Docker deploys mysql remote connection to solve 2003 problems

firewall-cmd --add-port=3306/tcp --permanent
// --permanent is permanently effective. Without this parameter, it will become invalid after restart.

firewall-cmd --reload
// Reload

systemctl stop firewalld

systemctl enable iptables
// Set up boot

firewall-cmd --reload
// Reload

[root@localhost ~]# docker exec -it javakfmysql bash ## javakfmysql is the alias of the container, you can also use the container id instead

root@e285125c99d6:/#mysql -u root -p

mysql> select host,user,plugin,authentication_string from mysql.user; 
+-----------+------------------+-----------------------+------------------------------------------------------------------------+
| host | user | plugin | authentication_string |
+-----------+------------------+-----------------------+------------------------------------------------------------------------+
| % | root | caching_sha2_password | $A$005$HF7;krfwhkKHp5fPenQm4J2dm/RJtbbyjtCUVdDCcboXQw3ALxsif/sS1 |
| localhost | mysql.infoschema | caching_sha2_password | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| localhost | mysql.session | caching_sha2_password | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| localhost | mysql.sys | caching_sha2_password | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| localhost | root | mysql_native_password | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |
+-----------+------------------+-----------------------+------------------------------------------------------------------------+

ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY '123456'; ### 123456 mysql login password flush privileges;

mysql> select host,user,plugin,authentication_string from mysql.user;
+-----------+------------------+-----------------------+------------------------------------------------------------------------+
| host | user | plugin | authentication_string |
+-----------+------------------+-----------------------+------------------------------------------------------------------------+
| % | root | mysql_native_password | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |
| localhost | mysql.infoschema | caching_sha2_password | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| localhost | mysql.session | caching_sha2_password | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| localhost | mysql.sys | caching_sha2_password | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| localhost | root | mysql_native_password | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |
+-----------+------------------+-----------------------+------------------------------------------------------------------------+
5 rows in set (0.00 sec)