服務器維護CentOS7.2下安裝MySQL

2020-06-25 11:16 作者：admin

服務器維護小知識一、系統環境

 [root@localhost home]# cat /etc/RedHat-release
 CentOS Linux release 7.2.1511 (Core)

服務器維護小知識二、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
    已加載插件：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
 沒有可用軟件包 mysql-server。
 錯誤：無須任何處理
出現這樣問題是CentOS 7 版本將MySQL數據庫軟件從默認的程序列表中移除，用mariadb代替了
服務器維護小知識有兩種解決辦法：
 1、方法一：安裝mariadb
MariaDB數據庫管理系統是MySQL的一個分支，采用GPL授權許可 MariaDB的目的是完全兼容MySQL，包括API和命令行，使之能輕松成為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，此后，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數據庫的相關命令是：
   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
服務器維護小知識先啟動數據庫
  [root@yl-web yl]# systemctl start mariadb
  默認無密碼
[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)

服務器維護小知識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
安裝成功后重啟mysql服務
    # service mysqld restart
服務器維護小知識初次安裝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)
安裝完以后mariadb自動就被替換了，將不再生效。
[root@localhost lzh]# rpm -qa |grep mariadb
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