按照原文安裝後自己整理,原文地址：http://www.linuxidc.com/Linux/2016-09/135288.htm
賬號：root 密碼：Zhangle123456!
賬號：admin 密碼：Admin123456!
service mysqld stop
service mysqld restart
mysql -uroot -p
默認配置文件路徑：
配置文件：/etc/my.cnf
日誌文件：/var/log//var/log/mysqld.log
服務啓動腳本：/usr/lib/systemd/system/mysqld.service
socket文件：/var/run/mysqld/mysqld.pid
1、配置YUM源
# 官網下載路徑，下載mysql源安裝包shell> wget http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm
# 安裝mysql源
shell> yum localinstall mysql57-community-release-el7-8.noarch.rpm
#檢查mysql源是否安裝成功
shell> yum repolist enabled | grep "mysql.*-community.*"
#出現如下代碼：
mysql-connectors-community/x86_64 MySQL Connectors Community 42
mysql-tools-community/x86_64 MySQL Tools Community 55
mysql57-community/x86_64 MySQL 5.7 Community Server 227
2、安裝MySQL
shell> yum install mysql-community-server
3、啓動MySQL服務
shell> systemctl start mysqld
4、查看MySQL的啓動狀態
shell> systemctl status mysqld
顯示如下：
mysqld.service - MySQL Server
Loaded: loaded (/usr/lib/systemd/system/mysqld.service; disabled; vendor preset: disabled)
Active: active (running) since 五 2016-06-24 04:37:37 CST; 35min ago
Main PID: 2888 (mysqld)CGroup: /system.slice/mysqld.service
└─2888 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid
6月 24 04:37:36 localhost.localdomain systemd[1]: Starting MySQL Server...6月 24 04:37:37 localhost.localdomain systemd[1]: Started MySQL Server.
5、設置開機啓動
shell> systemctl enable mysqld
shell> systemctl daemon-reload
6、修改root本地登錄密碼
mysql安裝完成之後，在/var/log/mysqld.log文件中給root生成了一個默認密碼。
通過下面的方式找到root默認密碼，然後登錄mysql進行修改：
shell> grep 'temporary password' /var/log/mysqld.log
顯示如下：
其中默認密碼爲最後的：CcyrIPRKk5=K
shell> mysql -uroot -p
Enter password: //輸入上面查到的密碼 CcyrIPRKk5=K
出現如下界面：
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.7.21
Copyright (c) 2000, 2018, 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.
#輸入命令：
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'Zhangle123456';
或者
mysql> set password for 'root'@'localhost'=password('Zhangle123456');
注意：mysql5.7默認安裝了密碼安全檢查插件（validate_password），默認密碼檢查策略要求密碼必須包含：大小寫字母、數字和特殊符號，並且長度不能少於8位。否則會提示ERROR 1819 (HY000): Your password does not satisfy the current policy requirements錯誤，
#重新輸入複雜密碼
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'Zhangle123456!';
Query OK, 0 rows affected (0.00 sec)
以下是密碼策略，可跳過：
密碼策略提示
通過msyql環境變量可以查看密碼策略的相關信息：
mysql> show variables like '%password%';
#顯示如下：
+---------------------------------------+--------+
| Variable_name | Value |
+---------------------------------------+--------+
| default_password_lifetime | 0 |
| disconnect_on_expired_password | ON |
| log_builtin_as_identified_by_password | OFF |
| mysql_native_password_proxy_users | OFF |
| old_passwords | 0 |
| report_password | |
| sha256_password_proxy_users | OFF |
| validate_password_check_user_name | OFF |
| validate_password_dictionary_file | |
| validate_password_length | 8 |
| validate_password_mixed_case_count | 1 |
| validate_password_number_count | 1 |
| validate_password_policy | MEDIUM |
| validate_password_special_char_count | 1 |
+---------------------------------------+--------+
14 rows in set (0.04 sec)
validate_password_dictionary_file：密碼策略文件，策略爲STRONG才需要
validate_password_length：密碼最少長度
validate_password_mixed_case_count：大小寫字符長度，至少1個
validate_password_number_count ：數字至少1個
validate_password_policy：密碼策略，默認爲MEDIUM策略
validate_password_special_char_count：特殊字符至少1個
上述參數是默認策略MEDIUM的密碼檢查規則。
共有以下幾種密碼策略：
策略 檢查規則0 or LOW Length
1 or MEDIUM Length; numeric, lowercase/uppercase, and special characters
2 or STRONG Length; numeric, lowercase/uppercase, and special characters; dictionary file
MySQL官網密碼策略詳細說明：http://dev.mysql.com/doc/refman/5.7/en/validate-password-options-variables.html#sysvar_validate_password_policy
修改密碼策略
在/etc/my.cnf文件添加validate_password_policy配置，指定密碼策略
# 選擇0（LOW），1（MEDIUM），2（STRONG）其中一種，選擇2需要提供密碼字典文件
validate_password_policy=0
如果不需要密碼策略，添加my.cnf文件中添加如下配置禁用即可：
validate_password = off
重新啓動mysql服務使配置生效：
systemctl restart mysqld
7、添加遠程登錄用戶
默認只允許root帳戶在本地登錄，如果要在其它機器上連接mysql，必須修改root允許遠程連接，或者添加一個允許遠程連接的帳戶，爲了安全起見，我添加一個新的帳戶：
mysql> GRANT ALL PRIVILEGES ON *.* TO admin'@'%' IDENTIFIED BY 'Admin123456!' WITH GRANT OPTION;
8、配置默認編碼爲utf8
修改/etc/my.cnf配置文件
vim /etc/my.cnf
在[mysqld]下添加編碼配置，如下所示：
[mysqld]
character_set_server=utf8
init_connect='SET NAMES utf8'
重新啓動mysql服務，
systemctl restart mysqld
登錄數據庫
mysql -uroot -p
輸入密碼 //更改後的新密碼
查看默認編碼如下所示：
mysql>show variables like '%characters%';
顯示如下：
+--------------------------+----------------------------+
| Variable_name | Value |
+--------------------------+----------------------------+
| character_set_client | utf8 |
| character_set_connection | utf8 |
| character_set_database | utf8 |
| character_set_filesystem | binary |
| character_set_results | utf8 |
| character_set_server | utf8 |
| character_set_system | utf8 |
| character_sets_dir | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
-------end-------
按照原文安裝後自己整理,原文地址：http://www.linuxidc.com/Linux/2016-09/135288.htm