0.MySQL安装|卸载内置环境|配置官方yum源|安装mysql|登录mysql|设置配置文件(centos8.2)

卸载内置环境

检查是否有mariadb和mysql服务

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ps ajx |grep mariadb
ps ajx |grep mysql

停止mysql服务

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systemctl stop mysqld

找到mysql安装包

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rpm -qa | grep mysql

删除安装包

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rpm -qa | grep mysql | xargs yum -y remove

检查

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ls /etc/my.cnf

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ls /var/lib/mysql/

配置官方yum源

查看环境版本

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cat /etc/redhat-release

当前版本是8.2
Index of /232905

选择mysql57-community-release-el7版本

新建一个MySQL的路径

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mkdir MySQL

将下载的yum源上传进来

查看系统默认支持的yum源

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ls /etc/yum.repos.d/ -l

安装yum源

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rpm -ivh mysql57-community-release-el7.rpm

可以支持安装mysql

查找mysql相关内容

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yum list | grep mysql

安装mysql

先禁用mysql模块

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yum module disable mysql

再开始安装mysql

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yum -y install mysql-community-server

如果出现GPG问题

导入较新的密钥

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rpm --import https://repo.mysql.com/RPM-GPG-KEY-mysql-2022

安装成功

检查是否安装

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ls /etc/my.cnf

找到my.cnf文件

找mysql服务端的软件mysqld

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which mysqld

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which mysql

启动服务

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systemctl start mysqld.service

查看服务

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ps axj |grep mysqld

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netstat -ntlp

登录mysql

修改配置文件

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vim /etc/my.cnf

添加上一行

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skip-grant-tables

重启mysql服务

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systemctl restart mysqld

进入

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mysql -uroot -p

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show databases;

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quit;

退出

设置配置文件

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# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html

[mysqld]
#
# Remove leading # and set to the amount of RAM for the most important data
# 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

port=3306
character-set-server=utf8
default-storage-engine=innodb
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock

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

log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

skip-grant-tables

重启服务

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systemctl restart mysqld

查看服务

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netstat -nltp