How to install multiple MySQL instances on linux
In some cases, you might want to run multiple instances of MySQL on a single machine. You might want to test a new MySQL release while leaving an existing production setup undisturbed. Or you might want to give different users access to different mysqld servers that they manage themselves. (For example, you might be an Internet Service Provider that wants to provide independent MySQL installations for different customers.) Show It is possible to use a different MySQL server binary per instance, or use the same binary for multiple instances, or any combination of the two approaches. For example, you might run a server from MySQL 5.7 and one from MySQL 8.0, to see how different versions handle a given workload. Or you might run multiple instances of the current production version, each managing a different set of databases. Whether or not you use distinct server binaries, each instance that you run must be configured with unique values for several operating parameters. This eliminates the potential for conflict between instances. Parameters can be set on the command line, in option files, or by setting environment variables. See Section 4.2.2, “Specifying Program Options”.
To see the values used by a given instance, connect to it and execute a The primary resource managed by a MySQL instance is the data directory. Each instance should use a different data directory, the location of which is specified using the
In addition to using different data directories, several other options must have different values for each server instance:
If you use the following log file options, their values must differ for each server:
For further discussion of log file options, see Section 5.4, “MySQL Server Logs”. To achieve better performance, you can specify the following option differently for each server, to spread the load between several physical disks:
Having different temporary directories also makes it easier to determine which MySQL server created any given temporary file. If you
have multiple MySQL installations in different locations, you can specify the base directory for each installation with the As discussed in the following sections, it is possible to start additional servers by specifying appropriate command options or by setting environment variables. However, if you need to run multiple servers on a more permanent basis, it is more convenient to use option files to specify for each server
those option values that must be unique to it. The Can I have 2 versions of MySQL installed?This indicates that using the MySQL community installer, we can install a different version of MySQL but cannot install multiple instances of the same version. To run multiple instances, the second instance of MySQL must install as a windows service. The installation must be performed manually using a command prompt.
Can you run multiple MySQL servers on a single machine?It is possible to use a different MySQL server binary per instance, or use the same binary for multiple instances, or any combination of the two approaches. For example, you might run a server from MySQL 5.7 and one from MySQL 8.0, to see how different versions handle a given workload.
What are instances in MySQL?A server instance is a MySQL server running somewhere, and also how to connect to it. See the reference manual, which says: A server instance is created to provide a way of connecting to a server to be managed.
What is Mysql_install_db?mysql_install_db initializes the MySQL data directory and creates the system tables that it contains, if they do not exist. It also initializes the system tablespace and related data structures needed to manage InnoDB tables. As of MySQL 5.6.
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