CDH中的MySQL升级（RPM包方式）
1.下载官网的5.7中最新的版本，地址：MySQL 5.7.41 rpm下载地址
2.解压下载的tar包：tar -xvf mysql-5.7.41-1.el7.x86_64.rpm-bundle.tar
3.备份数据库
3.1 先停止MySQL服务：systemctl stop mysqld
3.2 备份数据：升级MySQL通常不会丢失数据，但保险起见，我们需要做这一步。输入命令
mysqldump -u root -h xxx -P 3306 -p --all-databases > databases.sql
备份配置文件：
cp /etc/my.cnf /etc/my.cnf.bak
4.卸载旧版本 MySQL
[root@cdh01 mysql]# yum remove mysql mysql-*
Loaded plugins: security
Setting up Remove Process
Resolving Dependencies
--> Running transaction check
---> Package mysql.i686 0:5.1.73-7.el6 will be erased
---> Package mysql-libs.i686 0:5.1.73-7.el6 will be erased
--> Processing Dependency: libmysqlclient.so.16 for package: 2:postfix-2.6.6-6.el6_7.1.i686
--> Processing Dependency: libmysqlclient.so.16 for package: perl-DBD-MySQL-4.013-3.el6.i686
--> Processing Dependency: libmysqlclient.so.16(libmysqlclient_16) for package: 2:postfix-2.6.6-6.el6_7.1.i686
--> Processing Dependency: libmysqlclient.so.16(libmysqlclient_16) for package: perl-DBD-MySQL-4.013-3.el6.i686
--> Processing Dependency: mysql-libs for package: 2:postfix-2.6.6-6.el6_7.1.i686
---> Package mysql-server.i686 0:5.1.73-7.el6 will be erased
--> Running transaction check
---> Package perl-DBD-MySQL.i686 0:4.013-3.el6 will be erased
---> Package postfix.i686 2:2.6.6-6.el6_7.1 will be erased
--> Processing Dependency: /usr/sbin/sendmail for package: cronie-1.4.4-16.el6_8.2.i686
--> Processing Dependency: /usr/sbin/sendmail for package: redhat-lsb-core-4.0-7.el6.centos.i686
--> Running transaction check
---> Package cronie.i686 0:1.4.4-16.el6_8.2 will be erased
--> Processing Dependency: cronie = 1.4.4-16.el6_8.2 for package: cronie-anacron-1.4.4-16.el6_8.2.i686
---> Package redhat-lsb-core.i686 0:4.0-7.el6.centos will be erased
--> Running transaction check
---> Package cronie-anacron.i686 0:1.4.4-16.el6_8.2 will be erased
--> Processing Dependency: /etc/cron.d for package: crontabs-1.10-33.el6.noarch
--> Processing Dependency: /etc/cron.d for package: sysstat-9.0.4-31.el6.i686
--> Restarting Dependency Resolution with new changes.
--> Running transaction check
---> Package crontabs.noarch 0:1.10-33.el6 will be erased
---> Package sysstat.i686 0:9.0.4-31.el6 will be erased
--> Finished Dependency Resolution
Dependencies Resolved
=======================================================================================================================================================================================================
Package Arch Version Repository Size
=======================================================================================================================================================================================================
Removing:
mysql i686 5.1.73-7.el6 @base 2.3 M
mysql-libs i686 5.1.73-7.el6 @base 3.9 M
mysql-server i686 5.1.73-7.el6 @base 24 M
Removing for dependencies:
cronie i686 1.4.4-16.el6_8.2 @updates 169 k
cronie-anacron i686 1.4.4-16.el6_8.2 @updates 38 k
crontabs noarch 1.10-33.el6 @anaconda-CentOS-201311291201.i386/6.5 2.4 k
perl-DBD-MySQL i686 4.013-3.el6 @base 341 k
postfix i686 2:2.6.6-6.el6_7.1 @base 9.3 M
redhat-lsb-core i686 4.0-7.el6.centos @anaconda-CentOS-201311291201.i386/6.5 22 k
sysstat i686 9.0.4-31.el6 @base 804 k
Transaction Summary
=======================================================================================================================================================================================================
