MySQL advanced Chapter 1 (installing MySQL under Linux) [i]

To be honest, there is no need to write another blog like this , But to record the passing of the morning , Summarize your own learning achievements .
Or simply write . I hope to witness the growth of byte and plant trees for later generations ！

One MySQL Of Linux Version installation

1.1 Download the installation package

MySQL Official website

• There is no direct choice here centosos 7 The version of the system , The reason for choosing the corresponding Red Hat Enterprise Linux

Don't ask why , Because we don't know , ha-ha

- In order not to waste traffic , After all, the place where Xiaobian recently sat was not free WiFi, Only use flow
Just use the pictures in the learning courseware , The version is a little old , I hope readers will forgive me ！！！

So far we MySQL Installation package download completed 🥳

1.2 . Summary Linux Installation under system MySQL In several ways

Installation mode	characteristic
rpm	Simple installation , Poor flexibility , Unable to flexibly select the version 、 upgrade
rpm repository	The installation package is very small , Version installation is simple and flexible , Easy upgrade , Need to connected to the Internet
General binary package	Installation is more complicated , High flexibility , The platform has good universality
Source package	Complicated installation , Long time , The parameter setting is flexible , Good performance

1.3 CentOs Lower inspection MySQL rely on 【 No problem with normal conditions 】

Please note that ： Is in CentOs Terminal check for

1.3.1 Check /tmp Temporary directory permissions （ Absolutely necessary ！！！）

• because mysql During installation , Will pass mysql The user is in /tmp New under the directory tmp_db file , So please give /tmp Greater authority . Of board
  That's ok ：

chmod -R 777 /tmp

1.3.2 Before the installation , Checking depends on

rpm -qa|grep libaio

• If there is libaio The package is as follows :
  

rpm -qa|grep net-tools

• If there is libaio Bao Ju :
  

1.3.3.0 CentOS7 Next MySQL Preparation for offline installation during installation

Secure terminal emulation Software | Remote management server tools

What's that? ？
Xshell It is a powerful security terminal simulation software , It supports SSH1, SSH2, as well as Microsoft Windows Platform TELNET agreement .Xshell Through the Internet to remote host security connection and its innovative design and features to help users enjoy their work in a complex network environment .
What's the role ？
Xshell yes Windows The next very powerful security terminal simulation software , Support Telnet、Rlogin、SSH、SFTP、Serial Such agreement , It's very convenient to linux Host for remote management .

• We need to use the Xshell and Xftp, The official website provides a free version, but it can only be used for a few months , But it's also good , It's very fragrant , Some friends can go to a certain place to find a cracked version , But be careful not to let your computer become An advertising device Of Rogue software farm , Don't trust some High speed farrowing device
  And then we put our centos And Windows Connect

1.3.3.0.1 see centos Of ip Address

It is recommended to set centos Of ip It's static , Dynamic is too troublesome
This demonstration , Use dynamic address

• see CentOs Of IP Address
  Input under terminal ：

ip addr

open Xftp–> newly build –> routine










Empathy ： We can be together Xshell Connect to CentOsc View operation

cd /opt

ll

1.3.3 CentOS7 Next MySQL setup script

• stay mysql The installation file directory of ：（ Must be executed sentence by sentence ） Don't make it easy to paste at one time
• Paste the shortcut key in Xshell neutralize , It is recommended to right-click to paste

rpm -ivh mysql-community-common-8.0.25-1.el7.x86_64.rpm

rpm -ivh mysql-community-client-plugins-8.0.25-1.el7.x86_64.rpm

rpm -ivh mysql-community-libs-8.0.25-1.el7.x86_64.rpm

rpm -ivh mysql-community-client-8.0.25-1.el7.x86_64.rpm

rpm -ivh mysql-community-server-8.0.25-1.el7.x86_64.rpm

• Be careful : For example, when checking the work , No inspection mysql Environment dependent installation mysql-community-server Will report a mistake

Kangge ： The class is beginning
rpm yes Redhat Package Manage abbreviation , adopt RPM Management of , Users can wrap the source code as rpm For extension
File form , Easy to install .
-i , --install Install package
-v , --verbose Provide more detailed information output
-h , --hash The hash mark is listed when the package is installed ( and -v The effect is better when used together ), Show the progress bar

resolvent ：

error ：

	mariadb-libs  By  mysql-community-libs-8.0.25-1.el7.x86_64  replace 

Method 1 ：

yum remove mysql-libs
#  solve , Clear the previously installed dependencies 

But the author is installing MySQL5.7 At version time , Executed statements , Still reporting a mistake
At last I found

Supplementary version of method 1

Wrong show ：

rpm -ivh mysql-community-common-5.7.28-1.el7.x86_64.rpm
rpm -ivh mysql-community-client-5.7.30-1.el7.x86_64.rpm --nodeps --force
rpm -ivh mysql-community-client-5.7.28-1.el7.x86_64.rpm --nodeps --force
rpm -ivh mysql-community-server-5.7.28-1.el7.x86_64.rpm --nodeps --force

Kangge review tips ： Where there is a pit, there is brother Kang
Dependency checking ：MySQL5.7 The version still needs to be checked before installation 1.3.1 Check /tmp Temporary directory permissions and 1.3.2 Before the installation , Checking depends on
Number of packages installed ： It's just MySQL5.7 The file of only 4 individual
Installation sequence ： If you use Mr. songhongkang of shangsilicon Valley MySQL Course , After reaching the installation package resources , It is suggested to paste my sentence directly —— Save trouble , Take a rest

1.3.4 see MySQL edition

mysql --version
# or 
mysqladmin --version

Execute the following command , Check whether the installation is successful . Need to increase the -i Don't be case sensitive , Otherwise we can't find .

rpm -qa|grep -i mysql

1.3.5 Initialization of services

In order to ensure that the owner of database directories and files is mysql The logged in user , If you are root Identity running mysql service , Need to hold on to
Line the following command to initialize ：

mysqld --initialize --user=mysql

explain ： --initialize Options default to “ Security ” Mode to initialize , Will be root The user generates a password and will The password is marked as too
period , After logging in, you need to set a new password . Generated Temporary password Will record a copy in the log

Check the password ：

cat /var/log/mysqld.log

1.3.6 start-up MySQL, Check the status

# Add do not add .service Suffixes are OK 

 start-up ：systemctl start mysqld.service

 close ：systemctl stop mysqld.service

 restart ：systemctl restart mysqld.service

 Check the status ：systemctl status mysqld.service

mysqld This executable represents MySQL Server program , Running this executable file can directly start a
Server process .

Check the process ：

ps -ef | grep -i mysql

1.3.7 see MySQL Whether the service starts automatically 【 Don't move under normal conditions 】

systemctl list-unit-files|grep mysqld.service

If not enabled You can run the following command to set the auto start

systemctl enable mysqld.service

If you want to avoid self starting , Run the following command

systemctl disable mysqld.service

1.4 MySQL Sign in

1.4.1 First landing

adopt mysql -uroot -p Log in , stay Enter password： Enter the initialization password

1.4.2 Change Password

• Because the initialization password expires by default , So checking the database will report an error
• More complicated , If it is not too simple, an error will be reported

ALTER USER 'root'@'localhost' IDENTIFIED BY 'new_password';