CentOS 7 配置java web 环境(安装mysql数据库)

虽然关于服务器的配置网上有很多，但大多都有各种问题，服务器提供商不同。

没办法，所以自己记录一下

一丶配置mysql数据库

rpm -qa|grep -i mysql

查看服务器中有没有安装mysql，如果如下图所示，则没有。如果有安装，需要删除卸载后再安装，卸载方法自行百度

创建mysql路径并cd过去，如下图所示

运行以下 三条下载安装命令

wget http://repo.mysql.com/mysql57-community-release-el7-8.noarch.rpm 

rpm -ivh mysql57-community-release-el7-8.noarch.rpm 

yum -y install mysql-server 

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

执行以下命令安装vim工具

yum install -y vim*

配置  my.cnf       

vim /etc/my.cnf

# 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

按i进入编辑模式，改完后按Esa，再按住Shift+两下Z保存并退出

启动mysql服务

service mysqld restart

grep "password" /var/log/mysqld.log   

root@localhost: 后面既是密码

输入查找到的密码登录

alter user 'root'@'localhost' identified by '修改后密码';  

CREATE USER 'koow'@'%' IDENTIFIED BY '注册用户密码';

grant all on *.* to '赋予权限的用户名'@'%' identified by '用户名密码'  with grant option;



flush privileges;

exit;

以上就是mysql安装全过程，默认端口号3306