1 <sect1 id="ch-bootable-fstab">
2 <title>Creating the /etc/fstab file</title>
3 <?dbhtml filename="fstab.html" dir="chapter08"?>
5 <para>The <filename>/etc/fstab</filename> file is used by some programs to
6 determine where partitions are to be mounted by default, which file systems
7 must be checked and in which order. Create a new file systems table like
10 <screen><userinput>cat > /etc/fstab << "EOF"</userinput>
13 # file system mount-point fs-type options dump fsck-order
15 /dev/xxx / fff defaults 1 1
16 /dev/yyy swap swap pri=1 0 0
17 proc /proc proc defaults 0 0
18 devpts /dev/pts devpts gid=4,mode=620 0 0
19 shm /dev/shm tmpfs defaults 0 0
22 <userinput>EOF</userinput></screen>
24 <para>Of course, replace <filename>xxx</filename>, <filename>yyy</filename>
25 and <filename>fff</filename> with the values appropriate for your system --
26 for example <filename>hda2</filename>, <filename>hda5</filename> and
27 <filename>reiserfs</filename>. For all the details on the six fields in this
28 table, see <command>man 5 fstab</command>.</para>
30 <para>When using a reiserfs partition, the <emphasis>1 1</emphasis> at the
31 end of the line should be replaced with <emphasis>0 0</emphasis>, as such a
32 partition does not need to be dumped or checked</para>
34 <para>The <filename>/dev/shm</filename> mount point for tmpfs is included to
35 allow enabling POSIX shared memory. Your kernel must have the required support
36 built into it for this to work -- more about this in the next section. Please
37 note that currently very little software actually uses POSIX shared memory.
38 Therefore you can consider the <filename>/dev/shm</filename> mount point
39 optional. For more information, see
40 <filename>Documentation/filesystems/tmpfs.txt</filename> in the kernel source
43 <para>There are other lines which you may consider adding to your
44 <filename>fstab</filename> file. One example is a line to use if you intend to
45 use USB devices:</para>
47 <screen>usbfs /proc/bus/usb usbfs defaults 0 0</screen>
49 <para>This option will of course only work if you have the relevant support
50 compiled into your kernel.</para>