md/ubuntu-mysql5.7.md

切换目录
```
cd /usr/local
```

浏览器打开 https://dev.mysql.com/downloads/mysql/5.7.html#downloads 选择配置然后下载

- Archives
- 5.7.44
- Linux - Generic
- 64-bit
- Compressed TAR Archive

浏览器建立下载任务后，复制下载链接，回到命令行通过命令下载解压

```
wget 下载链接
```
```
tar -zvxf mysql-5.7.44-linux-glibc2.12-x86_64.tar.gz
```
```
mv mysql-5.7.44-linux-glibc2.12-x86_64 /usr/local/mysql
```
```
cd /usr/local/mysql
```

创建必要的目录

```
mkdir data
```
```
mkdir tmp
```
```
mkdir run
```
```
mkdir log
```

创建必要的文件
```
cd run
```
```
touch mysql.sock
```
```
touch mysql.pid
```

编辑配置文件
```
vim /etc/my.cnf
```

复制粘贴以下内容
```
[client]
port = 24100
socket = /usr/local/mysql/run/mysql.sock
[mysqld]
user = root
server-id = 1
port = 24100
basedir = /usr/local/mysql
datadir = /usr/local/mysql/data
tmpdir  = /usr/local/mysql/tmp
socket = /usr/local/mysql/run/mysql.sock
pid-file = /usr/local/mysql/run/mysql.pid
character-set-server = utf8mb4
collation-server = utf8mb4_general_ci
init_connect='SET NAMES utf8mb4'
lower_case_table_names = 1
max_connections = 400
max_connect_errors = 1000
explicit_defaults_for_timestamp = true
max_allowed_packet = 128M
interactive_timeout = 1800
wait_timeout = 1800
tmp_table_size = 16M
max_heap_table_size = 128M
query_cache_size = 0
query_cache_type = 0
read_buffer_size = 2M
read_rnd_buffer_size = 8M
sort_buffer_size = 8M
binlog_cache_size = 1M
back_log = 130
log_error = /usr/local/mysql/log/error.log
slow_query_log = 1
long_query_time = 5
slow_query_log_file = /usr/local/mysql/log/slow.log
log_throttle_queries_not_using_indexes = 0
min_examined_row_limit = 100
expire_logs_days = 5
log-bin = mysql-bin
binlog_format = ROW
binlog_row_image = minimal
innodb_open_files = 300
innodb_buffer_pool_size = 512M
innodb_log_buffer_size = 2M
innodb_flush_method = O_DIRECT
innodb_write_io_threads = 4
innodb_read_io_threads = 4
innodb_lock_wait_timeout = 60
innodb_log_file_size = 32M
sql_mode=STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION,NO_ZERO_IN_DATE,NO_ZERO_DATE
```

初始化mysql
```
cd /usr/local/mysql/bin
```
```
./mysqld --defaults-file=/etc/my.cnf --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --user=root --initialize
```

查看默认密码
```
cat /usr/local/mysql/log/error.log
```

找到这一行，截图或者复制粘贴出来等下要用
```
[Note] A temporary password is generated for root@localhost: xxxxxx
```

运行mysql
```
cd /usr/local/mysql/support-files
```
```
./mysql.server start
```

命令行连接mysql
```
cd /usr/local/mysql/bin
```

密码是前面看到的默认密码
```
./mysql -u root -p
```

修改root账号的默认密码

```
SET PASSWORD = PASSWORD('填写明文密码');
```
```
ALTER USER 'root'@'localhost' PASSWORD EXPIRE NEVER;
```

刷新
```
FLUSH PRIVILEGES;
```

添加用户
```
CREATE USER '用户名'@'%' IDENTIFIED BY '填写明文密码';
```

建库
```
CREATE DATABASE `库名`;
```

授权（不要忘记刷新）
```
GRANT ALL ON 库名.* TO '用户名'@'%';
```