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Added a new client, mysql_multi_mysqld and documentation about it. 


Docs/manual.texi:
  Added documentation about new client, mysql_multi_mysqld.
  This program is meant for managing multiple MySQL servers.
BitKeeper/etc/logging_ok:
  Logging to logging@openlogging.org accepted
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BitKeeper/etc/logging_ok
View file @ a3badce6
jani@prima.mysql.com jani@janikt.pp.saunalahti.fi
jcole@tetra.bedford.progress.com
jcole@tetra.spaceapes.com
jcole@tetra.uu.net
monty@donna.mysql.com
monty@narttu.mysql.fi
mwagner@evoq.home.mwagner.org
mwagner@work.mysql.com
paul@central.snake.net
sasha@donna.mysql.com
sasha@laptop.slkc.uswest.net
sasha@mysql.sashanet.com
sasha@work.mysql.com
serg@serg.mysql.com
tim@threads.polyesthetic.msg
tim@work.mysql.com
yfaktoro@nbyfaktoro.bedford.progress.com
yfaktoro@nslinuxw2.bedford.progress.com
Docs/manual.texi
View file @ a3badce6
...@@ -28020,6 +28020,7 @@ How big a @code{VARCHAR} column can be ...@@ -28020,6 +28020,7 @@ How big a @code{VARCHAR} column can be
@menu @menu
* Programs:: What do the executables do? * Programs:: What do the executables do?
* safe_mysqld:: * safe_mysqld::
* mysql_multi_mysqld:: Program for managing multiple @strong{MySQL} servers
* mysql:: The command line tool * mysql:: The command line tool
* mysqladmin:: Administering a @strong{MySQL} server * mysqladmin:: Administering a @strong{MySQL} server
* mysqldump:: Dumping the structure and data from @strong{MySQL} databases and tables * mysqldump:: Dumping the structure and data from @strong{MySQL} databases and tables
...@@ -28157,7 +28158,7 @@ shell> replace a b b a -- file1 file2 ... ...@@ -28157,7 +28158,7 @@ shell> replace a b b a -- file1 file2 ...
@cindex tools, safe_mysqld @cindex tools, safe_mysqld
@cindex scripts @cindex scripts
@cindex @code{safe_mysqld} @cindex @code{safe_mysqld}
@node safe_mysqld, mysql, Programs, Tools @node safe_mysqld, mysql_multi_mysqld, Programs, Tools
@section safe_mysqld, the wrapper around mysqld @section safe_mysqld, the wrapper around mysqld
@code{safe_mysqld} is the recommended way to start a @code{mysqld} @code{safe_mysqld} is the recommended way to start a @code{mysqld}
...@@ -28247,11 +28248,204 @@ upgrade @strong{MySQL} in the future, your modified version of ...@@ -28247,11 +28248,204 @@ upgrade @strong{MySQL} in the future, your modified version of
@code{safe_mysqld} will be overwritten, so you should make a copy of your @code{safe_mysqld} will be overwritten, so you should make a copy of your
edited version that you can reinstall. edited version that you can reinstall.
@cindex tools, mysql_multi_mysqld
@cindex scripts
@cindex @code{mysql_multi_mysqld}
@node mysql_multi_mysqld, mysql, safe_mysqld, Tools
@section mysql_multi_mysqld, program for managing multiple @code{MySQL} servers
@code{mysql_multi_mysqld} is meant for managing several @code{mysqld}
processes running in different UNIX sockets and TCP/IP ports.
The program will search for group(s) named [mysqld#] from my.cnf (or
the given --config-file=...), where # can be any positive number
starting from 1. These groups should be the same as the usual [mysqld]
group (e.g. options to mysqld, see MySQL manual for detailed
information about this group), but with those port, socket
etc. options that are wanted for each separate mysqld processes. The
number in the group name has another function; it can be used for
starting, stopping, or reporting some specific mysqld servers with
this program. See the usage and options below for more information.
@example
Usage: mysql_multi_mysqld [OPTIONS] @{start|stop|report@} [GNR,GNR,GNR...]
or mysql_multi_mysqld [OPTIONS] @{start|stop|report@} [GNR-GNR,GNR,GNR-GNR,...]
