Autofs controls the operation of the automount daemons. The automount daemons automatically mount filesystems when they are accessed and unmount them after a period of inactivity. This is done based on a set of pre-configured maps.
This package is known to build and work properly using an LFS 11.3 platform.
Download (HTTP): https://www.kernel.org/pub/linux/daemons/autofs/v5/autofs-5.1.8.tar.xz
Download MD5 sum: 72d81645d39a857c3d16bd3a32e9cb44
Download size: 320 KB
Estimated disk space required: 6.5 MB
Estimated build time: 0.1 SBU
libtirpc-1.3.3 and rpcsvc-proto-1.4.3
nfs-utils-2.6.2, libnsl-2.0.0, libxml2-2.10.3, MIT Kerberos V5-1.20.1, OpenLDAP-2.6.4 (client only), and Cyrus SASL-2.1.28
User Notes: https://wiki.linuxfromscratch.org/blfs/wiki/autofs
Verify that automounter kernel support has been enabled:
File systems --->
<*/M> Kernel automounter support (supports v3, v4, and v5) [CONFIG_AUTOFS_FS]
Optionally, enable the following options in the kernel configuration:
File systems --->
[*] Network File Systems ---> [CONFIG_NETWORK_FILESYSTEMS]
<*/M> NFS client support [CONFIG_NFS_FS]
<*/M> SMB3 and CIFS support (advanced network filesystem) [CONFIG_CIFS]
Recompile and install the new kernel, if necessary.
First fix an issue introduced by glibc-2.36:
grep -rl linux/fs modules | xargs sed -i "/linux\/fs/d"
Install Autofs by running the following commands:
./configure --prefix=/usr \ --with-mapdir=/etc/autofs \ --with-libtirpc \ --with-systemd \ --without-openldap \ --mandir=/usr/share/man && make
This package does not come with a test suite.
Now, as the root
user:
make install
If autofs is already installed on your system, be sure to backup your configuration files. They'll be overwritten by the following command.
Install the default configuration files, still as the root
user:
make install_samples
--with-libtirpc
: This
switch forces the package to use libtirpc for RPC functionality
instead of relying on implementation from Glibc, which was removed
in LFS 8.1.
--with-systemd
: This switch
enables installation of the bundled systemd units.
--without-openldap
: This
switch disables openldap if found. If openldap is desired, omit
this switch. Note that openldap support in autofs requires
MIT Kerberos V5-1.20.1.
/etc/sysconfig/autofs.conf
,
/etc/autofs/auto.master
,
/etc/autofs/auto.misc
, and
/etc/autofs/auto.net
The installation process creates auto.master
, auto.misc
, auto.smb
, and auto.net
. Replace the auto.master
file with the following commands as
the root
user:
mv /etc/autofs/auto.master /etc/autofs/auto.master.bak &&
cat > /etc/autofs/auto.master << "EOF"
# Begin /etc/autofs/auto.master
/media/auto /etc/autofs/auto.misc --ghost
#/home /etc/autofs/auto.home
# End /etc/autofs/auto.master
EOF
This file creates a new media directory, /media/auto
that will overlay any existing
directory of the same name. In this example, the file,
/etc/autofs/auto.misc
, has a line:
cd -fstype=iso9660,ro,nosuid,nodev :/dev/cdrom
that will mount a cdrom as /media/auto/cd
if that directory is accessed.
The --ghost
option tells the
automounter to create “ghost” versions (i.e. empty
directories) of all the mount points listed in the configuration
file regardless whether any of the file systems are actually
mounted or not. This is very convenient and highly recommended,
because it will show you the available auto-mountable file
systems as existing directories, even when their file systems
aren't currently mounted. Without the --ghost
option, you'll have to remember the names
of the directories. As soon as you try to access one of them, the
directory will be created and the file system will be mounted.
When the file system gets unmounted again, the directory is
destroyed too, unless the --ghost
option was given.
An alternative method would be to specify another automount
location such as /var/lib/auto/cdrom
and create a symbolic
link from /media/cdrom
to the
automount location.
The auto.misc
file must be
configured to your working hardware. The loaded configuration
file should load your cdrom if /dev/cdrom
is active or it can be edited to
match your device setup. Examples for floppies are available in
the file and easily activated. Documentation for this file is
available using the man 5
autofs command.
In the second line, if enabled, a user's home directory would be
mounted via NFS upon login. The /etc/home.auto
would need to exist and have an
entry similar to:
joe example.org:/export/home/joe
where the directory /export/home/joe
is exported via NFS from the
system example.org. NFS shares are covered on the next page.
This package could also be used to mount SMB shares, however that feature is not configured in these instructions. For additional configuration information, see the man pages for auto.master(5). There are also web resources such as this AUTOFS HOWTO available.
To start Autofs at boot, enable
the previously installed systemd unit by running the following
command as the root
user:
systemctl enable autofs
You can also specify OPTIONS
variable in the /etc/sysconfig/autofs
file with any
additional parameters that you might want to pass to the
automount daemon.