#卸载系统自带的Mariadb
 

[root@master ~]# rpm -qa|grep mariadb

mariadb-libs-5.5.44-2.el7.centos.x86_64

[root@master ~]# rpm -e --nodeps mariadb-libs-5.5.44-2.el7.centos.x86_64

#检查mysql是否存在

[root@master ~]# rpm -qa | grep mysql

[root@master ~]#

#下载MySQL压缩包

点击打开链接

 

 

#解压并并改名为mysql，在此文件夹下新建data目录

[root@master apps]# tar -zxvf mysql-5.7.22-linux-glibc2.12-x86_64.tar.gz 

[root@master apps]# mv mysql-5.7.22-linux-glibc2.12-x86_64 mysql

[root@master apps]# cd mysql

[root@master apps]# mkdir data

#在etc下新建配置文件my.cnf，并在该文件内添加以下配置

[root@master ~]#vi /etc/my.cnf

[mysql]

#设置mysql客户端默认字符集

default-character-set=utf8 

[mysqld]

skip-name-resolve

#设置3306端口

port = 3306 

# 设置mysql的安装目录

basedir=/apps/mysql/

# 设置mysql数据库的数据的存放目录

datadir=/apps/mysql/data

# 允许最大连接数

max_connections=200

# 服务端使用的字符集默认为8比特编码的latin1字符集

character-set-server=utf8

# 创建新表时将使用的默认存储引擎

default-storage-engine=INNODB 

lower_case_table_names=1

max_allowed_packet=16M

log-error = /apps/mysql/data/error.log

pid-file = /apps/mysql/data/mysql.pid

user = root

tmpdir = /tmp

socket = /tmp/mysql.sock

<span style="background-color:rgb(204,204,204);"></span>

#安装和初始化

[root@master ~]cd /apps/mysql

[root@master mysql]bin/mysql_install_db --user=root --basedir=/apps/mysql --datadir=/apps/mysql/data

[root@master mysql]cp ./support-files/mysql.server /etc/init.d/mysqld

[root@master mysql]chown 777 /etc/my.cnf 

[root@master mysql]chmod +x /etc/init.d/mysqld

#启动服务

[root@master mysql]# /etc/init.d/mysqld start

Starting MySQL. SUCCESS! 

 

#查看端口运行情况（3306）

[root@master mysql]# netstat -ntlp

Active Internet connections (only servers)

Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    

tcp        0      0 0.0.0.0:111             0.0.0.0:*               LISTEN      1/systemd           

tcp        0      0 192.168.122.1:53        0.0.0.0:*               LISTEN      1326/dnsmasq        

tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      983/sshd            

tcp        0      0 127.0.0.1:631           0.0.0.0:*               LISTEN      986/cupsd           

tcp6       0      0 :::111                  :::*                    LISTEN      1/systemd           

tcp6       0      0 :::22                   :::*                    LISTEN      983/sshd            

tcp6       0      0 ::1:631                 :::*                    LISTEN      986/cupsd           

tcp6       0      0 :::3306                 :::*                    LISTEN      16421/mysqld 

 

#登录MySQL

#查看生成的初始密码

[root@master mysql]# cat /root/.mysql_secret 

# Password set for user 'root@localhost' at 2018-07-06 10:36:35 

#Lws4rXsnhbA

 

#密码登录（可能会报错）

[root@master mysql]# mysql -u root -p

Enter password: 

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

 

#如果登录成功，显示成这样

[root@master ~]# mysql -u root -p

Enter password: 

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 5

Server version: 5.7.22 MySQL Community Server (GPL)

 

Copyright (c) 2000, 2018, 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> 

============================================================================

#安装过程中可能出现的错误

错误1：解决严格按照下面配置进行（/tmp/mysql.sock）位置至关重要

 

ERROR! The server quit without updating PID file

[root@master mysql]# /etc/init.d/mysqld start

Starting MySQL.Logging to '/apps/mysql/data/master.hadoop.err'.