@end example
The GNR above means the group number. You can start, stop or report
any GNR, or several of them at the same time. (See --example) The GNRs
list can be comma separated, or a dash combined, of which the latter
means that all the GNRs between GNR1-GNR2 will be affected. Without
GNR argument all the found groups will be either started, stopped, or
reported. Note that you must not have any white spaces in the GNR
list. Anything after a white space are ignored.
@code{mysql_multi_mysqld} supports the following options:
@table @code
@cindex config-file option
@item --config-file=...
Alternative config file. NOTE: This will not affect this program's own
options (group [mysql_multi_mysqld]), but only groups [mysqld#]. Without
this option everything will be searched from the ordinary my.cnf file.
@cindex example option
@item --example
Give an example of a config file.
@cindex help option
@item --help
Print this help and exit.
@cindex log option
@item --log=...
Log file. Full path to and the name for the log file. NOTE: If the file
exists, everything will be appended.
@cindex mysqladmin option
@item --mysqladmin=...
mysqladmin binary to be used for a server shutdown.
@cindex mysqld option
@item --mysqld=...
mysqld binary to be used. Note that you can give safe_mysqld to this
option also. The options are passed to mysqld. Just make sure you have
mysqld in your PATH or fix safe_mysqld.
@cindex no-log option
@item --no-log
Print to stdout instead of the log file. By default the log file is
turned on.
@cindex password option
@item --password=...
Password for user for mysqladmin.
@cindex tcp-ip option
@item --tcp-ip
Connect to the MySQL server(s) via the TCP/IP port instead of the UNIX
socket. This affects stopping and reporting. If a socket file is
missing, the server may still be running, but can be accessed only via
the TCP/IP port. By default connecting is done via the UNIX socket.
@cindex user option
@item --user=...
MySQL user for mysqladmin.
@cindex version option
@item --version
Print the version number and exit.
@end table
Some notes about @code{mysql_multi_mysqld}:
@itemize @bullet
@item
Make sure that the @strong{MySQL} user, who is stopping the
@code{mysqld} services (e.g using the @code{mysqladmin}) have the same
password and username for all the data directories accessed (to the
'mysql' database) And make sure that the user has the 'Shutdown_priv'
privilege! If you have many data- directories and many different 'mysql'
databases with different passwords for the @strong{MySQL} 'root' user,
you may want to create a common 'multi_admin' user for each using the
same password (see below). Example how to do it:
@example
shell> mysql -u root -S /tmp/mysql.sock -proot_password -e
"GRANT SHUTDOWN ON *.* TO multi_admin@@localhost IDENTIFIED BY 'multipass'"
@end example
You will have to do the above for each @code{mysqld} running in each
data directory, that you have (just change the socket, -S=...)
@item
@code{pid-file} is very important, if you are using @code{safe_mysqld}
to start @code{mysqld} (e.g. --mysqld=safe_mysqld) Every @code{mysqld}
should have it's own @code{pid-file}. The advantage using
@code{safe_mysqld} instead of @code{mysqld} directly here is, that
@code{safe_mysqld} 'guards' every @code{mysqld} process and will restart
it, if a @code{mysqld} process fails due to signal kill -9, or
similar. (Like segmentation fault, which @strong{MySQL} should never do,
of course ;) Please note that @code{safe_mysqld} script may require that
you start it from a certain place. If you have problems starting, please
see the script. Check especially the lines:
@example
--------------------------------------------------------------------------
MY_PWD=`pwd` Check if we are starting this relative (for the binary
release) if test -d /data/mysql -a -f ./share/mysql/english/errmsg.sys
-a -x ./bin/mysqld
--------------------------------------------------------------------------
@end example
The above test should be successful, or you may encounter problems.
@item
Beware of the dangers starting multiple @code{mysqlds} in the same data
directory. Use separate data directories, unless you @strong{KNOW} what
you are doing!
@item
The socket file and the TCP/IP port must be different for every @code{mysqld}.
@item
The first and fifth @code{mysqld} group were intentionally left out from
the example. You may have 'gaps' in the config file. This gives you
more flexibility. The order in which the @code{mysqlds} are started or
stopped depends on the order in which they appear in the config file.
