本文记录了RHEL7.5下mysql 8.0.11安装教程，具体内容如下
首先去mysql官网下载mysql-8.0.11-el7-x86_64.tar 解压。
由于mysql初始化、启动都需要用到mysql用户，所以创建一个mysql用户：
| useradd -d /home/mysql -m -s /bin/bash mysql |
经过测试发现系统中装有mariadb相关的mysql启动的时候会报错，于是卸载和mariadb相关的包。
| [root@rhel mysql]# yum remove mariadb*Loaded plugins: axelget, fastestmirror, langpacks, product-id, search-disabled- : repos, subscription-managerThis system is not registered with an entitlement server. You can use subscription-manager to register.Resolving Dependencies--> Running transaction check---> Package mariadb-libs.x86_64 1:5.5.56-2.el7 will be erased--> 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: 2:postfix-2.10.1-6.el7.x86_64--> Running transaction check---> Package postfix.x86_64 2:2.10.1-6.el7 will be erased--> Finished Dependency Resolutionepel/x86_64/group_gz | 266 kB 00:00 Dependencies Resolved================================================================================ Package Arch Version Repository Size================================================================================Removing: mariadb-libs x86_64 1:5.5.56-2.el7 @base 4.4 MRemoving for dependencies: postfix x86_64 2:2.10.1-6.el7 @base 12 MTransaction Summary================================================================================Remove 1 Package (+1 Dependent package)Installed size: 17 MIs this ok [y/N]: yDownloading packages:Running transaction checkRunning transaction testTransaction test succeededRunning transaction Erasing : 2:postfix-2.10.1-6.el7.x86_64 1/2 Erasing : 1:mariadb-libs-5.5.56-2.el7.x86_64 2/2 No metadata available for baseNo metadata available for codeNo metadata available for epelNo metadata available for extrasNo metadata available for updatesLoading mirror speeds from cached hostfile * base: mirrors.aliyun.com * epel: mirrors.ustc.edu.cn * extras: mirrors.aliyun.com * updates: mirrors.aliyun.comepel/x86_64/primary_db | 6.3 MB 00:01 Verifying : 1:mariadb-libs-5.5.56-2.el7.x86_64 1/2 Verifying : 2:postfix-2.10.1-6.el7.x86_64 2/2 Removed: mariadb-libs.x86_64 1:5.5.56-2.el7 Dependency Removed: postfix.x86_64 2:2.10.1-6.el7 Complete! |
使用如下命令初始化数据库，会在把/var/lib/mysql作为data文件的目录：
| shell> bin/mysqld --initialize --user=mysql |
于是我们可以在初始化的时候指定相应的文件目录：
| bin/mysqld --initialize --basedir=/home/mysql --datadir=/home/mysql/data --user=mysql |
初始化的时候，会生成一个临时的密码，记住该密码，等登录到mysql的时候需要用这个密码，进去后再次修改密码。
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