阿里云CentOS系统环境配置阿里云CentOS系统环境配置 MySQL centos安装mysql 执行如下命令，

阿里云CentOS系统环境配置

MySQL

centos安装mysql

执行如下命令，更新YUM源。

rpm -Uvh [http://dev.mysql.com/get/mysql57-community-release-el7-9.noarch.rpm](http://dev.mysql.com/get/mysql57-community-release-el7-9.noarch.rpm?spm=a2c6h.12873639.article-detail.7.5aef255eJYTKv4&file=mysql57-community-release-el7-9.noarch.rpm)

执行如下命令，安装MySQL。

yum -y install mysql-community-server --nogpgcheck

执行如下命令，查看MySQL版本号。

mysql -V

执行如下命令，启动MySQL服务。

systemctl start mysqld

执行如下命令，设置MySQL服务开机自启动。

systemctl enable mysqld

配置MySQL的root用户密码。执行如下命令，查看/var/log/mysqld.log文件，获取root用户的初始密码。

grep 'temporary password' /var/log/mysqld.log``mysql -uroot -p输入log中密码

执行以下命令，修改MySQL的root用户的初始密码。

ALTER USER 'root'@'localhost' IDENTIFIED BY '12345678';
在MySQL中，密码策略分为四个级别：LOW、MEDIUM、STRONG、默认（默认是MEDIUM）。要将密码策略设置为LOW（只校验密码长度），可以使用以下命令：
```
SET GLOBAL validate_password.policy = 0;
```
设置密码长度要求：

设置密码长度要求，确保密码至少为8位字符。您可以使用以下命令：
```
SET GLOBAL validate_password.length = 8;
```
刷新权限：

刷新MySQL的权限以应用新的密码策略设置：
```
FLUSH PRIVILEGES;
```

权限

编辑

Redis

yum安装redis

1.在centos系统上需要安装epel源

wget -O /etc/yum.repos.d/epel.repo mirrors.aliyun.com/repo/epel-7… centos7版本的

2.查看yum仓库redis版本

yum info redis

[root@master ~]# yum info redis
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Installed Packages
Name        : redis
Arch        : x86_64
Version     : 3.2.12
Release     : 2.el7
Size        : 1.4 M
Repo        : installed
From repo   : epel
Summary     : A persistent key-value database
URL         : http://redis.io
License     : BSD
Description : Redis is an advanced key-value store. It is often referred to as a data
            : structure server since keys can contain strings, hashes, lists, sets and
            : sorted sets.
            : 
            : You can run atomic operations on these types, like appending to a string;
            : incrementing the value in a hash; pushing to a list; computing set
            : intersection, union and difference; or getting the member with highest
            : ranking in a sorted set.
            : 
            : In order to achieve its outstanding performance, Redis works with an
            : in-memory dataset. Depending on your use case, you can persist it either
            : by dumping the dataset to disk every once in a while, or by appending
            : each command to a log.
            : 
            : Redis also supports trivial-to-setup master-slave replication, with very
            : fast non-blocking first synchronization, auto-reconnection on net split
            : and so forth.
            : 
            : Other features include Transactions, Pub/Sub, Lua scripting, Keys with a
            : limited time-to-live, and configuration settings to make Redis behave like
            : a cache.
            : 
            : You can use Redis from most programming languages also.

3.yum安装并开启开机自启

yum install redis systemctl enable --now redis

[root@master ~]# yum install redis
[root@master ~]# systemctl enable --now redis        #开启开机自启

4.查看redis是否成功启动

ss -ntl