Mysql5.7 ,Linux 环境安装

1、下载mysql-5.7.8-rc-linux-glibc2.5-x86_64.tar.gz

链接:https://pan.baidu.com/s/1z4z8g6hzJWtNSqX96HxR8Q 
   提取码:mkp8 

2、解压安装包:
进入安装包所在目录,执行命令:
tar -xzvf mysql-5.7.8-rc-linux-glibc2.5-x86_64.tar.gz

3、复制解压后的mysql目录到系统的本地软件目录:
注意:/opt/modules/mysql 必须是不存在的目录,如果mysql文件夹存在,就把mysql-5.7.8-rc-linux-glibc2.5-x86_64文件里面的数据复制进去。
执行命令:
cp mysql-5.7.8-rc-linux-glibc2.5-x86_64 /opt/modules/mysql -r
注意:目录结尾不要加/

chmod 777 -R /opt/modules

4、添加系统mysql组和mysql用户:
执行命令:groupadd mysql和useradd -r -g mysql mysql

5、安装数据库:
进入安装mysql软件目录:执行命令 cd /opt/modules/mysql
修改当前目录拥有者为mysql用户:执行命令 chown -R mysql:mysql ./
安装数据库:执行命令

./bin/mysqld --user=mysql --user=mysql --basedir=/opt/modules/mysql --datadir=/opt/modules/mysql/data/ --initialize 




修改当前目录拥有者为root用户:执行命令 chown -R root:root ./
修改当前data目录拥有者为mysql用户:执行命令 chown -R mysql:mysql data
到此数据库安装完毕

6、复制mysql服务启动配置文件
cp /opt/modules/mysql/support-files/my-default.cnf /etc/my.cnf

更改配置文件:
	-------------------------------------------------------------------
		basedir = /opt/modules/mysql
		datadir = /opt/modules/mysql/data/
		port = 3306
		# server_id = .....
		socket =  /tmp/mysql.sock

		# Remove leading # to set options mainly useful for reporting servers.
		# The server defaults are faster for transactions and fast SELECTs.
		# Adjust sizes as needed, experiment to find the optimal values.


		innodb_buffer_pool_size=6G

		join_buffer_size = 256M
		sort_buffer_size = 8M
		key_buffer_size = 8M

		max_allowed_packet = 100M
	
	-------------------------------------------------------------------

7、复制mysql服务启动脚本及加入PATH路径
cp support-files/mysql.server /etc/init.d/mysqld

vi /etc/profile 

	MYSQL_HOME=/opt/modules/mysql

	export PATH=$MYSQL_HOME/bin:$MYSQL_HOME/lib:$PATH
	
 

source /etc/profile  

8、启动mysql服务并加入开机自启动(可选这个步骤,以后可以自己启动的)
service mysqld start
chkconfig --level 35 mysqld on

9、检查mysql服务是否启动
ss -lntp | grep 3306

10、修改mysql的root用户密码

	MySQL5.7在安装完后,第一次启动时,会在root目录下生产一个随机的密码,文件名为.mysql_secret(隐藏文件)
	vi /root/.mysql_secret
	
	mysql -uroot -p
	
	e+o?VkPu%69j
	
	登录时需要用随机密码登录,然后通过以下命令修改密码  --不需要重启

	SET PASSWORD = PASSWORD('root');

11、开启远程连接
mysql无法链接。。 !!!!
java.sql.SQLException: Access denied for user ‘root’@‘localhost’ (using password: YES)
1、mysql -u root -poperation123
2、use mysql;
3、select user,host from user;
4、select user,host from user where host=’%’;
如果数据为空则:update user set host=’%’ where host = ‘127.0.0.1’; (切记 root用户不要清空啊!!!! )
如果数据为空则:update user set host=’%’ where user = ‘root’; (切记 root用户不要清空啊!!!! )
5、select user,host from user where host!=’%’;
6、delete from user where host!=’%’;
7、select user,host from user;

	8.Ctrl-C -- exit!
	9、su - root
	10、service mysqld restart

错误异常:
ERROR 2002 (HY000): Can’t connect to local MySQL server through socket ‘/tmp/mysql.sock’
解决方法:

由于mysql 默认的mysql.sock 是在/var/lib/mysql/mysql.sock,但linux系统总是去/tmp/mysql.sock查找,所以会报错
[root@localhost ~]# find / -name mysql.sock
/var/lib/mysql/mysql.sock
	 
	1.直接指定mysql通道
	 
	[root@localhost ~]# mysql --socket=/var/lib/mysql/mysql.sock
	Welcome to the MySQL monitor.  Commands end with ; or /g.
	Your MySQL connection id is 2 to server version: 5.0.22
	Type 'help;' or '/h' for help. Type '/c' to clear the buffer.
	mysql>
	 
	2. 创建符号连接:
	 
	为mysql.sock增加软连接(相当于windows中的快捷方式)。
	ln -s /var/lib/mysql/mysql.sock /tmp/mysql.sock

	eg:
	root@localhost ~]# mysql
	ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)
	[root@localhost ~]# ln -s /var/lib/mysql/mysql.sock /tmp/mysql.sock
	[root@localhost ~]# mysql
	Welcome to the MySQL monitor.  Commands end with ; or /g.
	Your MySQL connection id is 3 to server version: 5.0.22
	Type 'help;' or '/h' for help. Type '/c' to clear the buffer.
	mysql>

卸载msyql
1、查找以前是否装有mysql
命令:rpm -qa|grep -i mysql
可以看到mysql的两个包:
mysql-4.1.12-3.RHEL4.1
mysqlclient10-3.23.58-4.RHEL4.1
2、删除mysql
删除命令:rpm -e --nodeps 包名
( rpm -ev mysql-4.1.12-3.RHEL4.1 )
3、删除老版本mysql的开发头文件和库
find / -name mysql
查找结果如下:
[root@localhost ~]# find / -name mysql

		删除对应的mysql目录
		rm -rf /var/lock/subsys/mysql
		rm -rf /opt/modules/mysql
		rm -rf /home/hadoop/temp/mysql-5.7.8-rc-linux-glibc2.5-x86_64
		rm -rf /opt/modules/mysql

4、查看mysql进程 使用 (kill -9) 删除
	ps -ef|grep mysqld

	kill -9 17614









忘记mysql root命令
1.关闭正在运行的MySQL
2.启动MySQL的安全模式,命令如下:
  mysqld_safe --skip-grant-tables & 
3 完成以后就可以不用密码进入MySQL了
  mysql -u root -p
  
  >use mysql  
>update mysql.user set authentication_string=password('msstar') where user='root'
>flush privileges; 


如果开启远程链接的时候,提示密码过期的话,重新设置。
SET PASSWORD = PASSWORD('msstar');
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