linux下安装mysql8.0.x步骤

1.下载mysql

mysql官网：https://dev.mysql.com/downloads/mysql/

将下载的mysql上传打linux

2.解压并重命名

[root@rsyncClient local]# tar -zxvf mysql-8.0.18-el7-x86_64.tar.gz -C /usr/local/ 

[root@rsyncClient local]# mv mysql-8.0.18-el7-x86_64/ mysql

3.在mysql根目录下创建data目录，存放数据

[root@rsyncClientopt]# cd /usr/local/mysql/

[root@rsyncClient mysql]# mkdir data

4.创建mysql用户组和mysql用户

[root@rsyncClient local]# groupadd mysql

[root@rsyncClient local]# useradd -g mysql mysql

5.改变mysql目录权限

[root@rsyncClient local]# chown -R mysql.mysql /usr/local/mysql/

6.初始化数据库

[root@rsyncClient mysql]# bin/mysqld --initialize --user=mysql --basedir=/usr/local/mysql 
--datadir=/usr/local/mysql/data

7.配置mysql

在mysql/support-files创建文件my-default.cnf

[root@rsyncClient support-files]# cd /usr/local/mysql/support-files/
[root@rsyncClient support-files]# touch my-default.cnf

复制配置文件到/etc/my.cnf

[root@rsyncClient support-files]# cp -a ./my-default.cnf /etc/my.cnf
cp: overwrite ‘/etc/my.cnf’? y

编辑my.cnf

[client]
port=3306
socket=/tmp/mysql.sock

[mysqld]
port=3306
user=mysql
socket=/tmp/mysql.sock
basedir=/usr/local/mysql
datadir=/usr/local/mysql/data

8.配置环境变量

编辑 / etc/profile 文件

[root@rsyncClient mysql]# vim /etc/profile
#配置mysql环境变量
PATH=/data/mysql/bin:/data/mysql/lib:$PATH
export PATH
#让其生效
[root@rsyncClient mysql]# source /etc/profile
#看环境变量是否生效
[root@rsyncClient mysql]# echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin

9.启动mysql

[root@rsyncClient mysql]# systemctl start mysqld

启动失败报错1:

Job for mysql.service failed because the control process exited with error code. See "systemctl status mysql.service" and "journalctl -xe" for details.

解决方案:

[root@rsyncClient ~]# chown mysql:mysql -R /usr/local/mysql/

启动失败报错2:

[root@rsyncClient mysql]# service mysql start
/etc/init.d/mysql: ./bin/my_print_defaults: /lib/ld-linux.so.2: bad ELF interpreter: No such file or 
directory  Starting MySQL. ERROR! The server quit without 
updating PID file (/var/lib/mysql/rsyncClient.pid).
去这个目录下面查看 cat/usr/local/mysql/data/rsyncClient.err错误，对应的的解决，这里错误是因为my.conf配置错误

 启动失败报错3:

mysql: error while loading shared libraries: libncurses.so.5: cannot open shared object file:
 No such file or directory
[root@rsyncClient init.d]# yum install libncurses.so.5
以这个为例，如果缺少这样依赖，直接用yum安装

启动失败报错4:

[root@rsyncClient data]# mysql -uroot -p
Enter password:
ERROR 2059 (HY000): Authentication plugin 'caching_sha2_password' cannot be loaded: 
/usr/lib/mysql/plugin/caching_sha2_password.so: cannot open shared object file: No such file or directory
身份验证插件不能加载

解决办法:

[root@rsyncClient lib]# vim /etc/my.cnf
在这个[mysqld]下添加一行：
default_authentication_plugin=mysql_native_password
如果忘记了密码在加上:
skip-grant-tables(跳过密码验证)等设置了密码就去掉

10 使用systemctl命令启动关闭mysql服务

启动mysql服务：

#systemctl start mysqld.service

停止mysql服务

#systemctl stop mysqld.service

重启mysql服务

#systemctl restart mysqld.service

查看mysql服务当前状态

#systemctl status mysqld.service

设置mysql服务开机自启动

#systemctl enable mysqld.service

停止mysql服务开机自启动

#systemctl disable mysqld.service

11.mysql的基本操作

# 使用mysql客户端连接mysql

>/usr/local/mysql/bin/mysql -u root -p password

修改mysql的默认初始化密码

> alter user 'root'@'localhost' identified by 'root';

# 创建用户 CREATE USER '用户名称'@'主机名称' INDENTIFIED BY '用户密码'

> create user 'yehui'@'localhost' identified by 'yehui';

#给所有远程登录的进行授权，此方式已经报错了

> grant all privileges on *.*  to  'root'@'%'  identified by 'root'  with grant option;

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'identified by 'root'  with grant option' at line 1

# 修改root用户可以远程连接

> update mysql.user set host='%' where user='root';

 

# 授予权限 grant 权限 on 数据库.表 to '用户名'@'登录主机' [INDENTIFIED BY '用户密码'];

> grant replication slave on *.* to 'yehui'@'localhost';

#刷新

>flush privileges;

#权限问题可以参考https://www.cnblogs.com/php-linux/p/11561300.html

 12.防火墙问题

[root@rsyncClient data]# firewall-cmd --permanent --zone=public --add-port=3306/tcp  #允许访问
success
[root@rsyncClient data]# firewall-cmd --reload  #重新加载
success

[root@rsyncClient data]# firewall-cmd --permanent --zone=public --query-port=3306/tcp  #查看是否开通访问权限
yes