Queue Selection

A queue is a cluster, a group or farm of machines. Accelerator supports multiple queues that are managed by the same vovserver. Queue names begin with the letters vnc.

Start a Queue

The command to start a queue is ncmgr start [queue-name]. Entering a queue name is optional. By default, if no name is entered, the queue will be named vnc.

ncmgr start


vncmgr: Usage Message
  
  USAGE:
          % ncmgr start [options]
  OPTIONS:
          -h                      This help.
          -force                  Do not ask confirmation.
          -block                  Do not return to the shell or command prompt
                                  after starting. This is only useful, and
                                  required, when starting Accelerator as a
                                  Windows service.
          -port  <port|mode>      Specify port number, port number list (colon
                                  separated) or port mode. Modes are:
                                  automatic - hash queue name into port number,
                                              do not start if port is
                                              unavailable.  The default queue
                                              name 'vnc' hashes
                                              to port 6271.
                                  any - hash queue name into port number, try
                                        additional ports in increments of 1
                                        until an available one is found. The
                                        default queue name 'vnc' hashes to
                                        beginning port 11437.
                                  Default: any
          -webport <port|mode>    Specify a dedicated web interface port for
                                  HTTP and HTTPS protocols.  This port must be
                                  configured to enable REST API v3 interface,
                                  to enable the dashboard web UI page, and to
                                  enable SSL.  A value of 0 directs VovServer
                                  not to open a web interface port.  Port
                                  number lists, 'automatic', and 'any' are not
                                  supported.
                                  Default: 0
          -webprovider <provider>    Specify the provider for   
                                     HTTP and HTTPS protocols.  
                                     This must be either "internal" or "nginx". 
                                     Default: "nginx"
          -roport  <port|mode>    Specify read-only guest access web interface
                                  port. A value of 0 disables this interface,
                                  requiring all web interface users to log in.
                                  Default: 0
          -q, -queue <name>       Name for queue (default is vnc).
  
          -dir <dir>              Directory of the server
                                  (default $VOVDIR/../../vnc).
          -dbhost <host>          Host for database.
          -dbroot <path>          Path on database host for database files.
          -dbport <port>          Port of the database to listen for
                                  connections.
          -v                      Increase verbosity.
  EXAMPLS:
          % ncmgr start -port 6271
          % ncmgr start -port 6271:6272:6273:any -force
          % ncmgr start -q bigqueue -dir /remote/queues

Select a Queue Name

The default name of the Accelerator queue is vnc. Unless otherwise specified, all Accelerator commands act on the default queue.

To request a different queue one command at a time, by use the -q option with the nc command.

Example:

% nc [-q queue -name]run[run -options]command

Change the Default Queue with nc_queue

A different queue can be specified with using the -q option with the nc command.

To change the default Accelerator queue from vnc, set the environment variable NC_QUEUE to the queue name.

Example:

% setenv NC_QUEUE vnc_regr