CentOS7在线安装Mysql5.6

1、新创建的服务器，需要检测系统是否自带安装mysql

# yum list installed | grep mysql

2、如果发现有系统自带mysql，请卸载

# yum -y remove mysql-libs.x86_64

3、下载mysql yum源

# wget http://repo.mysql.com/mysql-community-release-el6-5.noarch.rpm

4、配置MySQL的安装源

# rpm -ivh mysql-community-release-el6-5.noarch.rpm

5、安装mysql 服务器命令

# yum install mysql-community-server

6、安装成功后启动

# service mysqld start

7、由于mysql刚刚安装完的时候，mysql的root用户的密码默认是空的，所以我们需要及时用mysql的root用户登录（第一次回车键，不用输入密码），并修改密码

# mysql
# show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| hive               |
| mysql              |
| performance_schema |
+--------------------+

# use mysql;
# show tables;
+---------------------------+
| Tables_in_mysql           |
+---------------------------+
| columns_priv              |
| db                        |
| event                     |
| func                      |
| general_log               |
| help_category             |
| help_keyword              |
| help_relation             |
| help_topic                |
| innodb_index_stats        |
| innodb_table_stats        |
| ndb_binlog_index          |
| plugin                    |
| proc                      |
| procs_priv                |
| proxies_priv              |
| servers                   |
| slave_master_info         |
| slave_relay_log_info      |
| slave_worker_info         |
| slow_log                  |
| tables_priv               |
| time_zone                 |
| time_zone_leap_second     |
| time_zone_name            |
| time_zone_transition      |
| time_zone_transition_type |
| user                      |
+---------------------------+

# select host,user from user;
+-----------+------+
| host      | user |
+-----------+------+
| 127.0.0.1 | root |
| ::1       | root |
| localhost |      |
| slave1    |      |
| slave1    | root |
+-----------+------+

# grant all privileges on *.* to 'root'@'%' identified by 'root' with grant option;
# select host,user from user;
+-----------+------+
| host      | user |
+-----------+------+
| %         | root |
| 127.0.0.1 | root |
| ::1       | root |
| localhost |      |
| slave1    |      |
| slave1    | root |
+-----------+------+
# delete from user where host != '%';
# select host,user from user;
+------+------+
| host | user |
+------+------+
| %    | root |
+------+------+

# flush privileges; 
# quit ;
# service mysqld restart ;
# mysql -uroot -proot;
# show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| hive               |
| mysql              |
| performance_schema |
+--------------------+
4 rows in set (0.00 sec)

8、查看mysql是否自启动,并且设置开启自启动命令

# chkconfig --list | grep mysqld
# chkconfig mysqld on

9、mysql安全设置

# mysql_secure_installation

Mysql5.7数据库初始密码查看及修改

自Mysql5.7初始密码不再默认为空！！！

1.查看初始密码：

[root@master]# grep 'temporary password'  /var/log/mysqld.log 
2017-03-12T12:25:43.090102Z 1 [Note] A temporary password is generated for root@localhost: h8&%pgp/+BB2

2.登录及修改密码：

[root@master]# mysql -uroot -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.7.17

Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show databases;
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.

3.修改密码：

mysql> alter user root@localhost identified by 'Mysql123#';
Query OK, 0 rows affected (0.00 sec)