从零搭建hadoop集群之mysql安装

Linux RPM 方式安装 MySQL在 hadoop02机器上

1、 安装新版mysql前，需将系统自带的mariadb-lib卸载

[root@hadoop02 ~]# rpm -qa|grep mariadb     #查询系统自带得mariadb-libmariadb-libs-5.5.68-1.el7.x86_64[root@hadoop02 ~]# rpm -e --nodeps mariadb-libs-5.5.68-1.el7.x86_64    #卸载系统自带得mariadb-lib[root@hadoop02 ~]# rpm -qa|grep mariadb     #检查系统自带得mariadb-lib是否已卸载

2. 官网下载5.7版本：https://dev.mysql.com/downloads/mysql/

3.可以使用xftp上传到hadoop02机器得/opt/mysql目录下

4. 解压安装包并

[root@hadoop02 mysql]# tar -xvf mysql-5.7.32-1.el7.x86_64.rpm-bundle.tar
mysql-community-client-5.7.32-1.el7.x86_64.rpm
mysql-community-common-5.7.32-1.el7.x86_64.rpm
mysql-community-devel-5.7.32-1.el7.x86_64.rpm
mysql-community-embedded-5.7.32-1.el7.x86_64.rpm
mysql-community-embedded-compat-5.7.32-1.el7.x86_64.rpm
mysql-community-embedded-devel-5.7.32-1.el7.x86_64.rpm
mysql-community-libs-5.7.32-1.el7.x86_64.rpm
mysql-community-libs-compat-5.7.32-1.el7.x86_64.rpm
mysql-community-server-5.7.32-1.el7.x86_64.rpm
mysql-community-test-5.7.32-1.el7.x86_64.rpm
[root@hadoop02 mysql]# ll
总用量 1060072
-rw-r--r-- 1 root root  542750720 12月 15 14:21 mysql-5.7.32-1.el7.x86_64.rpm-bundle.tar
-rw-r--r-- 1 7155 31415  26460548 9月  25 12:48 mysql-community-client-5.7.32-1.el7.x86_64.rpm
-rw-r--r-- 1 7155 31415    314936 9月  25 12:48 mysql-community-common-5.7.32-1.el7.x86_64.rpm
-rw-r--r-- 1 7155 31415   3918236 9月  25 12:48 mysql-community-devel-5.7.32-1.el7.x86_64.rpm
-rw-r--r-- 1 7155 31415  47479624 9月  25 12:48 mysql-community-embedded-5.7.32-1.el7.x86_64.rpm
-rw-r--r-- 1 7155 31415  23263144 9月  25 12:48 mysql-community-embedded-compat-5.7.32-1.el7.x86_64.rpm
-rw-r--r-- 1 7155 31415 130933732 9月  25 12:48 mysql-community-embedded-devel-5.7.32-1.el7.x86_64.rpm
-rw-r--r-- 1 7155 31415   2457204 9月  25 12:48 mysql-community-libs-5.7.32-1.el7.x86_64.rpm
-rw-r--r-- 1 7155 31415   1260336 9月  25 12:48 mysql-community-libs-compat-5.7.32-1.el7.x86_64.rpm
-rw-r--r-- 1 7155 31415 181712536 9月  25 12:49 mysql-community-server-5.7.32-1.el7.x86_64.rpm
-rw-r--r-- 1 7155 31415 124941892 9月  25 12:49 mysql-community-test-5.7.32-1.el7.x86_64.rpm

为了避免出现权限问题，给mysql解压文件所在目录赋予最大权限

[root@hadoop02 opt]# chmod -R 777 mysql/
[root@hadoop02 opt]# ll
总用量 4
drwxrwxrwx  2 root root 4096 12月 15 14:23 mysql
drwxr-xr-x. 2 root root    6 10月 31 2018 rh

严格按照顺序安装：mysql-community-common-5.7.29-1.el7.x86_64.rpm、mysql-community-libs-5.7.29-1.el7.x86_64.rpm、mysql-community-client-5.7.29-1.el7.x86_64.rpm、mysql-community-server-5.7.29-1.el7.x86_64.rpm这四个包

rpm -ivh mysql-community-common-5.7.32-1.el7.x86_64.rpm
rpm -ivh mysql-community-libs-5.7.32-1.el7.x86_64.rpm
rpm -ivh mysql-community-client-5.7.32-1.el7.x86_64.rpm
rpm -ivh mysql-community-server-5.7.32-1.el7.x86_64.rpm --nodeps --force

5. 配置数据库

vim /etc/my.cnf

添加这三行

skip-grant-tables：跳过登录验证

character_set_server=utf8：设置默认字符集UTF-8

init_connect='SET NAMES utf8'：设置默认字符集UTF-8

6 . 启动mysql服务

[root@hadoop02 mysql]# systemctl start mysqld.service  #设置开机启动
[root@hadoop02 mysql]# mysql    #启动mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.32 MySQL Community Server (GPL)

Copyright (c) 2000, 2020, 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.

mysql>

7. 设置密码和开启远程登录

设置一个简单的密码

mysql> update mysql.user set authentication_string=password('123456') where user='root';
Query OK, 1 row affected, 1 warning (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 1

mysql> flush privileges;  #立即生效
Query OK, 0 rows affected (0.01 sec)

退出mysql并停止mysql服务

mysql> quit;
Bye
[root@hadoop02 mysql]# systemctl stop mysqld.service

编辑/etc/my.cnf配置文件将：skip-grant-tables这一行注释掉 ,并重启mysql服务

[root@hadoop02 mysql]# vim /etc/my.cnf
[root@hadoop02 mysql]# systemctl start mysqld.service

再次登录mysql

[root@hadoop02 mysql]# mysql -uroot -p123456

重新重设密码

ALTER USER USER() IDENTIFIED BY '123456';

如果出现如下错误：

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY '123456';
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

是密码的复杂度不符合默认规定，查看密码得设置策略

mysql> SHOW VARIABLES LIKE 'validate_password%';
+--------------------------------------+-------+
| Variable_name | Value |
+--------------------------------------+-------+
| validate_password_check_user_name | OFF |      
| validate_password_dictionary_file | |       #指定密码验证的文件路径
| validate_password_length | 6 |              #固定密码的总长度；
| validate_password_mixed_case_count | 1 |    # 整个密码中至少要包含大/小写字母的总个数
| validate_password_number_count | 1 |        #整个密码中至少要包含阿拉伯数字的个数
| validate_password_policy | LOW |            #指定密码的强度验证等级，默认为 MEDIUM
| validate_password_special_char_count | 1 |
+--------------------------------------+-------+

设置密码的验证强度等级，设置 validate_password_policy 的全局参数为 LOW

set global validate_password_policy=LOW;  #只验证密码得长度

set global validate_password_length=6;   #密码验证得长度修改成功

开启mysql远程访问

grant all privileges on *.* to 'root'@'%' identified by '123123' with grant option;

by后面的就是远程登录密码，远程登录密码可以和用户密码不一样