@item
When you want to refer to a certain group with GNR with this program,
just use the number in the end of the group name ( [mysqld# <== )
@item
You may want to use option '--user' for @code{mysqld}, but in order to
do this you need to be root when you start this script. Having the
option in the config file doesn't matter; you will just get a warning,
if you are no the superuser and the @code{mysqlds} are started under
@strong{YOUR} UNIX account. @strong{IMPORTANT}: Make sure that the
@code{pid-file} and the data directory is read+write(+execute for the
latter one) accessible for @strong{THAT} UNIX user, who the specific
@code{mysqld} process is started as. @strong{DON'T} use the UNIX root
account for this, unless you @strong{KNOW} what you are doing!
@item
@strong{MOST IMPORTANT}: Make sure that you understand the meanings of
the options that are passed to the @code{mysqlds} and why @strong{WOULD
YOU WANT} to have separate @code{mysqld} processes. Starting multiple
@code{mysqlds} in one data directory @strong{WILL NOT} give you extra
performance in a threaded system!
@end itemize
This is an example of the config file on behalf of @code{mysql_multi_mysqld}.
@example
# This file should probably be in your home dir (~/.my.cnf) or /etc/my.cnf
# Version 2.1 by Jani Tolonen
[mysql_multi_mysqld]
mysqld = /usr/local/bin/safe_mysqld
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
@end example
@cindex command line tool @cindex command line tool
@cindex tools, command line @cindex tools, command line
@cindex scripts @cindex scripts
@cindex @code{mysql} @cindex @code{mysql}
@node mysql, mysqladmin, safe_mysqld, Tools @node mysql, mysqladmin, mysql_multi_mysqld, Tools
@section The Command-line Tool @section The Command-line Tool
@code{mysql} is a simple SQL shell (with GNU @code{readline} capabilities). @code{mysql} is a simple SQL shell (with GNU @code{readline} capabilities).
...@@ -37608,7 +37802,7 @@ particular dataset}. ...@@ -37608,7 +37802,7 @@ particular dataset}.
* Fine-tuning:: * Fine-tuning::
@end menu @end menu
@node Fine-tuning, , , MySQL full-text search @node Fine-tuning, Environment variables, MySQL internals, Top
Unfortunately, full-text search has no user-tunable parameters yet Unfortunately, full-text search has no user-tunable parameters yet
(but adding some is very high in our TODO). But if one has @strong{MySQL} (but adding some is very high in our TODO). But if one has @strong{MySQL}
...@@ -39274,6 +39468,8 @@ though, so Version 3.23 is not released as a stable version yet. ...@@ -39274,6 +39468,8 @@ though, so Version 3.23 is not released as a stable version yet.
@appendixsubsec Changes in release 3.23.29 @appendixsubsec Changes in release 3.23.29
@itemize @bullet @itemize @bullet
@item @item
New client, @code{mysql_multi_mysqld}. @xref{mysql_multi_mysqld}.
@item
Fixed @code{DROP DATABASE} to work on OS/2. Fixed @code{DROP DATABASE} to work on OS/2.
