1、mysql官网下载安装包,官网地址:www.mysql.com

[root@seiang software]# ll

total 580020

-rw-r--r--. 1 root root 593940480 Mar 25 18:57 mysql-5.7.21-1.el7.x86_64.rpm-bundle.tar

2、解压

[root@seiang software]# tar xvf mysql-5.7.21-1.el7.x86_64.rpm-bundle.tar

mysql-community-embedded-devel-5.7.21-1.el7.x86_64.rpm

mysql-community-minimal-debuginfo-5.7.21-1.el7.x86_64.rpm

mysql-community-common-5.7.21-1.el7.x86_64.rpm

mysql-community-libs-compat-5.7.21-1.el7.x86_64.rpm

mysql-community-embedded-compat-5.7.21-1.el7.x86_64.rpm

mysql-community-server-minimal-5.7.21-1.el7.x86_64.rpm

mysql-community-client-5.7.21-1.el7.x86_64.rpm

mysql-community-server-5.7.21-1.el7.x86_64.rpm

mysql-community-embedded-5.7.21-1.el7.x86_64.rpm

mysql-community-test-5.7.21-1.el7.x86_64.rpm

mysql-community-devel-5.7.21-1.el7.x86_64.rpm

mysql-community-libs-5.7.21-1.el7.x86_64.rpm

3、全部安装,出现如下的报错

[root@seiang software]# rpm -ivh *.rpm

warning: mysql-community-client-5.7.21-1.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY

error: Failed dependencies:

        mariadb-libs is obsoleted by mysql-community-libs-5.7.21-1.el7.x86_64

        mariadb-libs is obsoleted by mysql-community-libs-compat-5.7.21-1.el7.x86_64

        perl(Data::Dumper) is needed by mysql-community-test-5.7.21-1.el7.x86_64

        perl(JSON) is needed by mysql-community-test-5.7.21-1.el7.x86_64

4、如上的报错,由于centos 7默认是mariadb数据库,再去安装mysql之前要先下载mariadb

[root@seiang software]# rpm -qa | grep mariadb

mariadb-libs-5.5.41-2.el7_0.x86_64

[root@seiang software]# rpm -e mariadb-libs-5.5.41-2.el7_0.x86_64

error: Failed dependencies:

libmysqlclient.so.18()(64bit) is needed by (installed) postfix-2:2.10.1-6.el7.x86_64

libmysqlclient.so.18(libmysqlclient_18)(64bit) is needed by (installed) postfix-2:2.10.1-6.el7.x86_64

由于存在依赖关系,强制卸载

[root@seiang software]# rpm -e --nodeps mariadb-libs-5.5.41-2.el7_0.x86_64

5、安装mysql-server,出现报错

[root@seiang software]# rpm -ivh mysql-community-server-5.7.21-1.el7.x86_64.rpm

warning: mysql-community-server-5.7.21-1.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY

error: Failed dependencies:

        mysql-community-client(x86-64) >= 5.7.9 is needed by mysql-community-server-5.7.21-1.el7.x86_64

        mysql-community-common(x86-64) = 5.7.21-1.el7 is needed by mysql-community-server-5.7.21-1.el7.x86_64

6、根据提示,要先安装mysql-community-common和mysql-community-client包

[root@seiang software]# rpm -ivh mysql-community-common-5.7.21-1.el7.x86_64.rpm

warning: mysql-community-common-5.7.21-1.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY

Preparing...                          ################################# [100%]

Updating / installing...

1:mysql-community-common-5.7.21-1.e################################# [100%]

 7、安装mysql-client包,出现如下的报错

[root@seiang software]# rpm -ivh mysql-community-client-5.7.21-1.el7.x86_64.rpm

warning: mysql-community-client-5.7.21-1.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY

error: Failed dependencies:

        mysql-community-libs(x86-64) >= 5.7.9 is needed by mysql-community-client-5.7.21-1.el7.x86_64

8、根据提示先安装 mysql-community-libs包

[root@seiang software]# rpm -ivh mysql-community-libs-5.7.21-1.el7.x86_64.rpm

warning: mysql-community-libs-5.7.21-1.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY

Preparing...                          ################################# [100%]

Updating / installing...

1:mysql-community-libs-5.7.21-1.el7################################# [100%]

9、再次尝试安装mysql-client

[root@seiang software]# rpm -ivh mysql-community-client-5.7.21-1.el7.x86_64.rpm

warning: mysql-community-client-5.7.21-1.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY

Preparing...                          ################################# [100%]

Updating / installing...

