What is MySQL multi-instance? How to set?

MySQL Multi-instance, on one server, the MySQL service opens several different ports, runs multiple service processes, these MySQL server processes through different sockets to listen to different data ports, complementary interference to provide their own services.

Advantages:

1 Efficient use of server resources

When a single server resource is too abundant, you can take advantage of the remaining resources to provide more services.

2 Conserve server resources

When the company funds tight, but the database needs to provide services between the database, and also want to use the master-slave replication, then the multi-instance is better.

3 Convenient post-architecture extension

When a project in a company starts, it does not necessarily have a large number of users during startup, so a set of physical database servers can be used. Deploy multiple instances above to facilitate subsequent extensions, migrations

Disadvantages:

Resource preemption Issues

When a server instance is high or slow, the entire instance consumes more memory CPU and IO resources, which results in a degraded quality of service on other instances on the server.

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What is MySQL multi-instance? How to set?