Red Hat Summit21.3.3. autofs Common Tasks
21.3.3.1. Overriding or augmenting site configuration files
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It can be useful to override site defaults for a specific mount point on a client system. For example, assuming that the automounter maps are stored in NIS and the
/etc/nsswitch.conf file has the following directive:
automount: files nis
automount: files nis
and the NIS
auto.master map file contains the following:
/home auto.home
/home auto.home
Also assume the NIS
auto.home map contains the following:
beth fileserver.example.com:/export/home/beth joe fileserver.example.com:/export/home/joe * fileserver.example.com:/export/home/&
beth fileserver.example.com:/export/home/beth
joe fileserver.example.com:/export/home/joe
* fileserver.example.com:/export/home/&
and the file map
/etc/auto.home does not exist.
For the above example, lets assume that the client system needs to mount home directories from a different server. In this case, the client will need to use the following
/etc/auto.master map:
/home /etc/auto.home2 +auto.master
/home /etc/auto.home2
+auto.master
And the
/etc/auto.home2 map contains the entry:
* labserver.example.com:/export/home/&
* labserver.example.com:/export/home/&
Because only the first occurrence of a mount point is processed,
/home will contain the contents of /etc/auto.home2 instead of the NIS auto.home map.
Alternatively, if you just want to augment the site-wide
auto.home map with a few entries, create a /etc/auto.home file map, and in it put your new entries and at the end, include the NIS auto.home map. Then the /etc/auto.home file map might look similar to:
mydir someserver:/export/mydir +auto.home
mydir someserver:/export/mydir
+auto.home
Given the NIS
auto.home map listed above, an ls of /home would now give:
ls /home
~]$ ls /home
beth joe mydir
This last example works as expected because
autofs knows not to include the contents of a file map of the same name as the one it is reading and so moves on to the next map source in the nsswitch configuration.
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