参考：https://www.cnblogs.com/jimboi/p/6405560.html
1.下载rpm文件
wget https://dev.mysql.com/get/mysql57-community-release-el6-9.noarch.rpm
[root@hadoop110 /]# wget https://dev.mysql.com/get/mysql57-community-release-el6-9.noarch.rpm--2019-01-02 18:11:58-- https://dev.mysql.com/get/mysql57-community-release-el6-9.noarch.rpm
正在解析主机 dev.mysql.com... 137.254.60.11
正在连接 dev.mysql.com|137.254.60.11|:... 已连接。
已发出 HTTP 请求，正在等待回应... Found
位置：https://repo.mysql.com//mysql57-community-release-el6-9.noarch.rpm [跟随至新的 URL]
---- ::-- https://repo.mysql.com//mysql57-community-release-el6-9.noarch.rpm
正在解析主机 repo.mysql.com... 23.76.232.185
正在连接 repo.mysql.com|23.76.232.185|:... 已连接。
已发出 HTTP 请求，正在等待回应... OK
长度： (.0K) [application/x-redhat-package-manager]
正在保存至: “mysql57-community-release-el6-.noarch.rpm” %[===================================================>] , --.-K/s in 0s -- :: (52.9 MB/s) - 已保存 “mysql57-community-release-el6-.noarch.rpm” [/])
2.安装rpm包
rpm -Uvh mysql57-community-release-el6-9.noarch.rpm
[root@hadoop110 /]# rpm -Uvh mysql57-community-release-el6-.noarch.rpm
warning: mysql57-community-release-el6-.noarch.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Preparing... ########################################### [%]
:mysql57-community-relea########################################### [%]
安装成功后，会在/etc/yum.repos.d/下面多几个mysql的包
[root@hadoop110 /]# cd /etc/yum.repos.d/
[root@hadoop110 yum.repos.d]# ll
总用量
-rw-r--r--. root root 5月 CentOS-Base.repo
-rw-r--r--. root root 5月 CentOS-Debuginfo.repo
-rw-r--r--. root root 5月 CentOS-fasttrack.repo
-rw-r--r--. root root 5月 CentOS-Media.repo
-rw-r--r--. root root 5月 CentOS-Vault.repo
-rw-r--r--. root root 11月 epel.repo
-rw-r--r--. root root 11月 epel-testing.repo
-rw-r--r--. root root 9月 mysql-community.repo
-rw-r--r--. root root 9月 mysql-community-source.repo
3.安装mysql (此过程需要时间)
yum install mysql-community-server
[root@hadoop110 /]# yum install mysql-community-server
已加载插件：fastestmirror, refresh-packagekit, security
设置安装进程
Loading mirror speeds from cached hostfile
epel/metalink | 7.5 kB :
* base: mirrors.cqu.edu.cn
* epel: mirrors.huaweicloud.com
* extras: mirror.bit.edu.cn
* updates: mirrors.zju.edu.cn
base | 3.7 kB :
epel | 3.2 kB :
epel/primary | 3.2 MB :
epel /
extras | 3.4 kB :
mysql-connectors-community | 2.5 kB :
mysql-connectors-community/primary_db | kB :
mysql-tools-community | 2.5 kB :
mysql-tools-community/primary_db | kB :
mysql57-community | 2.5 kB :
mysql57-community/primary_db | kB :
updates | 3.4 kB :
解决依赖关系
--> 执行事务检查
---> Package mysql-community-server.x86_64 :5.7.-.el6 will be 安装
--> 处理依赖关系 mysql-community-common(x86-) = 5.7.-.el6，它被软件包 mysql-community-server-5.7.-.el6.x86_64 需要
--> 处理依赖关系 mysql-community-client(x86-) >= 5.7.，它被软件包 mysql-community-server-5.7.-.el6.x86_64 需要
--> 执行事务检查
---> Package mysql-community-client.x86_64 :5.7.-.el6 will be 安装
--> 处理依赖关系 mysql-community-libs(x86-) >= 5.7.，它被软件包 mysql-community-client-5.7.-.el6.x86_64 需要
---> Package mysql-community-common.x86_64 :5.7.-.el6 will be 安装
--> 执行事务检查
---> Package mysql-community-libs.x86_64 :5.7.-.el6 will be obsoleting
---> Package mysql-libs.x86_64 :5.1.-.el6 will be 取代
--> 处理依赖关系 libmysqlclient.so.()(64bit)，它被软件包 :postfix-2.6.-.el6_7..x86_64 需要
--> 处理依赖关系 libmysqlclient.so.(libmysqlclient_16)(64bit)，它被软件包 :postfix-2.6.-.el6_7..x86_64 需要
--> 执行事务检查
---> Package mysql-community-libs-compat.x86_64 :5.7.-.el6 will be obsoleting
---> Package postfix.x86_64 :2.6.-.el6_7. will be 升级
---> Package postfix.x86_64 :2.6.-.el6 will be an update
--> 完成依赖关系计算 依赖关系解决 =============================================================================================
软件包 架构 版本 仓库 大小
=============================================================================================
正在安装:
mysql-community-libs x86_64 5.7.-.el6 mysql57-community 2.1 M
replacing mysql-libs.x86_64 5.1.-.el6
mysql-community-libs-compat x86_64 5.7.-.el6 mysql57-community 1.6 M
replacing mysql-libs.x86_64 5.1.-.el6
mysql-community-server x86_64 5.7.-.el6 mysql57-community M
为依赖而安装:
mysql-community-client x86_64 5.7.-.el6 mysql57-community M
mysql-community-common x86_64 5.7.-.el6 mysql57-community k
为依赖而更新:
postfix x86_64 :2.6.-.el6 base 2.0 M 事务概要
=============================================================================================
Install Package(s)
Upgrade Package(s) 总下载量： M
确定吗？[y/N]：y
下载软件包：
(/): mysql-community-client-5.7.-.el6.x86_64.rpm | MB :
(/): mysql-community-common-5.7.-.el6.x86_64.rpm | kB :
(/): mysql-community-libs-5.7.-.el6.x86_64.rpm | 2.1 MB :
(/): mysql-community-libs-compat-5.7.-.el6.x86_64.rpm | 1.6 MB :
(/): mysql-community-server-5.7.-.el6.x86_64.rpm | MB :
(/): postfix-2.6.-.el6.x86_64.rpm | 2.0 MB :
---------------------------------------------------------------------------------------------
总计 kB/s | MB :
warning: rpmts_HdrFromFdno: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
Importing GPG key 0x5072E1F5:
Userid : MySQL Release Engineering <mysql-build@oss.oracle.com>
Package: mysql57-community-release-el6-.noarch (installed)
From : /etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
确定吗？[y/N]：y
运行 rpm_check_debug
执行事务测试
事务测试成功
执行事务
Warning: RPMDB altered outside of yum.
