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+# MySQL部署
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+
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+### 环境
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+
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+1. Ubuntu 18.04
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+2. MySQL 8.0.16
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+
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+### 安装MySQL
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+
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+1. 从官网下载mysql-apt-config.deb安装配置包
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+
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+ https://dev.mysql.com/downloads/repo/apt/
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+
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+ 如： mysql-apt-config_0.8.13-1_all.deb
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+
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+2. 开始安装
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+
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+ ```shell
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+ dpkg -i mysql-apt-config_0.8.13-1_all.deb
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+ ```
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+
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+ 选择MySQL8，OK
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+
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+ ```
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+ apt update
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+ apt install mysql-server
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+ ```
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+
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+ 输入root密码，加密方式选择Legacy Authentication Method
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+
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+3. 验证安装是否成功
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+
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+ ```shell
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+ service mysql status
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+ mysql -u root -p
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+ ```
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+
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+4. 查看mysql字符集
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+
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+ ```shell
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+ mysql> show variables like '%char%';
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+ ```
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+
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+5. 设置 mysql 数据库表大小写不敏感
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+
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+ mysql 在Windows下不区分大小写，但是在Linux下默认是区分大小写的
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+
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+ 查看当前配置（区分大小写）
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+
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+ ```shell
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+ mysql> show variables like '%case%';
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+ ```
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+
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+ | Variable_name | Value | 说明 |
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+ | ---------------------- | ----- | ------------------------------------------------------------ |
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+ | lower_case_file_system | OFF | 表示当前系统文件是否大小写敏感，只读参数，无法修改 |
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+ | lower_case_table_names | 0 | 表示表名是否大小写敏感，可以修改<br />lower_case_table_names = 0时，mysql会根据表名直接操作，大小写敏感。<br />lower_case_table_names = 1时，mysql会先把表名转为小写，再执行操作。 |
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+
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+ mysql8 如果数据库已经初始化则已经不能通过修改配置文件使大小写不敏感了，只能清空数据库文件，然后修改配置文件，再初始化数据库，才能生效
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+
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+ 1. 清空数据库文件
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+
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+ ```shell
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+ rm -r /var/lib/mysql
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+ ```
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+
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+ 2. 修改配置文件
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+
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+ ```shell
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+ vi /etc/mysql/mysql.conf.d/mysqld.cnf
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+ ```
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+
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+ 末尾添加 lower_case_table_names=1
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+
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+ 3. 初始化数据库
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+
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+ ```shell
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+ mysqld --initialize
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+ # 然后授权数据库数据给mysql用户
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+ chown -R mysql:mysql /var/lib/mysql
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+ ```
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+
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+ 4. 登陆数据库，修改root密码，临时密码在日志文件里面找 /var/log/mysql/error.log
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+
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+ ```shell
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+ mysql -u root -p
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+ mysql>ALTER USER "root"@"localhost" IDENTIFIED BY "XCH666xch!";
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+ ```
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+
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+6. mysql数据库最大连接数修改
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+
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+ 1. 查看当前连接数
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+
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+ ```shell
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+ mysql -uroot -pXCH666xch! -e 'show status' | grep -i Threads
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+ ```
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+
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+ Threads_running 2 表示当前连接数为2
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+
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+ 2. 查看最大连接数
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+
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+ ```shell
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+ mysql -uroot -pXCH666xch! -e 'show variables' | grep max_connections
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+ ```
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+
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+ 3. 临时修改最大连接数，服务重启会失效
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+
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+ ```shell
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+ mysql> set GLOBAL max_connections=300
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+ ```
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+
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+ 4. 永久修改
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+
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+ ```shell
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+ vi /etc/mysql/mysql.conf.d/mysqld.cnf
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+ # 末尾添加 max_connections=500
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+ # 重启mysql服务
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+ ```
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+
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+7. mysql远程访问
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+
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+ ```shell
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+ mysql> use mysql;
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+ mysql> select user,host from user;
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+ ```
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+
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+ 看到root用户只允许localhost（即本地）访问，修改为 % ，%表示所有机器（临时处理）
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+
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+ ```shell
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+ mysql> update user set host='%' where user='root';
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+ ```
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+
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+ 重启mysql服务
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+
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+ ```shell
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+ service mysql restart
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+ ```
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+
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+
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hatim