1:mysql-community-client-5.7.21-1.e################################# [100%]

10、最后安装mysql-server

[root@seiang software]# rpm -ivh mysql-community-server-5.7.21-1.el7.x86_64.rpm

warning: mysql-community-server-5.7.21-1.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY

Preparing...                          ################################# [100%]

Updating / installing...

1:mysql-community-server-5.7.21-1.e################################# [100%]

11、查看mysql的服务

[root@seiang software]# systemctl status mysqld.service

mysqld.service - MySQL Server

Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled)

Active: inactive (dead)

Docs: man:mysqld(8)

http://dev.mysql.com/doc/refman/en/using-systemd.html

12、启动mysql服务

[root@seiang software]# systemctl start mysqld.service

[root@seiang software]#

[root@seiang software]# systemctl status mysqld.service

mysqld.service - MySQL Server

Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled)

Active: active (running) since Mon 2018-03-26 09:26:04 CST; 2s ago

Docs: man:mysqld(8)

http://dev.mysql.com/doc/refman/en/using-systemd.html

Process: 2113 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid $MYSQLD_OPTS (code=exited, status=0/SUCCESS)

Process: 2034 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)

Main PID: 2116 (mysqld)

CGroup: /system.slice/mysqld.service

鈹斺攢2116 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid

Mar 26 09:25:54 seiang systemd[1]: Starting MySQL Server...

Mar 26 09:26:04 seiang systemd[1]: Started MySQL Server.

13、mysql服务启动成功,首先使用临时的密码进行登录,查看临时密码

[root@seiang software]#  grep "password" /var/log/mysqld.log

2018-03-25T11:18:09.770923Z 1 [Note] A temporary password is generated for root@localhost: &)2KIh?M3hr7

2018-03-25T11:19:39.853663Z 2 [Note] Access denied for user 'root'@'localhost' (using password: YES)

2018-03-25T11:22:20.996230Z 3 [Note] Access denied for user 'root'@'localhost' (using password: NO)

2018-03-25T11:24:31.219087Z 0 [Note] Shutting down plugin 'validate_password'

2018-03-25T11:24:33.062278Z 0 [Note] Shutting down plugin 'sha256_password'

2018-03-25T11:24:33.062286Z 0 [Note] Shutting down plugin 'mysql_native_password'

2018-03-26T01:25:57.938742Z 1 [Note] A temporary password is generated for root@localhost: v,esvf2?oj?T

14、使用临时密码登录,然后修改root的密码

[root@seiang software]# mysql -uroot -pv,esvf2?oj?T

mysql: [Warning] Using a password on the command line interface can be insecure.

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

Your MySQL connection id is 2

Server version: 5.7.21

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>

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'beijing';

ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'qcloud@2018';

ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

两次修改都提示相同的错误:ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

下面是官方文档,对于该问题的解释:

https://dev.mysql.com/doc/refman/5.7/en/validate-password.html

上述报错的原因:其实与validate_password_policy的值有关。

validate_password_policy有以下取值:

默认是1,即MEDIUM,所以刚开始设置的密码必须符合长度,且必须含有数字,小写或大写字母,特殊字符。

解决方法:

修改validate_password_policy参数的值

mysql> set global validate_password_policy=0;

Query OK, 0 rows affected (0.00 sec)

mysql> select @@validate_password_length;

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

| @@validate_password_length |

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

|                 8 |

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

1 row in set (0.05 sec)

默认的密码长度是8,少于8位依旧会出现报错

mysql>  ALTER USER 'root'@'localhost' IDENTIFIED BY 'beijing';

ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

修改成功

mysql>  ALTER USER 'root'@'localhost' IDENTIFIED BY 'qcloud@2018';

Query OK, 0 rows affected (0.00 sec)

15、使用新密码再次登录,登录成功

[root@seiang software]# mysql -uroot -pqcloud@2018

mysql: [Warning] Using a password on the command line interface can be insecure.

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

Your MySQL connection id is 4

Server version: 5.7.21 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>

16、由于习惯于Linux的提示,所以我们为mysql也设置提示

(1)临时设置

mysql> prompt \u@ \h \d >

root@ localhost (none) >

root@ localhost (none) >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

root@ localhost mysql >prompt \u@\h [\d]>

PROMPT set to '\u@\h [\d]>'

root@localhost [mysql]>

root@localhost [mysql]>

(2)永久设置

[root@seiang ~]# vim /etc/my.cnf

添加下面两句,注意:[]中是mysql,不是mysqld

[mysql]

prompt=\u@\h [\d]>

 

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