(mysql.info) ndb-mgmd-process

(mysql.info) mysql-cluster-process-management

 
 15.5.3 `ndb_mgmd', the Management Server Process
 ------------------------------------------------
 
 The management server is the process that reads the cluster
 configuration file and distributes this information to all nodes in the
 cluster that request it. It also maintains a log of cluster activities.
 Management clients can connect to the management server and check the
 cluster's status.
 
 It is not strictly necessary to specify a connectstring when starting
 the management server. However, if you are using more than one
 management server, a connectstring should be provided and each node in
 the cluster should specify its node ID explicitly.
 
 See  mysql-cluster-connectstring, for information about using
 connectstrings.   mysql-cluster-command-options, describes other
 options for `ndb_mgmd'.
 
 The following files are created or used by `ndb_mgmd' in its starting
 directory, and are placed in the `DataDir' as specified in the
 `config.ini' configuration file. In the list that follows, NODE_ID is
 the unique node identifier.
 
    * `config.ini' is the configuration file for the cluster as a whole.
      This file is created by the user and read by the management server.
       mysql-cluster-configuration, discusses how to set up this
      file.
 
    * `ndb_NODE_ID_cluster.log' is the cluster events log file. Examples
      of such events include checkpoint startup and completion, node
      startup events, node failures, and levels of memory usage. A
      complete listing of cluster events with descriptions may be found
      in  mysql-cluster-management.
 
      When the size of the cluster log reaches one million bytes, the
      file is renamed to `ndb_NODE_ID_cluster.log.SEQ_ID', where SEQ_ID
      is the sequence number of the cluster log file. (For example: If
      files with the sequence numbers 1, 2, and 3 already exist, the
      next log file is named using the number `4'.)
 
    * `ndb_NODE_ID_out.log' is the file used for `stdout' and `stderr'
      when running the management server as a daemon.
 
    * `ndb_NODE_ID.pid' is the process ID file used when running the
      management server as a daemon.

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