rump_server(1) - NetBSD Manual Pages

RUMP_SERVER(1)          NetBSD General Commands Manual          RUMP_SERVER(1)


NAME

     rump_server, rump_allserver -- rump kernel server


SYNOPSIS

     rump_server [-s] [-c ncpu] [-d drivespec] [-l library] [-m module] url


DESCRIPTION

     The rump_server utility is used to provide a rump kernel service.
     Clients can use the system calls provided by rump_server via url.

     The difference between rump_server and rump_allserver is that rump_server
     offers only a minimalistic set of features, while rump_allserver provides
     all rump kernel components which were available when the system was
     built.  At execution time it is possible to load components from the com-
     mand line as described in the options section.

     -c ncpu
             Configure ncpu virtual CPUs on SMP-capable archs.  By default,
             the number of CPUs equals the number of CPUs on the host.

     -d drivespec
             The argument drivespec maps a host file in the rump fs namespace.
             The string drivespec must be of comma-separated ``name=value''
             format and must contain the following tokens:

             key           Block device path in rump namespace.  This must be
                           specified according to the rules for a key in
                           rump_etfs(3).

             hostpath      Host file used for storage.  If the file does not
                           exist, it will be created.

             size          Size of the mapping.  Similar to dd(1), this argu-
                           ment accepts a suffix as the multiplier for the
                           number.  The special value ``host'' indicates that
                           the current size of hostpath will be used.  In this
                           case it is assumed that hostpath exists and is a
                           regular file.

             OR

             disklabel     Use a disklabel partition identifier to specify the
                           offset and size of the mapping.  hostpath must con-
                           tain an existing and valid disklabel within the
                           first 64k.

             The following are optional:

             offset        Offset of the mapping.  The window into hostpath
                           therefore is [offset, offset+size].  In case this
                           parameter is not given, the default value 0 is
                           used.

             type          The type of file that key is exposed as within the
                           rump kernel.  The possibilities are ``blk'',
                           ``chr'', and ``reg'' for block device, character
                           device and regular file, respectively.  The default
                           is a block device.

                           Note: the contents of block devices are cached in
                           the rump kernel's buffer cache.  To avoid cache
                           incoherency, it is advisable not to access a file
                           through the host namespace while it is mapped as a
                           block device in a rump kernel.

             In case hostpath does not exist, it will be created as a regular
             file with mode 0644 (plus any restrictions placed by umask).  In
             case hostpath is a regular file and is not large enough to accom-
             modate the specified size, it will be extended to the specified
             size.

     -l library
             Call dlopen() on library before initializing the rump kernel.  In
             case library provides a kernel module, it will appear as a
             builtin module in the rump kernel.  Any rump component present in
             library will also be initialized.

             The argument library can contain a full path or a filename, in
             which case the standard dynamic library search path will be used.
             Libraries are loaded in the order they are given.  Dependencies
             are not autoloaded, and the order must be specified correctly.

     -m module
             Load and link a kernel module after the rump kernel is initial-
             ized.  For this to work, the rump kernel must include the vfs
             faction, since the module is loaded using kernel vfs code (see
             EXAMPLES).

     -r total_ram
             Sets the limit of kernel memory allocatable by the server to
             total_ram as opposed to the default which allows the server to
             allocate as much memory as the host will give it.  This parameter
             is especially useful for VFS servers, since by default the vir-
             tual file system will attempt to consume as much memory as it
             can, and accessing large files can cause an excessive amount of
             memory to be used as file system cache.

     -s      Do not detach from the terminal.  By default, rump_server
             detaches from the terminal once the service is running on url.

     -v      Set bootverbose.

     After use, rump_server can be made to exit using rump.halt(1).


EXAMPLES

     Start a server and load the tmpfs file system module, and halt the server
     immediately afterwards:

           $ rump_server -lrumpvfs -m /modules/tmpfs.kmod unix://sock
           $ env RUMP_SERVER=unix://sock rump.halt

     Start a server with the one gigabyte host file dk.img mapped as the block
     device /dev/dk in the rump kernel.

           $ rump_allserver -d key=/dev/dk,hostpath=dk.img,size=1g unix://sock

     Start a server which listens on INADDR_ANY port 3755

           $ rump_server tcp://0:3755/

     Start a FFS server with a 16MB kernel memory limit.

           $ rump_server -lrumpvfs -lrumpfs_ffs -r 16m unix:///tmp/ffs_server


SEE ALSO

     rump.halt(1), dlopen(3), rump(3), rump_sp(7)

NetBSD 6.0                     February 21, 2011                    NetBSD 6.0