mysql密码相关

Q1: root密码登录不了或忘记root密码

Answer: 在mysql配置文件（my.cnf / base.cnf）中[mysqld]下添加一行 skip_grant_tables，然后重启mysql，root用户即可无密码登录，然后设置新密码(详见Q2/Q3)，再删除skip_grant_tables并重启mysql。

***********************************************************************
## v1.0
root@karl-v1:/srv/leyao/main# cat conf.d/base.cnf
[mysqld]
init_connect='SET collation_connection = utf8_unicode_ci'
init_connect='SET NAMES utf8'
character-set-server=utf8
collation-server=utf8_unicode_ci
query_cache_size        = 64M
query_cache_type        = 1
join_buffer_size        = 512K
max_connections         = 150
max_allowed_packet              = 32M
skip_grant_tables
root@karl-v1:/srv/leyao/main#


*************************************************************************
# v2.0
karl-v2 docker # cat mysql/my.cnf
# The MySQL  Client configuration file.
#
# For explanations see
# http://dev.mysql.com/doc/mysql/en/server-system-variables.html

[mysql]

[mysqld]
sql-mode="STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"
character-set-server=utf8
max_allowed_packet=1048576
skip_grant_tables
karl-v2 docker #

Q2: 设置/修改root密码（v1.0）

use mysql;
update user set password=password("new_pwd") where user='root';
flush privileges;
update user set authentication_string=password('t4ecK@^y7I4CGJnwtajWuKDmAwktngth') where user='root'; #new try

Q3: 设置/修改root密码（v2.0）

use mysql;
alter user 'root'@'%' identified by 'new_pwd';
flush privileges;