1. System environment
The system version after yum update upgrade is:
[root@yl-web yl]# cat /etc/redhat-release CentOS Linux release 7.1.1503 (Core)
Second, mysql installation
The information given on the Internet is generally
#yum install mysql #yum install mysql-server #yum install mysql-devel
The installation of mysql and mysql-devel was successful, but the installation of mysql-server failed, as follows:
[root@yl-web yl]# yum install mysql-server Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: mirrors.sina.cn * extras: mirrors.sina.cn * updates: mirrors.sina.cn No package mysql-server available. Error: Nothing to do
Check the information and find that the CentOS 7 version removed the MySQL database software from the default program list and replaced it with mariadb.
There are two solutions:
1. Method 1: Install mariadb
The MariaDB database management system is a fork of MySQL, mainly maintained by the open source community and licensed under the GPL. One of the reasons for developing this branch is: after Oracle acquired MySQL, there is a potential risk of closing MySQL, so the community adopts the method of branching to avoid this risk. MariaDB is designed to be fully compatible with MySQL, including API and command line, making it an easy replacement for MySQL.
Install mariadb, size 59 M.
[root@yl-web yl]# yum install mariadb-server mariadb
The relevant commands for the mariadb database are:
systemctl start mariadb #启动MariaDB
systemctl stop mariadb #停止MariaDB
systemctl restart mariadb #重启MariaDB
systemctl enable mariadb #Set boot up
So start the database first
[root@yl-web yl]# systemctl start mariadb
Then you can use mysql normally
[root@yl-web yl]# mysql -u root -p Enter password: Welcome to the MariaDB monitor. Commands end with ; or \g. Your MariaDB connection id is 3 Server version: 5.5.41-MariaDB MariaDB Server Copyright (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)]>
After installing mariadb, it also displays MariaDB [(none)]> , which may seem a little strange. Below is the second method.
2. Method 2: Download and install mysql-server from the official website
# 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
After the installation is successful, restart the mysql service.
# service mysqld restart
When installing mysql for the first time, the root account has no password.
[root@yl-web yl]# 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) mysql>
set password
mysql> set password for 'root'@'localhost' =password('password'); Query OK, 0 rows affected (0.00 sec) mysql>
No need to restart the database to take effect.
In the mysql installation process the following:
Installed: mysql-community-client.x86_64 0:5.6.26-2.el7 mysql-community-devel.x86_64 0:5.6.26-2.el7 mysql-community-libs.x86_64 0:5.6.26-2.el7 mysql-community-server.x86_64 0:5.6.26-2.el7 Dependency Installed: mysql-community-common.x86_64 0:5.6.26-2.el7 Replaced: mariadb.x86_64 1:5.5.41-2.el7_0 mariadb-devel.x86_64 1:5.5.41-2.el7_0 mariadb-libs.x86_64 1:5.5.41-2.el7_0 mariadb-server.x86_64 1:5.5.41-2.el7_0
So after installation, mariadb is automatically replaced and will no longer take effect.
[root@yl-web yl]# rpm -qa |grep mariadb [root@yl-web yl]#
Three, configure mysql
1. Coding
The mysql configuration file is /etc/my.cnf
Finally add the encoding configuration
[mysql]
default-character-set =utf8
The character encoding here must be the same as in /usr/share/mysql/charsets/Index.xml.
2. Remote connection settings
Assign all permissions on all tables in all databases to root at all IP addresses.
mysql> grant all privileges on *.* to root@'%'identified by 'password';
If it is a new user instead of root, you must create a new user first
mysql>create user 'username'@'%' identified by 'password';
You can now connect remotely.