MySQL yum 在线与本地包方式安装

以下实践操作是在 liux-centos7 上安装配置

先检测是否安装mysql，然后在拆卸mysql

# 检测
[root@localhost ~]# yum list installed | grep mysql

# 拆卸
[root@localhost ~]# yum -y remove mysql-libs.x86_64

1、官网下载包

https://dev.mysql.com/downloads/repo/yum/

2、安装yum mysql 仓库

下载地址: https://repo.mysql.com//mysql57-community-release-el7-11.noarch.rpm

[root@localhost ~]# yum install -y https://repo.mysql.com//mysql57-community-release-el7-11.noarch.rpm

#查看yum mysql仓库

[root@localhost ~]# ls /etc/yum.repos.d/

2.1、如果想使用本地rpm文件，则修改文件 mysql.community.repo文件

[root@localhost ~]# cat /etc/yum.repos.d/

　[root@localhost ~]# vim /etc/yum.repos.d/mysql-community.repo

# 修改配置文件
 [mysql57-community]
  name=MySQL 5.7 Community Server
  baseurl=http://repo.mysql.com/yum/mysql-5.7community/el/7/$basearch/  #这里修改成本地文件路径
  enabled=1  # 1-开启 0-关闭
  gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql # 设置成0不用检查

3、查看过滤mysql包

[root@localhost ~]# yum list | grep "mysql-community"

mysql-community-server.x86_64 5.7.19-1.el7 mysql57-community
mysql-community-client.x86_64 5.7.19-1.el7 mysql57-community

4、安装服务端和客户端

[root@localhost ~]# yum install mysql-community-client mysql-community-server -y
或
 yum install mysql-community-server

5、启动mysql服务、查看服务、重启服务器

#启动服务
[root@localhost ~]# systemctl start mysqld

　#查看服务

　[root@localhost ~]# systemctl status mysqld

mysqld.service - MySQL Server
Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
Active: active (running) since 三 2019-01-02 20:13:46 CST; 18s ago #running 开启
Docs: man:mysqld(8)
http://dev.mysql.com/doc/refman/en/using-systemd.html
Process: 8711 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid $MYSQLD_OPTS (code=exited, status=0/SUCCESS)
Process: 8632 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)
Main PID: 8714 (mysqld)
Tasks: 27
CGroup: /system.slice/mysqld.service
└─8714 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid

#重启服务

[root@localhost ~]# systemctl restart mysqld

6、登录mysql

#查看密码
[root@localhost ~]# grep 'temporary password' /var/log/mysqld.log
[root@localhost ~]# mysql -uroot -p
Enter password:

7、关闭密码策略以及修改密码；详细参考：https://www.cnblogs.com/zhi-leaf/p/5994478.html

[root@localhost ~]# set global validate_password_policy=0;
[root@localhost ~]# set global validate_password_length=1;

[root@localhost ~]# ALTER USER 'root'@'localhost' IDENTIFIED BY '123456';

8、重启服务并登录

[root@localhost ~]# systemctl restart mysqld

[root@localhost ~]# mysql -uroot -p

 Enter password:123456

9、授权远程登录并刷新权限

GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'your_root_password' WITH GRANT OPTION;  
FLUSH PRIVILEGES;

10、关闭防火墙或者添加3306端口以下是关闭防火墙方式

[root@localhost ~]# systemctl stop firewalld                  #关闭当前防火墙
[root@localhost ~]# systemctl disable firewalld               #开机自动关闭

11、默认配置文件路径：

配置文件：/etc/my.cnf 
日志文件：/var/log/mysqld.log 
服务启动脚本：/usr/lib/systemd/system/mysqld.service 
socket文件：/var/run/mysqld/mysqld.pid

　#(a)数据库目录
　 /var/lib/mysql/

　#(b)配置文件
　　/usr/share /mysql（mysql.server命令及配置文件）

　#(c)相关命令
　　/usr/bin（mysqladmin mysqldump等命令）

　#(d)启动脚本
　　/etc/rc.d/init.d/（启动脚本文件mysql的目录）

如果忘记root密码，则按如下操作恢复

#在[mysqld]的段中加上一句：skip-grant-tables 保存并且退出vi。

mysql  -u root

update mysql.user set authentication_string=password('123qwe') where user='root' and Host = 'localhost';

flush privileges

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