Linux安装mysql登录问题-适用root强制登录

安装mysql5姿势是要先安装带有可用的mysql5系列社区版资源的rpm包

rpm -Uvh http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpm

这个时候查看当前可用的mysql安装资源：

yum repolist enabled | grep "mysql.*-community.*"

直接使用yum的方式安装MySQL了

yum -y install mysql-community-server

加入开机启动

systemctl enable mysqld

systemctl start mysqld

重置密码

mysql_secure_installation

安装mysql后，常规方法登录出现错误提示。直接：

/etc/my.cnf添加以下加粗的三句：

# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
#
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# 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
skip-grant-tables
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
port=3306
explicit_defaults_for_timestamp=true


# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0

# Recommended in standard MySQL setup
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES

[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

启动mysqld：【强制启动】

mysqld --user=root

创建hfishdb数据库

create database hfishdb;

最后，更改密码这些。

启动另一个窗口，然后：

步骤 1)：输入命令mysql -uroot
步骤 2)：输入use mysql;命令连接权限数据库。
步骤 3)：输入命令update mysql.user set authentication_string=password('新密码') where user='用户名' and Host ='localhost';设置新密码。
步骤 4)：输入 flush privileges; 命令刷新权限。
步骤 5)：输入quit;命令退出 MySQL 重新登录，此时密码已经修改为刚才输入的新密码了。

重要的是，最后应该在/etc/my.cnf中加注释：

#skip-grant-tables

最后，根据需求设定IP访问权限：

grant all privileges on *.* to 'root'@'特定IP地址' identified by '密码' with grant option;
flush privileges; 命令刷新权限