网站建设是指使用标识语言（markup language)，通过一系列设计、建模、和执行的过程将电子格式的信息通过互联网传输，最终以图形用户界面（GUI）的形式被用户所浏览。简单来说，网页设计的目的就是产生网站。简单的信息如文字，图片（GIF，JPEG，PNG）和表格，都可以通过使超文件标示语言、可扩展超文本标记语言等标示语言放置到网站页面上。

　　以前的Linux系统中数据库大部分是mysql，不过自从被sun收购之后，就没用集成在centos这些开源Linux系统中了，那么如果想用的话就需要自己安装了，首先centos7 已经不支持mysql，因为收费了你懂得，所以内部集成了mariadb，而安装mysql的话会和mariadb的文件冲突，所以需要先卸载掉mariadb，以下为卸载mariadb，安装mysql的步骤。

　　#列出所有被安装的rpm package

　　rpm -qa grep mariadb

　　#卸载

　　rpm -e mariadb-libs-5.5.37-1.el7_0.x86_64

　　错误：依赖检测失败：

　　libmysqlclient.so.18()(64bit) 被 (已安裝) postfix-2:2.10.1-6.el7.x86_64 需要

　　libmysqlclient.so.18(libmysqlclient_18)(64bit) 被 (已安裝) postfix-2:2.10.1-6.el7.x86_64 需要

　　#强制卸载，因为没有--nodeps

　　rpm -e --nodeps mariadb-libs-5.5.37-1.el7_0.x86_64

　　#安装mysql5.5.39的rpm包

　　rpm -ivh /home/liwei/MySQL-server-5.5.39-2.el6.x86_64.rpm

　　rpm -ivh /home/liwei/MySQL-client-5.5.39-2.el6.x86_64.rpm

　　#拷贝配置文件

　　cp /usr/share/mysql/my-medium.cnf /etc/my.cnf，改名为my.cnf作为mysql配置文件。

　　#修改响应的配置文件

　　vim /etc/my.cnf

　　#把mysql的data拷贝到制定的目录

　　mv /var/lib/mysql　/home/mysql/data/

　　还要注意目录的属主和权限。

　　MYSQL启动后报：ERROR! The server quit without updating PID file错误的问题解决

　　1、权限不够：chown -R mysql:mysql /home/mysql/data” “chmod -R 755 /home/mysql/data

　　2、centos7的selinux问题：打开/etc/selinux/config，把SELINUX=enforcing改为SELINUX

　　centos7 安装 mariadb 的正确命令

　　使用的是linode的centos7系统，安装mysql发现已经默认的是mariadb。

　　但是不管是使用linode官网说明还是百度搜索到的的根本安装方法无法安装成功。

　　总是提示这一句：

　　ERROR 2002 (HY000): Can't connect to local Mysql server through socket '/var/lib/mysql/mysql.sock' (2)

　　最后通过google 搜索 install mariadb on centos 7得到了安装的关键一步。

　　现在安装成功，特此备注一下整个安装过程：

　　[php] view plaincopy在CODE上查看代码片派生到我的代码片

　　mysql:[root@localhost ~]# yum -y install mariadb*

　　Loaded plugins: fastestmirror

　　Loading mirror speeds from cached hostfile

　　* base: mirrors.linode.com

　　* extras: mirrors.linode.com

　　* updates: mirrors.linode.com

　　Resolving Dependencies

　　--> Running transaction check

　　---> Package mariadb.x86_64 1:5.5.37-1.el7_0 will be installed

　　---> Package mariadb-bench.x86_64 1:5.5.37-1.el7_0 will be installed

　　---> Package mariadb-devel.x86_64 1:5.5.37-1.el7_0 will be installed

　　---> Package mariadb-embedded.x86_64 1:5.5.37-1.el7_0 will be installed

　　---> Package mariadb-embedded-devel.x86_64 1:5.5.37-1.el7_0 will be installed

　　---> Package mariadb-libs.x86_64 1:5.5.37-1.el7_0 will be installed

　　---> Package mariadb-server.x86_64 1:5.5.37-1.el7_0 will be installed

　　--> Processing Dependency: perl-DBD-MySQL for package: 1:mariadb-server-5.5.37-1.el7_0.x86_64

　　---> Package mariadb-test.x86_64 1:5.5.37-1.el7_0 will be installed

　　--> Running transaction check

　　---> Package perl-DBD-MySQL.x86_64 0:4.023-5.el7 will be installed

　　--> Finished Dependency Resolution

　　Dependencies Resolved

　　=================================================================================

　　=========================

　　Package Arch Version Repository Size

　　=====================================================================================

