1. Introduction to LAMP architecture:
Linux+ Apache（httpd）+ mysql + php
Operating system + external network service software + storage software + scripting language (developed by C)
PHP website
The three roles can be installed on one machine or separated, but httpd must be together with php (php is combined with apache in the form of modules, and apache deals with mysql through php)
Dynamic request: the user logs in to apache through the account and password, and apache goes to mysql to compare the data through php, and apache will return the login status to the user after matching
Static request: The user logs in through apache, and apache directly goes to a certain directory in Linux to get static files or pictures. not dealing with mysql
2. Introduction to mysql/mariaDB
mysql is a relational database. Developed by mysql ab company. Acquired by Sun in 2008. Sun company (java) was acquired by oracle (database) company in 2009. MySQL embarked on a commercial route. Official website: www.mysql.com has changed a lot since version 5.6. 5.7 performance has been greatly improved .
mariadb is a branch of mysql. The official website is www.mariadb.com, which was founded by the original author and most of the original team. mariadb5.5 corresponds to mysql5.5, and mysql5.6 corresponds to maiadb10.0.
Community open source version
enterprise Enterprise Edition
GA generic version, used in production environments
DMR development milestones (versions with major breakthroughs)
RC Release Candidate
Beta development test version (may have bugs)
Alpha internal beta version
3. Mysql installation
uname -a View current version information
[root@lnmp ~]# uname -a
Linux lnmp 3.10.0-514.el7.x86_64 #1 SMP Tue Nov 22 16:42:41 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
r.aminglinux
Installation: rpm (there is no way to customize the installation path), source code, binary compilation-free (you can customize the installation path)
Unzip the binary compilation-free package of mysql
tar zxvf mysql-5.6.36-linux-glibc2.5-x86_64.tar.gz
move him and rename him
mv mysql-5.6.36-linux-glibc2.5-x86_64 /usr/local/mysql
Switch to the /usr/local/mysql directory
create mysql user
useradd mysql
The default path for storing data files in the mysql database is /var/lib/mysql, but in practice, we often need to customize the installation database path during installation and create data
mkdir /data
./scripts/mysql_install_db --user=mysql --datadir=/data/mysql Generate database system, specify user as mysql, store database path under /data/
Copy the configuration file to /etc/my.cnf (the my.cnf file may already exist, it may be installed before, or it may be the configuration of other databases)
cp support-files/my-default.cnf /etc/my.cnf
Copy the mysql startup script and edit
cp support-files/mysql.server /etc/init.d/mysqld
vim /etc/init.d/mysqld
basedir=/usr/local/mysql specifies the mysql program directory
datadir=/data/mysql specifies the mysql storage data directory
Set permissions to 755 (sometimes the default is 755)
chmod 755 /etc/init.d/mysqld
If you want to boot, add it to the system service list
chkconfig --add mysqld add to system service list
chkconfig --list View system service list
service mysqld start / /etc/init.d/mysqld start is to start the mysql service
pa aux|grep mysql View process
netstat -lntp View listening ports
Another way to start MySQL, the ampersand means throw it to the background
killall mysqld kills the mysql process (don't use the kill command often)
MySQL common 2 engines
innodb is bigger and myisam is smaller
The difference between killall and kill Killall is very rational, it will end the process after the read and write is completed