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od
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perl
perl56delta
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_exit
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FreeBSD/Linux/UNIX General Commands Manual
Hypertext Man Pages
mysqld_multi
 
MYSQLD_MULTI(1) 	     MySQL Database System	       MYSQLD_MULTI(1)



NAME
       mysqld_multi - manage multiple MySQL servers

SYNOPSIS
       mysqld_multi [options] {start|stop|report} [GNR[,GNR] ...]

DESCRIPTION
       mysqld_multi is designed to manage several mysqld processes that listen
       for connections on different Unix socket files and TCP/IP ports. It can
       start or stop servers, or report their current status.

       mysqld_multi searches for groups named [mysqldN] in my.cnf (or in the
       file named by the --config-file option).  N can be any positive
       integer. This number is referred to in the following discussion as the
       option group number, or GNR. Group numbers distinguish option groups
       from one another and are used as arguments to mysqld_multi to specify
       which servers you want to start, stop, or obtain a status report for.
       Options listed in these groups are the same that you would use in the
       [mysqld] group used for starting mysqld. (See, for example,
       Section 9.2.2, "Starting and Stopping MySQL Automatically".) However,
       when using multiple servers, it is necessary that each one use its own
       value for options such as the Unix socket file and TCP/IP port number.
       For more information on which options must be unique per server in a
       multiple-server environment, see Section 10, "Running Multiple MySQL
       Servers on the Same Machine".

       To invoke mysqld_multi, use the following syntax:

       shell> mysqld_multi [options] {start|stop|report} [GNR[,GNR] ...]

       start, stop, and report indicate which operation to perform. You can
       perform the designated operation for a single server or multiple
       servers, depending on the GNR list that follows the option name. If
       there is no list, mysqld_multi performs the operation for all servers
       in the option file.

       Each GNR value represents an option group number or range of group
       numbers. The value should be the number at the end of the group name in
       the option file. For example, the GNR for a group named [mysqld17] is
       17. To specify a range of numbers, separate the first and last numbers
       by a dash. The GNR value 10-13 represents groups [mysqld10] through
       [mysqld13]. Multiple groups or group ranges can be specified on the
       command line, separated by commas. There must be no whitespace
       characters (spaces or tabs) in the GNR list; anything after a
       whitespace character is ignored.

       This command starts a single server using option group [mysqld17]:

       shell> mysqld_multi start 17

       This command stops several servers, using option groups [mysqld8] and
       [mysqld10] through [mysqld13]:

       shell> mysqld_multi stop 8,10-13

       For an example of how you might set up an option file, use this
       command:

       shell> mysqld_multi --example

       mysqld_multi supports the following options:

       o  --help

	  Display a help message and exit.

       o  --config-file=name

	  Specify the name of an alternative option file. This affects where
	  mysqld_multi looks for [mysqldN] option groups. Without this option,
	  all options are read from the usual my.cnf file. The option does not
	  affect where mysqld_multi reads its own options, which are always
	  taken from the [mysqld_multi] group in the usual my.cnf file.

       o  --example

	  Display a sample option file.

       o  --log=file_name

	  Specify the name of the log file. If the file exists, log output is
	  appended to it.

       o  --mysqladmin=prog_name

	  The mysqladmin binary to be used to stop servers.

       o  --mysqld=prog_name

	  The mysqld binary to be used. Note that you can specify mysqld_safe
	  as the value for this option also. If you use mysqld_safe to start
	  the server, you can include the mysqld or ledir options in the
	  corresponding [mysqldN] option group. These options indicate the
	  name of the server that mysqld_safe should start and the pathname of
	  the directory where the server is located. (See the descriptions for
	  these options in mysqld_safe(1).) Example:

	  [mysqld38]
	  mysqld = mysqld-max
	  ledir  = /opt/local/mysql/libexec

       o  --no-log

	  Print log information to stdout rather than to the log file. By
	  default, output goes to the log file.

       o  --password=password

	  The password of the MySQL account to use when invoking mysqladmin.
	  Note that the password value is not optional for this option, unlike
	  for other MySQL programs.

       o  --silent

	  Silent mode; disable warnings. This option was added in MySQL 4.1.6.

       o  --tcp-ip

	  Connect to each MySQL server via the TCP/IP port instead of the Unix
	  socket file. (If a socket file is missing, the server might still be
	  running, but accessible only via the TCP/IP port.) By default,
	  connections are made using the Unix socket file. This option affects
	  stop and report operations.

       o  --user=user_name

	  The username of the MySQL account to use when invoking mysqladmin.

       o  --verbose

	  Be more verbose. This option was added in MySQL 4.1.6.

       o  --version

	  Display version information and exit.

