Centos7安装MySQL
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MariaDB数据库管理系统是MySQL的一个分支，主要由开源社区在维护，采用GPL授权许可；
MariaDB的目的是完全兼容MySQL，包括API和命令行，使之能轻松成为MySQL的代替品。
Centos7默认安装mariadb，所以yum install -y mysql*时安装的就不是MySQL了。
那么如何实现安装MySQL而非Mariadb呢？
- 卸载mariadb
列出所有被安装的rpm package
[root@localhost install]# rpm -qa | grep mariadbmariadb-libs-5.5.52-1.el7.x86_64mariadb-5.5.52-1.el7.x86_64mariadb-bench-5.5.52-1.el7.x86_64mariadb-devel-5.5.52-1.el7.x86_64mariadb-embedded-devel-5.5.52-1.el7.x86_64mariadb-embedded-5.5.52-1.el7.x86_64mariadb-server-5.5.52-1.el7.x86_64mariadb-test-5.5.52-1.el7.x86_64卸载
[root@localhost install]# yum -y remove mariadb*Loaded plugins: fastestmirror, langpacksResolving Dependencies--> Running transaction check---> Package mariadb.x86_64 1:5.5.52-1.el7 will be erased---> Package mariadb-bench.x86_64 1:5.5.52-1.el7 will be erased---> Package mariadb-devel.x86_64 1:5.5.52-1.el7 will be erased---> Package mariadb-embedded.x86_64 1:5.5.52-1.el7 will be erased---> Package mariadb-embedded-devel.x86_64 1:5.5.52-1.el7 will be erased---> Package mariadb-libs.x86_64 1:5.5.52-1.el7 will be erased--> Processing Dependency: libmysqlclient.so.18()(64bit) for package: perl-DBD-MySQL-4.023-5.el7.x86_64--> Processing Dependency: libmysqlclient.so.18()(64bit) for package: 2:postfix-2.10.1-6.el7.x86_64--> Processing Dependency: libmysqlclient.so.18(libmysqlclient_18)(64bit) for package: perl-DBD-MySQL-4.023-5.el7.x86_64--> Processing Dependency: libmysqlclient.so.18(libmysqlclient_18)(64bit) for package: 2:postfix-2.10.1-6.el7.x86_64---> Package mariadb-server.x86_64 1:5.5.52-1.el7 will be erased---> Package mariadb-test.x86_64 1:5.5.52-1.el7 will be erased--> Running transaction check---> Package perl-DBD-MySQL.x86_64 0:4.023-5.el7 will be erased---> Package postfix.x86_64 2:2.10.1-6.el7 will be erased--> Finished Dependency ResolutionDependencies Resolved=================================================================================================================== Package Arch Version Repository Size===================================================================================================================Removing: mariadb x86_64 1:5.5.52-1.el7 @base 48 M mariadb-bench x86_64 1:5.5.52-1.el7 @base 2.6 M mariadb-devel x86_64 1:5.5.52-1.el7 @base 3.3 M mariadb-embedded x86_64 1:5.5.52-1.el7 @base 14 M mariadb-embedded-devel x86_64 1:5.5.52-1.el7 @base 27 M mariadb-libs x86_64 1:5.5.52-1.el7 @anaconda 4.4 M mariadb-server x86_64 1:5.5.52-1.el7 @base 56 M mariadb-test x86_64 1:5.5.52-1.el7 @base 124 MRemoving for dependencies: perl-DBD-MySQL x86_64 4.023-5.el7 @base 323 k postfix x86_64 2:2.10.1-6.el7 @anaconda 12 MTransaction Summary===================================================================================================================Remove 8 Packages (+2 Dependent packages)Installed size: 292 MDownloading packages:Running transaction checkRunning transaction testTransaction test succeededRunning transaction Erasing : 1:mariadb-embedded-devel-5.5.52-1.el7.x86_64 1/10 Erasing : 1:mariadb-test-5.5.52-1.el7.x86_64 2/10 Erasing : 1:mariadb-devel-5.5.52-1.el7.x86_64 3/10 Erasing : 1:mariadb-bench-5.5.52-1.el7.x86_64 4/10 Erasing : 1:mariadb-server-5.5.52-1.el7.x86_64 5/10 warning: /var/log/mariadb/mariadb.log saved as /var/log/mariadb/mariadb.log.rpmsave Erasing : 1:mariadb-5.5.52-1.el7.x86_64 6/10 Erasing : perl-DBD-MySQL-4.023-5.el7.x86_64 7/10 Erasing : 2:postfix-2.10.1-6.el7.x86_64 8/10 Erasing : 1:mariadb-libs-5.5.52-1.el7.x86_64 9/10 Erasing : 1:mariadb-embedded-5.5.52-1.el7.x86_64 10/10 Verifying : 1:mariadb-test-5.5.52-1.el7.x86_64 1/10 Verifying : 1:mariadb-5.5.52-1.el7.x86_64 2/10 Verifying : 1:mariadb-embedded-devel-5.5.52-1.el7.x86_64 3/10 Verifying : 1:mariadb-server-5.5.52-1.el7.x86_64 4/10 Verifying : 1:mariadb-libs-5.5.52-1.el7.x86_64 5/10 Verifying : 1:mariadb-devel-5.5.52-1.el7.x86_64 6/10 Verifying : 1:mariadb-bench-5.5.52-1.el7.x86_64 7/10 Verifying : 2:postfix-2.10.1-6.el7.x86_64 8/10 Verifying : perl-DBD-MySQL-4.023-5.el7.x86_64 9/10 Verifying : 1:mariadb-embedded-5.5.52-1.el7.x86_64 10/10 Removed: mariadb.x86_64 1:5.5.52-1.el7 mariadb-bench.x86_64 1:5.5.52-1.el7 mariadb-devel.x86_64 1:5.5.52-1.el7 mariadb-embedded.x86_64 1:5.5.52-1.el7 mariadb-embedded-devel.x86_64 1:5.5.52-1.el7 mariadb-libs.x86_64 1:5.5.52-1.el7 mariadb-server.x86_64 1:5.5.52-1.el7 mariadb-test.x86_64 1:5.5.52-1.el7 Dependency Removed: perl-DBD-MySQL.x86_64 0:4.023-5.el7 postfix.x86_64 2:2.10.1-6.el7 Complete!2.安装MySQL
