starting multiple instances with mysqld_multi

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Hi, I am exploring multiple instances with MySQL which will be running=
using the same set of binaries (single MySQL base). Two things which I'm n=
ot able to work out are - =091. Why mysqld_multi stop doesn'=
t work? Well, I know why it doesn't because there is nothing in the script =
to handle a 'stop' call; the actual question would be - why it doesn't work=
when it is mentioned in the MySQL reference manual? 2. how to (auto) =
restart the instances after a server restart? do I need to write my own scr=
ipt for this or is there anything available which I'm not aware of?=0AIf yo=
u have resolved these issues, please let me know.    =0ABest Regard=
s,=0ANitin =0A
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Re: starting multiple instances with mysqld_multi

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Hi,

You can run multiple instances on the same host and specify configuration
options either by adding the options as arguments on the command line, or b=
y
storing them in configuration files.

for example, from the command line:

shell> mysqld --port 3306 --log=3D/path/to/server1/log
shell> mysqld --port 3307 --log=3D/path/to/server2/log


So, when MySQL starts up it reads various config files in sequence. This
means that you can set global options for all instances in one file and the=
n
specific options for individual instances in separate files.

The files it reads by default are (on linux)

/etc/my.cnf
> the_mysql_data_dir/my.cnf
> ~/.my.cnf
>

You can direct the server to read specific config files after it reads the
default /etc/my.cnf file with the following directive.

--defaults-extra-file=3D/path/to/extra/config/file

So, if you wanted 2 instances running with some shared options and some
specific options, you could create additional configuration files in /etc
say:

/etc/my.server1.cnf
/etc/my.server2.cnf

where my.server1.cnf has the following lines:

port=3D3306
log=3D/path/to/log/file/for/server1
(other options here)

and my.server2.cnf is:

port=3D3307
log=3D/path/to/log/file/for/server2
(other options here)

then you could start the separate instances of mysqld as follows:

shell> mysqld --defaults-extra-file=3D/etc/my.server1.cnf
shell> mysqld --defaults-extra-file=3D/etc/my.server2.cnf

about *mysqld_multi*

> *mysqld_multi*
> mysqld_multi [ options] {start| stop| report} [ server_id]
> Use this to run multiple MySQL servers on different socket files and port=
s.
> To set up
> multiple servers, a different section of server options must be entered
> into a configuration file (e.g., /etc/my.cnf). The naming scheme for each
> section must be [mysqldn]
> where n is a different number for each server. Options must be entered
> separately for
> each server in its own section, even when servers use the same options. A=
t
> a minimum,
> each server should use a different socket file and a different TCP/IP por=
t.
> To see an
> example of how a configuration file might be set up for multiple servers,
> enter the
> following from the command line:
> mysqld_multi --example
> Once multiple servers have been configured, to start a server, you can
> enter something
> like the following from the command line:
> mysqld_multi start 3
> This line would start server number 3 listed in the configuration file as
> [mysqld3]. By
> entering report for the first argument, you can obtain the status on the
> server. For
> starting and stopping the server, this script uses the mysqladmin utility=
..
> Here is an
> alphabetical list of options specific to mysqld_multi that you can enter
> from the
> command line, along with a brief explanation of each:
> --config-file=3Dfilename
> Specifies the path and name of the server=92s configuration file if it is
> different from
> the default.
> --example
> Displays a sample configuration file.
> --help
> Displays basic help information.
> --log=3Dfilename
> Sets the path and name of the logfile. The default is
> /tmp/mysqld_multi.log.
> --mysqladmin=3Dpath
> Sets the path to the mysqladmin utility.
> --mysqld=3Dpath
> Specifies the path to mysqld.
> --no-log
> Instructs the utility not to save messages to a log, but to send them to
> stdout
> instead.
> --password=3Dpassword
> Provides the password for using mysqladmin.
> --tcp-ip
> Enables TCP/IP communication with the server instead of using a Unix-doma=
in
> socket.
> --user=3Duser
> Provides the username for using mysqladmin. The same user must be used fo=
r
> all
> servers.
> --version
> Displays the version of the utility.
>

Thanks,


On Tue, May 11, 2010 at 9:54 AM, Nitin Mehta wrote:

> Hi,
>
> I am exploring multiple instances with MySQL which will be running using
> the same set of binaries (single MySQL base). Two things which I'm not ab=
le
> to work out are -
>
> 1. Why mysqld_multi stop doesn't work? Well, I know why i=
t
> doesn't because there is nothing in the script to handle a 'stop' call; t=
he
> actual question would be - why it doesn't work when it is mentioned in th=
e
> MySQL reference manual?
> 2. how to (auto) restart the instances after a server restart? do =
I
> need to write my own script for this or is there anything available which
> I'm not aware of?
> If you have resolved these issues, please let me know.
>
>
> Best Regards,
> Nitin
>
>
>




--=20
Best Regards,

Prabhat Kumar
MySQL DBA
Datavail-India Mumbai
Mobile : 91-9987681929
www.datavail.com

My Blog: http://adminlinux.blogspot.com
My LinkedIn: http://www.linkedin.com/in/profileprabhat

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Re: starting multiple instances with mysqld_multi

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Content-Transfer-Encoding: quoted-printable

