CentOS7默认数据库是mariadb, 但是 好多用的都是mysql ，但是CentOS7的yum源中默认好像是没有mysql的。
上一篇安装的是5.6的但是我想安装5.7的 yum安装是最简单的 尝试过编译安装各种问题，最后就决定用yum。
(经过一段时间的学习又写了一篇用源码安装mysql5.7.22的 点击打开链接)
1.卸载 先停掉mysql进程 没有安装过的可以直接跳过
| pkill -9 mysqld rpm -qa|grep -i mysql |
用命令 yum -y remove
| yum -y remove mysql-community-client-5.6.38-2.el7.x86_64 |
卸载不掉的用 rpm -ev
依次卸载 直到没有
2.下载mysql的repo源 这个安装的mysql5.7.20 /**纠正一下，这源下载的是最新的版本 ****/
| [root@localhost ~]# cd /usr/local/src/ [root@localhost src]# wget http://repo.mysql.com/mysql57-community-release-el7-8.noarch.rpm [root@localhost src]# rpm -ivh mysql57-community-release-el7-8.noarch.rpm [root@localhost src]# yum -y install mysql-server |
（也可以指定安装目录 yum --installroot=/usr/local/mysql --releasever=/ -y install mysql-server ）我没试，这样装环境变量配置都不用你管，装上直接启动就行。安装路径是默认的。
一路 y
根据步骤安装就可以了，
默认配置文件路径：
配置文件：/etc/my.cnf
日志文件：/var/log/var/log/mysqld.log
服务启动脚本：/usr/lib/systemd/system/mysqld.service
socket文件：/var/run/mysqld/mysqld.pid
配置 my.cnf vim /etc/my.cnf
| [mysqld] # # Remove leading # and set to the amount of RAM for the most important data # cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%. # innodb_buffer_pool_size = 128M # # Remove leading # to turn on a very important data integrity option: logging # changes to the binary log between backups. # log_bin # # Remove leading # to set options mainly useful for reporting servers. # The server defaults are faster for transactions and fast SELECTs. # Adjust sizes as needed, experiment to find the optimal values. # join_buffer_size = 128M # sort_buffer_size = 2M # read_rnd_buffer_size = 2M datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock server_id = 1 expire_logs_days = 3 # Disabling symbolic-links is recommended to prevent assorted security risks symbolic-links=0 log-error=/var/log/mysqld.log pid-file=/var/run/mysqld/mysqld.pid |
不过安装完成后，密码为随机密码，需要重置密码。
4. 启动mysql服务
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