1.下载离线安装包
官网下载:https://dev.mysql.com/downloads/mysql/ 本文使用的linux通用版
https://cdn.mysql.com//Downloads/MySQL-8.0/mysql-8.0.19-linux-glibc2.12-x86_64.tar.xz
2.检查linux OS环境现状
2.1 确保mysql安装之前有libaio依赖
yum search libaio
yum install libaio
2.2 删除系统自带mariadb
[gz_admin@ ~]# rpm -qa|grep mariadb
mariadb-libs-5.5.44-2.el7.centos.x86_64
[gz_admin@~]# rpm -e --nodeps mariadb-libs-5.5.44-2.el7.centos.x86_64
2.3 删除etc目录下的my.cnf文件
rm -rf /etc/my.cnf
3.解压msyql安装包到指定目录下
cd /usr/local
tar -xvf mysql-8.0.19-linux-glibc2.12-x86_64.tar.xz
4.新建mysql数据及日志存放路径
cd /data
mkdir mysql
cd mysql
mkdir data # 存放mysql数据
5.修改配置文件
touch /etc/my.cnf
vim my.cnf
my.cnf文件内容如下:
#配置如下
[mysql]
#设置mysql客户端默认字符集
default-character-set=utf8
[mysqld]
#设置3306端口
port=3306
#套接字保存路径
socket=/data/mysql/mysql.sock
#设置mysql的安装目录
basedir=/usr/local/mysql/mysql-8.0.19-linux-glibc2.12-x86_64
#设置mysql数据库的数据的存放目录
datadir=/data/mysql/data
#报错日志路径
log-error=/data/mysql/error.log
pid-file=/data/mysql/mysql.pid
#允许最大连接数
max_connections=1000
# 允许连接失败的次数防止有人从该主机试图攻击数据库系统
max_connect_errors=10
#服务端使用的字符集默认为8比特编码的latin1字符集
character-set-server=utf8
#创建新表时将使用的默认存储引擎
default-storage-engine=INNODB
max_allowed_packet=64M
lower_case_table_names=1
transaction_isolation=READ-COMMITTED
[mysqld_safe]
socket=/data/mysql/mysql.sock
[client]
port=3306
socket=/data/mysql/mysql.sock
[mysql.server]
socket=/data/mysql/mysql.sock
6.创建运行mysql数据库的OS用户和用户组
# groupadd mysql #创建mysql用户组
# useradd -g mysql mysql #创建用户名为mysql的用户并加入mysql用户组
# passwd mysql #修改password 为 mysql
Changing password for user mysql.
New password:
BAD PASSWORD: The password is a palindrome
Retype new password:
passwd: all authentication tokens updated successfully.
7.修改mysql目录权限
chown -R mysql:mysql /usr/local/mysql # 修改mysql属主给mysql用户
chown -R mysql:mysql /data/mysql # 修改data属主给mysql用户
chmod -R 755 /data/mysql /usr/local/mysql # 写入权限
8.安装初始化数据库
/usr/local/mysql/mysql-8.0.19-linux-glibc2.12-x86_64/bin/mysqld --user=mysql --basedir=/usr/local/mysql/mysql-8.0.19-linux-glibc2.12-x86_64 --datadir=/data/mysql/data --initialize
本步骤产生一个临时密码,需要到指定的日志文件/data/mysql/error.log查看
9.将mysql进程放入系统进程中
9.1 修改/usr/local/mysql/mysql-8.0.19-linux-glibc2.12-x86_64/support-files/mysql.server文件
basedir=/usr/local/mysql/mysql-8.0.19-linux-glibc2.12-x86_64
datadir=/data/mysql/data
mysqld_pid_file_path=/data/mysql/mysql.pid
9.2 拷贝到/etc/init.d/mysqld
cp /usr/local/mysql/mysql-8.0.19-linux-glibc2.12-x86_64/support-files/mysql.server /etc/init.d/mysql
10. 可使用下面此命令启停mysql
service mysql start
service mysql stop
service mysql restart
11.设置开机启动 在/etc/init.d文件夹下操作
cd /etc/init.d
chmod 755 /etc/init.d/mysql
chkconfig --add mysql
chkconfig --level 345 mysql on
service mysql restart
12. 启动mysql
12.1 service mysql start
12.2 查看步骤8产生的临时密码
less /data/mysql/error.log :)ng.j!5eGHt 就是生成的临时密码
2020-04-27T14:36:30.382988Z 5 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: :)ng.j!5eGHt
12.3 mysql -u root -p # 输入密码进入
13. 设置mysql环境变量
vim /etc/profile
export PATH=$PATH:/usr/local/mysql/mysql-8.0.19-linux-glibc2.12-x86_64/bin
source /etc/profile
14.重置mysql root用户密码
注意:mysql 5.7.9以后废弃了password字段和password()函数;authentication_string:字段表示用户密码。
14. 1 编辑MySQL配置文件my.cnf
vi /etc/my.cnf #编辑文件,找到[mysqld],在下面添加一行skip-grant-tables
[mysqld]
skip-grant-tables
14.2重启mysql服务
service mysqld restart
14.3 进入MySQL控制台
mysql -uroot -p #直接按回车 这是不需要密码
14.4 root用户authentication_string字段下有内容,先将其设置为空
use mysql;
update
user
set
authentication_string=
''
where
user
=
'root';
14.5 修改密码
ALTER
user
'root'
@
'localhost'
IDENTIFIED
BY
'root'
15.navicat连接不上处理
账号密码都正确,连接报错1251。OK 我们先来看看这个改动:
在MySQL 8.04前,执行:SET PASSWORD=PASSWORD('[新密码]');但是MySQL8.0.4开始,这样默认是不行的。因为之前,MySQL的密码认证插件是“mysql_native_password”,而现在使用的是“caching_sha2_password”。
so,我们这里需要再次修改一次root密码。
use mysql;
ALTER
USER
'root'
@
'localhost'
IDENTIFIED
WITH
mysql_native_password
BY
'新密码'
;
FLUSH
PRIVILEGES
;
16.无法远程连接的处理
16.1登陆mysql所在的OS查看root用户的host权限
use mysql
select host,user from user;
mysql> select host,user from user;
+-----------+------------------+
| host | user |
+-----------+------------------+
| localhost | mysql.infoschema |
| localhost | mysql.session |
| localhost | mysql.sys |
| localhost | root |
+-----------+------------------+
16.2root用户的访问权限是localhost,需要修改host为%
update user set host='%' where user='root';
flush privileges;
select host,user from user;
+-----------+------------------+
| host | user |
+-----------+------------------+
| % | root |
| localhost | mysql.infoschema |
| localhost | mysql.session |
| localhost | mysql.sys |
远程登陆OK。
17.创建存储过程或存储函数失败
异常:[Err] 1419 - You do not have the SUPER privilege and binary logging is enabled (you *might* want to use the less safe log_bin_trust_function_creators variable)
解决方法:
第一步,用root用户登录:mysql -u root -p
第二步,设置参数log_bin_trust_function_creators为1:set global log_bin_trust_function_creators = 1;
18.执行sql异常
[Err] 1055 - Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated column 'information_schema.PROFILING.SEQ' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
TODO: navicat连接才有这个问题,没有找到解决方法。