正在安装 : mysql-community-common-5.7.-.el6.x86_64 /
正在安装 : mysql-community-libs-5.7.-.el6.x86_64 /
正在安装 : mysql-community-client-5.7.-.el6.x86_64 /
正在安装 : mysql-community-libs-compat-5.7.-.el6.x86_64 /
正在升级 : :postfix-2.6.-.el6.x86_64 /
正在安装 : mysql-community-server-5.7.-.el6.x86_64 /
清理 : :postfix-2.6.-.el6_7..x86_64 /
正在删除 : mysql-libs-5.1.-.el6.x86_64 /
Verifying : :postfix-2.6.-.el6.x86_64 /
Verifying : mysql-community-common-5.7.-.el6.x86_64 /
Verifying : mysql-community-server-5.7.-.el6.x86_64 /
Verifying : mysql-community-client-5.7.-.el6.x86_64 /
Verifying : mysql-community-libs-compat-5.7.-.el6.x86_64 /
Verifying : mysql-community-libs-5.7.-.el6.x86_64 /
Verifying : mysql-libs-5.1.-.el6.x86_64 /
Verifying : :postfix-2.6.-.el6_7..x86_64 / 已安装:
mysql-community-libs.x86_64 :5.7.-.el6
mysql-community-libs-compat.x86_64 :5.7.-.el6
mysql-community-server.x86_64 :5.7.-.el6 作为依赖被安装:
mysql-community-client.x86_64 :5.7.-.el6 mysql-community-common.x86_64 :5.7.-.el6 作为依赖被升级:
postfix.x86_64 :2.6.-.el6 替代:
mysql-libs.x86_64 :5.1.-.el6 完毕！
4.开启mysql服务
[root@hadoop110 /]# service mysqld start
初始化 MySQL 数据库： [失败]
[root@hadoop110 /]# service mysqld start
正在启动 mysqld： [确定] //正常启动
5.mysql安装完成会创建临时默认的超级用户，密码存储在/var/log/mysqld.log，命令查看密码：
grep 'temporary password' /var/log/mysqld.log
[root@hadoop110 /]# grep 'temporary password' /var/log/mysqld.log
--02T10::.765238Z [Note] A temporary password is generated for root@localhost: ??dyl3Uduj (密码)
6.使用默认用户'root'@'localhost'登录数据库并且修改密码：
[root@hadoop110 /]# mysql -u root -p
[root@hadoop110 /]# mysql -u root -p
Enter password: （上面的密码）
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is
Server version: 5.7. Copyright (c) , , Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
修改密码：
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY '';
Query OK, rows affected (0.00 sec)
注意：如果出现错误提示： ERROR (HY000): Your password does not satisfy the current policy requirements 这个是因为密码过于简单，密码必须符合长度，包含数字、大写小写字母、特殊字符。
7.开启远程连接
1）.设置防火墙iptables开放3306接口
在/etc/sysconfig下面有个iptables文件，在倒数第二行添加端口就可以
在控制台输入：
iptables -I INPUT -p tcp --dport -j ACCEPT [root@hadoop110 /]# iptables -I INPUT -p tcp --dport 3306 -j ACCEPT
2）.然后进行保存：
[root@hadoop110 /]# service iptables save
iptables：将防火墙规则保存到 /etc/sysconfig/iptables： [确定]
更新防火墙规则：service iptables restart
删除：iptables -D INPUT -p tcp --dport 3306 -j ACCEPT
8.修改mysql权限，将localhost修改为%
1).登录mysql
mysql -u root -p
2).登录到 mysql 这个表
mysql> use mysql;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A Database changed
3)..将root的host修改为%
mysql> update user set host = '%' where user ='root';
Query OK, row affected (0.01 sec)
Rows matched: Changed: Warnings:
4).重新加载权限
mysql> flush privileges;
Query OK, rows affected (0.00 sec)
5).输入：
mysql> select host,user from user where user='root';
+------+------+
| host | user |
+------+------+
| % | root |
+------+------+
row in set (0.00 sec)
9.Navicat 远程连接