       Some notes about mysqld_multi:

       o  Most important: Before using mysqld_multi be sure that you
	  understand the meanings of the options that are passed to the mysqld
	  servers and why you would want to have separate mysqld processes.
	  Beware of the dangers of using multiple mysqld servers with the same
	  data directory. Use separate data directories, unless you know what
	  you are doing. Starting multiple servers with the same data
	  directory does not give you extra performance in a threaded system.
	  See Section 10, "Running Multiple MySQL Servers on the Same
	  Machine".

       o  Important: Make sure that the data directory for each server is
	  fully accessible to the Unix account that the specific mysqld
	  process is started as.  Do not use the Unix root account for this,
	  unless you know what you are doing. See Section 4.5, "How to Run
	  MySQL as a Normal User".

       o  Make sure that the MySQL account used for stopping the mysqld
	  servers (with the mysqladmin program) has the same username and
	  password for each server. Also, make sure that the account has the
	  SHUTDOWN privilege. If the servers that you want to manage have
	  different usernames or passwords for the administrative accounts,
	  you might want to create an account on each server that has the same
	  username and password. For example, you might set up a common
	  multi_admin account by executing the following commands for each
	  server:

	  shell> mysql -u root -S /tmp/mysql.sock -p
	  Enter password:
	  mysql> GRANT SHUTDOWN ON *.*
	      -> TO 'multi_admin'@'localhost' IDENTIFIED BY 'multipass';
	  See Section 5.2, "How the Privilege System Works". You have to do
	  this for each mysqld server. Change the connection parameters
	  appropriately when connecting to each one. Note that the hostname
	  part of the account name must allow you to connect as multi_admin
	  from the host where you want to run mysqld_multi.

       o  The Unix socket file and the TCP/IP port number must be different
	  for every mysqld.

       o  The --pid-file option is very important if you are using mysqld_safe
	  to start mysqld (for example, --mysqld=mysqld_safe) Every mysqld
	  should have its own process ID file. The advantage of using
	  mysqld_safe instead of mysqld is that mysqld_safe monitors its
	  mysqld process and restarts it if the process terminates due to a
	  signal sent using kill -9 or for other reasons, such as a
	  segmentation fault. Please note that the mysqld_safe script might
	  require that you start it from a certain place. This means that you
	  might have to change location to a certain directory before running
	  mysqld_multi. If you have problems starting, please see the
	  mysqld_safe script. Check especially the lines:

	  ----------------------------------------------------------------
	  MY_PWD=`pwd`
	  # Check if we are starting this relative (for the binary release)
	  if test -d $MY_PWD/data/mysql -a -f ./share/mysql/english/errmsg.sys -a \
	   -x ./bin/mysqld
	  ----------------------------------------------------------------
	  The test performed by these lines should be successful, or you might
	  encounter problems. See mysqld_safe(1).

       o  You might want to use the --user option for mysqld, but to do this
	  you need to run the mysqld_multi script as the Unix root user.
	  Having the option in the option file does not matter; you merely get
	  a warning if you are not the superuser and the mysqld processes are
	  started under your own Unix account.

       The following example shows how you might set up an option file for use
       with mysqld_multi. The order in which the mysqld programs are started
       or stopped depends on the order in which they appear in the option
       file. Group numbers need not form an unbroken sequence. The first and
       fifth [mysqldN] groups were intentionally omitted from the example to
       illustrate that you can have "gaps" in the option file. This gives you
       more flexibility.

       # This file should probably be in your home dir (~/.my.cnf)
       # or /etc/my.cnf
       # Version 2.1 by Jani Tolonen
       [mysqld_multi]
       mysqld	  = /usr/local/bin/mysqld_safe
       mysqladmin = /usr/local/bin/mysqladmin
       user	  = multi_admin
       password   = multipass
       [mysqld2]
       socket	  = /tmp/mysql.sock2
       port	  = 3307
       pid-file   = /usr/local/mysql/var2/hostname.pid2
       datadir	  = /usr/local/mysql/var2
       language   = /usr/local/share/mysql/english
       user	  = john
       [mysqld3]
       socket	  = /tmp/mysql.sock3
       port	  = 3308
       pid-file   = /usr/local/mysql/var3/hostname.pid3
       datadir	  = /usr/local/mysql/var3
       language   = /usr/local/share/mysql/swedish
       user	  = monty
       [mysqld4]
       socket	  = /tmp/mysql.sock4
       port	  = 3309
       pid-file   = /usr/local/mysql/var4/hostname.pid4
       datadir	  = /usr/local/mysql/var4
       language   = /usr/local/share/mysql/estonia
       user	  = tonu
       [mysqld6]
       socket	  = /tmp/mysql.sock6
       port	  = 3311
       pid-file   = /usr/local/mysql/var6/hostname.pid6
       datadir	  = /usr/local/mysql/var6
       language   = /usr/local/share/mysql/japanese
       user	  = jani

       See Section 3.2, "Using Option Files".

SEE ALSO
       isamchk(1), isamlog(1), msql2mysql(1), myisamchk(1), myisamlog(1),
       myisampack(1), mysql(1), mysql.server(1), mysql_config(1),
       mysql_fix_privilege_tables(1), mysql_zap(1), mysqlaccess(1),
       mysqladmin(1), mysqlbinlog(1), mysqlcheck(1), mysqld(1),
       mysqld_safe(1), mysqldump(1), mysqlhotcopy(1), mysqlimport(1),
       mysqlshow(1), pack_isam(1), perror(1), replace(1), safe_mysqld(1)

       For more information, please refer to the MySQL Reference Manual, which
       may already be installed locally and which is also available online at
       http://dev.mysql.com/doc/.

AUTHOR
       MySQL AB (http://www.mysql.com/).  This software comes with no
       warranty.



MySQL 4.1			  01/27/2006		       MYSQLD_MULTI(1)
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