一、系統環境 [root@localhost home]# cat /etc/redhat-release CentOS Linux release 7.2.1511 (Core) 二、mysql安裝 安裝mysql和mysql-devel都成功，但是安裝mysql-server失敗，如下： 出現這 ...
一、系統環境
[root@localhost home]# cat /etc/redhat-release
CentOS Linux release 7.2.1511 (Core)
二、mysql安裝
安裝mysql和mysql-devel都成功，但是安裝mysql-server失敗，如下：
[root@localhost home]# yum install mysql-server
已載入插件：fastestmirror, langpacks
Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast
base | 3.6 kB 00:00:00
extras | 3.4 kB 00:00:00
updates | 3.4 kB 00:00:00
(1/4): base/7/x86_64/group_gz | 155 kB 00:00:01
(2/4): extras/7/x86_64/primary_db | 139 kB 00:00:01
(3/4): base/7/x86_64/primary_db | 5.6 MB 00:00:38
(4/4): updates/7/x86_64/primary_db | 4.7 MB 00:00:39
Loading mirror speeds from cached hostfile
* base: mirrors.163.com
* extras: mirrors.163.com
* updates: mirrors.163.com
沒有可用軟體包 mysql-server。
錯誤：無須任何處理
出現這樣問題是CentOS 7 版本將MySQL資料庫軟體從預設的程式列表中移除，用mariadb代替了
有兩種解決辦法：
1、方法一：安裝mariadb
MariaDB資料庫管理系統是MySQL的一個分支，採用GPL授權許可 MariaDB的目的是完全相容MySQL，包括API和命令行，使之能輕鬆成為MySQL的代替品。MariaDB由MySQL的創始人Michael Widenius（英語：Michael Widenius）主導開發，他早前將自己創建的公司MySQL AB賣給了SUN，此後，隨著SUN被甲骨文收購，MySQL的所有權也落入Oracle的手中。MariaDB名稱來自Michael Widenius的女兒Maria的名字。
安裝mariadb，輸入安裝命令
[root@localhost home]# yum install mariadb-server mariadb
mariadb資料庫的相關命令是：
systemctl start mariadb #啟動MariaDB
systemctl stop mariadb #停止MariaDB
systemctl restart mariadb #重啟MariaDB
systemctl enable mariadb #設置開機啟動
先啟動資料庫
[root@yl-web yl]# systemctl start mariadb
預設無密碼
[root@localhost lzh]# mysql -u root -p
Enter password:
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 6
Server version: 5.5.52-MariaDB MariaDB Server
Copyright (c) 2000, 2016, 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 (0.01 sec)
2、方法二：官網下載安裝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
安裝成功後重啟mysql服務
# service mysqld restart
初次安裝mysql，root賬戶沒有密碼
[root@localhost lzh]# mysql -u root
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 3
Server 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 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> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| test |
+--------------------+
4 rows in set (0.01 sec)
設置密碼
mysql> set password for 'root'@'localhost' =password('password');
Query OK, 0 rows affected (0.00 sec)
安裝完以後mariadb自動就被替換了，將不再生效。
[root@localhost lzh]# rpm -qa |grep mariadb
