特殊:Badtitle/NS100:Fstab:修订间差异
小无编辑摘要 |
小无编辑摘要 |
||
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</li><li>Users may mount a device/partition if the device is in fstab with the proper options.</li></ol> | </li><li>Users may mount a device/partition if the device is in fstab with the proper options.</li></ol> | ||
{{https://help.ubuntu.com/community/IconsPage?action=AttachFile&do=get&target=IconSambaShares.png%7D%7D For usage with network shares, see [[SettingUpNFSHowTo]] , [[SettingUpSamba]] and | {{https://help.ubuntu.com/community/IconsPage?action=AttachFile&do=get&target=IconSambaShares.png%7D%7D For usage with network shares, see [[UbuntuHelp:SettingUpNFSHowTo]] , [[UbuntuHelp:SettingUpSamba]] and [http://www.debuntu.org/2006/04/27/39-mounting-a-fuse-filesystem-form-etcfstab SSHFS]. | ||
== Fstab File Configuration == | == Fstab File Configuration == | ||
{{https://help.ubuntu.com/community/IconsPage?action=AttachFile&do=get&target=info.png%7D%7D The syntax of a fstab entry is : | {{https://help.ubuntu.com/community/IconsPage?action=AttachFile&do=get&target=info.png%7D%7D The syntax of a fstab entry is : | ||
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| || The directory on your root file system (aka mount point) from which it will be possible to access the content of the device/partition (note: swap has no mount point). Mount points should not have spaces in the names. | | || The directory on your root file system (aka mount point) from which it will be possible to access the content of the device/partition (note: swap has no mount point). Mount points should not have spaces in the names. | ||
|- | |- | ||
| || Type of file system (see [[LinuxFilesystemsExplained]]). | | || Type of file system (see [[UbuntuHelp:LinuxFilesystemsExplained]]). | ||
|- | |- | ||
| || Mount options of access to the device/partition (see the man page for <code><nowiki>mount</nowiki></code>). | | || Mount options of access to the device/partition (see the man page for <code><nowiki>mount</nowiki></code>). | ||
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Please refer to the examples section for sample entries. We have provided you some detailed explanations of each field: | Please refer to the examples section for sample entries. We have provided you some detailed explanations of each field: | ||
=== Device === | === Device === | ||
By default, Ubuntu now uses | By default, Ubuntu now uses [http://en.wikipedia.org/wiki/UUID UUID] to identify partitions. | ||
UUID=xxx.yyy.zzz | UUID=xxx.yyy.zzz | ||
To list your devices by UUID use blkid | To list your devices by UUID use blkid | ||
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* _netdev - this is a network device, mount it after bringing up the network. Only valid with fstype nfs. | * _netdev - this is a network device, mount it after bringing up the network. Only valid with fstype nfs. | ||
For specific options with specific file systems see: | For specific options with specific file systems see: | ||
[http://linux.die.net/man/8/mount man mount] | |||
=== Dump === | === Dump === | ||
This field sets whether the backup utility dump will backup file system. If set to "0" file system ignored, "1" file system is backed up. | This field sets whether the backup utility dump will backup file system. If set to "0" file system ignored, "1" file system is backed up. | ||
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== Other Resources == | == Other Resources == | ||
{{https://help.ubuntu.com/community/IconsPage?action=AttachFile&do=get&target=IconBook-small.png%7D%7D Here are some more links for your convenience: | {{https://help.ubuntu.com/community/IconsPage?action=AttachFile&do=get&target=IconBook-small.png%7D%7D Here are some more links for your convenience: | ||
* [[UsingUUID|UUID]] | * [[UbuntuHelp:UsingUUID|UUID]] | ||
* | * [http://ubuntuforums.org/showthread.php?t=283131 How to fstab] (from the Ubuntu Forums) | ||
* http://en.wikipedia.org/wiki/Fstab | * http://en.wikipedia.org/wiki/Fstab | ||
* [[SettingUpNFSHowTo]] | * [[UbuntuHelp:SettingUpNFSHowTo]] | ||
* [[SettingUpSamba]] | * [[UbuntuHelp:SettingUpSamba]] | ||
* [[LinuxFilesystemsExplained]] | * [[UbuntuHelp:LinuxFilesystemsExplained]] | ||
