Mysql installation configuration at centOS7

1, in the default CentOS installed MariaDB, MySQL is the branch, first delete

rpm -qa | grep mariadb 

会得到已经安装的mariadb列表
例如有一个：mariadb-libs-5.5.60-1.el7_5.x86_64

rpm -e --nodeps mariadb-libs-5.5.60-1.el7_5.x86_64

删除mariadb

2, the installation source yum

wget https://dev.mysql.com/get/mysql80-community-release-el7-1.noarch.rpm
sudo yum install mysql80-community-release-el7-1.noarch.rpm

3, to see if the installation was successful

sudo yum repolist all|grep mysql

3, configure mysql version to install

sudo vim /etc/yum.repos.d/mysql-community.repo

enabled 为1表示启用，将要安装的版本的enabled改为1后保存

4, install mysql
this step a little longer. . . .

sudo yum install mysql-community-server.x86_64

5, start and view status

sudo service mysqld start      //启动mysql
sudo service mysqld status   //查看mysql状态
sudo systemctl enable mysqld //配置开机启动

That this has proved successful start

6, change passwords

• Give root to generate a default password
• grep 'temporary password' /var/log/mysqld.log
• Enter mysql, and use generated passwords
• mysql -uroot -p
• change Password
• ALTER USER 'root'@'localhost' IDENTIFIED BY '这里输入新密码';

mysql password requirements are very strict, by modifying the configuration can use a simple password

• First check your parameter name
• SHOW VARIABLES LIKE 'validate_password%';
• `Modify validate_password.policy
• set global validate_password.policy=0;
• Modify password length
• set global validate_password.length=你要的长度
• Modify the new password, simple passwords such as 1234
• ALTER USER 'root'@'localhost' IDENTIFIED BY '这里输入新密码';

7, view and modify encoded as utf8

• Check coding case
• show variables like '%char%';
• Change profile
• vim /etc/my.cnf
• In the [client] Add next
  Note: If you do not [client] then add their own, but can not add [mysqld] Here
  I add to the [mysqld] above it

default-character-set=utf8

• In [mysqld] Add the following

character_set_server=utf8
collation-server=utf8_general_ci