only until it times out. If you have a lot of NFS or Samba shares, you may want to uncomment these lines. In an environment with NFS file servers, such a configuration can be useful. However, if you need to authenticate before accessing the Samba share, automount will not function.
You can also use variables see autofs 5 man page to substitute users and other parameters to be able to create generic file for multiple users. Mounting Other Types of Files Systems 6. The file-system location specifies the user-space binary used to mount the file system, followed by a hash , followed by the location.
The entire location must be preceded by a colon :. You should have already set-up password-less authentication via public key encryption. Be sure that you understand the security implications of this before proceeding.
Specify the user-name used to connect To test mounting your SSHFS file system as root issued the following: sudo sshfs user example. Debugging Auto Mount Problems If you are having trouble automounting your file systems, it may be useful to run automount in the foreground. Stop the autofs daemon Run automount in the foreground with verbose information sudo automount -f -v From another terminal, try to mount your file-systems by changing directories into the mountpoint.
Check the output from the first terminal for clues as to why the mount failed or was not attempted. See Also Mount - Information about the mounting process and its configuration in Ubuntu. External Links The mount man page - hosted on the official Ubuntu website.
21.2.2. Mounting NFS File Systems using autofs
Using AutoFS to automatically mount a file system AutoFS relies on the use of the automount command to propagate the automatic mount configuration information to the AutoFS kernel extension and start the automountd daemon. Through this configuration propagation, the extension automatically and transparently mounts file systems whenever a file or a directory within that file system is opened. The extension informs the automountd daemon of mount and unmount requests, and the automountd daemon actually performs the requested service. Because the name-to-location binding is dynamic within the automountd daemon, updates to a Network Information Service NIS map used by the automountd daemon are transparent to the user. Also, there is no need to premount shared file systems for applications that have hard-coded references to files and directories, nor is there a need to maintain records of which hosts must be mounted for particular applications. AutoFS allows file systems to be mounted as needed. With this method of mounting directories, all file systems do not need to be mounted all of the time; only those being used are mounted.
How To Install AutoFS on Linux
Prerequisites Before starting, it is important for you to have sudo privileges on your host. In AutoFS, you are mapping mount points with files which is called an indirect map or a mount point with a location or a device. In its default configuration, AutoFS will start by reading maps defined in the autofs. From there, it will start a thread for all the mount points defined in the map files defined in the master file. Starting a thread does not mean that the mount point is mounted when you first start AutoFS : it will only be mounted when it is accessed. By default, after five minutes of inactivity, AutoFS will dismount or unmount mount points that are not used anymore. Before trying to automount the NFS share, it is a good practice to try mounting it manually as well as verifying that you can contact the remote server.
How Autofs Works
Defaultwert: 5 Minuten. Default: -nonstrict. Im Wesentlichen bewirkt diese, dass auf gemounteten Netzwerk-Freigaben symbolischen Links nicht gefolgt wird. Es besteht aber keinerlei Notwendigkeit, diese zu benutzen; man kann sich genau so gut selbst mit Root-Rechten  eigene Map-Dateien anlegen. Eine Map-Datei kann auf verschiedene Arten angelegt werden. Ist in der Master-Map-Datei ein Mount-Verzeichnis angegeben, gilt die Angabe relativ zu diesem; andernfalls ist der komplette Pfad anzugeben. Die Angabe von Optionen darf auch ganz entfallen.