* [[AutomaticallyMountPartitions]] | * [[UbuntuHelp:AutomaticallyMountPartitions]] | ||
* [[HowtoPartition]] | * [[UbuntuHelp:HowtoPartition]] | ||
---- | ---- | ||
* [[/PageDiscussion|Discus this page]] | * [[UbuntuHelp:/PageDiscussion|Discus this page]] | ||
* [[category:CategoryDocumentation]] | * [[category:CategoryDocumentation]] | ||
[[category:UbuntuHelp]] | [[category:UbuntuHelp]] |
2008年10月19日 (日) 15:15的版本
文章出处: |
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{{#ifeq:UbuntuHelp:Fstab|:Fstab|请不要直接编辑翻译本页,本页将定期与来源同步。}} |
{{#ifexist: :Fstab/zh | | {{#ifexist: Fstab/zh | | {{#ifeq: {{#titleparts:Fstab|1|-1|}} | zh | | }} }} }} {{#ifeq: {{#titleparts:Fstab|1|-1|}} | zh | | }}
Introduction to fstab
{{https://help.ubuntu.com/community/IconsPage?action=AttachFile&do=get&target=IconDisks.png%7D%7D The configuration file /etc/fstab
contains the necessary information to automate the process of mounting partitions. In a nutshell, mounting is the process where a raw (physical) partition is prepared for access and assigned a location on the file system tree (or mount point).
- In general fstab is used for internal devices, CD/DVD devices, and network shares (samba/nfs/sshfs). Removable devices such as flash drives *can* be added to fstab, but are typically mounted by gnome-volume-manager and are beyond the scope of this document.
- Options for mount and fstab are similar.
- Partitions listed in fstab can be configured to automatically mount during the boot process.
- If a device/partition is not listed in fstab ONLY ROOT may mount the device/partition.
- Users may mount a device/partition if the device is in fstab with the proper options.
{{https://help.ubuntu.com/community/IconsPage?action=AttachFile&do=get&target=IconSambaShares.png%7D%7D For usage with network shares, see UbuntuHelp:SettingUpNFSHowTo , UbuntuHelp:SettingUpSamba and SSHFS.
Fstab File Configuration
{{https://help.ubuntu.com/community/IconsPage?action=AttachFile&do=get&target=info.png%7D%7D The syntax of a fstab entry is :
[Device] [Mount Point] [File System Type] [Options] [Dump] [Pass]
fields | description |
The device/partition (by /dev location or UUID) that contain a file system. | |
The directory on your root file system (aka mount point) from which it will be possible to access the content of the device/partition (note: swap has no mount point). Mount points should not have spaces in the names. | |
Type of file system (see UbuntuHelp:LinuxFilesystemsExplained). | |
Mount options of access to the device/partition (see the man page for mount ).
| |
Enable or disable backing up of the device/partition (the command dump). This field is usually set to 0, which disables it. | |
Controls the order in which fsck checks the device/partition for errors at boot time. The root device should be 1. Other partitions should be 2, or 0 to disable checking. |
Please refer to the examples section for sample entries. We have provided you some detailed explanations of each field:
Device
By default, Ubuntu now uses UUID to identify partitions. UUID=xxx.yyy.zzz To list your devices by UUID use blkid
sudo blkid
Alternately syntax to refer to partitions :
- Device : /dev/sdxy
- Label : LABEL=label
- Network ID
- Samba : //server/share
- NFS : server:/share
- SSHFS : sshfs#user@server:/share
Mount point
A mount point is a location on your directory tree to mount the partition. The default location is /media although you may use alternate locations such as /mnt or your home directory. You may user any name you wish for the mount point , but you must create the mount point before you mount the partition. For example : /media/windows
sudo mkdir /media/windows
File System Type
You may either use auto or specify a file system. Auto will attempt to automagically detect the file system of the target file system and in general works well. In general auto is used for removable devices and a specific file system or network protocol for network shares. Examples:
- auto
- vfat - used for FAT partitions.
- ntfs - used for ro access to ntfs partitions.
- ntfs-3g - users for rw access to ntfs partitions.
- ext2, ext3, jfs, reiserfs, etc.
- udf,iso9660 - for CD/DVD.
- swap.