　　=====================

　　Installing:

　　mariadb x86_64 1:5.5.37-1.el7_0 updates 8.9 M

　　mariadb-bench x86_64 1:5.5.37-1.el7_0 updates 385 k

　　mariadb-devel x86_64 1:5.5.37-1.el7_0 updates 744 k

　　mariadb-embedded x86_64 1:5.5.37-1.el7_0 updates 3.6 M

　　mariadb-embedded-devel x86_64 1:5.5.37-1.el7_0 updates 7.4 M

　　mariadb-libs x86_64 1:5.5.37-1.el7_0 updates 752 k

　　mariadb-server x86_64 1:5.5.37-1.el7_0 updates 11 M

　　mariadb-test x86_64 1:5.5.37-1.el7_0 updates 7.9 M

　　Installing for dependencies:

　　perl-DBD-MySQL x86_64 4.023-5.el7 base 140 k

　　Transaction Summary

　　==================================================================================

　　========================

　　Install 8 Packages (+1 Dependent package)

　　Total download size: 40 M

　　Installed size: 279 M

　　Downloading packages:

　　(1/9): mariadb-bench-5.5.37-1.el7_0.x86_64.rpm 385 kB 00:00:00

　　(2/9): mariadb-devel-5.5.37-1.el7_0.x86_64.rpm 744 kB 00:00:00

　　(3/9): mariadb-embedded-5.5.37-1.el7_0.x86_64.rpm 3.6 MB 00:00:00

　　(4/9): mariadb-5.5.37-1.el7_0.x86_64.rpm 8.9 MB 00:00:00

　　(5/9): mariadb-libs-5.5.37-1.el7_0.x86_64.rpm 752 kB 00:00:00

　　(6/9): mariadb-server-5.5.37-1.el7_0.x86_64.rpm 11 MB 00:00:00

　　(7/9): mariadb-embedded-devel-5.5.37-1.el7_0.x86_64.rpm 7.4 MB 00:00:00

　　(8/9): mariadb-test-5.5.37-1.el7_0.x86_64.rpm 7.9 MB 00:00:00

　　(9/9): perl-DBD-MySQL-4.023-5.el7.x86_64.rpm 140 kB 00:00:00

　　-------------------------------------------------------------------------

　　---------------------------------

　　Total 36 MB/s 40 MB 00:00:01

　　Running transaction check

　　Running transaction test

　　Transaction test succeeded

　　Running transaction

　　Installing : 1:mariadb-libs-5.5.37-1.el7_0.x86_64 1/9

　　Installing : 1:mariadb-5.5.37-1.el7_0.x86_64 2/9

　　Installing : perl-DBD-MySQL-4.023-5.el7.x86_64 3/9

　　Installing : 1:mariadb-server-5.5.37-1.el7_0.x86_64 4/9

　　Installing : 1:mariadb-devel-5.5.37-1.el7_0.x86_64 5/9

　　Installing : 1:mariadb-embedded-5.5.37-1.el7_0.x86_64 6/9

　　Installing : 1:mariadb-embedded-devel-5.5.37-1.el7_0.x86_64 7/9

　　Installing : 1:mariadb-test-5.5.37-1.el7_0.x86_64 8/9

　　Installing : 1:mariadb-bench-5.5.37-1.el7_0.x86_64 9/9

　　Verifying : 1:mariadb-test-5.5.37-1.el7_0.x86_64 1/9

　　Verifying : 1:mariadb-embedded-devel-5.5.37-1.el7_0.x86_64 2/9

　　Verifying : 1:mariadb-embedded-5.5.37-1.el7_0.x86_64 3/9

　　Verifying : 1:mariadb-libs-5.5.37-1.el7_0.x86_64 4/9

　　Verifying : 1:mariadb-bench-5.5.37-1.el7_0.x86_64 5/9

　　Verifying : 1:mariadb-5.5.37-1.el7_0.x86_64 6/9

　　Verifying : 1:mariadb-server-5.5.37-1.el7_0.x86_64 7/9

　　Verifying : perl-DBD-MySQL-4.023-5.el7.x86_64 8/9

　　Verifying : 1:mariadb-devel-5.5.37-1.el7_0.x86_64 9/9

　　Installed:

　　mariadb.x86_64 1:5.5.37-1.el7_0 mariadb-bench.x86_64 1:5.5.37-1.el7_0

　　mariadb-devel.x86_64 1:5.5.37-1.el7_0 mariadb-embedded.x86_64 1:5.5.37-1.el7_0

　　mariadb-embedded-devel.x86_64 1:5.5.37-1.el7_0 mariadb-libs.x86_64 1:5.5.37-1.el7_0

　　mariadb-server.x86_64 1:5.5.37-1.el7_0 mariadb-test.x86_64 1:5.5.37-1.el7_0

　　Dependency Installed:

　　perl-DBD-MySQL.x86_64 0:4.023-5.el7

　　Complete!

