MySQL [Error] MySQL establishment of connection

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What should I do when MySQL reports an error [Error] MySQL establishment of connection, message from server Too many connection?

Too many connections, too many login users, and the number of configured MySQL connections is too small, or some connections are not closed, resulting in too many connections.

vim /etc/mysql/my.cnf

add code:

max_connections = 2000

Use tail to see if the file code has been increased

tail /etc/mysql/my.cnf

Restart the MySQL container and check whether MySQL started successfully

docker ps
// Check whether MySQL is started
docker stop mysql
// stop MySQL
docker ps
// check if it stops
docker start mysql
// restart MySQL
docker ps -a
// check if it is started

Complete MySQL startup