Mysql无法远程连接解决方案

前言

Mysql 版本：5.7.23
操作系统：Linux
问题描述：
只能通过Linux系统账号Root命令行进入数据库，无法使用JDBC，远程连接工具进入数据库。
报错：ERROR 1698 (28000): Access denied for user 'root'@'localhost'
这个问题明显就是没有开放远程连接授权，所以导致只能使用Linux的Root账号登录。

解决流程

1.找到/etc/mysql/mysql.conf.d/mysqld.cnf文件，在[mysqld]最后面加skip-grant-tables

## The MySQL database server configuration file.## You can copy this to one of:# - "/etc/mysql/my.cnf" to set global options,# - "~/.my.cnf" to set user-specific options.# # One can use all long options that the program supports.# Run program with --help to get a list of available options and with# --print-defaults to see which it would actually understand and use.## For explanations see# http://dev.mysql.com/doc/mysql/en/server-system-variables.html# This will be passed to all mysql clients# It has been reported that passwords should be enclosed with ticks/quotes# escpecially if they contain "#" chars...# Remember to edit /etc/mysql/debian.cnf when changing the socket location.# Here is entries for some specific programs# The following values assume you have at least 32M ram[mysqld_safe]socket      = /var/run/mysqld/mysqld.socknice        = 0[mysqld]## * Basic Settings#user        = mysqlpid-file    = /var/run/mysqld/mysqld.pidsocket      = /var/run/mysqld/mysqld.sockport        = 3306basedir     = /usrdatadir     = /var/lib/mysqltmpdir      = /tmplc-messages-dir = /usr/share/mysqlskip-external-locking# 加入的内容,开启跳过权限校验skip-grant-tables## Instead of skip-networking the default is now to listen only on# localhost which is more compatible and is not less secure.bind-address        = 127.0.0.1## * Fine Tuning#key_buffer_size     = 16Mmax_allowed_packet  = 16Mthread_stack        = 192Kthread_cache_size       = 8# This replaces the startup script and checks MyISAM tables if needed# the first time they are touchedmyisam-recover-options  = BACKUP#max_connections        = 100#table_open_cache       = 64#thread_concurrency     = 10## * Query Cache Configuration#query_cache_limit   = 1Mquery_cache_size        = 16M## * Logging and Replication## Both location gets rotated by the cronjob.# Be aware that this log type is a performance killer.# As of 5.1 you can enable the log at runtime!#general_log_file        = /var/log/mysql/mysql.log#general_log             = 1## Error log - should be very few entries.#log_error = /var/log/mysql/error.log## Here you can see queries with especially long duration#slow_query_log     = 1#slow_query_log_file    = /var/log/mysql/mysql-slow.log#long_query_time = 2#log-queries-not-using-indexes## The following can be used as easy to replay backup logs or for replication.# note: if you are setting up a replication slave, see README.Debian about#       other settings you may need to change.#server-id      = 1#log_bin            = /var/log/mysql/mysql-bin.logexpire_logs_days    = 10max_binlog_size   = 100M#binlog_do_db       = include_database_name#binlog_ignore_db   = include_database_name## * InnoDB## InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/.# Read the manual for more InnoDB related options. There are many!## * Security Features## Read the manual, too, if you want chroot!# chroot = /var/lib/mysql/## For generating SSL certificates I recommend the OpenSSL GUI "tinyca".## ssl-ca=/etc/mysql/cacert.pem# ssl-cert=/etc/mysql/server-cert.pem# ssl-key=/etc/mysql/server-key.pem

保存后，重启服务sudo service mysql restart.

2.无验证进入mysql数据库修改user表中root账号信息，flush privileges;

ckmike@ckmikePC:~$ mysqlWelcome to the MySQL monitor.  Commands end with ; or \g.Your MySQL connection id is 2Server version: 5.7.23-0ubuntu0.18.04.1 (Ubuntu)Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.mysql> use mysqlReading table information for completion of table and column namesYou can turn off this feature to get a quicker startup with -ADatabase changedmysql> update mysql.user set authentication_string=password('账号密码') where user='root';Query OK, 0 rows affected, 1 warning (0.03 sec)Rows matched: 3  Changed: 0  Warnings: 1mysql> update user set plugin="mysql_native_password";Query OK, 1 row affected (0.00 sec)Rows matched: 7  Changed: 1  Warnings: 0mysql> flush privileges;Query OK, 0 rows affected (0.00 sec)mysql> quitBye

3./etc/mysql/mysql.conf.d/mysqld.cnf文件，去掉skip-grant-tables，开启校验

4.重启服务

sudo service mysql restart;至此就搞定了，使用jdbc、非Linuxroot账号都可以登录了。