@item @item
Fixed bug when doing a @code{SELECT DISTINCT ... table1 LEFT JOIN Fixed bug when doing a @code{SELECT DISTINCT ... table1 LEFT JOIN
scripts/mysql_multi_mysqld 0 → 100755
View file @ a3badce6
#!/usr/bin/perl
use Getopt::Long;
use POSIX qw(strftime);
$|=1;
$VER="2.1";
$opt_config_file = undef();
$opt_example = 0;
$opt_help = 0;
$opt_log = "/tmp/mysql_multi_mysqld.log";
$opt_mysqladmin = "mysqladmin";
$opt_mysqld = "mysqld";
$opt_no_log = 0;
$opt_password = undef();
$opt_tcp_ip = 0;
$opt_user = "root";
$opt_version = 0;
my ($mysqld, $mysqladmin, $groupids, $homedir, $my_progname);
$homedir = $ENV{HOME};
$my_progname = $0;
$my_progname =~ s/.*[\/]//;
main();
####
#### main sub routine
####
sub main
{
my ($flag_exit);
if (!defined(my_which(my_print_defaults)))
{
# We can't throw out yet, since --version, --help, or --example may
# have been given
print "WARNING! my_print_defaults command not found!\n";
print "Please make sure you have this command available and\n";
print "in your path. The command is available from the latest\n";
print "MySQL distribution.\n";
}
my @defops = `my_print_defaults mysql_multi_mysqld`;
chop @defops;
splice @ARGV, 0, 0, @defops;
GetOptions("help","example","version","mysqld=s","mysqladmin=s",
"config-file=s","user=s","password=s","log=s","no-log","tcp-ip")
|| die "Wrong option! See $my_progname --help for detailed information!\n";
$groupids = $ARGV[1];
if ($opt_version)
{
print "$my_progname version $VER by Jani Tolonen\n";
exit(0);
}
example() if ($opt_example);
if (!defined(($mysqld = my_which($opt_mysqld))))
{
print "Couldn't find the mysqld binary! Tried: $opt_mysqld\n";
$flag_exit=1;
}
if (!defined(($mysqladmin = my_which($opt_mysqladmin))))
{
print "Couldn't find the mysqladmin binary! Tried: $opt_mysqladmin\n";
$flag_exit=1;
}
usage() if ($opt_help);
if ($flag_exit)
{
print "Error with an option, see $my_progname --help for more info!\n";
exit(1);
}
if (!defined(my_which(my_print_defaults)))
{
print "ABORT: Can't find command 'my_print_defaults'!\n";
print "This command is available from the latest MySQL\n";
print "distribution. Please make sure you have the command\n";
print "in your PATH.\n";
exit(1);
}
usage() if (!defined($ARGV[0]) ||
($ARGV[0] ne 'start' && $ARGV[0] ne 'START' &&
$ARGV[0] ne 'stop' && $ARGV[0] ne 'STOP' &&
$ARGV[0] ne 'report' && $ARGV[0] ne 'REPORT'));
if (!$opt_no_log)
{
w2log("$my_progname log file version $VER; run: ",
"$opt_log", 1, 0);
}
else
{
print "$my_progname log file version $VER; run: ";
print strftime "%a %b %e %H:%M:%S %Y", localtime;
print "\n";
}
if ($ARGV[0] eq 'report' || $ARGV[0] eq 'REPORT')
{
report_mysqlds();
}
elsif ($ARGV[0] eq 'start' || $ARGV[0] eq 'START')
{
start_mysqlds();
}
else
{
stop_mysqlds();
}
}
####
#### Report living and not running MySQL servers
####
sub report_mysqlds
{
my (@groups, $com, $i, @options, $j, $pec);
print "Reporting MySQL servers\n";
if (!$opt_no_log)
{
w2log("\nReporting MySQL servers","$opt_log",0,0);
}
@groups = &find_groups($groupids);
for ($i = 0; defined($groups[$i]); $i++)
{
$com = "my_print_defaults";
$com.= defined($opt_config_file) ? " --config-file=$opt_config_file" : "";
$com.= " $groups[$i]";
@options = `$com`;
chop @options;
$com = "$mysqladmin -u $opt_user -p$opt_password";
$com.= $opt_tcp_ip ? " -h 127.0.0.1" : "";
for ($j = 0; defined($options[$j]); $j++)
{
if ((($options[$j] =~ m/^(\-\-socket)(.*)$/) && !$opt_tcp_ip) ||
($options[$j] =~ m/^(\-\-port)(.*)$/))
{
$com.= " $options[$j]";
}
}
$com.= " ping >> /dev/null 2>&1";
system($com);
$pec = $? >> 8;
if ($pec)
{
print "MySQL server from group: $groups[$i] is not running\n";
if (!$opt_no_log)
{
w2log("MySQL server from group: $groups[$i] is not running",
"$opt_log", 0, 0);
}
}
else
{
print "MySQL server from group: $groups[$i] is running\n";
if (!$opt_no_log)
{
