Operating instructions for installing mysql5.7 in centos7

CentOS7 install MySQL5.7 Operation instructions

0、 Preposition

0.1、 server information

The server IP Address	operating system	explain
192.168.112.131	CentOS7 64 position	server information

0.2、MySQL edition

MySQL  Installed version : mysql-5.7.38

1、 Find out if you want to install MySQL

rpm -qa|grep mysql

If an older version of... Is installed MySQL, Please refer to the following methods for unloading

1.1、rpm Install as uninstall

rpm -e --nodeps mysql-XXXXXXXXX

1.2、 Uninstall the binary package installation mode

#  Stop mysql systemctl stop mysqld.service #  Check the status  systemctl status mysqld.service #  lookup mysql find / -name mysql #  Delete the found related files  rm -rf XXXXXX #  View and delete mysql user  id mysql userdel mysql #  Delete profile  rm -f /etc/my.cnf

2、 Find if it exists mariadb package

rpm -qa|grep mariadb

3、 uninstall mariadb package

rpm -e --nodeps mariadb-libs-XXXXXX.el7.x86_64

4、 install MySQL

cd /usr/local mkdir mysql cd mysql wget https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.38-1.el7.x86_64.rpm-bundle.tar tar -xvf mysql-5.7.38-1.el7.x86_64.rpm-bundle.tar

5、 install common,libs,client,server

rpm -ivh mysql-community-common-5.7.38-1.el7.x86_64.rpm --nodeps --force rpm -ivh mysql-community-libs-5.7.38-1.el7.x86_64.rpm --nodeps --force rpm -ivh mysql-community-client-5.7.38-1.el7.x86_64.rpm --nodeps --force rpm -ivh mysql-community-server-5.7.38-1.el7.x86_64.rpm --nodeps --force ​ #  Check the installation  rpm -qa | grep mysql

6、 Initialization and startup MySQL

#  initialization MySQL mysqld --initialize #  to grant authorization  chown mysql:mysql /var/lib/mysql -R #  start-up MySQL,  In the command  mysqld.service  It can be abbreviated as  mysqld,  The following commands are the same  systemctl start mysqld.service #  Set up MySQL Boot from boot  systemctl enable mysqld.service

explain ：MySQL Service related commands are as follows

# 1、 start-up MySQL systemctl start mysqld.service # 2、 stop it MySQL systemctl stop mysqld.service # 3、 restart MySQL systemctl restart mysqld.service # 4、 see MySQL state  systemctl status mysqld.service # 5、 Set up MySQL Self starting  systemctl enable mysqld.sercice # 6、 see MySQL Is it self starting  systemctl list-unit-files|grep mysqld.service

7、 Login and Authorization MySQL

cat /var/log/mysqld.log | grep password mysql -uroot -p

8、 Change Password

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '123456';

explain ： When there is an error that the password cannot be modified , Refer to the following operation

1> error message

ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

2> Solution

--  Set password policy verification level  set global validate_password_policy=LOW; --  Set the password verification length  set global validate_password_length=6; --  Refresh cache  flush privileges;

9、 Authorize remote access

--  to root User authorization  create user 'root'@'%' identified with mysql_native_password by '123456'; grant all privileges on *.* to 'root'@'%' with grant option; flush privileges; exit

10、 Firewall configuration

explain ： About firewall configuration , Here are two ways to configure , Select according to the system firewall requirements

10.1、 Use CentOS 7 The default firewall firewalld

systemctl start firewalld firewall-cmd --zone=public --add-port=3306/tcp --permanent firewall-cmd --reload

explain ： About firewalld Firewall related commands are as follows

# 1、 Start firewall service , firewalld.service  It can be abbreviated as  firewalld systemctl start firewalld.service # 2、 Check the running status of firewall service  systemctl status firewalld.service # 3、 Restart firewall service  systemctl restart firewalld.service # 4、 Turn off firewall  systemctl stop firewalld.service # 5、 Boot up the firewall  systemctl enable firewalld.service # 6、 prohibit firewalld Boot up  systemctl disable firewalld.service ## firewall-cmd relevant  # 1、 Add port ,  for example :  add to  3306  port ,  explain : --permanent  The parameter indicates permanent effect , If there is no such parameter, execute  reload  Post failure  firewall-cmd --zone=public --add-port=80/tcp --permanent # 2、 Close the port ,  for example ： close 3306 port  firewall-cmd --zone=public --remove-port=3306/tcp --permanent # 3、 Update firewall rules  firewall-cmd --reload # 4、 Look at the open ports ,  for example :  Check out the open  3306  port  firewall-cmd --zone= public --query-port=3306/tcp # 5、 Delete open port ,  for example :  Delete  3306  port  firewall-cmd --zone= public --remove-port=3306/tcp --permanent # 6、 Check all open ports of the firewall  firewall-cmd --zone=public --list-ports # 7、 View firewall status ( Show... When off notrunning, It will show running) firewall-cmd --state # 8、 View firewall version information  firewall-cmd --version

10.2.2、 install iptables A firewall

In the root folder , Execute the following command , install iptables A firewall

yum -y install iptables-services

10.2.3、 Set up and start iptables A firewall

In the root folder , Execute the following command

systemctl enable iptables; systemctl start iptables;

10.2.4、 iptables Configure port access

In the root folder , Execute the following command

vi /etc/sysconfig/iptables

Add the following

-A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT

10.2.5、 restart iptables A firewall

In the root folder , Execute the following command

systemctl restart iptables.service

10.2.6、 Set up iptables The firewall starts up automatically

systemctl enable iptables.service

11、 To configure MySQL

1> Execute the following statement

vi /etc/my.cnf

Add the following configuration information

[client] port = 3306 default-character-set = utf8 [mysqld] character-set-server = utf8 collation-server = utf8_general_ci #  close mysql Case sensitivity （ I.e. requirement mysql Insensitive to the case of a field ） lower_case_table_names = 1

2> After saving the configuration , restart MySQL service

systemctl restart mysqld.service

12、 Use the database connection tool to test

1> View this machine IP Information

ifconfig

2> Use the database connection tool to connect the test

Take the local server information as an example ：

 Host name ：192.168.112.131  user name ：root  password ：123456  port ：3306