#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 (已安装) postfix-2:2.10.1-6.el7.x86_64 需要
libmysqlclient.so.18(libmysqlclient_18)(64bit) 被 (已安装) 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 syntaxcheck 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)]>
Linux下完整的MySQL开发需要安装服务器端，如果安装客户端也没什么不好。直接在软件中心搜mysql,把client和server选上。环境说明：ubuntu 10.04.2QtSDK (1.5G安装包的那个)mysql5.11.安装MySQLLinux下完整的MySQL开发需要安装服务器端，如果安装客户端也没什么不好。直接在软件中心搜mysql,把client和server选上。server在安装时会提示为root用户设置密码，设一个好了。我使用的是mysql5.1版本，用户名密码存储在一个叫mysql的数据库里，只有管理员级别才能看到。如果直接在终端中输入 mysql，可能会提示ERROR 1045 (28000)，这是因为这时候你是以自己用户名访问数据库，而目前数据库中只有一个root用户。没关系，如果有必要，可以添加一个用户进去：mysql -uroot -p -- 以root用户登录grant usage on *.* to dummy@localhost-- 授权名为dummy的用户本地登录，这里换成自己的用户名就可以了不过这时候直接mysql只有普通的权限，创建数据库、 *** 作mysql都是不可以的，如果真有将其赋予管理员权限的需要，可以自己查阅有关资料。2.安装Qt的MySQL驱动。方法一：直接sudo apt-get install libqt4-sql-mysql ,这是Qt4的mysql驱动，就不用自己费劲编译了，不过可能会额外下载一些东西。将 /usr/lib/qt4/plugins/sqldrivers/libqsqlmysql.so拷贝到你的QtSDK sqldrivers目录下，我当时是直接用普通权限安装，目录为：~/QtSDK/Desktop/Qt/473/gcc/plugins/sqldrivers方法二：其实你也可以sudo apt-get download libqt4-sql-mysql,把包解压缩，然后把里面的so文件搜出来直接拷贝到那里。方法三：乖乖按照官方方法编译，但是貌似可行性不大，因为新版本的QtSDK并没有src目录，默认也没有mysql的驱动。3.做个demo试一下记得在pro文件中 QT +=那里加上sql,否则qmake是不会去找sql的相关部分的复制代码代码如下:#include QtCore/QCoreApplication#include QSqlDatabase#include QDebugint main(int argc, char *argv[]){QCoreApplication a(argc, argv)QSqlDatabase db=QSqlDatabase::addDatabase("QMYSQL")db.setHostName("localhost")db.setDatabaseName("study")db.setUserName("root")db.setPassword("tyh")if(!db.open()){qDebug() "Unable to open database"}else{qDebug() "Database connection established"}return a.exec()}这里study这个数据库之前我已经创建过了，如果连接成功，就会显示Database connection established。 我是建立的控制台程序哈。 软件教程小编推荐： Linux安装配置MariaDB数据库全程详解 Linux系统怎么设置开机密码？ Linux启动菜单修改教程欢迎分享，转载请注明来源：内存溢出
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