w2log("MySQL server from group: $groups[$i] is running",
"$opt_log", 0, 0);
}
}
}
if (!$i)
{
print "No groups to be reported (check your GNRs)\n";
if (!$opt_no_log)
{
w2log("No groups to be reported (check your GNRs)", "$opt_log", 0, 0);
}
}
}
####
#### start multiple servers
####
sub start_mysqlds()
{
my (@groups, $com, $i, @options, $j);
if (!$opt_no_log)
{
w2log("\nStarting MySQL servers\n","$opt_log",0,0);
}
else
{
print "\nStarting MySQL servers\n";
}
@groups = &find_groups($groupids);
for ($i = 0; defined($groups[$i]); $i++)
{
$com = "my_print_defaults";
$com.= defined($opt_config_file) ? " --config-file=$opt_config_file" : "";
$com.= " $groups[$i]";
@options = `$com`;
chop @options;
$com = "$mysqld";
for ($j = 0; defined($options[$j]); $j++)
{
$com.= " $options[$j]";
}
$com.= " >> $opt_log 2>&1" if (!$opt_no_log);
$com.= " &";
system($com);
}
if (!$i && !$opt_no_log)
{
w2log("No MySQL servers to be started (check your GNRs)",
"$opt_log", 0, 0);
}
}
####
#### stop multiple servers
####
sub stop_mysqlds()
{
my (@groups, $com, $i, @options, $j);
if (!$opt_no_log)
{
w2log("\nStopping MySQL servers\n","$opt_log",0,0);
}
else
{
print "\nStopping MySQL servers\n";
}
@groups = &find_groups($groupids);
for ($i = 0; defined($groups[$i]); $i++)
{
$com = "my_print_defaults";
$com.= defined($opt_config_file) ? " --config-file=$opt_config_file" : "";
$com.= " $groups[$i]";
@options = `$com`;
chop @options;
$com = "$mysqladmin -u $opt_user -p$opt_password";
$com.= $opt_tcp_ip ? " -h 127.0.0.1" : "";
for ($j = 0; defined($options[$j]); $j++)
{
if ((($options[$j] =~ m/^(\-\-socket)(.*)$/) && !$opt_tcp_ip) ||
($options[$j] =~ m/^(\-\-port)(.*)$/))
{
$com.= " $options[$j]";
}
}
$com.= " shutdown";
$com.= " >> $opt_log 2>&1" if (!$opt_no_log);
$com.= " &";
system($com);
}
if (!$i && !$opt_no_log)
{
w2log("No MySQL servers to be stopped (check your GNRs)",
"$opt_log", 0, 0);
}
}
####
#### Find groups. Takes the valid group numbers as an argument, parses
#### them, puts them in the ascending order, removes duplicates and
#### returns the wanted groups accordingly.
####
sub find_groups
{
my ($raw_gids) = @_;
my (@groups, @data, @tmp, $line, $i, $k, @pre_gids, @gids, @tmp2,
$prev_value);
# Read the lines from the config file to variable 'data'
if (defined($opt_config_file))
{
open(MY_CNF, "<$opt_config_file") && (@data=<MY_CNF>) && close(MY_CNF);
}
else
{
if (-f "/etc/my.cnf" && -r "/etc/my.cnf")
{
open(MY_CNF, "</etc/my.cnf") && (@tmp=<MY_CNF>) && close(MY_CNF);
}
for ($i = 0; ($line = shift @tmp); $i++)
{
$data[$i] = $line;
}
if (-f "$homedir/.my.cnf" && -r "$homedir/.my.cnf")
{
open(MY_CNF, "<$homedir/.my.cnf") && (@tmp=<MY_CNF>) && close(MY_CNF);
}
for (; ($line = shift @tmp); $i++)
{
$data[$i] = $line;
}
}
chop @data;
# Make a list of the wanted group ids
if (defined($raw_gids))
{
@pre_gids = split(',', $raw_gids);
}
if (defined($raw_gids))
{
for ($i = 0, $j = 0; defined($pre_gids[$i]); $i++)
{
if ($pre_gids[$i] =~ m/^(\d+)$/)
{
$gids[$j] = $1;
$j++;
}
elsif ($pre_gids[$i] =~ m/^(\d+)(\-)(\d+)$/)
{
for ($k = $1; $k <= $3; $k++)
{
$gids[$j] = $k;
$j++;
}
}
else
{
print "ABORT: Bad GNR: $pre_gids[$i] See $my_progname --help\n";
exit(1);
}
}
}
# Sort the list of gids numerically in ascending order
@gids = sort {$a <=> $b} @gids;
# Remove non-positive integers and duplicates
for ($i = 0, $j = 0; defined($gids[$i]); $i++)
{
next if ($gids[$i] <= 0);
if (!$i || $prev_value != $gids[$i])
{
$tmp2[$j] = $gids[$i];
$j++;
}
$prev_value = $gids[$i];
}
@gids = @tmp2;
# Find and return the wanted groups
for ($i = 0, $j = 0; defined($data[$i]); $i++)
{
if ($data[$i] =~ m/^(\s*\[\s*)(mysqld)(\d+)(\s*\]\s*)$/)
{
if (defined($raw_gids))
{
for ($k = 0; defined($gids[$k]); $k++)
{
if ($gids[$k] == $3)
{
$groups[$j] = $2 . $3;
$j++;
}
}
}
else
{
$groups[$j] = $2 . $3;
$j++;
}
}
}
return @groups;
