MySQL Instance Manager is been deprecated in MySQL 5.1 and is removed in MySQL 5.5.
This section discusses how Instance Manager starts server instances when it starts. However, before you start Instance Manager, you should set up a password file for it. Otherwise, you will not be able to connect to Instance Manager to control it after it starts. For details about creating Instance Manager accounts, see Section 126.96.36.199, “Instance Manager User and Password Management”.
On Unix, the mysqld MySQL database server
normally is started with the mysql.server
script, which usually resides in the
/etc/init.d/ directory. In MySQL 5.0.3, this
script invokes mysqlmanager (the MySQL
Instance Manager binary) to start MySQL. (In prior versions of
MySQL the mysqld_safe script is used for this
purpose.) Starting from MySQL 5.0.4, the behavior of the startup
script was changed again to incorporate both setup schemes. In
version 5.0.4, the startup script uses the old scheme (invoking
mysqld_safe) by default, but one can set the
use_mysqld_safe variable in the script to
0 (zero) to use the MySQL Instance Manager to
start a server.
Starting with MySQL 5.0.19, you can use Instance Manager if you
my.cnf configuration file by
use-manager to the
When Instance Manager starts, it reads its configuration file if
it exists to find server instance sections and prepare a list of
instances. Instance sections have names of the form
N is an unsigned integer (for
[mysqld2], and so forth).
After preparing the list of instances, Instance Manager starts
the guarded instances in the list. If there are no instances,
Instance Manager creates an instance named
mysqld and attempts to start it with default
(compiled-in) configuration values. This means that the Instance
Manager cannot find the mysqld program if it
is not installed in the default location.
(Section 2.7, “Installation Layouts”, describes default
locations for components of MySQL distributions.) If you have
installed the MySQL server in a nonstandard location, you should
create the Instance Manager configuration file.
Instance Manager also stops all guarded server instances when it shuts down.
The permissible options for
instance sections are described in
Section 188.8.131.52, “MySQL Instance Manager Configuration Files”. In these
sections, you can use a special
option that is recognized only by Instance Manager. Use this
option to let Instance Manager know where the
mysqld binary resides. If there are multiple
instances, it may also be necessary to set other options such as
port, to ensure
that each instance has a different data directory and TCP/IP
port number. Section 5.3, “Running Multiple MySQL Instances on One Machine”, discusses the
configuration values that must differ for each instance when you
run multiple instance on the same machine.
[mysqld] instance section, if it
exists, must not contain any Instance Manager-specific
The typical Unix startup/shutdown cycle for a MySQL server with the MySQL Instance Manager enabled is as follows:
The /etc/init.d/mysql script starts MySQL Instance Manager.
Instance Manager starts the guarded server instances and monitors them.
If a server instance fails, Instance Manager restarts it.
If Instance Manager is shut down (for example, with the /etc/init.d/mysql stop command), it shuts down all server instances.
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