Linux Cenos7卸载mariadb安装mysql教程

1.卸载mariadb
yum remove mariadb -y

2.查找mariadb包
rpm -qa | grep mariadb
会找到 mariadb-libs-5.5.60-1.el7_5.x86_64 也删除：
yum remove mariadb-libs-5.5.60-1.el7_5.x86_64 -y

3.删除遗留文件
rm -rf /var/lib/mysql/

下载mysql:
1.下载rpm包
wget http://dev.mysql.com/get/mysql57-community-release-el6-7.noarch.rpm

2.安装rpm
rpm -ivh mysql57-community-release-el6-7.noarch.rpm

vim /etc/yum.repos.d/mysql-community.repo

[mysql-connectors-community]
name=MySQL Connectors Community
baseurl=http://repo.mysql.com/yum/mysql-connectors-community/el/6/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

[mysql-tools-community]
name=MySQL Tools Community
baseurl=http://repo.mysql.com/yum/mysql-tools-community/el/6/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

# Enable to use MySQL 5.5
[mysql55-community]
name=MySQL 5.5 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.5-community/el/6/$basearch/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

# Enable to use MySQL 5.6
[mysql56-community]
name=MySQL 5.6 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.6-community/el/6/$basearch/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

用mysql5.7，将baseurl=http://repo.mysql.com/yum/mysql-5.7-community/el/6/$basearch/改为baseurl=http://repo.mysql.com/yum/mysql-5.7-community/el/7/$basearch/

将gpgcheck=1改为gpgcheck=0

[mysql57-community]
name=MySQL 5.7 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.7-community/el/7/$basearch/
enabled=1
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

3.yum安装
yum install -y mysql-community-client

安装依赖文件net-tools
yum install -y net-tools

将我发的mysql-community-server的rpm包发送到虚拟机。 mysql-community-server
rpm -ivh mysql-community-server-5.7.26-1.el7.x86_64.rpm 安装

4.启动服务
systemctl start mysqld
systemctl enable mysqld

5.查看临时密码最后写是临时密码
   cat /var/log/mysqld.log | grep "temporary password"
   如果没有显示出密码，可以删除/var/lib/mysql，然后重新启动服务

   注意：然后通过 mysql -u root -p 回车，进入后将临时密码粘贴进去，回车就进去了。
6.修改密码

设置密码安全度：

set global validate_password_policy=LOW;
set global validate_password_length=4;
   alter user 'root'@'localhost' identified by '123456你自己得mysql密码';


7.打开远程连接
   update mysql.user set host='%' where user='root';

8.刷新授权
   flush privileges;

9.重启服务
   service mysqld restart

10.关闭防火墙
   自己查看
11.修改编码
   vim /etc/my.cnf
   在[mysqld]下添加:
       character-set-server=utf8
   重启服务

偶冬遇

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Linux Cenos7卸载mariadb安装mysql教程

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