}
####
#### w2log: Write to a logfile.
#### 1.arg: append to the log file (given string, or from a file. if a file,
#### file will be read from $opt_logdir)
#### 2.arg: logfile -name (w2log assumes that the logfile is in $opt_logdir).
#### 3.arg. 0 | 1, if true, print current date to the logfile. 3. arg will
#### be ignored, if 1. arg is a file.
#### 4.arg. 0 | 1, if true, first argument is a file, else a string
####
sub w2log
{
my ($msg, $file, $date_flag, $is_file)= @_;
my (@data);
open (LOGFILE, ">>$opt_log")
or die "FATAL: w2log: Couldn't open log file: $opt_log\n";
if ($is_file)
{
open (FROMFILE, "<$msg") && (@data=<FROMFILE>) &&
close(FROMFILE)
or die "FATAL: w2log: Couldn't open file: $msg\n";
foreach my $line (@data)
{
print LOGFILE "$line";
}
}
else
{
print LOGFILE "$msg";
print LOGFILE strftime "%a %b %e %H:%M:%S %Y", localtime if ($date_flag);
print LOGFILE "\n";
}
close (LOGFILE);
return;
}
####
#### my_which is used, because we can't assume that every system has the
#### which -command. my_which can take only one argument at a time.
#### Return values: requested system command with the first found path,
#### or undefined, if not found.
####
sub my_which
{
my ($command) = @_;
my (@paths, $path);
return $command if (-f $command && -x $command);
@paths = split(':', $ENV{'PATH'});
foreach $path (@paths)
{
$path .= "/$command";
return $path if (-f $path && -x $path);
}
return undef();
}
####
#### example
####
sub example
{
print <<EOF;
# This is an example of a my.cnf file on behalf of $my_progname.
# This file should probably be in your home dir (~/.my.cnf) or /etc/my.cnf
# Version $VER by Jani Tolonen
# NOTES:
# 1.Make sure that the MySQL user, who is stopping the mysqld services (e.g
# using the mysqladmin) have the same password and username for all the
# data directories accessed (to the 'mysql' database) And make sure that
# the user has the 'Shutdown_priv' privilege! If you have many data-
# directories and many different 'mysql' databases with different passwords
# for the MySQL 'root' user, you may want to create a common 'multi_admin'
# user for each using the same password (see below). Example how to do it:
# shell> mysql -u root -S /tmp/mysql.sock -proot_password -e
# "GRANT SHUTDOWN ON *.* TO multi_admin\@localhost IDENTIFIED BY 'multipass'"
# You will have to do the above for each mysqld running in each data
# directory, that you have (just change the socket, -S=...)
# See more detailed information from chapter:
# '6 The MySQL Access Privilege System' from the MySQL manual.
# 2.pid-file is very important, if you are using safe_mysqld to start mysqld
# (e.g. --mysqld=safe_mysqld) Every mysqld should have it's own pid-file.
# The advantage using safe_mysqld instead of mysqld directly here is, that
# safe_mysqld 'guards' every mysqld process and will restart it, if mysqld
# process fails due to signal kill -9, or similar. (Like segmentation fault,
# which MySQL should never do, of course ;) Please note that safe_mysqld
# script may require that you start it from a certain place. If you have
# problems starting, please see the 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 above test should be successful, or you may encounter problems.
