Linux database installation - remote connection

Table of contents

MySQL download

MySQL installation

Remote connection MySQL settings

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MySQL download

Download the installation package

mkdir /usr/local/mysql

cd /usr/local/mysql

wget https://downloads.mysql.com/archives/get/p/23/file/mysql-5.7.30-1.el7.x86_64.rpm-bundle.tar

MySQL installation

decompress

tar -xvf mysql-5.7.30-1.el7.x86_64.rpm-bundle.tar

Detect MySQL installation environment

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查看centos7中是否有MariaDB，MariaDB与MySQL关系请自行查阅
rpm -qa | grep mariadb

如果有MariaDB，需要将上述查询到的mairadb全部卸载，否则MySQL安装会出现问题

rpm -e --nodeps 软件名

查看本机是否已经安装过MySQL

rpm -qa | grep -i mysql

卸载MySQL

将步骤3中查询到的mysql安装包全部卸载

rpm -e --nodeps 软件名

查找mysql文件，并将其删除

find / -name mysql
whereis mysql

将find命令和whereis命令查询到的mysql文件全部删除

rm -rf 查询到的mysql路径

删除mysql配置文件

rm /etc/my.cnf

确认是否全部删除mysql

rpm -qa | grep -i mysql

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Install 4 packages in order

Why install in order? because of dependencies

rpm -ivh mysql-community-common-5.7.30-1.el7.x86_64.rpm
rpm -ivh mysql-community-libs-5.7.30-1.el7.x86_64.rpm
rpm -ivh mysql-community-client-5.7.30-1.el7.x86_64.rpm
rpm -ivh mysql-community-server-5.7.30-1.el7.x86_64.rpm  --force --nodeps

database initialization

mysqld --initialize --user=mysql   #yum install -y libaio

grep password /var/log/mysqld.log

Start the mysql service and enter mysql

systemctl start mysqld
mysql -u root -p

change Password

mysql -u root -p ：进入 mysql

Alter user user() identified by 'newpassword' : Change password

Remote connection MySQL settings

Check if mysql is installed

rpm -qa | grep mysql
whereis mysql

Check if mysql is running

service mysqld status
ps -ef|grep mysqld
ps aux|grep mysqld
pidof mysqld

Set remote connection root permissions

#进入到 mysql 中设置 root 用户权限
use mysql;
select user,host from user;
update user set host='%' where user='root';
grant all privileges on *.* to 'root'@'%' identified by '123456';
flush privileges;

Look at port 3306 , see firewall details

netstat -an |grep 3306

Check the status of the firewall

firewall-cmd --state

see firewall rules

firewall-cmd --list-all

or

firewall-cmd --query-port=3306/tcp

If 3306 is not found , set the firewall to open port 3306

run the firewalld firewall command, and reboot :

firewall-cmd --zone=public --add-port=3306/tcp

firewall-cmd --zone=public --add-port=80/tcp –permanent

If you always report an error, start mysql or ssh to log in to linux remotely , and try again

firewall-cmd --reload
Service firewalld restart 重启
systemctl restart firewalld 重启
systemctl disable firewalld 关闭开机启动

CentOS7 database installation script

mkdir /usr/local/mysql
cd /usr/local/mysql
wget https://downloads.mysql.com/archives/get/p/23/file/mysql-5.7.30-1.el7.x86_64.rpm-bundle.tar
tar -xvf mysql-5.7.30-1.el7.x86_64.rpm-bundle.tar

rpm -qa | grep mariadb
rpm -e --nodeps mariadb-libs-5.5.68-1.el7.x86_64

rpm -ivh mysql-community-common-5.7.30-1.el7.x86_64.rpm
rpm -ivh mysql-community-libs-5.7.30-1.el7.x86_64.rpm
rpm -ivh mysql-community-client-5.7.30-1.el7.x86_64.rpm
rpm -ivh mysql-community-server-5.7.30-1.el7.x86_64.rpm  --force --nodeps

yum install -y libaio

mysqld --initialize --user=mysql
grep password /var/log/mysqld.log

systemctl start mysqld
mysql -u root -p

Alter user user() identified by '123456';

use mysql;
select user,host from user;
update user set host='%' where user='root';
grant all privileges on *.* to 'root'@'%' identified by '123456';
flush privileges;