Linux安装mysql数据库

1、在opt目录里面新建两个文件夹

（1）mySoftware：用于存放软件安装包

（2）mysql：安装mysql的文件夹

2、解压mysql安装包：tar -xvf mysql-8.0.26-1.el7.x86_64.rpm-bundle.tar -C /opt/mysql

3、进入mysql目录，依次执行下面命令：

4、启动MySQL服务

（1）systemctl start mysqld：启动mysql服务器

（2）systemctl restart mysqld：重启mysql服务器

（3）systemctl stop mysqld：停止mysql服务器

5、查询自动生成的root用户密码

6、修改root用户密码

登录到MySQL之后，需要将自动生成的不便记忆的密码修改了，修改成自己熟悉的便于记忆的密码。

ALTER USER 'root'@'localhost' IDENTIFIED BY '1234'

7、 默认的root用户只能当前节点localhost访问，是无法远程访问的，我们还需要创建一个root账户，用户远程访问

并给root用户分配权限

grant all on *.* to 'root'@'%'

1.首先在liunx下安装Mysql数据库

~$ sudo apt-get install mysql-server #安装Mysql服务器端

~$ ps -aux|grep mysql #检查Mysql服务器进程

beili10301 0.0 0.0 37080 3604 pts/7S+5月20 0:00 mysql -u root -p

mysql25125 0.0 0.0 4472 1704 ?Ss 09:51 0:00 /bin/sh /usr/bin/mysqld_safe

mysql25496 0.0 3.1 859956 127084 ? Sl 09:51 0:01 /usr/sbin/mysqd --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --log-error=/var/log/mysql/error.log --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/run/mysqld/mysqld.sock --port=3306

beili26652 0.0 0.0 13708 2180 pts/19 S+ 10:32 0:00 grep --color=auto mysql

~$ netstat -nlt|grep 3306 #检查Mysql服务器占用端口

tcp0 0 127.0.0.1:3306 0.0.0.0:* LISTEN

~$ /etc/init.d/mysql status # 通过启动命令检查Mysql服务器状态

Loaded: loaded (/lib/systemd/system/mysql.serviceenabledvendor preset: enabled)

Active: active (running) since 四 2015-05-21 09:51:13 CST43min ago

Process: 25126 ExecStartPost=/usr/share/mysql/mysql-systemd-start post (code=exited, status=0/SUCCESS)

Process: 25122 ExecStartPre=/usr/share/mysql/mysql-systemd-start pre (code=exited, status=0/SUCCESS)

~$ service mysql status # 通过系统服务检查Mysql服务器状态

● mysql.service - MySQL Community Server

Loaded: loaded (/lib/systemd/system/mysql.serviceenabledvendor preset: enabled)

Active: active (running) since 四 2015-05-21 09:51:13 CST44min ago

Process: 25126 ExecStartPost=/usr/share/mysql/mysql-systemd-start post (code=exited, status=0/SUCCESS)

Process: 25122 ExecStartPre=/usr/share/mysql/mysql-systemd-start pre (code=exited, status=0/SUCCESS)

~$ whereis mysql # 查看mysql各个文件安装的目录

mysql: /usr/bin/mysql /usr/lib/mysql /etc/mysql /usr/include/mysql /usr/share/mysql /usr/share/man/man1/mysql.1.gz

2.访问和配置Mysql

$ mysql -u root -p

Enter password:

mysql默认的字符集为latin1的，所以要改为utf8的。很多网上的文章执行“sudo vi /etc/mysql/my.cnf”，可是打开一看，里面就两行话：

!includedir /etc/mysql/conf.d/

!includedir /etc/mysql/mysql.conf.d/

想来mysql的配置文件应该是在那两个文件夹下面，于是尝试之下打开了/etc/mysql/mysql.conf.d/ 下的mysqld.cnf文件，执行下面的命令：

~$ sudo vi /etc/mysql/mysql.conf.d/mysqld.cnf

...

[client]

default-character-set=utf8

[mysqld_safe]

socket = /var/run/mysqld/mysqld.sock

nice= 0

[mysqld]

character-set-server=utf8

collation-server=utf8_general_ci

...

注：棕色部分是添加的内容

重启mysql服务，并查看字符集的设置情况：

~$ sudo /etc/init.d/mysql restart

~$ mysql -u root -p

mysql>show variables like "%char%"

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

| 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/ |

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