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centos7源码mysql的简单介绍

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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