centos7mysql啟動腳本
❶ centos7怎樣安裝mysql伺服器
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下載mysql源安裝包shell> wgethttp://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
yum repolist enabled | grep 「mysql.-community.」
shell> mysql -uroot -p
mysql> ALTER USER 『root』@』localhost』 IDENTIFIED BY 『MyNewPass4!』;
或者:
mysql> set password for 『root』@』localhost』=password(『MyNewPass4!』);
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
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，為了安全起見，我添加一個新的帳戶：
mysql> GRANT ALL PRIVILEGES ON.TO 『yangxin』@』%』 IDENTIFIED BY 『Yangxin0917!』 WITH GRANT OPTION;
以上部分個人實踐過，以下內容待實踐
資料庫存emoji 表情問題
mysql> SHOW VARIABLES WHERE Variable_name LIKE 『character_set_%』 OR Variable_name LIKE 『collation%』;
+————————–+——————-+
| Variable_name | Value |
+————————–+——————-+
| character_set_client | utf8 |
| character_set_connection | utf8 |
| character_set_database | latin1 |
| character_set_filesystem | binary |
| character_set_results | utf8 |
| character_set_server | latin1 |
| character_set_system | utf8 |
| collation_connection | utf8_general_ci |
| collation_database | latin1_swedish_ci |
| collation_server | latin1_swedish_ci |
+————————–+——————-+
10 rows in set (0.02 sec)
可以看到我的mysql版本是5.7的，utf8mb4有一個使用限制，mysql版本必須是5.5以上，大家需要注意，我目前用的ubuntu系統是16.04的。當前mysql的字元集配置如上表，我們的目的是更改成utf8mb4。
3.找到mysql的配置文件，可用命令
sudo find / -name my.cnf
我的配置文件位置如下，個別的位置有所不同
/etc/mysql/mysql.conf.d/mysqld.cnf
4.修改配置文件
在原文中添加以下內容：
[client]
default-character-set = utf8mb4
[mysql]
default-character-set = utf8mb4
[mysqld]
character-set-client-handshake = FALSE
character-set-server = utf8mb4
collation-server = utf8mb4_unicode_ci
init_connect=』SET NAMES utf8mb4』
原文件中無「[client]」和「[mysql]」，需要手動添加上。
……
Here is entries for some specific programs
The following values assume you have at least 32M ram
[client]
default-character-set = utf8mb4
[mysql]
default-character-set = utf8mb4
[mysqld_safe]
socket = /var/run/mysqld/mysqld.sock
nice = 0
[mysqld]
#
* Basic Settings
#
user = mysql
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
port = 3306
basedir = /usr
datadir = /var/lib/mysql
tmpdir = /tmp
lc-messages-dir = /usr/share/mysql
skip-external-locking
character-set-client-handshake = FALSE
character-set-server = utf8mb4
collation-server = utf8mb4_unicode_ci
init_connect=』SET NAMES utf8mb4』
#
Instead of skip-networking the default is now to listen only on
……
5.重啟mysql服務
sudo service mysql restart
6.查看結果
mysql> SHOW VARIABLES WHERE Variable_name LIKE 『character_set_%』 OR Variable_name LIKE 『collation%』;
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect…
Connection id: 3
Current database:* NONE *
+————————–+——————–+
| Variable_name | Value |
+————————–+——————–+
| character_set_client | utf8mb4 |
| character_set_connection | utf8mb4 |
| character_set_database | utf8mb4 |
| character_set_filesystem | binary |
| character_set_results | utf8mb4 |
| character_set_server | utf8mb4 |
| character_set_system | utf8 |
| collation_connection | utf8mb4_unicode_ci |
| collation_database | utf8mb4_unicode_ci |
| collation_server | utf8mb4_unicode_ci |
+————————–+——————–+
10 rows in set (0.00 sec)