MySQL开启远程连接

MySQL开启远程连接

远程连接MySQL

无法远程连接MySQL

配置Linux防火墙，允许访问MySQL的TCP 3306端口
[root@centos ~]# firewall-cmd --zone=public --add-port=3306/tcp --permanent
success
[root@centos ~]# firewall-cmd --list-ports
[root@centos ~]#
[root@centos ~]# firewall-cmd --reload
success
[root@centos ~]# firewall-cmd --list-ports
3306/tcp
[root@centos ~]#
查看MySQL是否已经启动
[root@centos ~]# systemctl status mysqld
● mysqld.service - MySQL Server
   Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
   Active: active (running) since Sat 2018-07-28 17:24:50 CST; 29s ago
     Docs: man:mysqld(8)
           http://dev.mysql.com/doc/refman/en/using-systemd.html
  Process: 2294 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)
 Main PID: 2311 (mysqld)
   Status: "SERVER_OPERATING"
   CGroup: /system.slice/mysqld.service
           └─2311 /usr/sbin/mysqld
Jul 28 17:24:47 centos systemd[1]: Starting MySQL Server...
Jul 28 17:24:50 centos systemd[1]: Started MySQL Server.
查看系统是否已经监听端口TCP 3306
[root@centos ~]# netstat -tunlp | grep 3306
tcp6       0      0 :::33060         :::*             LISTEN      24130/mysqld
tcp6       0      0 :::3306          :::*             LISTEN      24130/mysqld
[root@centos ~]#

修改配置

[root@centos ~]# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 13
Server version: 8.0.12 MySQL Community Server - GPL
Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> use mysql;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql>
mysql> show tables;
+---------------------------+
| Tables_in_mysql           |
+---------------------------+
| columns_priv              |
| component                 |
| db                        |
| default_roles             |
| engine_cost               |
| func                      |
| general_log               |
| global_grants             |
| gtid_executed             |
| help_category             |
| help_keyword              |
| help_relation             |
| help_topic                |
| innodb_index_stats        |
| innodb_table_stats        |
| password_history          |
| plugin                    |
| procs_priv                |
| proxies_priv              |
| role_edges                |
| server_cost               |
| servers                   |
| slave_master_info         |
| slave_relay_log_info      |
| slave_worker_info         |
| slow_log                  |
| tables_priv               |
| time_zone                 |
| time_zone_leap_second     |
| time_zone_name            |
| time_zone_transition      |
| time_zone_transition_type |
| user                      |
+---------------------------+
33 rows in set (0.01 sec)
mysql> select Host,User from user;
+-----------+------------------+
| Host      | User             |
+-----------+------------------+
| localhost | mysql.infoschema |
| localhost | mysql.session    |
| localhost | mysql.sys        |
| localhost | root             |
+-----------+------------------+
4 rows in set (0.00 sec)
mysql> update user set Host='%' where User='root';
Query OK, 1 row affected (0.04 sec)
Rows matched: 1  Changed: 1  Warnings: 0
mysql> select Host,User from user;
+-----------+------------------+
| Host      | User             |
+-----------+------------------+
| %         | root             |
| localhost | mysql.infoschema |
| localhost | mysql.session    |
| localhost | mysql.sys        |
+-----------+------------------+
4 rows in set (0.00 sec)
mysql>
mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)
mysql> quit
Bye
[root@centos ~]#

MySQL 8.0无法使用客户端连接

修改/etc/my.cnf

[root@centos ~]# vim /etc/my.cnf
# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/8.0/en/server-configuration-defaults.html
[mysqld]
#
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
#
# Remove the leading "# " to disable binary logging
# Binary logging captures changes between backups and is enabled by
# default. It's default setting is log_bin=binlog
# disable_log_bin
#
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M
#
# Remove leading # to revert to previous value for default_authentication_pluginn
,
# this will increase compatibility with older clients. For background, see:
# https://dev.mysql.com/doc/refman/8.0/en/server-system-variables.html#sysvar_dee
fault_authentication_plugin
# default-authentication-plugin=mysql_native_password
启用这句
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

修改认证方式

[root@centos ~]# mysql -uroot -p
Enter password:
mysql> use mysql;
Database changed
mysql> ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY 'root';
Query OK, 0 rows affected (0.04 sec)
或
mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'root';
mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)

重启MySQL

[root@centos ~]# systemctl restart mysqld

参考资料