snmp_config man page on Oracle

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       snmp_config - handling of Net-SNMP configuration files

       The  Net-SNMP package uses various configuration files to configure its
       applications.  This manual page merely describes the overall nature  of
       them, so that the other manual pages don't have to.

       First  off,  there  are numerous places that configuration files can be
       found and read from.  By default, the applications look for  configura‐
       tion  files  in	the  following	4  directories,	 in  order: /etc/snmp,
       /usr/share/snmp, /usr/lib(64)/snmp, and $HOME/.snmp.  In each of	 these
       directories,   it   looks   for	 files	snmp.conf,  snmpd.conf	and/or
       snmptrapd.conf, as well	as  snmp.local.conf,  snmpd.local.conf	and/or
       snmptrapd.local.conf.  *.local.conf  are always read last. In this man‐
       ner, there are 8 default places a configuration file can exist for  any
       given configuration file type.

       Additionally,  the  above default search path can be overridden by set‐
       ting the environment variable SNMPCONFPATH to a colon-separated list of
       directories  to search for.  The path for the persistent data should be
       included when running applications that use persistent storage, such as

       Applications  will read persistent configuration files in the following
       order of preference:

	      file in SNMP_PERSISTENT_FILE environment variable
	      directories in SNMPCONFPATH environment variable
	      directory defined by persistentDir snmp.conf variable
	      directory in SNMP_PERSISTENT_DIR environment variable
	      default /var/lib/net-snmp directory

       Finally, applications will write persistent configuration files in  the
       following order of preference:

	      file in SNMP_PERSISTENT_FILE environment variable
	      directory defined by persistentDir snmp.conf variable
	      directory in SNMP_PERSISTENT_DIR environment variable
	      default /var/lib/net-snmp directory

       Note:   When  using SNMP_PERSISTENT_FILE, the filename should match the
       application name.  For example, /var/net-snmp/snmpd.conf.

       Each application may use multiple configuration files, which will  con‐
       figure various different aspects of the application.  For instance, the
       SNMP agent (snmpd) knows how to understand configuration directives  in
       both  the  snmpd.conf  and the snmp.conf files.	In fact, most applica‐
       tions understand how to read  the  contents  of	the  snmp.conf	files.
       Note, however, that configuration directives understood in one file may
       not be understood in another file.  For further information,  read  the
       associated  manual  page with each configuration file type.  Also, most
       of the applications support a -H switch on the command line  that  will
       list  the  configuration	 files	it will look for and the directives in
       each one that it understands.

       The snmp.conf configuration file is intended to be a application	 suite
       wide  configuration  file  that supports directives that are useful for
       controlling the fundamental nature of all  of  the  SNMP	 applications,
       such as how they all manipulate and parse the textual SNMP MIB files.

       It's  possible  to  switch  in mid-file the configuration type that the
       parser is supposed to be reading.  Since	 that  sentence	 doesn't  make
       much  sense,  lets  give you an example: say that you wanted to turn on
       packet dumping output for the agent by default, but you didn't want  to
       do  that for the rest of the applications (ie, snmpget, snmpwalk, ...).
       Normally to enable packet dumping in the configuration file you'd  need
       to put a line like:

	      dumpPacket true

       into  the  snmp.conf  file.   But, this would turn it on for all of the
       applications.  So, instead, you can put the same line in the snmpd.conf
       file so that it only applies to the snmpd daemon.  However, you need to
       tell the parser to expect this line.  You do this by putting a  special
       type  specification token inside a [] set.  In other words, inside your
       snmpd.conf file you could put the above snmp.conf directive by adding a
       line like so:

	      [snmp] dumpPacket true

       This  tells  the	 parser to parse the above line as if it were inside a
       snmp.conf file instead of an snmpd.conf file.  If you want to  parse  a
       bunch  of  lines	 rather	 than  just  one then you can make the context
       switch apply to the remainder of the file or  until  the	 next  context
       switch directive by putting the special token on a line by itself:

	      # make this file handle snmp.conf tokens:
	      dumpPacket true
	      logTimestamp true
	      # return to our original snmpd.conf tokens:
	      rocommunity mypublic

       The  same  approach  can	 be used to set configuration directives for a
       particular client application (or group of applications).  For example,
       any  program  that uses the 'snmp_parse_args()' call to handle command-
       line arguments (including the standard command-line  tools  shipped  as
       part  of the Net-SNMP distributions) will automatically read the config
       file 'snmpapp.conf'.  To set library-level settings for these  applica‐
       tions  (but  not	 other more-specific tools), use configuration such as
       the following:

	      [snmp] defCommunity myCommunity

       for a single directive, or

	      # make this file handle snmp.conf tokens:
	      defCommunity myCommunity
	      defVersion   2c
	      # return to our original snmpapp.conf tokens:

       for multiple settings.  Similarly for any other application  token  (as
       passed to init_snmp()).

       Any  lines  beginning with the character '#' in the configuration files
       are treated as a comment and are not parsed.

       It is possible to include other configuration files for processing dur‐
       ing normal configuration file processing.:

	      # include site specific config
	      include site.conf

       This will search every directory in the configuration path for files
       named site.conf, and will process those files before returning to the
       processing of the original file. Note that if '.conf' is omitted,
       it will be appended. That is, all configuration files must end
       in '.conf'.

       Information  about  writing  C  code  that  makes use of this system in
       either the agent's MIB modules or in applications can be found  in  the
       netsnmp_config_api(3) manual page.

       snmpconf(1), netsnmp_config_api(3), snmp.conf(5), snmpd.conf(5)

V5.7.2				  08 Mar 2010			SNMP_CONFIG(5)

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