# 3.Beware of the dangers starting multiple mysqlds in the same data directory.
# Use separate data directories, unless you *KNOW* what you are doing!
# 4.The socket file and the TCP/IP port must be different for every mysqld.
# 5.The first and fifth mysqld was intentionally left out from the example.
# You may have 'gaps' in the config file. This gives you more flexibility.
# The order in which the mysqlds are started or stopped depends on the order
# in which they appear in the config file.
# 6.When you want to refer to a certain group with GNR with this program,
# just use the number in the end of the group name ( [mysqld# <== )
# 7.You may want to use option '--user' for mysqld, but in order to do this
# you need to be root when you start this script. Having the option
# in the config file doesn't matter; you will just get a warning, if you are
# no the superuser and the mysqld's are started under *your* unix account.
# IMPORTANT: Make sure that the pid-file and the data directory is
# read+write(+execute for the latter one) accessible for *THAT* UNIX user,
# who the specific mysqld process is started as. *DON'T* use the UNIX root
# account for this, unless you *KNOW* what you are doing!
# 8.MOST IMPORTANT: Make sure that you understand the meanings of the options
# that are passed to the mysqlds and why *WOULD YOU WANT* to have separate
# mysqld processes. Starting multiple mysqlds in one data directory *WON'T*
# give you extra performance in a threaded system! It takes too much space
# to describe everything here, please consult the MySQL manual.
#
[mysql_multi_mysqld]
mysqld = /usr/local/bin/safe_mysqld
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
EOF
exit(0);
}
####
#### usage
####
sub usage
{
print <<EOF;
$my_progname version $VER by Jani Tolonen
This software comes with ABSOLUTELY NO WARRANTY. This is free software,
and you are welcome to modify and redistribute it under the GPL license.
Description:
$my_progname can be used to start, or stop any number of separate
mysqld processes running in different TCP/IP ports and UNIX sockets.
This program can read group [mysql_multi_mysqld] from my.cnf file.
You may want to put options mysqld=... and mysqladmin=... there.
The program will search for group(s) named [mysqld#] from my.cnf (or
the given --config-file=...), where # can be any positive number
starting from 1. These groups should be the same as the usual [mysqld]
group (e.g. options to mysqld, see MySQL manual for detailed
information about this group), but with those port, socket
etc. options that are wanted for each separate mysqld processes. The
number in the group name has another function; it can be used for
starting, stopping, or reporting some specific mysqld servers with
this program. See the usage and options below for more information.
Usage: $my_progname [OPTIONS] {start|stop|report} [GNR,GNR,GNR...]
or $my_progname [OPTIONS] {start|stop|report} [GNR-GNR,GNR,GNR-GNR,...]
The GNR above means the group number. You can start, stop or report
any GNR, or several of them at the same time. (See --example) The GNRs
list can be comma separated, or a dash combined, of which the latter
means that all the GNRs between GNR1-GNR2 will be affected. Without
GNR argument all the found groups will be either started, stopped, or
reported. Note that you must not have any white spaces in the GNR
list. Anything after a white space are ignored.
Options:
--config-file=... Alternative config file. NOTE: This will not affect
this program's own options (group [mysql_multi_mysqld]),
but only groups [mysqld#]. Without this option everything
will be searched from the ordinary my.cnf file.
Using: $opt_config_file
--example Give an example of a config file. (PLEASE DO CHECK THIS!)
--help Print this help and exit.
--log=... Log file. Full path to and the name for the log file. NOTE:
If the file exists, everything will be appended.
Using: $opt_log
--mysqladmin=... mysqladmin binary to be used for a server shutdown.
Using: $mysqladmin
--mysqld=... mysqld binary to be used. Note that you can give safe_mysqld
to this option also. The options are passed to mysqld. Just
make sure you have mysqld in your PATH or fix safe_mysqld.
Using: $mysqld
--no-log Print to stdout instead of the log file. By default the log
file is turned on.
--password=... Password for user for mysqladmin.
--tcp-ip Connect to the MySQL server(s) via the TCP/IP port instead
of the UNIX socket. This affects stopping and reporting.
If a socket file is missing, the server may still be
running, but can be accessed only via the TCP/IP port.
By default connecting is done via the UNIX socket.
--user=... MySQL user for mysqladmin. Using: $opt_user
--version Print the version number and exit.
EOF
exit(0);
}
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