一、系统环境
yum update升级以后的系统版本为
| [root@yl-web yl]# cat /etc/redhat-release CentOS Linux release 7.1.1503 (Core) |
二、mysql安装
一般网上给出的资料都是
| #yum install mysql#yum install mysql-server#yum install mysql-devel |
安装mysql和mysql-devel都成功，但是安装mysql-server失败，如下：
| [root@yl-web yl]# yum install mysql-serverLoaded plugins: fastestmirrorLoading mirror speeds from cached hostfile * base: mirrors.sina.cn * extras: mirrors.sina.cn * updates: mirrors.sina.cnNo package mysql-server available.Error: Nothing to do |
查资料发现是CentOS 7 版本将MySQL数据库软件从默认的程序列表中移除，用mariadb代替了。
有两种解决办法：
1、方法一：安装mariadb
MariaDB数据库管理系统是MySQL的一个分支，主要由开源社区在维护，采用GPL授权许可。开发这个分支的原因之一是：甲骨文公司收购了MySQL后，有将MySQL闭源的潜在风险，因此社区采用分支的方式来避开这个风险。MariaDB的目的是完全兼容MySQL，包括API和命令行，使之能轻松成为MySQL的代替品。
安装mariadb，大小59 M。
| [root@yl-web yl]# yum install mariadb-server mariadb |
mariadb数据库的相关命令是：
| systemctl start mariadb #启动MariaDBsystemctl stop mariadb #停止MariaDBsystemctl restart mariadb #重启MariaDBsystemctl enable mariadb #设置开机启动 |
所以先启动数据库
| [root@yl-web yl]# systemctl start mariadb |
然后就可以正常使用mysql了
| [root@yl-web yl]# mysql -u root -pEnter password: Welcome to the MariaDB monitor. Commands end with ; or /g.Your MariaDB connection id is 3Server version: 5.5.41-MariaDB MariaDB ServerCopyright (c) 2000, 2014, Oracle, MariaDB Corporation Ab and others.Type 'help;' or '/h' for help. Type '/c' to clear the current input statement.MariaDB [(none)]> show databases;+--------------------+| Database |+--------------------+| information_schema || mysql || performance_schema || test |+--------------------+4 rows in set (0.00 sec)MariaDB [(none)]> |
安装mariadb后显示的也是 MariaDB [(none)]> ，可能看起来有点不习惯。下面是第二种方法。
2、方法二：官网下载安装mysql-server
| # wget http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpm# rpm -ivh mysql-community-release-el7-5.noarch.rpm# yum install mysql-community-server |
安装成功后重启mysql服务。
| # service mysqld restart |
初次安装mysql，root账户没有密码。
| [root@yl-web yl]# mysql -u root Welcome to the MySQL monitor. Commands end with ; or /g.Your MySQL connection id is 3Server version: 5.6.26 MySQL Community Server (GPL)Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '/h' for help. Type '/c' to clear the current input statement.mysql> show databases;+--------------------+| Database |+--------------------+| information_schema || mysql || performance_schema || test |+--------------------+4 rows in set (0.01 sec)mysql> |