 ERROR! The server quit without updating PID file (/apps/mysql/data/master.hadoop.pid)

[mysql]

# 设置mysql客户端默认字符集

default-character-set=utf8 

[mysqld]

skip-name-resolve

#设置3306端口

port = 3306 

# 设置mysql的安装目录

basedir=/apps/mysql/

# 设置mysql数据库的数据的存放目录

datadir=/apps/mysql/data

# 允许最大连接数

max_connections=200

# 服务端使用的字符集默认为8比特编码的latin1字符集

character-set-server=utf8

# 创建新表时将使用的默认存储引擎

default-storage-engine=INNODB 

lower_case_table_names=1

max_allowed_packet=16M

log-error = /apps/mysql/data/error.log

pid-file = /apps/mysql/data/mysql.pid

user = root

tmpdir = /tmp

socket = /tmp/mysql.sock

然后：删除data目录中的所有文件，重新初始化

[root@master mysql]# rm -rf data/*

[root@master mysql]# bin/mysql_install_db --user=mysql --basedir=/apps/mysql/ --datadir=/apps/mysql/data/

错误2：（mysql_install_db: [ERROR] Found option without preceding group in config file /etc/my.cnf at line 1!）

 

[root@master mysql]# bin/mysql_install_db --user=mysql --basedir=/apps/mysql/ --datadir=/apps/mysql/data/

mysql_install_db: [ERROR] Found option without preceding group in config file /etc/my.cnf at line 1!

mysql_install_db: [ERROR] Fatal error in defaults handling. Program aborted!

[root@master mysql]# vi /etc/my.cnf(该文件有语法错误，修改)

============================================================================

 

#如果再登录中出现了问题

#查看生成的初始密码

[root@master mysql]# cat /root/.mysql_secret 

# Password set for user 'root@localhost' at 2018-07-06 10:36:35 

#Lws4rXsnhbA

 

#密码登录（可能会报错）

[root@master mysql]# mysql -u root -p

Enter password: 

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

 

解决办法：

 

[root@master mysql]# service mysqld stop

Shutting down MySQL.. SUCCESS! 

 

#报错解决方法

[root@master mysql]# vi /etc/my.cnf

在[mysqld]的段中加上一句：skip-grant-tables 保存并且退出vi。

 

[root@master mysql]# service mysqld start

Starting MySQL. SUCCESS! 

[root@master mysql]# mysql

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 2

Server version: 5.7.22 MySQL Community Server (GPL)

 

Copyright (c) 2000, 2018, 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> 

 

登录并修改MySQL的root密码

mysql> USE mysql ; 

mysql> update user set password=password("*******") where user="*******";  #修改密码报错

ERROR 1054 (42S22): Unknown column 'password' in 'field list'

mysql> update mysql.user set authentication_string=password('*******') where user='*******';  #修改密码成功

Query OK, 1 row affected, 1 warning (0.00 sec)

Rows matched: 1  Changed: 1  Warnings: 1 

mysql> flush privileges ; 

mysql> exit

# vi /etc/my.cnf

将刚才在[mysqld]的段中加上的skip-grant-tables删除 

保存并且退出vi。

重新启动mysqld 

 

登陆后重要的一步

 

否则报错：ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.

解决办法：

 

安装完mysql 之后，登陆以后，不管运行任何命令，总是提示这个

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

 

step 1: SET PASSWORD = PASSWORD('your new password');

 

step 2: ALTER USER 'root'@'localhost' PASSWORD EXPIRE NEVER;

step 3: flush privileges;

完成以上三步退出再登，使用新设置的密码就行了，后两部原样设置即可

mysql> SET PASSWORD = PASSWORD('******');

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

 

mysql> ALTER USER 'root'@'localhost' PASSWORD EXPIRE NEVER;

Query OK, 0 rows affected (0.00 sec)

mysql> flush privileges;

Query OK, 0 rows affected (0.01 sec)

mysql> use mysql

Reading table information for completion of table and column names

You can turn off this feature to get a quicker startup with -A

Database changed

mysql> show databases

    -> ;

+--------------------+

| Database           |

+--------------------+

| information_schema |

| mysql              |

| performance_schema |

| sys                |

+--------------------+

4 rows in set (0.00 sec)

mysql> exit

Bye

[root@master ~]#