Sun-style Automounter Syntax Support in Amd Last updated: October 10, 2005 * Summary The goal of this effort is to provide a drop in replacement for the Sun automounter. This is implemented in two ways. (1) A new parser built into Amd. (2) a standalone sun2amd Unix filter tool that can convert Sun-style maps to Amd maps. Support for Sun-style maps in Amd (including this document) is a work-in-progress. This feature as a whole has not been throughly tested and is "alpha" quality as of the date posted at the top of this document. * Status Currently sun2amd supports most of the basic syntax features of Sun maps. However, support for Sun auto.master maps does not yet exists at any level. Below is a list of supported and not-yet supported features. 1. Supported Sun map features: - Simple map entry format: [mount_options] location ... locations take the form of host:pathname - Map Key Substitution: :/tmp/& the & expands to - Wildcard Key: * :/tmp This is is a catch-all entry. - Variable Substitution: $ARCH, $CPU, $HOST, $OSNAME, $OSREL, $OSVERS, $NATISA - Multiple Mount format: [mount_options] [mountpoint] [mount-options locations...]... ex. pluto -ro /tmp1 host1:/tmp1 /tmp2 host2:/tmp2 - HSFS file-system (cdrom): -fstype=hsfs,ro :/dev/cdrom 2. Not-yet supported Sun map features: - Replicated File Systems: ,...: This is a feature of Solaris that allows a user to specify a set of hosts to appear as one in a map entry. When a host does not respond the kernel will switch to an alternate server. Amd will supports the syntax for replicated file systems by creating multiple hosts, however, Amd will not perform any kind of fail over. - CacheFS (although Amd supports type:=cachefs, sun2amd doesn't yet parse it). - AutoFS (although Amd supports Autofs mounts and type:=auto, sun2amd may not parse it fully). - Included maps: + This will include the contents of a map into another map. - Sun master maps: auto.master Amd still relies and amd.conf. Any feature in auto.master must be duplicated using Amd equivalent features in amd.conf. - /net mount point: The automounter is suppose to dynamically create map entries under this mount point corresponding to NFS server(s) exported file systems. While this isn't parser by sun2amd, Amd does support host maps (type:=host). - Federated Naming Service (FNS) (-xfn): A naming server that wraps a number of other naming service under one interface. - "-null" map option: A way to cancel maps in the auto.master file. - nsswitch.conf: This file provides a way to specify what lookup service to use for a number of systems including Sun's automounter. In amd lookup services for map files are define in the amd.conf file. * Setup To enable Sun-style maps in Amd, set "sun_map_syntax = yes" in your amd.conf file. When this flag is set in [global], all maps read by Amd are assumed to be Sun style maps. You can set this on a per map basis, thus mixing Sun-style and Amd-style maps. For more information about amd.conf please see the Amd documentation. Example: # file: amd.conf ################ [ global ] sun_map_syntax = yes [ /home ] map_name = /etc/amd.sun_map map_type = file * sun2amd command line utility In addition to build-in Amd support there also exists the sun2amd command line utility that converts Sun maps to Amd maps. This can be useful in migrating one or more Sun maps to the Amd syntax in one step. Example usage: $ sun2amd -i sun_map -o amd_map This line tells sun2amd to read the file sun_map and redirect its output to a file called amd_map. By default sun2amd reads from stdin and writes to stdout (i.e., traditional Unix filter). * FAQ Q1: I know "/net" is not supported, but how can I achieve the same functionality with Amd? A1: In short, you must create the '/net' entry as a Amd entry of type host by hand. Below is an example of how to do this. See the Amd documentation on type autofs for more information. Example: # file: amd.conf ################ [ /net ] map_name = /etc/amd.net # file: /etc/amd.net ############### /defaults fs:=${autodir}/${rhost}/root/${rfs} * rhost:=${key};type:=host;rfs:=/ (more FAQ entries to come...)