centos 7 安装mysql 5.7

1、进入官网下载 需要的mysql 版本 

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

 我这边下的是 mysql-5.7.27-linux-glibc2.12-x86_64.tar.gz

 

2、将mysql安装到/usr/local/mysql下

# 解压

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

# 移动

mv mysql-5.7.22-linux-glibc2.12-x86_64 /usr/local/

# 重命名

mv /usr/local/mysql-5.7.22-linux-glibc2.12-x86_64 /usr/local/mysql

3、新建data目录

mkdir /usr/local/mysql/data

4、新建mysql用户、mysql用户组

# mysql用户组

groupadd mysql

# mysql用户

useradd mysql -g mysql

5、将/usr/local/mysql的所有者及所属组改为mysql

chown -R mysql.mysql /usr/local/mysql

6、配置

/usr/local/mysql/bin/mysql_install_db --user=mysql --basedir=/usr/local/mysql/ --datadir=/usr/local/mysql/data

# 如果出现以下错误:

2018-07-14 06:40:32 [WARNING] mysql_install_db is deprecated. Please consider switching to mysqld --initialize
2018-07-14 06:40:32 [ERROR]   Child process: /usr/local/mysql/bin/mysqldterminated prematurely with errno= 32
2018-07-14 06:40:32 [ERROR]   Failed to execute /usr/local/mysql/bin/mysqld --bootstrap --datadir=/usr/local/mysql/data --lc-messages-dir=/usr/local/mysql/share --lc-messages=en_US --basedir=/usr/local/mysql
-- server log begin --

-- server log end --
 

# 则使用以下命令:

/usr/local/mysql/bin/mysqld --user=mysql --basedir=/usr/local/mysql/ --datadir=/usr/local/mysql/data --initialize
# 如果出现以下错误:
/usr/local/mysql/bin/mysqld: error while loading shared libraries: libnuma.so.1: cannot open shared object file: No such file or directory

# 则执行以下命令:

yum -y install numactl

# 如果出现以下错误:

root@bigdata-159:/usr/local/mysql# ./bin/mysqld -- defaults-file=/etc/my.cnf --initialize --user=mysql
./bin/mysqld: error while loading shared libraries: libaio.so.1: cannot open shared object file: No such file or directory
 


解决方法:

[[email protected] data]# yum install -y libaio  //安装后在初始化就OK了

# 完成后继续安装:

/usr/local/mysql/bin/mysqld --user=mysql --basedir=/usr/local/mysql/ --datadir=/usr/local/mysql/data --initialize
# 编辑/etc/my.cnf

 

进入到mysql目录,执行添加MySQL配置的操作

cp support-files/my-medium.cnf /etc/my.cnf
或:
cp support-files/my-default.cnf /etc/my.cnf
是否覆盖?按y 回车
[mysqld]
datadir=/usr/local/mysql/data
basedir=/usr/local/mysql
socket=/tmp/mysql.sock
user=mysql
port=3306
character-set-server=utf8
# 取消密码验证
skip-grant-tables
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
# skip-grant-tables
[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

7、开启服务

 

# 将mysql加入服务

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

# 开机自启

chkconfig mysql on

# 开启

service mysql start

8、设置密码

# 登录(由于/etc/my.cnf中设置了取消密码验证,所以此处密码任意)

/usr/local/mysql/bin/mysql -u root -p

# 操作mysql数据库

>>use mysql;

# 修改密码

>>update user set authentication_string=password('你的密码') where user='root';

>>flush privileges;

>>exit;

9、将/etc/my.cnf中的skip-grant-tables删除

10、登录再次设置密码(不知道为啥如果不再次设置密码就操作不了数据库了)

/usr/local/mysql/bin/mysql -u root -p

 >>ALTER USER 'root'@'localhost' IDENTIFIED BY '修改后的密码';

>>exit;

11、允许远程连接

这样就可以通过三方的可视化工具连接操作数据库了。

/usr/local/mysql/bin/mysql -u root -p

>>use mysql;

>>update user set host='%' where user = 'root';

>>flush privileges;

>>eixt;

防火墙操作:

5、查询、开放、关闭端口

复制代码
# 查询端口是否开放
firewall-cmd --query-port=8080/tcp
# 开放3306端口
firewall-cmd --permanent --add-port=3306/tcp
# 移除端口
firewall-cmd --permanent --remove-port=8080/tcp

#重启防火墙(修改配置后要重启防火墙)
firewall-cmd --reload

# 参数解释
1、firwall-cmd:是Linux提供的操作firewall的一个工具;
2、--permanent:表示设置为持久;
3、--add-port:标识添加的端口;

 

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