linux安装mysql

官网下载tar.gz

解压 tar -zxvf  xxx.tar.gz

改名,不然名字太长了

mv  xxx   mysql

进入etc下创建my.cnf

cd /etc

touch my.cnf

粘贴以下内容

[mysqld]
bind-address=0.0.0.0
port=3306
user=mysql
basedir=/opt/mysql
datadir=/opt/mysql/data
socket=/tmp/mysql.sock
log-error=/opt/mysql/mysql.err
pid-file=/opt/mysql/mysql.pid
#character config
character_set_server=utf8mb4
symbolic-links=0
explicit_defaults_for_timestamp=true
[client]
default-character-set=utf8
[mysql]
default-character-set=utf8

初始化

进入/opt/mysql/bin目录下执行

./mysqld --defaults-file=/etc/my.cnf --basedir=/opt/mysql/ --datadir=/opt/mysql/data --user=mysql --initialize

交给systemctl管理。

 cd /etc/systemd/system

创建mysql.service

[Unit]
Description=MySQL Server
After=network.target

[Service]
User=mysql
Group=mysql
ExecStart=/opt/mysql/bin/mysqld --defaults-file=/etc/my.cnf
ExecStop=/opt/mysql/bin/mysqladmin shutdown
Restart=always
RestartSec=5

[Install]
WantedBy=multi-user.target

重启策略

systemctl daemon-reload

查看root密码

opt/mysql/mysql.err文件中。找到

A temporary password is generated for root@localhost: VV,VXywIg3P&

冒号后面的就是临时密码。

回到mysql/bin目录下，执行

./bin/mysql -uroot -p

输入临时密码。然后连接上以后，修改root密码

ALTER USER 'root'@'localhost' IDENTIFIED BY '新密码';

此时root密码修改完毕。但是root只能在localhost上登陆。

设置root可远程登陆

两种方式：

1.重新创建一个

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

2.修改原来的
 

UPDATE mysql.user SET Host='%' WHERE User='root' AND Host='localhost';
FLUSH PRIVILEGES;

重新服务