Linux Cenos7卸载mariadb安装mysql教程

ゝ一纸荒年。 2022-01-27 16:19 653阅读 0赞

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