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阿里云ecs centos7自带的mysql怎么启动
1、通过rpm包安装的MySQL
service mysqld restart
/etc/inint.d/mysqld start
2、从源码包安装的MySQL
// linux关闭MySQL的命令
$mysql_dir/bin/mysqladmin -uroot -p shutdown
// linux启动MySQL的命令
$mysql_dir/bin/mysqld_safe
其中mysql_dir为MySQL的安装目录,mysqladmin和mysqld_safe位于MySQL安装目录的bin目录下。
3、以上方法都无效的时候,可以通过强行命令:“killall mysqld”来关闭MySQL。
centos7怎样安装mysql服务器
本人博客供参考
网页链接
下载mysql源安装包shell wget
安装mysql源shell yum localinstall mysql57-community-release-el7-8.noarch.rpm
检查mysql源是否安装成功
yum repolist enabled | grep “mysql.-community.”
安装MySQL
yum install mysql-community-server
启动MySQL服务
shell systemctl start mysqld
查看MySQL的启动状态
shell systemctl status mysqld
开机启动
shell systemctl enable mysqld
shell systemctl daemon-reload
修改root本地登录密码
mysql安装完成之后,在/var/log/mysqld.log文件中给root生成了一个默认密码。通过下面的方式找到root默认密码,然后登录mysql进行修改:
shell grep ‘temporary password’ /var/log/mysqld.log
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默认安装了密码安全检查插件(validate_password),默认密码检查策略要求密码必须包含:大小写字母、数字和特殊符号,并且长度不能少于8位。否则会提示ERROR 1819 (HY000): Your password does not satisfy the current policy requirements错误
添加远程登录用户
默认只允许root帐户在本地登录,如果要在其它机器上连接mysql,必须修改root允许远程连接,或者添加一个允许远程连接的帐户,为了安全起见,我添加一个新的帐户:
mysql GRANT ALL PRIVILEGES ON . TO ‘yangxin’@’%’ IDENTIFIED BY ‘Yangxin0917!’ WITH GRANT OPTION;
以上部分个人实践过,以下内容待实践
数据库存emoji 表情问题
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有一个使用限制,mysql版本必须是5.5以上,大家需要注意,我目前用的ubuntu系统是16.04的。当前mysql的字符集配置如上表,我们的目的是更改成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,个别的位置有所不同
/etc/mysql/mysql.conf.d/mysqld.cnf
4.修改配置文件
在原文中添加以下内容:
[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’
原文件中无“[client]”和“[mysql]”,需要手动添加上。
……
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.重启mysql服务
sudo service mysql restart
6.查看结果
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)
如何在centos7中装mysql
运行mysql.server脚本,mysql.server脚本通过调用mysqld_safe启动服务器,该脚本可以通过参数start和stop指定启动还是关闭。mysql.server脚本在MySQL安装目录下的share/mysql目录中,如果是采用源码安装的MySQL,则可以在support-files目录里找到。如果想使用mysql.server,则必须把它复制到合适的运行级别目录中。
如上配置之后,就可以利用以下命令启动和关闭MySQL实例。
执行命令:
service mysqld start就启动了。
centos7的mysql怎么重启
centos7自带是mariadb,一个mysql的变种。查看有没有安装过:yum list installed mysql*rpm -qa | grep mysql*安装mysql软件(mariadb)yum install mysql*启动mysqlsystemctl start mariadb.service 或者 systemctl start mysqld.service结束systemctl stop mariadb.service 或者 systemctl stop mysqld.service重启systemctl restart mariadb.service 或者 systemctl restart mysqld.service开机自启systemctl enable mariadb.service 或者 systemctl enable mysqld.service