Difference: Automount (4 vs. 5)

Revision 52015-09-29 - WilliamSeligman

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META TOPICPARENT	name="LinuxCluster"

Nevis Linux Cluster - Automount

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IMPORTANT

If you refer to any path that begins with the text /.automount, you are automatically doing something wrong. If you write to a systems administrator and include such a directory path in your question, you will be sent to read this page without further comment. Correct automount paths always begin with /a not /.automount; use of the latter guarantees that your task will fail.

The naming scheme for automount directories

This section is first because I assume most users at Nevis know what

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/dev/hda5 486M 190M 271M 41% / /dev/hda6 2.7G 1014M 1.6G 38% /home /dev/hda7 972M 849M 72M 92% /usr

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< franklin:/mail/inbox 4.1G 3.1G 1.0G 76% /.automount/a/franklin/mail/inbox karthur:/usr/local 17G 11G 5.0G 69% /.automount/a/karthur/usr/nevis

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> benjamin:/mail/inbox 4.1G 3.1G 1.0G 76% /a/mail/inbox library:/usr/nevis 17G 11G 5.0G 69% /a/apps/local

The first three filesystems are partitions on my system. The last two are directories on remote computer systems that have been mounted on tanya by automount:

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franklin:/mail/inbox was mounted when my mail program accessed the file /a/mail/inbox/seligman. The directory /a/mail/inbox is monitored by automount; when I accessed a file in that directory, a directory on the mail was mounted on my computer.

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benjamin:/mail/inbox was mounted when my mail program accessed the file /a/mail/inbox/seligman. The directory /a/mail/inbox is monitored by automount; when I accessed a file in that directory, a directory on the mail server was mounted on my computer.

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karthur:/usr/nevis was mounted when my system searched the directory /usr/nevis for programs. If you're running on a system in the Linux cluster, the directory defined in ${NevisAppBase} is linked via automount to a directory on the applications server:

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library:/usr/nevis was mounted when my system searched the directory /usr/nevis for programs. If you're running on a system in the Linux cluster, the directory defined in ${NevisAppBase} is linked via automount to a directory on the applications server:

# ls -ld ${NevisAppBase}

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You'll notice that the directory under which the remote system is mounted is /.automount. This is an automount convention; you should leave this directory alone (see the warning above). If you list the name of a directory that automount monitors, you can see the link:

# ls -ld /a/mail/inbox
lrwxrwxrwx    1 root   root  34 Jul 12 11:35 /a/mail/inbox -> /.automount/a/franklin/mail/inbox

When you do your work, you can ignore all these links. Just access a directory using the automount naming scheme and let the system take care of the links for you.

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