linux basic command explanation

1. Basic environment:

Experimental environment

1. This machine is installed on the desktop

2. The network mode is nat ip: 172.20.10.8

Basic environment

1. You can ping the network and network settings

2. Mount the image and configure the yum source repository

Minimum installation needs to download the dependent environment

[[email protected] ~]#yum -y install wget.x86_64

[[email protected] ~]#yum -y install vim

[[email protected] ~]#yum -y install bash-completion

[[email protected] ~]#bash

2. Install Mysql and configure it

1. Check whether the basic environment reserves mysql or mariadb packages:

Check if MySQL is installed

[[email protected]]# cd /etc/yum.repos.d

[[email protected] yum.repos.d]# rpm -qa | grep mysql

[[email protected] yum.repos.d]# rpm -qa | grep mariadb mariadb-libs-5.5.68-1.el7.x86_64

#Forcibly uninstall mariadb-lib

[[email protected] yum.repos.d]# rpm -e --nodeps mariadb-libs

[[email protected] yum.repos.d]# rpm -qa | grep mariadb

#install mysql database

[[email protected] yum.repos.d]# wget https://dev.mysql.com/get/mysql80-community-release-el7-5.noarch.rpm #Get the mysql.rpm package from the Internet

p>

#Install rpm package

[[email protected] yum.repos.d]# rpm -ivh mysql80-community-release-el7-5.noarch.rpm

#Empty cache

[[email protected] ~ yum.repos.d]# yum makecache fast [[email protected] ~yum.repos.d]# yum repolist

2. Install mysql database and login, change password

[[email protected] yum.repos.d]# yum -y install mysql-community-server

[[email protected] yum.repos.d]# grep "passwor" /var/log/mysqld.log 2022-04-15T01:10:12.626454Z 6 [Note] [MY-010454] [Server] A temporarypassword is generated for [email protected]: RbSv)lzrG6ts [[email protected] yum.repos.d]# mysql -u root -p Enter password: mysql> set password='[email protected]'; Query OK, 0 rows affected (0.00sec) mysql> exit Bye

3. Set to allow remote access

[[email protected] ~]systemctl stop firewalld.service

[[email protected] ~]systemctl disable firewalld.service

4. Modify mysql permissions to allow anyone to connect

[[email protected] yum.repos.d]# mysql -u root -p Enter password: mysql> use mysql; Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with-A Database changed mysql> select Host,User from user; +-----------+------------------+ | Host | User |+-----------+------------------+ | localhost | mysql.infoschema | | localhost | mysql.session | | localhost | mysql.sys | | localhost | root | +-----------+------------------+ 4 rows in set (0.00 sec) mysql>update user set Host='%' where User=root; Query OK, 1 row affected (0.00 sec) Rows matched: 1 Changed: 1 Warnings: 0 mysql> flush privileges; Query OK, 0 rows affected (0.01 sec)mysql> exit Bye

5. Use the connection tool: use the Navicat connection tool to test

New---mysql Note: The password is the database password and the host is the IP address of the virtual machine (the password must be entered manually)