最近在学习prometheus （普罗米修斯）监控主机、mysql、redis、容器等实操，今天在学习prometheus如何监控mysql主从库实操，在安装mysql数据库的时候发现网上很多教程的mysql在线安装地址要么超时要么已经不能使用，因为之前我centos7 的yum仓库地址已经改成阿里云的镜像站了，所以我试着从阿里云的镜像站下载安装mysql应该是最快的。
本篇就是根据自己的实际操作写的在阿里云yum下载安装你的mysql数据库
操作系统：centos 7
数据库版本：mysql5.7
第一步:更换yum源为阿里云yum
1.备份原始的CentOS-Base.repo
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup2.下载新的 CentOS-Base.repo 到 /etc/yum.repos.d/
centos7 如果wget命令不能使用可以curl命令去下载，2个命令选一个执行即可
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repocurl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo3、更新本地缓存
yum clean all
yum makecache
第二步：查看删除系统已安装的mysql数据库防止冲突
1.查看系统中是否自带安装mysql
yum list installed | grep mysql
2.删除系统自带的mysql及其依赖（防止冲突）
yum -y remove + 文件名
第三步：下载mysql数据库版本安装
1.如果你的centos没有wget命令可以先安装
yum install wget -y
2.到阿里云镜像站选择自己的mysql版本然后选择下载对应的rpm文件
MySQL版本
3.我这边选择安装mysql5.7.3.5的版本，右键选择复制地址
4.开始下载rpm文件
wget https://mirrors.aliyun.com/mysql/MySQL-5.7/mysql-community-server-5.7.35-1.el7.x86_64.rpm
可以看到阿里的下载速度还是很快的，6MB/S的下载速度
5.安装mysql
rpm -ivh mysql-community-server-5.7.35-1.el7.x86_64.rpm安装提示有错误
rpm -ivh mysql-community-server-5.7.35-1.el7.x86_64.rpmwarning: mysql-community-server-5.7.35-1.el7.x86_64.rpm: Header V3 DSA/SHA256 Signature, key ID 5072e1f5: NOKEYerror: Failed dependencies: mysql-community-client(x86-64) >= 5.7.9 is needed by mysql-community-server-5.7.35-1.el7.x86_64 mysql-community-common(x86-64) = 5.7.35-1.el7 is needed by mysql-community-server-5.7.35-1.el7.x86_64 net-tools is needed by mysql-community-server-5.7.35-1.el7.x86_64主要就是提示缺少依赖，那我们就把相应的依赖包也一并下载下来
mysql-community-libs-5.7.35-1.el7.x86_64.rpm
mysql-community-client-5.7.35-1.el7.x86_64.rpm
mysql-community-common-5.7.35-1.el7.x86_64.rpm
net-tools
先安装net-tools 你可以直接使用yum -y install net-tools 直接安装
开始安装依赖包：
rpm -ivh https://mirrors.aliyun.com/mysql/MySQL-5.7/mysql-community-common-5.7.35-1.el7.x86_64.rpmrpm -ivh https://mirrors.aliyun.com/mysql/MySQL-5.7/mysql-community-libs-5.7.35-1.el7.x86_64.rpmrpm -ivh https://mirrors.aliyun.com/mysql/MySQL-5.7/mysql-community-client-5.7.35-1.el7.x86_64.rpm在安装依赖的时候可能会提示跟mariadb-libs 的库文件冲突，我们先删除系统里的mariadb数据库
删除mariadb
rpm -qa |grep mariadbmariadb-libs-5.5.65-1.el7.x86_64yum remove mariadb-libs-5.5.65-1.el7.x86_64删除完后继续安装上面的几个依赖包安装完以后就可以安装最开始那个
rpm -ivh mysql-community-server-5.7.35-1.el7.x86_64.rpm
安装进度
进度跳走完我们的mysql已经安装完了
第四步：开启mysql并做配置
启动mysql服务并设置开机启动
systemctl start mysqld查看mysql状态
systemctl status mysqld
mysql已经正常在运行了
设置开机自动启动
chkconfig mysqld on获取mysql的临时密码
grep "password" /var/log/mysqld.log
红框里的就是临时密码
使用临时密码登录
修改密码
ALTER USER 'root'@'localhost' IDENTIFIED BY '新密码';设置字符集为utf-8
查询 mysql 字符集：
show variables like 'chara%';
编辑 my.cnf 文件：vim /etc/my.cnf
[client] default-character-set=utf8[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 # 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 default-storage-engine=INNODB character-set-server=utf8 collation-server=utf8_general_ci
保存退出后重启mysql
重启mysql服务：systemctl restart mysqld