|NO.Z.00001|——————————|^^ 构建 ^^|——|Mysql.V5.7.35|

一、centos7安装mysql5.7.27

### --- 下载 MySQL yum包

wget http://repo.mysql.com/mysql57-community-release-el7-10.noarch.rpm

### --- 安装MySQL源

rpm -Uvh mysql57-community-release-el7-10.noarch.rpm

### --- 安装MySQL服务端,需要等待一些时间

yum install -y mysql-community-server

### --- 启动MySQL

systemctl start mysqld.service

### --- 检查是否启动成功

systemctl status mysqld.service

二、mysql授权

### --- 获取临时密码，MySQL5.7为root用户随机生成了一个密码

grep 'temporary password' /var/log/mysqld.log 

### --- 通过临时密码登录MySQL，进行修改密码操作
### --- 使用临时密码登录后，不能进行其他的操作，否则会报错，这时候我们进行修改密码操作

mysql -uroot -p

### --- 因为MySQL的密码规则需要很复杂，我们一般自己设置的不会设置成这样，所以我们全局修改一下
mysql> set global validate_password_policy=0;
mysql> set global validate_password_length=1;

### --- 这时候我们就可以自己设置想要的密码了
ALTER USER 'root'@'localhost' IDENTIFIED BY 'yourpassword';

### --- 授权其他机器远程登录

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

### --- 开启开机自启动：先退出mysql命令行，然后输入以下命令

systemctl enable mysqld
systemctl daemon-reload

### --- 设置MySQL的字符集为UTF-8，令其支持中文

vim /etc/my.cnf
#改成如下,然后保存
 
# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html
 
[mysql]
default-character-set=utf8
 
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
default-storage-engine=INNODB
character_set_server=utf8
 
symbolic-links=0
 
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

### --- 重启一下MySQL,令配置生效

systemctl restart mysqld

### --- 防火墙开放3306端口

firewall-cmd --state
firewall-cmd --zone=public --add-port=3306/tcp --permanent
firewall-cmd --reload

三、卸载mysql

### --- 卸载MySQL仓库
### --- 一开始的时候我们安装的yum，每次yum操作都会更新一次，耗费时间，我们把他卸载掉

rpm -qa | grep mysql
yum -y remove mysql57-community-release-el7-10.noarch

### --- 数据库的操作
### --- 查看mysql是否启动：service mysqld status

~~~		启动mysql：service mysqld start
~~~		停止mysql：service mysqld stop
~~~		重启mysql：service mysqld restart
### --- 查看临时密码：grep password /var/log/mysqld.log

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附录一：

### --- 辅助资料：

https://www.cnblogs.com/jinghuyue/p/11565564.html

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Walter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart

                                                                                                                                                   ——W.S.Landor

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