Thanks, Prabhat! You're very right, but did you read the questions I asked?=
=0A________________________________=0AFrom : Prabhat Kumar=
=0ATo: Nitin Mehta =0ACc: mysql@l=
ists.mysql.com=0ASent: Tue, May 11, 2010 11:54:22 AM=0ASubject: Re: startin=
g multiple instances with mysqld_multi Hi, You can run multiple i=
nstances on the same host and specify configuration options either by addin=
g the options as arguments on the command line, or by storing them in confi=
guration files. for example, from the command line: shell> mysqld=
--port 3306 --log=3D/path/to/server1/log=0Ashell> mysqld --port 3307 --log=
=3D/path/to/server2/log =0ASo, when MySQL starts up it reads various c=
onfig files in sequence. This means that you can set global options for all=
instances in one file and then specific options for individual instances i=
n separate files. The files it reads by default are (on linux) =
=0A>>/etc/my.cnf=0A>>the_mysql_data_dir/my.cnf=0A>>~/.my.cnf =0A>>=0AYou can=
direct the server to read specific config files after it reads the default=
/etc/my.cnf file with the following directive. --defaults-extra-file=
=3D/path/to/extra/config/file So, if you wanted 2 instances running wi=
th some shared options and some specific options, you could create addition=
al configuration files in /etc say: /etc/my.server1.cnf=0A/etc/my.serv=
er2.cnf where my.server1.cnf has the following lines: port=3D3306=
=0Alog=3D/path/to/log/file/for/server1=0A(other options here) and my.s=
erver2.cnf is: port=3D3307=0Alog=3D/path/to/log/file/for/server2=0 A(ot=
her options here) then you could start the separate instances of mysql=
d as follows: shell> mysqld --defaults-extra-file=3D/etc/my.server1.cn=
f=0Ashell> mysqld --defaults-extra-file=3D/etc/my.server2.cnf about my=
sqld_multi=0Amysqld_multi=0A>>mysqld_multi [ options] {start| stop| report}=
[ server_id]=0A>Use this to run multiple MySQL servers on different socket=
files and ports. To set up=0A>multiple servers, a different section of ser=
ver options must be entered into a configuration file (e.g., /etc/my.cnf). =
The naming scheme for each section must be [mysqldn]=0A>>where n is a diffe=
rent number for each server. Options must be entered separately for=0A>each=
server in its own section, even when servers use the same options. At a mi=
nimum,=0A>each server should use a different socket file and a different TC=
P/IP port. To see an=0A>>example of how a configuration file might be set u=
p for multiple servers, enter the=0A>following from the command line:=0A>my=
sqld_multi --example=0A>Once multiple servers have been configured, to star=
t a server, you can enter something=0A>>like the following from the command=
line:=0A>mysqld_multi start 3=0A>This line would start server number 3 lis=
ted in the configuration file as [mysqld3]. By=0A>entering report for the f=
irst argument, you can obtain the status on the server. For=0A>>starting an=
d stopping the server, this script uses the mysqladmin utility. Here is an=
=0A>alphabetical list of options specific to mysqld_multi that you can ente=
r from the=0A>command line, along with a brief explanation of each:=0A>>--c=
onfig-file=3Dfilename=0A>Specifies the path and name of the serverâ€=99=
s configuration file if it is different from=0A>the default.=0A>--example=
=0A>Displays a sample configuration file.=0A>--help=0A>Displays basic help =
information.=0A>>--log=3Dfilename=0A>Sets the path and name of the logfile.=
The default is /tmp/mysqld_multi.log.=0A>--mysqladmin=3Dpath=0A>Sets the p=
ath to the mysqladmin utility.=0A>--mysqld=3Dpath=0A>Specifies the path to =
mysqld.=0A>--no-log=0A>>Instructs the utility not to save messages to a log=
, but to send them to stdout=0A>instead.=0A>--password=3Dpassword=0A>Provid=
es the password for using mysqladmin.=0A>--tcp-ip=0A>Enables TCP/IP communi=
cation with the server instead of using a Unix-domain=0A>>socket.=0A>--user=
=3Duser=0A>Provides the username for using mysqladmin. The same user must b=
e used for all=0A>servers.=0A>--version=0A>Displays the version of the util=
ity.=0A>=0AThanks, On Tue, May 11, 2010 at 9:54 AM, Nitin Mehta =
wrote: >Hi,=0A>=0A>>I am exploring multiple instanc=
es with MySQL which will be running using the same set of binaries (single =
MySQL base). Two things which I'm not able to work out are -=0A>=0A>> =
1. Why mysqld_multi stop doesn't work? Well, I know why it doesn=
't because there is nothing in the script to handle a 'stop' call; the actu=
al question would be - why it doesn't work when it is mentioned in the MySQ=
L reference manual?=0A>>=0A> 2. how to (auto) restart the instances =
after a server restart? do I need to write my own script for this or is the=
re anything available which I'm not aware of?=0A>>If you have resolved thes=
e issues, please let me know.=0A>> =0A>> =0A>>Best Regards,=0A>Nitin=0A>=0A=
>=0A>> =0A-- =0ABest Regards, Prabhat Kumar=0AMySQL DBA=0AD=
atavail-India Mumbai=0AMobile : 91-9987681929=0Awww.datavail.com M=
y Blog: http://adminlinux.blogspot.com=0AMy LinkedIn: http://www.linkedin.c=
om/in/profileprabhat
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Re: starting multiple instances with mysqld_multi

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