1. Download the mysql installation package from the official website
The following picture is an introduction to the mysql installation package
2 , Install software package
1, Install dependencies
# yum -y install perl-Date-Dumper perl-JSON perl-Time-HiRes
2, Unzip the mysql installation package
# tar -xvf mysql-5.7.24.tar //解压mysql包
3, Uninstall the old version of the package
[root@localhost ~]# rm -rf /etc/my.cnf
4, Delete data
[root@localhost ~]# rm -rf /var/lib/mysql/*
5. Uninstall the software package (no software package will be displayed as uninstalled)
[root@localhost ~]# rpm -e --nodeps mariadb-server mariadb
Warning: /var/log/mariadb/mariadb.log has been saved as /var /log/mariadb/mariadb.log.rpmsave
#yum -y remove mariadb-libs.x86_64 1:5.5.52-1.el7
6. Install yum source
#yum -y install mysql-community-client mysql-community-common mysql-community-devel mysql-community-embedded mysql-community-embedded-compat mysql-community-embedded-devel mysql-community-libs mysql-community-libs-compat mysql-community-minimal-debuginfo mysql-community-server mysql-community-test
or
#yum -y install mysql-community-*.rpm
7. Check the installed mysql related installation package
# rpm -qa | grep -y mysql
8. Start the service
# systemctl start mysqld # systemctl enable mysqld //设置开机自启 # systemctl status mysqld [root@proxy mysql]# ss -antulp | grep mysqld //查看服务启动端口 # ps aux | grep mysqld //查进程
3. Connect to the database
1. Check the randomly generated root password
# grep password /var/log/mysqld.log # grep 'temporary password' /var/log/mysqld.log //随机生成的管理密码
Initial password login mysql:
(!!!You must change the password management immediately when logging in with a randomly generated password, otherwise an error will be reported)
2. Client command mysql to connect to the database
# mysql -hlocalhost -uroot -p'pIhMu,i2OS#,' //用初始密码登录 mysql> \h //登录成功后,查可用的快捷键
4. Change the password
1. You can only modify the password first
mysql> alter user root@"localhost" identified by "123qqq...A";
2. You can modify the password limit length
mysql> show variables like "%password%"; //查询密码有关的变量 mysql> set global validate_password_policy=0; //只验证长度 mysql> set global validate_password_length=6; //修改密码长度为6位 mysql> alter user root@"localhost" identified by "123456"; //修改root密码为123456
Recommended tutorial: mysql tutorial
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