Options
Options are dependent on the file system. You may use "defaults" here and some typical options may include :
- Ubuntu 8.04 now uses relatime as default for linux native file systems. You can find a discussion of relatime here : http://lwn.net/Articles/244829/
- defaults = rw, suid, dev, exec, auto, nouser, and async.
- /home = The options for a separate home partition should be nodev,nosuid
- ntfs/vfat = permissions are set at the time of mounting the partition with umask, dmask, and fmask and can not be changed with commands such as chown or chmod.
- I advise
dmask=027,fmask=137
(if you user umask=000 all your files will be executable). More permissive options would bedmask=000,fmask=111
. - For mounting samba shares you can specify a username and password, or better a credentials file. The credentials file contains should be owned by root.root with permissions = 0400 .
Common options :
- sync/async - All I/O to the file system should be done (a)synchronously.
- auto - The filesystem can be mounted automatically (at bootup, or when mount is passed the -a option). This is really unnecessary as this is the default action of mount -a anyway.
- noauto - The filesystem will NOT be automatically mounted at startup, or when mount passed -a. You must explicitly mount the filesystem.
- dev/nodev - Interpret/Do not interpret character or block special devices on the file system.
- exec / noexec - Permit/Prevent the execution of binaries from the filesystem.
- suid/nosuid - Permit/Block the operation of suid, and sgid bits.
- ro - Mount read-only.
- rw - Mount read-write.
- user - Permit any user to mount the filesystem. This automatically implies noexec, nosuid,nodev unless overridden.
- nouser - Only permit root to mount the filesystem. This is also a default setting.
- defaults - Use default settings. Equivalent to rw, suid, dev, exec, auto, nouser, async.
- _netdev - this is a network device, mount it after bringing up the network. Only valid with fstype nfs.
For specific options with specific file systems see: man mount
Dump
This field sets whether the backup utility dump will backup file system. If set to "0" file system ignored, "1" file system is backed up. Dump is seldom used and if in doubt use 0.
Pass (fsck order)
Fsck order is to tell fsck what order to check the file systems, if set to "0" file system is ignored. Often a source of confusion, there are only 3 options :
- 0 == do not check.
- 1 == check this partition first.
- 2 == check this partition(s) next
In practice, use "1" for your root partition, / and 2 for the rest. All partitions marked with a "2" are checked in sequence and you do not need to specify an order. Use "0" to disable checking the file system at boot or for network shares. You may also "tune" or set the frequency of file checks (default is every 30 mounts) but in general these checks are designed to maintain the integrity of your file system and thus you should strongly consider keeping the default settings.
Examples
{{https://help.ubuntu.com/community/IconsPage?action=AttachFile&do=get&target=IconEnvelope.png%7D%7D The contents of the file will look similar to following:
# /etc/fstab: static file system information. # # <file system> <mount point> <type> <options> <dump> <pass> proc /proc proc defaults 0 0 # /dev/sda5 UUID=be35a709-c787-4198-a903-d5fdc80ab2f8 / ext3 relatime,errors=remount-ro 0 1 # /dev/sda6 UUID=cee15eca-5b2e-48ad-9735-eae5ac14bc90 none swap sw 0 0 /dev/scd0 /media/cdrom0 udf,iso9660 user,noauto,exec,utf8 0 0
NOTE: These network share examples (samba, nfs, and sshfs) assume you have already set up the appropriate server.
