Mysql environment installation under Linux (centos)

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linux The environment installation is relatively simple,But still encounter all kinds of strange problems,Let's sort it out

安装 mysql We will use the following address：

Mysql 官方文档的地址,可以参考,Don't use them all

dev.mysql.com/doc/refman/…

开始安装 mysql

卸载默认的 mysql

avoid existing mysql Affects what we're going to install now mysql

yum search mysql 
yum remove mariadb.x86_64
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到 mysql 官网上下载 rpm

地址：dev.mysql.com/downloads/r…

Of course, you can also execute the following commands directly,使用 wget 的方式将 rpm下载到我们 linux 环境中,如果要下载其他版本,可以修改 rpm 的具体名称 , For example, we are using this time mysql57-community-release-el7-11.noarch.rpm

wget https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm
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本地安装 mysql yum 源

yum localinstall mysql
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Check the corresponding ones that need to be installed mysql 版本,进行安装

yum search mysql 
yum install mysql-community-server.x86_64
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检查安装是否成功

ps -ef | grep mysql
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启动 mysql,重启 mysql, 停止 mysql

service mysqld start 
service mysqld restart 
service mysqld stop
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查找默认密码

cat /var/log/mysqld.log | grep password
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mysql -uroot -p 回车,然后输入密码
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登录之后,We can see these databases normally

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
6 rows in set (0.00 sec)
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修改密码

SET PASSWORD = PASSWORD('xxxx');
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Permission to activate remote connection

选择 mysql 数据库,and query the current one user 表

use mysql; 
show tables;
select host, user from user;
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更新 host 字段


update user set host="%" where Host='localhost' and user = "root"; 
flush privileges;
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更新完毕后,Let's check again user 表,You can see the effect of our update

select host, user from user;
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After installation, you can play happily

当然,If you are installing on a cloud server mysql ,If you want to access the cloud server on your own local machine mysql,Then remember to use the management interface of your corresponding server operator,将3306 端口打开,当然,It can also be mapped to other ports,As long as it meets our needs

Problems that may be encountered in actual operation

按照上面 10 个步骤来操作,无脑安装,Not bad if it goes well,If there is a problem,也别慌张,继续看

Some minor problems encountered are not recorded here,比较好解决,Record one here mysql 版本的问题

咱们在安装 mysql 的步骤中,可能会出现这样的问题

软件包：mysql-community-server-5.7.20-1.el6.x86_64 (mysql57-community)需要：libsasl2.so.2()(64bit)您可以尝试添加 --skip-broken 选项来解决该问题
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We can solve it this way

进入 vim mysql-community.repo

vim /etc/yum.repos.d/mysql-community.repo
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把 baseurl 中的 6 改成 7

baseurl=http://repo.mysql.com/yum/mysql-5.7-community/el/6/$basearch/

修改成 

baseurl=http://repo.mysql.com/yum/mysql-5.7-community/el/7/$basearch/
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