Remove 10 Package(s)
Installed size: 41 M
Is this ok [y/N]: y
Downloading Packages:
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Erasing : mysql-server-5.1.73-7.el6.i686 1/10
warning: /var/log/mysqld.log saved as /var/log/mysqld.log.rpmsave
Erasing : redhat-lsb-core-4.0-7.el6.centos.i686 2/10
/var/tmp/rpm-tmp.Y5QGjy: line 1: lsb_release: command not found
Erasing : mysql-5.1.73-7.el6.i686 3/10
Erasing : perl-DBD-MySQL-4.013-3.el6.i686 4/10
Erasing : sysstat-9.0.4-31.el6.i686 5/10
Erasing : crontabs-1.10-33.el6.noarch 6/10
Erasing : cronie-anacron-1.4.4-16.el6_8.2.i686 7/10
Erasing : cronie-1.4.4-16.el6_8.2.i686 8/10
Erasing : 2:postfix-2.6.6-6.el6_7.1.i686 9/10
Erasing : mysql-libs-5.1.73-7.el6.i686 10/10
Verifying : redhat-lsb-core-4.0-7.el6.centos.i686 1/10
Verifying : perl-DBD-MySQL-4.013-3.el6.i686 2/10
Verifying : mysql-server-5.1.73-7.el6.i686 3/10
Verifying : crontabs-1.10-33.el6.noarch 4/10
Verifying : sysstat-9.0.4-31.el6.i686 5/10
Verifying : cronie-anacron-1.4.4-16.el6_8.2.i686 6/10
Verifying : cronie-1.4.4-16.el6_8.2.i686 7/10
Verifying : mysql-libs-5.1.73-7.el6.i686 8/10
Verifying : mysql-5.1.73-7.el6.i686 9/10
Verifying : 2:postfix-2.6.6-6.el6_7.1.i686 10/10
Removed:
mysql.i686 0:5.1.73-7.el6 mysql-libs.i686 0:5.1.73-7.el6 mysql-server.i686 0:5.1.73-7.el6
Dependency Removed:
cronie.i686 0:1.4.4-16.el6_8.2 cronie-anacron.i686 0:1.4.4-16.el6_8.2 crontabs.noarch 0:1.10-33.el6 perl-DBD-MySQL.i686 0:4.013-3.el6 postfix.i686 2:2.6.6-6.el6_7.1
redhat-lsb-core.i686 0:4.0-7.el6.centos sysstat.i686 0:9.0.4-31.el6
Complete!
至此MySQL就卸载完成了，我们可以检查一下系统中是否还有 MySQL 相关内容没有删除干净
[root@cdh01 mysql]# yum list installed | grep mysql
[root@cdh01 mysql]#
上面的情况是没有未删除部分，如果有的话可通过下面的命令删除：
yum remove mysql 进行卸载（这里的mysql就是上面命令的运行结果）
5.安装新版本MySQL
依次执行以下6个命令进行安装
rpm -ivh mysql-community-common-5.7.41-1.el7.x86_64.rpm --nodeps --force
rpm -ivh mysql-community-libs-5.7.41-1.el7.x86_64.rpm --nodeps --force
rpm -ivh mysql-community-libs-compat-5.7.41-1.el7.x86_64.rpm --nodeps --force
rpm -ivh mysql-community-devel-5.7.41-1.el7.x86_64.rpm --nodeps --force
rpm -ivh mysql-community-client-5.7.41-1.el7.x86_64.rpm --nodeps --force
rpm -ivh mysql-community-server-5.7.41-1.el7.x86_64.rpm --nodeps --force
查看版本：
[root@cdh01 mysql]# mysql -V
mysql Ver 14.14 Distrib 5.7.41, for Linux (x86_64) using EditLine wrapper
6.启动MySQL：systemctl start mysqld
这里网上有说可能会失败，如果失败的话，先初始化一下：mysqld --initialize
如果遇到下面的错误：
2017-01-06T14:53:08.889803Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2017-01-06T14:53:08.892190Z 0 [ERROR] --initialize specified but the data directory has files in it. Aborting.
2017-01-06T14:53:08.892475Z 0 [ERROR] Aborting
可以运行以下命令【无需再执行 mysqld --initialize】：
[root@cdh01 mysql]# rm -rf /var/lib/mysql
[root@cdh01 mysql]# systemctl start mysqld
安装成功后，首先将数据库设置成无密码状态，先恢复配置文件
cp /etc/my.cnf.bak /etc/my.cnf
修改配置
vi /etc/my.cnf
添加 skip-grant-tables 可保证为无密码状态
重启mysql服务器，使配置生效：systemctl restart mysqld
进入数据库，mysql -u root -p 按enter 键进入，使用mysql数据库
修改mysql的登录密码为：123456
update user set authentication_string=password("123456") where user='root';
如果有报错或者后面使用密码登录有下面的报错的话：
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
就执行以下命令：
mysql> set global validate_password_policy =0;
Query OK, 0 rows affected (0.04 sec)
mysql> set global validate_password_length = 6;
Query OK, 0 rows affected (0.00 sec)
mysql> flush privileges;
7.恢复备份的数据
mysql -u root -h xxx -P 3306 -p < databases.sql