# FAT ~ Linux calls FAT file systems vfat) # /dev/hda1 UUID=12102C02102CEB83 /media/windows ntfs-3g auto,users,uid=1000,gid=100,dmask=027,fmask=137,utf8 0 0 # NTFS ~ Use ntfs-3g for write access (rw) # /dev/hda1 UUID=12102C02102CEB83 /media/windows ntfs-3g auto,users,uid=1000,gid=100,dmask=027,fmask=137,utf8 0 0 # Zip Drives ~ Linux recognizes ZIP drives as sdx'''4''' # Separate Home # /dev/sda7 UUID=413eee0c-61ff-4cb7-a299-89d12b075093 /home ext3 nodev,nosuid,relatime 0 2 # Data partition # /dev/sda8 UUID=3f8c5321-7181-40b3-a867-9c04a6cd5f2f /media/data ext3 relatime,noexec 0 2 # Samba //server/share /media/samba cifs user=user,uid=1000,gid=100 0 0 # "Server" = Samba server (by IP or name if you have an entry for the server in your hosts file # "share" = name of the shared directory # "user" = your samba user # This set up will ask for a password when mounting the samba share. If you do not want to enter a password, use a credentials file. # replace "user=user" with "credentials=/etc/samba/credentials" In the credentials file put two lines # user=user # password=password # make the file owned by root and ro by root (sudo chown root.root /etc/samba/credentials && sudo chmod 400 /etc/samba/credentials) # NFS Server:/share /media/nfs nfs rsize=8192 and wsize=8192,noexec,nosuid # "Server" = Samba server (by IP or name if you have an entry for the server in your hosts file # "share" = name of the shared directory #SSHFS sshfs#user@server:/share fuse user,allow_other 0 0 # "Server" = Samba server (by IP or name if you have an entry for the server in your hosts file # "share" = name of the shared directory
File System Specific Examples
{{https://help.ubuntu.com/community/IconsPage?action=AttachFile&do=get&target=example.png%7D%7D Here are a couple of basic examples for different file system types. I will use /dev/sdb1 or /dev/hda2 for simplicity, but remember that any /dev location, UUID=<some_id>, or LABEL=<some_label> can work.
ext2 and ext3
The main difference between ext2 and ext3 is that ext3 has journaling which helps protect it from errors when the system crashes. A root filesystem:
UUID=30fcb748-ad1e-4228-af2f-951e8e7b56df / ext3 defaults,errors=remount-ro,noatime 0 1
A non-root file system, ext2:
/dev/sdb1 /media/disk2 ext2 defaults 0 2
fat16 and fat32
/dev/hda2 /media/data1 vfat defaults,user,exec,uid=1000,gid=100,umask=000 0 0
/dev/sdb1 /media/data2 vfat defaults,user,dmask=027,fmask=137 0 0
ntfs
This example is perfect for a Windows partition.
/dev/hda2 /media/windows ntfs-3g defaults,locale=en_US.utf8 0 0
For a list of locales available on your system, run
locale -a
hfs+
the hfs+ filesystem is generally used by Apple computers.
/dev/sdb1 /media/Macintosh_HD hfsplus rw,exec,auto,users 0 0
Editing fstab
{{https://help.ubuntu.com/community/IconsPage?action=AttachFile&do=get&target=PicDocs.png%7D%7D Please, before you edit system files, make a backup. The -B flag with nano will make a backup automatically. To edit the file in Ubuntu, run:
gksu gedit /etc/fstab
To edit the file in Kubuntu, run:
kdesu kate /etc/fstab
To edit the file directly in terminal, run:
sudo nano -Bw /etc/fstab
- -B = Backup origional fstab to /etc/fstab~ .
- -w = disable wrap of long lines.
Alternate:
sudo -e /etc/fstab
Useful Commands
{{https://help.ubuntu.com/community/IconsPage?action=AttachFile&do=get&target=IconGNOMETerminal.png%7D%7D To view the contents of /etc/fstab
, run the following terminal command:
cat /etc/fstab
To get a list of all the UUIDs, use one of the following two commands:
sudo blkid ls -l /dev/disk/by-uuid
To list the drives and relevant partitions that are attached to your system, run:
sudo fdisk -l
To mount all file systems in /etc/fstab
, run:
sudo mount -a
Remember that the mount point must already exist, otherwise the entry will not mount on the filesystem. To create a new mount point, use root privileges to create the mount point. Here is the generalization and an example:
sudo mkdir /path/to/mountpoint sudo mkdir /media/disk2
Other Resources
{{https://help.ubuntu.com/community/IconsPage?action=AttachFile&do=get&target=IconBook-small.png%7D%7D Here are some more links for your convenience:
- UUID
- How to fstab (from the Ubuntu Forums)
- http://en.wikipedia.org/wiki/Fstab
- UbuntuHelp:SettingUpNFSHowTo
- UbuntuHelp:SettingUpSamba
- UbuntuHelp:LinuxFilesystemsExplained
- UbuntuHelp:AutomaticallyMountPartitions
- UbuntuHelp:HowtoPartition