先安装带有当前可用的mysql5系列社区版资源的rpm包：
[root@localhost /]# rpm -Uvh http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpmRetrieving http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpmPreparing... ################################# [100%]Updating / installing... 1:mysql-community-release-el7-5 ################################# [100%]再查看当前可用的mysql安装资源：
[root@localhost /]# yum repolist enabled | grep "mysql.*-community.*"mysql-connectors-community/x86_64 MySQL Connectors Community 36mysql-tools-community/x86_64 MySQL Tools Community 47mysql56-community/x86_64 MySQL 5.6 Community Server 327直接用yum方式安装了MySQL5.6版本了：
[root@localhost /]# yum -y install mysql-community-serverLoaded plugins: fastestmirror, langpacksLoading mirror speeds from cached hostfile * base: mirrors.btte.net * extras: mirrors.btte.net * updates: mirrors.163.com......Dependencies Resolved=============================================================================================================================================================================================== Package Arch Version Repository Size===============================================================================================================================================================================================Installing: mysql-community-server x86_64 5.6.36-2.el7 mysql56-community 59 MInstalling for dependencies: mysql-community-client x86_64 5.6.36-2.el7 mysql56-community 19 M mysql-community-common x86_64 5.6.36-2.el7 mysql56-community 257 k mysql-community-libs x86_64 5.6.36-2.el7 mysql56-community 2.0 MTransaction Summary===============================================================================================================================================================================================Install 1 Package (+3 Dependent packages)Total download size: 81 MInstalled size: 351 MDownloading packages:warning: /var/cache/yum/x86_64/7/mysql56-community/packages/mysql-community-common-5.6.36-2.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY0.0 B/s | 0 B --:--:-- ETA Public key for mysql-community-common-5.6.36-2.el7.x86_64.rpm is not installed(1/4): mysql-community-common-5.6.36-2.el7.x86_64.rpm | 257 kB 00:00:00 (2/4): mysql-community-libs-5.6.36-2.el7.x86_64.rpm | 2.0 MB 00:00:04 (3/4): mysql-community-client-5.6.36-2.el7.x86_64.rpm | 19 MB 00:01:19 (4/4): mysql-community-server-5.6.36-2.el7.x86_64.rpm | 59 MB 00:02:06 -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------Total 632 kB/s | 81 MB 00:02:11 R...... Installing : mysql-community-common-5.6.36-2.el7.x86_64 1/4 Installing : mysql-community-libs-5.6.36-2.el7.x86_64 2/4 Installing : mysql-community-client-5.6.36-2.el7.x86_64 3/4 Installing : mysql-community-server-5.6.36-2.el7.x86_64 4/4 Verifying : mysql-community-server-5.6.36-2.el7.x86_64 1/4 Verifying : mysql-community-common-5.6.36-2.el7.x86_64 2/4 Verifying : mysql-community-libs-5.6.36-2.el7.x86_64 3/4 Verifying : mysql-community-client-5.6.36-2.el7.x86_64 4/4 Installed: mysql-community-server.x86_64 0:5.6.36-2.el7 Dependency Installed: mysql-community-client.x86_64 0:5.6.36-2.el7 mysql-community-common.x86_64 0:5.6.36-2.el7 mysql-community-libs.x86_64 0:5.6.36-2.el7 Complete!3.配置
[root@localhost /]# systemctl enable mysqld[root@localhost /]# systemctl start mysqld[root@localhost /]# mysql_secure_installation4.登录MySQL
[root@localhost /]# mysql -uroot -p阅读全文
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