　　[root@localhost ~]# systemctl start mariadb.service

　　[root@localhost ~]# systemctl enable mariadb.service

　　ln -s '/usr/lib/systemd/system/mariadb.service' '/etc/systemd/system/multi-user.target.wants/mariadb.servi

　　ce'

　　[root@localhost ~]# mysql

　　Welcome to the MariaDB monitor. Commands end with ; or \g.

　　Your MariaDB connection id is 2

　　Server version: 5.5.37-MariaDB MariaDB Server

　　Copyright (c) 2000, 2014, Oracle, Monty Program Ab and others.

　　Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

　　MariaDB [(none)]> logout

　　-> exit

　　->

　　-> ;

　　ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaD

　　B server version for the right syntax to use near 'logout

　　exit' at line 1

　　MariaDB [(none)]> exit

　　Bye

　　[root@localhost ~]# systemctl enable mariadb.service

　　[root@localhost ~]# mysql

　　Welcome to the MariaDB monitor. Commands end with ; or \g.

　　Your MariaDB connection id is 3

　　Server version: 5.5.37-MariaDB MariaDB Server

　　Copyright (c) 2000, 2014, Oracle, Monty Program Ab and others.

　　Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

　　MariaDB [(none)]> show databases;

　　+--------------------+

　　 Database

　　+--------------------+

　　 information_schema

　　 mysql

　　 performance_schema

　　 test

　　+--------------------+

　　4 rows in set (0.00 sec)

　　MariaDB [(none)]> use test

　　Database changed

　　MariaDB [test]> show tables;

　　Empty set (0.00 sec)

　　MariaDB [test]> exit

　　Bye

　　[root@localhost ~]# mysql_secure_installation

　　/usr/bin/mysql_secure_installation: line 379: find_mysql_client: command not found

　　NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MariaDB

　　SERVERS IN PRODUCTION USE! PLEASE READ EACH STEP CAREFULLY!

　　In order to log into MariaDB to secure it, we'll need the current

　　password for the root user. If you've just installed MariaDB, and

　　you haven't set the root password yet, the password will be blank,

　　so you should just press enter here.

　　ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

　　Enter current password for root (enter for none):

　　OK, successfully used password, moving on...

　　Setting the root password ensures that nobody can log into the MariaDB

　　root user without the proper authorisation.

　　Set root password? [Y/n] y

　　New password:

　　Re-enter new password:

　　Password updated successfully!

　　Reloading privilege tables..

　　... Success!

　　By default, a MariaDB installation has an anonymous user, allowing anyone

　　to log into MariaDB without having to have a user account created for

　　them. This is intended only for testing, and to make the installation

　　go a bit smoother. You should remove them before moving into a

　　production environment.

　　Remove anonymous users? [Y/n] y

　　... Success!

　　Normally, root should only be allowed to connect from 'localhost'. This

　　ensures that someone cannot guess at the root password from the network.

　　Disallow root login remotely? [Y/n] y

　　... Success!

　　By default, MariaDB comes with a database named 'test' that anyone can

　　access. This is also intended only for testing, and should be removed

　　before moving into a production environment.

　　Remove test database and access to it? [Y/n] y

　　- Dropping test database...

　　... Success!

　　- Removing privileges on test database...

　　... Success!

　　Reloading the privilege tables will ensure that all changes made so far

　　will take effect immediately.

　　Reload privilege tables now? [Y/n] y

　　... Success!

　　Cleaning up...

　　All done! If you've completed all of the above steps, your MariaDB

　　installation should now be secure.

　　Thanks for using MariaDB!

　　[root@localhost ~]# mysql -uroot -p

　　Enter password:

　　Welcome to the MariaDB monitor. Commands end with ; or \g.

　　Your MariaDB connection id is 15

　　Server version: 5.5.37-MariaDB MariaDB Server

　　Copyright (c) 2000, 2014, Oracle, Monty Program Ab and others.

　　Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

　　MariaDB [(none)]> show databases;

　　+--------------------+

　　 Database

　　+--------------------+

　　 information_schema

　　 mysql

　　 performance_schema

　　 zbphp.com

　　+--------------------+

　　4 rows in set (0.00 sec)

　　MariaDB [(none)]>

绿茶
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