系統版本：CentOS-7-x86_64-DVD-1503-01.iso 安裝後不要升級！！！(我試過升級後安裝MySQL不能啟動）

網路環境：虛擬機器橋接，可以連線外網：

安裝方式：手動網路安裝---倉庫的方式

需要的檔案：如下圖。PDF檔案為官方指導檔案。

1.將mysql57-community-release-el7-7.noarch.rpm檔案置於CentOS的Root家目錄：

[[email protected] ~]# ll

總用量 16

-rw-------. 1 root root 1665 11月  7 10:49 anaconda-ks.cfg

-rw-r--r--. 1 root root 8984 11月  7 11:13mysql57-community-release-el7-7.noarch.rpm

2.開始安裝：按照提示一步步安裝即可

[[email protected] ~]# rpm -ivhmysql57-community-release-el7-7.noarch.rpm

[[email protected] ~]# yum installmysql-community-server

3.檢視支援當前系統的可以安裝MySQL的其他元件：

[[email protected] ~]# yum --disablerepo=\*--enablerepo='mysql*-community*' list available

4.檢視安裝後的MySQL的服務是否已經啟動：

[[email protected] ~]# service mysqld status

Redirecting to /bin/systemctl status  mysqld.service

mysqld.service - MySQL Server

  Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled)

  Active: inactive (dead)

5.沒有啟動，則啟動MySQL服務：

[[email protected] ~]# service mysqld start

Redirecting to /bin/systemctl start  mysqld.service

檢查是否正常啟動，

[[email protected] ~]# service mysqld status

Redirecting to /bin/systemctl status  mysqld.service

mysqld.service - MySQL Server

  Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled)

   Active:active (running) since 六 2015-11-0711:24:02 CST; 14s ago

 Process: 3157 ExecStart=/usr/sbin/mysqld --daemonize $MYSQLD_OPTS(code=exited, status=0/SUCCESS)

6.檢視安裝MySQL後自動產生的隨機Root密碼：

此Root密碼是資料庫的不是CentOS系統的

[[email protected] ~]# grep 'temporary password'/var/log/mysqld.log

2015-11-07T03:23:44.719982Z 1 [Note] Atemporary password is generated for [email protected]: JfHhiPk,n2Pw

7.用隨機密碼登入MySQL並修改Root密碼：

[[email protected] ~]# mysql -u root-pJfHhiPk,n2Pw

mysql> use mysql

ERROR 1820 (HY000): You must reset yourpassword using ALTER USER statement before executing this statement.

密碼必須滿足複雜性的策略

mysql> SET PASSWORD FOR'root'@'localhost'= "pw57mysql";

ERROR 1819 (HY000): Your password does notsatisfy the current policy requirements

mysql> SET PASSWORD FOR'root'@'localhost'= "PW57-mysql";

Query OK, 0 rows affected (0.00 sec)

mysql> exit

Bye

8.用新的密碼登入，修改MySQL表支援非本機連線：

[[email protected] ~]# mysql -u root -pPW57-mysql

mysql> usemysql

Reading table information for completion oftable and column names

You can turn off this feature to get aquicker startup with -A

Database changed

mysql> selecthost, user from user;     -----修改前

+-----------+-----------+

| host     | user      |

+-----------+-----------+

| localhost | mysql.sys |

| localhost | root      |

+-----------+-----------+

2 rows in set (0.00 sec)

mysql> update userset host = '%' where user = 'root';   ---修改

Query OK, 1 row affected (0.00 sec)

Rows matched: 1  Changed: 1 Warnings: 0

mysql> selecthost, user from user;     -----修改後

+-----------+-----------+

| host     | user      |

+-----------+-----------+

| %        | root      |

| localhost | mysql.sys |

+-----------+-----------+

2 rows in set (0.00 sec)

mysql> flushprivileges;     ------重新整理，讓修改立即生效！

Query OK, 0 rows affected (0.00 sec)

mysql>

Bye

9.檢查CentOS的防火牆設定：

因為發現其他機器可以ping通，連資料庫卻不通。

[[email protected] ~]# service iptables status

Redirecting to /bin/systemctl status  iptables.service

iptables.service

  Loaded: not-found (Reason: No such file or directory)       ------CentOS7好像不用iptables這玩意了

  Active: inactive (dead)

[[email protected] ~]# servicefirewalld status

Redirecting to /bin/systemctl status  firewalld.service

firewalld.service - firewalld - dynamicfirewall daemon

  Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled)

   Active:active (running) since 六 2015-11-0711:11:43 CST; 38min ago     ----看到是執行狀態

 MainPID: 624 (firewalld)

  CGroup: /system.slice/firewalld.service

          └─624 /usr/bin/python-Es /usr/sbin/firewalld --nofork --nopid

11月 07 11:11:43 MySQL systemd[1]: Started firewalld - dynamic firewalldaemon.

[[email protected] ~]# servicefirewalld stop

Redirecting to /bin/systemctl stop  firewalld.service

[[email protected] ~]# service firewalld status

Redirecting to /bin/systemctl status  firewalld.service

firewalld.service - firewalld - dynamicfirewall daemon

  Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled)

   Active:inactive (dead) since 六 2015-11-0711:53:03 CST; 3s ago

 MainPID: 624 (code=exited, status=0/SUCCESS)

11月 07 11:11:43 MySQL systemd[1]: Started firewalld - dynamic firewalldaemon.

11月 07 11:53:02 MySQL systemd[1]: Stopping firewalld - dynamic firewalldaemon...

11月 07 11:53:03 MySQL systemd[1]: Stopped firewalld - dynamic firewalldaemon.

[[email protected] ~]# chkconfig --list |grepmysql

注意：該輸出結果只顯示 SysV 服務，並不包含原生 systemd 服務。SysV 配置資料可能被原生 systemd 配置覆蓋。

     如果您想列出 systemd 服務,請執行 'systemctllist-unit-files'。

     欲檢視對特定 target 啟用的服務請執行

     'systemctl list-dependencies [target]'。

10.檢視MySQL服務是否啟用（開機自動啟動）：

[[email protected] ~]# systemctl list-unit-files|grep mysql

mysqld.service                              enabled

[[email protected] ~]#

11.防火牆：永久關閉：

我是測試環境，為了偷懶懶得再去設定它，直接關閉。否則重啟後外面又不能連線了。

當然正是環境開始要開的，並且配置外部可以連進來。

[[email protected] ~]# systemctldisable firewalld.service

rm'/etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service'

rm '/etc/systemd/system/basic.target.wants/firewalld.service'

12.MySQL的連線工具：HeidiSQL的連線方式：

13.MySQL官方的workbench的連線方式：