阿里云Centos7.4 安装JDK1.8和Mysql5.7

深碍√TFBOYSˉ_ 2022-05-23 08:07 182阅读 0赞

# 一， 安装JDK #

yumlist java-1.8\*

yum install java-1.8.0-openjdk.x86\_64 -y

# 二， 安装mysql5.7 #

## 1.配置YUM源 ##

\# 下载mysql源安装包

wget [http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm][http_dev.mysql.com_get_mysql57-community-release-el7-8.noarch.rpm]

\# 安装mysql源

yum localinstallmysql57-community-release-el7-8.noarch.rpm

检查mysql源是否安装成功

yum repolist enabled | grep "mysql.\*-community.\*"

可以修改`vim /etc/yum.repos.d/mysql-community.repo`源，改变默认安装的mysql版本。比如要安装5.6版本，将5.7源的enabled=1改成enabled=0。然后再将5.6源的enabled=0改成enabled=1即可

## 2.安装MySQL ##

yum install mysql\-community-server

## 3.启动MySQL服务 ##

systemctl start mysqld

查看MySQL的启动状态

systemctl status mysqld

鈼\[0m mysqld.service -MySQL Server

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

Active: active (running) sinceMon 2018-06-04 22:52:41 CST; 49s ago

Docs: man:mysqld(8)

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

Process: 26161ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid$MYSQLD\_OPTS (code=exited, status=0/SUCCESS)

Process: 26087ExecStartPre=/usr/bin/mysqld\_pre\_systemd (code=exited, status=0/SUCCESS)

Main PID: 26165 (mysqld)

CGroup:/system.slice/mysqld.service

鈹斺攢26165 /usr/sbin/mysqld--daemonize --pid-file=/var/run/mysqld/mysqld.pid

Jun 04 22:52:34 dancehub systemd\[1\]: Starting MySQL Server...

Jun 04 22:52:41 dancehub systemd\[1\]: Started MySQL Server.

## 4、开机启动 ##

systemctl enable mysqld

systemctl daemon-reload

## 5、修改root本地登录密码 ##

mysql安装完成之后，在/var/log/mysqld.log文件中给root生成了一个默认密码。通过下面的方式找到root默认密码，然后登录mysql进行修改：

grep 'temporarypassword' /var/log/mysqld.log

2018-06-04T14:52:37.382776Z 1 \[Note\] A temporary password is generated forroot@localhost: W>xg.Wsv;2.Q

W>xg.Wsv;2.Q 即为密码

mysql \-uroot-p

ALTER USER 'root'@'localhost' IDENTIFIED BY'Mokingone123456!';

注意：mysql5.7默认安装了密码安全检查插件（validate\_password），默认密码检查策略要求密码必须包含：大小写字母、数字和特殊符号，并且长度不能少于8位。否则会提示ERROR1819 (HY000): Your password does not satisfy the current policy requirements错误.

通过msyql环境变量可以查看密码策略的相关信息：

mysql> show variables like'%password%';

\+---------------------------------------+--------+

| Variable\_name                        | Value  |

\+---------------------------------------+--------+

| default\_password\_lifetime            | 0      |

| disconnect\_on\_expired\_password       | ON     |

| log\_builtin\_as\_identified\_by\_password | OFF    |

| mysql\_native\_password\_proxy\_users    | OFF    |

| old\_passwords                        | 0      |

| report\_password                      |        |

| sha256\_password\_proxy\_users          | OFF    |

| validate\_password\_check\_user\_name    | OFF    |

| validate\_password\_dictionary\_file    |        |

| validate\_password\_length             | 8      |

| validate\_password\_mixed\_case\_count   | 1      |

| validate\_password\_number\_count       | 1      |

| validate\_password\_policy             | MEDIUM |

| validate\_password\_special\_char\_count | 1      |

validate\_password\_policy：密码策略，默认为MEDIUM策略   
validate\_password\_dictionary\_file：密码策略文件，策略为STRONG才需要   
validate\_password\_length：密码最少长度   
validate\_password\_mixed\_case\_count：大小写字符长度，至少1个   
validate\_password\_number\_count ：数字至少1个   
validate\_password\_special\_char\_count：特殊字符至少1个   
*上述参数是默认策略MEDIUM的密码检查规则。*

共有以下几种密码策略：

<table style="background:#FFFFFF;"> 
 <thead> 
  <tr> 
   <td style="background:rgb(239,243,245);"><p><strong>策略</strong></p></td> 
   <td style="background:rgb(239,243,245);"><p><strong>检查规则</strong></p></td> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td><p>0 or LOW</p></td> 
   <td><p>Length</p></td> 
  </tr> 
  <tr> 
   <td><p>1 or MEDIUM</p></td> 
   <td><p>Length; numeric, lowercase/uppercase, and special characters</p></td> 
  </tr> 
  <tr> 
   <td><p>2 or STRONG</p></td> 
   <td><p>Length; numeric, lowercase/uppercase, and special characters; dictionary file</p></td> 
  </tr> 
 </tbody> 
</table>

MySQL官网密码策略详细说明：[http://dev.mysql.com/doc/refman/5.7/en/validate-password-options-variables.html\#sysvar\_validate\_password\_policy][http_dev.mysql.com_doc_refman_5.7_en_validate-password-options-variables.html_sysvar_validate_password_policy]

在/etc/my.cnf文件添加validate\_password\_policy配置，指定密码策略

\# 选择0（LOW），1（MEDIUM），2（STRONG）其中一种，选择2需要提供密码字典文件

validate\_password\_policy=0

如果不需要密码策略，添加my.cnf文件中添加如下配置禁用即可：

validate\_password = off

重新启动mysql服务使配置生效：

systemctl restartmysqld

## 6、添加远程登录用户 ##

默认只允许root帐户在本地登录，如果要在其它机器上连接mysql，必须修改root允许远程连接，或者添加一个允许远程连接的帐户

mysql> GRANT ALL PRIVILEGES ON\*.\*TO'mokingone'@'%' IDENTIFIED BY' Mokingone123456!'WITH GRANT OPTION;

### 7、配置默认编码为utf8 ###

修改/etc/my.cnf配置文件，在\[mysqld\]下添加编码配置，如下所示：

\[mysqld\]

character\_set\_server=utf8

init\_connect='SETNAMES utf8'

重新启动mysql服务，查看数据库默认编码如下所示：

systemctl restart mysqld

**默认配置文件路径：**   
配置文件：/etc/my.cnf   
日志文件：/var/log//var/log/mysqld.log   
服务启动脚本：/usr/lib/systemd/system/mysqld.service   
socket文件：/var/run/mysqld/mysqld.pid

[http_dev.mysql.com_get_mysql57-community-release-el7-8.noarch.rpm]: http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm
[http_dev.mysql.com_doc_refman_5.7_en_validate-password-options-variables.html_sysvar_validate_password_policy]: http://dev.mysql.com/doc/refman/5.7/en/validate-password-options-variables.html#sysvar_validate_password_policy