Linux安装mysql5.7.20

服务器环境：centos7.1

1. mysql5.7的tar包：百度网盘地址
2. 操作之如果有默认数据库马瑞DB前先移除mariadb

yum -y remove mari*
rm -rf /var/lib/mysql/*

3. 使用ftp工具把tar包传输到usr/local/目录下
   

   

   image
   
   推荐工具Xftp 下载地址

4. 解压tar包

tar -zxvf mysql-5.7.22-linux-glibc2.12-x86_64.tar.gz

5. 更改文件名称

mv mysql-5.7.22-linux-glibc2.12-x86_64 mysql

6. 创建用户和用户组并赋予权限

groupadd mysql
useradd -r -g mysql mysql
chown -R mysql:mysql mysql/

7. 安装和初始化数据库

cd mysql
./bin/mysqld --initialize --user=mysql --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --lc_messages_dir=/usr/local/mysql/share --lc_messages=en_US

如果无错误继续,出现如下错误的

error

yum update
yum install -y libaio

8. 获取初始登录密码
   执行上一步操作后会在命令行输出 root@localhost: gFamcspKm2+u localhost: 后面的这一串便是你首次登陆mysql需要的初始密码
   如下图：
   
   

   passwd
9. 配置my.cnf

vim /etc/my.cnf

下面的粘贴进去

[mysqld]
character_set_server=utf8
init_connect='SET NAMES utf8'
basedir=/usr/local/mysql
datadir=/usr/local/mysql/data
socket=/tmp/mysql.sock
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

10. 启动服务

 cd /usr/local/mysql/bin/

./mysqld_safe --user=mysql &

11. 设置开机启动
    进入 /usr/local/mysql文件夹

cd /usr/local/mysql/support-files
cp mysql.server /etc/init.d/mysql

12. 使用service mysqld命令启动/停止服务

service mysql start/stop/restart

实在不行，用这个：

sudo ./support-files/mysql.server start

注意，5.7版本往上修改密码：

mysql -uroot -p你的密码
use mysql
update mysql.user set authentication_string=password('123456') where user='root' 

全局使用mysql

ln -s /usr/local/mysql-5.7.22/bin/mysql /usr/bin

新建用户远程连接mysql数据库

grant all on *.* to admin@'%' identified by '123456' with grant option; 
flush privileges;
允许任何ip地址(%表示允许任何ip地址)的电脑用admin帐户和密码(123456)来访问这个mysql server。
注意admin账户不一定要存在。

支持root用户允许远程连接mysql数据库

grant all privileges on *.* to 'root'@'%' identified by '123456' with grant option;
flush privileges;

13. 可能出现的错误搜集

• [x] 解决“ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (111)”

rm -rf /tmp/mysql.sock
cd /usr/local/mysql
sudo ./support-files/mysql.server start
mkdir /var/run/mysqld/
chown -R mysql.mysql /var/run/mysqld/

• [x] mysql> use mysql
  ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.

SET PASSWORD = PASSWORD('123456');

Query OK, 0 rows affected, 1 warning (0.00 sec)

• [x] 启动异常["ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)"]

解决办法：mysql服务未启动,启动就好了.

• [x] ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.

alter user user() identified by "123456";

-[x]服务器重启后连接mysql出现ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/data/mydata/mysql.sock' (111)类似

[mysqld]
character_set_server=utf8
init_connect='SET NAMES utf8'
basedir=/usr/local/mysql-5.7.22
datadir=/usr/local/mysql-5.7.22/data
socket=/tmp/mysql.sock
log-error=/var/log/mysqld.log
pid-file=/data/mydata/mysqld.pid
bind-address=0.0.0.0
socket = /data/mydata/mysql.sock
[client]
socket = /data/mydata/mysql.sock

把mysqld.pid的文件换个其他文件夹就行了